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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";

import "./interfaces/IMarketLiquidityRewards.sol";

import "./interfaces/IMarketRegistry.sol";
import "./interfaces/ICollateralManager.sol";
import "./interfaces/ITellerV2.sol";

import { BidState } from "./TellerV2Storage.sol";

// Libraries
import { MathUpgradeable } from "@openzeppelin/contracts-upgradeable/utils/math/MathUpgradeable.sol";

import "@openzeppelin/contracts-upgradeable/token/ERC20/extensions/IERC20MetadataUpgradeable.sol";

/*
- Allocate and claim rewards for loans based on bidId  

- Anyone can allocate rewards and an allocation has specific parameters that can be set to incentivise certain types of loans
 
*/

contract MarketLiquidityRewards is IMarketLiquidityRewards, Initializable {
    address immutable tellerV2;
    address immutable marketRegistry;
    address immutable collateralManager;

    uint256 allocationCount;

    //allocationId => rewardAllocation
    mapping(uint256 => RewardAllocation) public allocatedRewards;

    //bidId => allocationId => rewardWasClaimed
    mapping(uint256 => mapping(uint256 => bool)) public rewardClaimedForBid;

    modifier onlyMarketOwner(uint256 _marketId) {
        require(
            msg.sender ==
                IMarketRegistry(marketRegistry).getMarketOwner(_marketId),
            "Only market owner can call this function."
        );
        _;
    }

    event CreatedAllocation(
        uint256 allocationId,
        address allocator,
        uint256 marketId
    );

    event UpdatedAllocation(uint256 allocationId);

    event IncreasedAllocation(uint256 allocationId, uint256 amount);

    event DecreasedAllocation(uint256 allocationId, uint256 amount);

    event DeletedAllocation(uint256 allocationId);

    event ClaimedRewards(
        uint256 allocationId,
        uint256 bidId,
        address recipient,
        uint256 amount
    );

    constructor(
        address _tellerV2,
        address _marketRegistry,
        address _collateralManager
    ) {
        tellerV2 = _tellerV2;
        marketRegistry = _marketRegistry;
        collateralManager = _collateralManager;
    }

    function initialize() external initializer {}

    /**
     * @notice Creates a new token allocation and transfers the token amount into escrow in this contract
     * @param _allocation - The RewardAllocation struct data to create
     * @return allocationId_
     */
    function allocateRewards(RewardAllocation calldata _allocation)
        public
        virtual
        returns (uint256 allocationId_)
    {
        allocationId_ = allocationCount++;

        require(
            _allocation.allocator == msg.sender,
            "Invalid allocator address"
        );

        require(
            _allocation.requiredPrincipalTokenAddress != address(0),
            "Invalid required principal token address"
        );

        IERC20Upgradeable(_allocation.rewardTokenAddress).transferFrom(
            msg.sender,
            address(this),
            _allocation.rewardTokenAmount
        );

        allocatedRewards[allocationId_] = _allocation;

        emit CreatedAllocation(
            allocationId_,
            _allocation.allocator,
            _allocation.marketId
        );
    }

    /**
     * @notice Allows the allocator to update properties of an allocation
     * @param _allocationId - The id for the allocation
     * @param _minimumCollateralPerPrincipalAmount - The required collateralization ratio
     * @param _rewardPerLoanPrincipalAmount - The reward to give per principal amount
     * @param _bidStartTimeMin - The block timestamp that loans must have been accepted after to claim rewards
     * @param _bidStartTimeMax - The block timestamp that loans must have been accepted before to claim rewards
     */
    function updateAllocation(
        uint256 _allocationId,
        uint256 _minimumCollateralPerPrincipalAmount,
        uint256 _rewardPerLoanPrincipalAmount,
        uint32 _bidStartTimeMin,
        uint32 _bidStartTimeMax
    ) public virtual {
        RewardAllocation storage allocation = allocatedRewards[_allocationId];

        require(
            msg.sender == allocation.allocator,
            "Only the allocator can update allocation rewards."
        );

        allocation
            .minimumCollateralPerPrincipalAmount = _minimumCollateralPerPrincipalAmount;
        allocation.rewardPerLoanPrincipalAmount = _rewardPerLoanPrincipalAmount;
        allocation.bidStartTimeMin = _bidStartTimeMin;
        allocation.bidStartTimeMax = _bidStartTimeMax;

        emit UpdatedAllocation(_allocationId);
    }

    /**
     * @notice Allows anyone to add tokens to an allocation
     * @param _allocationId - The id for the allocation
     * @param _tokenAmount - The amount of tokens to add
     */
    function increaseAllocationAmount(
        uint256 _allocationId,
        uint256 _tokenAmount
    ) public virtual {
        IERC20Upgradeable(allocatedRewards[_allocationId].rewardTokenAddress)
            .transferFrom(msg.sender, address(this), _tokenAmount);
        allocatedRewards[_allocationId].rewardTokenAmount += _tokenAmount;

        emit IncreasedAllocation(_allocationId, _tokenAmount);
    }

    /**
     * @notice Allows the allocator to withdraw some or all of the funds within an allocation
     * @param _allocationId - The id for the allocation
     * @param _tokenAmount - The amount of tokens to withdraw
     */
    function deallocateRewards(uint256 _allocationId, uint256 _tokenAmount)
        public
        virtual
    {
        require(
            msg.sender == allocatedRewards[_allocationId].allocator,
            "Only the allocator can deallocate rewards."
        );

        //enforce that the token amount withdraw must be LEQ to the reward amount for this allocation
        if (_tokenAmount > allocatedRewards[_allocationId].rewardTokenAmount) {
            _tokenAmount = allocatedRewards[_allocationId].rewardTokenAmount;
        }

        //subtract amount reward before transfer
        _decrementAllocatedAmount(_allocationId, _tokenAmount);

        IERC20Upgradeable(allocatedRewards[_allocationId].rewardTokenAddress)
            .transfer(msg.sender, _tokenAmount);

        //if the allocated rewards are drained completely, delete the storage slot for it
        if (allocatedRewards[_allocationId].rewardTokenAmount == 0) {
            delete allocatedRewards[_allocationId];

            emit DeletedAllocation(_allocationId);
        } else {
            emit DecreasedAllocation(_allocationId, _tokenAmount);
        }
    }

    struct LoanSummary {
        address borrower;
        address lender;
        uint256 marketId;
        address principalTokenAddress;
        uint256 principalAmount;
        uint32 acceptedTimestamp;
        uint32 lastRepaidTimestamp;
        BidState bidState;
    }

    function _getLoanSummary(uint256 _bidId)
        internal
        returns (LoanSummary memory _summary)
    {
        (
            _summary.borrower,
            _summary.lender,
            _summary.marketId,
            _summary.principalTokenAddress,
            _summary.principalAmount,
            _summary.acceptedTimestamp,
            _summary.lastRepaidTimestamp,
            _summary.bidState
        ) = ITellerV2(tellerV2).getLoanSummary(_bidId);
    }

    /**
     * @notice Allows a borrower or lender to withdraw the allocated ERC20 reward for their loan
     * @param _allocationId - The id for the reward allocation
     * @param _bidId - The id for the loan. Each loan only grants one reward per allocation.
     */
    function claimRewards(uint256 _allocationId, uint256 _bidId)
        external
        virtual
    {
        RewardAllocation storage allocatedReward = allocatedRewards[
            _allocationId
        ];

        //set a flag that this reward was claimed for this bid to defend against re-entrancy
        require(
            !rewardClaimedForBid[_bidId][_allocationId],
            "reward already claimed"
        );
        rewardClaimedForBid[_bidId][_allocationId] = true;

        //make this a struct ?
        LoanSummary memory loanSummary = _getLoanSummary(_bidId); //ITellerV2(tellerV2).getLoanSummary(_bidId);

        address collateralTokenAddress = allocatedReward
            .requiredCollateralTokenAddress;

        //require that the loan was started in the correct timeframe
        _verifyLoanStartTime(
            loanSummary.acceptedTimestamp,
            allocatedReward.bidStartTimeMin,
            allocatedReward.bidStartTimeMax
        );

        //if a collateral token address is set on the allocation, verify that the bid has enough collateral ratio
        if (collateralTokenAddress != address(0)) {
            uint256 collateralAmount = ICollateralManager(collateralManager)
                .getCollateralAmount(_bidId, collateralTokenAddress);

            //require collateral amount
            _verifyCollateralAmount(
                collateralTokenAddress,
                collateralAmount,
                loanSummary.principalTokenAddress,
                loanSummary.principalAmount,
                allocatedReward.minimumCollateralPerPrincipalAmount
            );
        }

        require(
            loanSummary.principalTokenAddress ==
                allocatedReward.requiredPrincipalTokenAddress,
            "Principal token address mismatch for allocation"
        );

        require(
            loanSummary.marketId == allocatedRewards[_allocationId].marketId,
            "MarketId mismatch for allocation"
        );

        uint256 principalTokenDecimals = IERC20MetadataUpgradeable(
            loanSummary.principalTokenAddress
        ).decimals();

        address rewardRecipient = _verifyAndReturnRewardRecipient(
            allocatedReward.allocationStrategy,
            loanSummary.bidState,
            loanSummary.borrower,
            loanSummary.lender
        );

        uint32 loanDuration = loanSummary.lastRepaidTimestamp -
            loanSummary.acceptedTimestamp;

        uint256 amountToReward = _calculateRewardAmount(
            loanSummary.principalAmount,
            loanDuration,
            principalTokenDecimals,
            allocatedReward.rewardPerLoanPrincipalAmount
        );

        if (amountToReward > allocatedReward.rewardTokenAmount) {
            amountToReward = allocatedReward.rewardTokenAmount;
        }

        require(amountToReward > 0, "Nothing to claim.");

        _decrementAllocatedAmount(_allocationId, amountToReward);

        //transfer tokens reward to the msgsender
        IERC20Upgradeable(allocatedRewards[_allocationId].rewardTokenAddress)
            .transfer(rewardRecipient, amountToReward);

        emit ClaimedRewards(
            _allocationId,
            _bidId,
            rewardRecipient,
            amountToReward
        );
    }

    /**
     * @notice Verifies that the bid state is appropriate for claiming rewards based on the allocation strategy and then returns the address of the reward recipient(borrower or lender)
     * @param _strategy - The strategy for the reward allocation.
     * @param _bidState - The bid state of the loan.
     * @param _borrower - The borrower of the loan.
     * @param _lender - The lender of the loan.
     * @return rewardRecipient_ The address that will receive the rewards. Either the borrower or lender.
     */
    function _verifyAndReturnRewardRecipient(
        AllocationStrategy _strategy,
        BidState _bidState,
        address _borrower,
        address _lender
    ) internal virtual returns (address rewardRecipient_) {
        if (_strategy == AllocationStrategy.BORROWER) {
            require(_bidState == BidState.PAID, "Invalid bid state for loan.");

            rewardRecipient_ = _borrower;
        } else if (_strategy == AllocationStrategy.LENDER) {
            //Loan must have been accepted in the past
            require(
                _bidState >= BidState.ACCEPTED,
                "Invalid bid state for loan."
            );

            rewardRecipient_ = _lender;
        } else {
            revert("Unknown allocation strategy");
        }
    }

    /**
     * @notice Decrements the amount allocated to keep track of tokens in escrow
     * @param _allocationId - The id for the allocation to decrement
     * @param _amount - The amount of ERC20 to decrement
     */
    function _decrementAllocatedAmount(uint256 _allocationId, uint256 _amount)
        internal
    {
        allocatedRewards[_allocationId].rewardTokenAmount -= _amount;
    }

    /**
     * @notice Calculates the reward to claim for the allocation
     * @param _loanPrincipal - The amount of principal for the loan for which to reward
     * @param _loanDuration - The duration of the loan in seconds
     * @param _principalTokenDecimals - The number of decimals of the principal token
     * @param _rewardPerLoanPrincipalAmount - The amount of reward per loan principal amount, expanded by the principal token decimals
     * @return The amount of ERC20 to reward
     */
    function _calculateRewardAmount(
        uint256 _loanPrincipal,
        uint256 _loanDuration,
        uint256 _principalTokenDecimals,
        uint256 _rewardPerLoanPrincipalAmount
    ) internal view returns (uint256) {
        uint256 rewardPerYear = MathUpgradeable.mulDiv(
            _loanPrincipal,
            _rewardPerLoanPrincipalAmount, //expanded by principal token decimals
            10**_principalTokenDecimals
        );

        return MathUpgradeable.mulDiv(rewardPerYear, _loanDuration, 365 days);
    }

    /**
     * @notice Verifies that the collateral ratio for the loan was sufficient based on _minimumCollateralPerPrincipalAmount of the allocation
     * @param _collateralTokenAddress - The contract address for the collateral token
     * @param _collateralAmount - The number of decimals of the collateral token
     * @param _principalTokenAddress - The contract address for the principal token
     * @param _principalAmount - The number of decimals of the principal token
     * @param _minimumCollateralPerPrincipalAmount - The amount of collateral required per principal amount. Expanded by the principal token decimals and collateral token decimals.
     */
    function _verifyCollateralAmount(
        address _collateralTokenAddress,
        uint256 _collateralAmount,
        address _principalTokenAddress,
        uint256 _principalAmount,
        uint256 _minimumCollateralPerPrincipalAmount
    ) internal virtual {
        uint256 principalTokenDecimals = IERC20MetadataUpgradeable(
            _principalTokenAddress
        ).decimals();

        uint256 collateralTokenDecimals = IERC20MetadataUpgradeable(
            _collateralTokenAddress
        ).decimals();

        uint256 minCollateral = _requiredCollateralAmount(
            _principalAmount,
            principalTokenDecimals,
            collateralTokenDecimals,
            _minimumCollateralPerPrincipalAmount
        );

        require(
            _collateralAmount >= minCollateral,
            "Loan does not meet minimum collateralization ratio."
        );
    }

    /**
     * @notice Calculates the minimum amount of collateral the loan requires based on principal amount
     * @param _principalAmount - The number of decimals of the principal token
     * @param _principalTokenDecimals - The number of decimals of the principal token
     * @param _collateralTokenDecimals - The number of decimals of the collateral token
     * @param _minimumCollateralPerPrincipalAmount - The amount of collateral required per principal amount. Expanded by the principal token decimals and collateral token decimals.
     */
    function _requiredCollateralAmount(
        uint256 _principalAmount,
        uint256 _principalTokenDecimals,
        uint256 _collateralTokenDecimals,
        uint256 _minimumCollateralPerPrincipalAmount
    ) internal view virtual returns (uint256) {
        return
            MathUpgradeable.mulDiv(
                _principalAmount,
                _minimumCollateralPerPrincipalAmount, //expanded by principal token decimals and collateral token decimals
                10**(_principalTokenDecimals + _collateralTokenDecimals)
            );
    }

    /**
     * @notice Verifies that the loan start time is within the bounds set by the allocation requirements
     * @param _loanStartTime - The timestamp when the loan was accepted
     * @param _minStartTime - The minimum time required, after which the loan must have been accepted
     * @param _maxStartTime - The maximum time required, before which the loan must have been accepted
     */
    function _verifyLoanStartTime(
        uint32 _loanStartTime,
        uint32 _minStartTime,
        uint32 _maxStartTime
    ) internal virtual {
        require(
            _minStartTime == 0 || _loanStartTime > _minStartTime,
            "Loan was accepted before the min start time."
        );
        require(
            _maxStartTime == 0 || _loanStartTime < _maxStartTime,
            "Loan was accepted after the max start time."
        );
    }

    /**
     * @notice Returns the amount of reward tokens remaining in the allocation
     * @param _allocationId - The id for the allocation
     */
    function getRewardTokenAmount(uint256 _allocationId)
        public
        view
        override
        returns (uint256)
    {
        return allocatedRewards[_allocationId].rewardTokenAmount;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.1) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/AddressUpgradeable.sol";

/**
 * @dev This is a base contract to aid in writing upgradeable contracts, or any kind of contract that will be deployed
 * behind a proxy. Since proxied contracts do not make use of a constructor, it's common to move constructor logic to an
 * external initializer function, usually called `initialize`. It then becomes necessary to protect this initializer
 * function so it can only be called once. The {initializer} modifier provided by this contract will have this effect.
 *
 * The initialization functions use a version number. Once a version number is used, it is consumed and cannot be
 * reused. This mechanism prevents re-execution of each "step" but allows the creation of new initialization steps in
 * case an upgrade adds a module that needs to be initialized.
 *
 * For example:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * contract MyToken is ERC20Upgradeable {
 *     function initialize() initializer public {
 *         __ERC20_init("MyToken", "MTK");
 *     }
 * }
 * contract MyTokenV2 is MyToken, ERC20PermitUpgradeable {
 *     function initializeV2() reinitializer(2) public {
 *         __ERC20Permit_init("MyToken");
 *     }
 * }
 * ```
 *
 * TIP: To avoid leaving the proxy in an uninitialized state, the initializer function should be called as early as
 * possible by providing the encoded function call as the `_data` argument to {ERC1967Proxy-constructor}.
 *
 * CAUTION: When used with inheritance, manual care must be taken to not invoke a parent initializer twice, or to ensure
 * that all initializers are idempotent. This is not verified automatically as constructors are by Solidity.
 *
 * [CAUTION]
 * ====
 * Avoid leaving a contract uninitialized.
 *
 * An uninitialized contract can be taken over by an attacker. This applies to both a proxy and its implementation
 * contract, which may impact the proxy. To prevent the implementation contract from being used, you should invoke
 * the {_disableInitializers} function in the constructor to automatically lock it when it is deployed:
 *
 * [.hljs-theme-light.nopadding]
 * ```
 * /// @custom:oz-upgrades-unsafe-allow constructor
 * constructor() {
 *     _disableInitializers();
 * }
 * ```
 * ====
 */
abstract contract Initializable {
    /**
     * @dev Indicates that the contract has been initialized.
     * @custom:oz-retyped-from bool
     */
    uint8 private _initialized;

    /**
     * @dev Indicates that the contract is in the process of being initialized.
     */
    bool private _initializing;

    /**
     * @dev Triggered when the contract has been initialized or reinitialized.
     */
    event Initialized(uint8 version);

    /**
     * @dev A modifier that defines a protected initializer function that can be invoked at most once. In its scope,
     * `onlyInitializing` functions can be used to initialize parent contracts.
     *
     * Similar to `reinitializer(1)`, except that functions marked with `initializer` can be nested in the context of a
     * constructor.
     *
     * Emits an {Initialized} event.
     */
    modifier initializer() {
        bool isTopLevelCall = !_initializing;
        require(
            (isTopLevelCall && _initialized < 1) || (!AddressUpgradeable.isContract(address(this)) && _initialized == 1),
            "Initializable: contract is already initialized"
        );
        _initialized = 1;
        if (isTopLevelCall) {
            _initializing = true;
        }
        _;
        if (isTopLevelCall) {
            _initializing = false;
            emit Initialized(1);
        }
    }

    /**
     * @dev A modifier that defines a protected reinitializer function that can be invoked at most once, and only if the
     * contract hasn't been initialized to a greater version before. In its scope, `onlyInitializing` functions can be
     * used to initialize parent contracts.
     *
     * A reinitializer may be used after the original initialization step. This is essential to configure modules that
     * are added through upgrades and that require initialization.
     *
     * When `version` is 1, this modifier is similar to `initializer`, except that functions marked with `reinitializer`
     * cannot be nested. If one is invoked in the context of another, execution will revert.
     *
     * Note that versions can jump in increments greater than 1; this implies that if multiple reinitializers coexist in
     * a contract, executing them in the right order is up to the developer or operator.
     *
     * WARNING: setting the version to 255 will prevent any future reinitialization.
     *
     * Emits an {Initialized} event.
     */
    modifier reinitializer(uint8 version) {
        require(!_initializing && _initialized < version, "Initializable: contract is already initialized");
        _initialized = version;
        _initializing = true;
        _;
        _initializing = false;
        emit Initialized(version);
    }

    /**
     * @dev Modifier to protect an initialization function so that it can only be invoked by functions with the
     * {initializer} and {reinitializer} modifiers, directly or indirectly.
     */
    modifier onlyInitializing() {
        require(_initializing, "Initializable: contract is not initializing");
        _;
    }

    /**
     * @dev Locks the contract, preventing any future reinitialization. This cannot be part of an initializer call.
     * Calling this in the constructor of a contract will prevent that contract from being initialized or reinitialized
     * to any version. It is recommended to use this to lock implementation contracts that are designed to be called
     * through proxies.
     *
     * Emits an {Initialized} event the first time it is successfully executed.
     */
    function _disableInitializers() internal virtual {
        require(!_initializing, "Initializable: contract is initializing");
        if (_initialized < type(uint8).max) {
            _initialized = type(uint8).max;
            emit Initialized(type(uint8).max);
        }
    }

    /**
     * @dev Returns the highest version that has been initialized. See {reinitializer}.
     */
    function _getInitializedVersion() internal view returns (uint8) {
        return _initialized;
    }

    /**
     * @dev Returns `true` if the contract is currently initializing. See {onlyInitializing}.
     */
    function _isInitializing() internal view returns (bool) {
        return _initializing;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC20/extensions/IERC20Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC20Upgradeable.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20MetadataUpgradeable is IERC20Upgradeable {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

    /**
     * @dev Returns the symbol of the token.
     */
    function symbol() external view returns (string memory);

    /**
     * @dev Returns the decimals places of the token.
     */
    function decimals() external view returns (uint8);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20Upgradeable {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165Upgradeable.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721Upgradeable is IERC165Upgradeable {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables `approved` to manage the `tokenId` token.
     */
    event Approval(address indexed owner, address indexed approved, uint256 indexed tokenId);

    /**
     * @dev Emitted when `owner` enables or disables (`approved`) `operator` to manage all of its assets.
     */
    event ApprovalForAll(address indexed owner, address indexed operator, bool approved);

    /**
     * @dev Returns the number of tokens in ``owner``'s account.
     */
    function balanceOf(address owner) external view returns (uint256 balance);

    /**
     * @dev Returns the owner of the `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function ownerOf(uint256 tokenId) external view returns (address owner);

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes calldata data
    ) external;

    /**
     * @dev Safely transfers `tokenId` token from `from` to `to`, checking first that contract recipients
     * are aware of the ERC721 protocol to prevent tokens from being forever locked.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If the caller is not `from`, it must have been allowed to move this token by either {approve} or {setApprovalForAll}.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Transfers `tokenId` token from `from` to `to`.
     *
     * WARNING: Note that the caller is responsible to confirm that the recipient is capable of receiving ERC721
     * or else they may be permanently lost. Usage of {safeTransferFrom} prevents loss, though the caller must
     * understand this adds an external call which potentially creates a reentrancy vulnerability.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     * - If the caller is not `from`, it must be approved to move this token by either {approve} or {setApprovalForAll}.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) external;

    /**
     * @dev Gives permission to `to` to transfer `tokenId` token to another account.
     * The approval is cleared when the token is transferred.
     *
     * Only a single account can be approved at a time, so approving the zero address clears previous approvals.
     *
     * Requirements:
     *
     * - The caller must own the token or be an approved operator.
     * - `tokenId` must exist.
     *
     * Emits an {Approval} event.
     */
    function approve(address to, uint256 tokenId) external;

    /**
     * @dev Approve or remove `operator` as an operator for the caller.
     * Operators can call {transferFrom} or {safeTransferFrom} for any token owned by the caller.
     *
     * Requirements:
     *
     * - The `operator` cannot be the caller.
     *
     * Emits an {ApprovalForAll} event.
     */
    function setApprovalForAll(address operator, bool _approved) external;

    /**
     * @dev Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @dev Returns if the `operator` is allowed to manage all of the assets of `owner`.
     *
     * See {setApprovalForAll}
     */
    function isApprovedForAll(address owner, address operator) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library AddressUpgradeable {
    /**
     * @dev Returns true if `account` is a contract.
     *
     * [IMPORTANT]
     * ====
     * It is unsafe to assume that an address for which this function returns
     * false is an externally-owned account (EOA) and not a contract.
     *
     * Among others, `isContract` will return false for the following
     * types of addresses:
     *
     *  - an externally-owned account
     *  - a contract in construction
     *  - an address where a contract will be created
     *  - an address where a contract lived, but was destroyed
     * ====
     *
     * [IMPORTANT]
     * ====
     * You shouldn't rely on `isContract` to protect against flash loan attacks!
     *
     * Preventing calls from contracts is highly discouraged. It breaks composability, breaks support for smart wallets
     * like Gnosis Safe, and does not provide security since it can be circumvented by calling from a contract
     * constructor.
     * ====
     */
    function isContract(address account) internal view returns (bool) {
        // This method relies on extcodesize/address.code.length, which returns 0
        // for contracts in construction, since the code is only stored at the end
        // of the constructor execution.

        return account.code.length > 0;
    }

    /**
     * @dev Replacement for Solidity's `transfer`: sends `amount` wei to
     * `recipient`, forwarding all available gas and reverting on errors.
     *
     * https://eips.ethereum.org/EIPS/eip-1884[EIP1884] increases the gas cost
     * of certain opcodes, possibly making contracts go over the 2300 gas limit
     * imposed by `transfer`, making them unable to receive funds via
     * `transfer`. {sendValue} removes this limitation.
     *
     * https://diligence.consensys.net/posts/2019/09/stop-using-soliditys-transfer-now/[Learn more].
     *
     * IMPORTANT: because control is transferred to `recipient`, care must be
     * taken to not create reentrancy vulnerabilities. Consider using
     * {ReentrancyGuard} or the
     * https://solidity.readthedocs.io/en/v0.5.11/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        require(address(this).balance >= amount, "Address: insufficient balance");

        (bool success, ) = recipient.call{value: amount}("");
        require(success, "Address: unable to send value, recipient may have reverted");
    }

    /**
     * @dev Performs a Solidity function call using a low level `call`. A
     * plain `call` is an unsafe replacement for a function call: use this
     * function instead.
     *
     * If `target` reverts with a revert reason, it is bubbled up by this
     * function (like regular Solidity function calls).
     *
     * Returns the raw returned data. To convert to the expected return value,
     * use https://solidity.readthedocs.io/en/latest/units-and-global-variables.html?highlight=abi.decode#abi-encoding-and-decoding-functions[`abi.decode`].
     *
     * Requirements:
     *
     * - `target` must be a contract.
     * - calling `target` with `data` must not revert.
     *
     * _Available since v3.1._
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, "Address: low-level call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`], but with
     * `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but also transferring `value` wei to `target`.
     *
     * Requirements:
     *
     * - the calling contract must have an ETH balance of at least `value`.
     * - the called Solidity function must be `payable`.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value
    ) internal returns (bytes memory) {
        return functionCallWithValue(target, data, value, "Address: low-level call with value failed");
    }

    /**
     * @dev Same as {xref-Address-functionCallWithValue-address-bytes-uint256-}[`functionCallWithValue`], but
     * with `errorMessage` as a fallback revert reason when `target` reverts.
     *
     * _Available since v3.1._
     */
    function functionCallWithValue(
        address target,
        bytes memory data,
        uint256 value,
        string memory errorMessage
    ) internal returns (bytes memory) {
        require(address(this).balance >= value, "Address: insufficient balance for call");
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(address target, bytes memory data) internal view returns (bytes memory) {
        return functionStaticCall(target, data, "Address: low-level static call failed");
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a static call.
     *
     * _Available since v3.3._
     */
    function functionStaticCall(
        address target,
        bytes memory data,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        (bool success, bytes memory returndata) = target.staticcall(data);
        return verifyCallResultFromTarget(target, success, returndata, errorMessage);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and revert (either by bubbling
     * the revert reason or using the provided one) in case of unsuccessful call or if target was not a contract.
     *
     * _Available since v4.8._
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal view returns (bytes memory) {
        if (success) {
            if (returndata.length == 0) {
                // only check isContract if the call was successful and the return data is empty
                // otherwise we already know that it was a contract
                require(isContract(target), "Address: call to non-contract");
            }
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and revert if it wasn't, either by bubbling the
     * revert reason or using the provided one.
     *
     * _Available since v4.3._
     */
    function verifyCallResult(
        bool success,
        bytes memory returndata,
        string memory errorMessage
    ) internal pure returns (bytes memory) {
        if (success) {
            return returndata;
        } else {
            _revert(returndata, errorMessage);
        }
    }

    function _revert(bytes memory returndata, string memory errorMessage) private pure {
        // Look for revert reason and bubble it up if present
        if (returndata.length > 0) {
            // The easiest way to bubble the revert reason is using memory via assembly
            /// @solidity memory-safe-assembly
            assembly {
                let returndata_size := mload(returndata)
                revert(add(32, returndata), returndata_size)
            }
        } else {
            revert(errorMessage);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/IERC165.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165Upgradeable {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library MathUpgradeable {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @dev Emitted when `value` tokens are moved from one account (`from`) to
     * another (`to`).
     *
     * Note that `value` may be zero.
     */
    event Transfer(address indexed from, address indexed to, uint256 value);

    /**
     * @dev Emitted when the allowance of a `spender` for an `owner` is set by
     * a call to {approve}. `value` is the new allowance.
     */
    event Approval(address indexed owner, address indexed spender, uint256 value);

    /**
     * @dev Returns the amount of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns the amount of tokens owned by `account`.
     */
    function balanceOf(address account) external view returns (uint256);

    /**
     * @dev Moves `amount` tokens from the caller's account to `to`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address to, uint256 amount) external returns (bool);

    /**
     * @dev Returns the remaining number of tokens that `spender` will be
     * allowed to spend on behalf of `owner` through {transferFrom}. This is
     * zero by default.
     *
     * This value changes when {approve} or {transferFrom} are called.
     */
    function allowance(address owner, address spender) external view returns (uint256);

    /**
     * @dev Sets `amount` as the allowance of `spender` over the caller's tokens.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * IMPORTANT: Beware that changing an allowance with this method brings the risk
     * that someone may use both the old and the new allowance by unfortunate
     * transaction ordering. One possible solution to mitigate this race
     * condition is to first reduce the spender's allowance to 0 and set the
     * desired value afterwards:
     * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
     *
     * Emits an {Approval} event.
     */
    function approve(address spender, uint256 amount) external returns (bool);

    /**
     * @dev Moves `amount` tokens from `from` to `to` using the
     * allowance mechanism. `amount` is then deducted from the caller's
     * allowance.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transferFrom(
        address from,
        address to,
        uint256 amount
    ) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

/**
 * @dev Standard math utilities missing in the Solidity language.
 */
library Math {
    enum Rounding {
        Down, // Toward negative infinity
        Up, // Toward infinity
        Zero // Toward zero
    }

    /**
     * @dev Returns the largest of two numbers.
     */
    function max(uint256 a, uint256 b) internal pure returns (uint256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two numbers.
     */
    function min(uint256 a, uint256 b) internal pure returns (uint256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two numbers. The result is rounded towards
     * zero.
     */
    function average(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b) / 2 can overflow.
        return (a & b) + (a ^ b) / 2;
    }

    /**
     * @dev Returns the ceiling of the division of two numbers.
     *
     * This differs from standard division with `/` in that it rounds up instead
     * of rounding down.
     */
    function ceilDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        // (a + b - 1) / b can overflow on addition, so we distribute.
        return a == 0 ? 0 : (a - 1) / b + 1;
    }

    /**
     * @notice Calculates floor(x * y / denominator) with full precision. Throws if result overflows a uint256 or denominator == 0
     * @dev Original credit to Remco Bloemen under MIT license (https://xn--2-umb.com/21/muldiv)
     * with further edits by Uniswap Labs also under MIT license.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator
    ) internal pure returns (uint256 result) {
        unchecked {
            // 512-bit multiply [prod1 prod0] = x * y. Compute the product mod 2^256 and mod 2^256 - 1, then use
            // use the Chinese Remainder Theorem to reconstruct the 512 bit result. The result is stored in two 256
            // variables such that product = prod1 * 2^256 + prod0.
            uint256 prod0; // Least significant 256 bits of the product
            uint256 prod1; // Most significant 256 bits of the product
            assembly {
                let mm := mulmod(x, y, not(0))
                prod0 := mul(x, y)
                prod1 := sub(sub(mm, prod0), lt(mm, prod0))
            }

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1);

            ///////////////////////////////////////////////
            // 512 by 256 division.
            ///////////////////////////////////////////////

            // Make division exact by subtracting the remainder from [prod1 prod0].
            uint256 remainder;
            assembly {
                // Compute remainder using mulmod.
                remainder := mulmod(x, y, denominator)

                // Subtract 256 bit number from 512 bit number.
                prod1 := sub(prod1, gt(remainder, prod0))
                prod0 := sub(prod0, remainder)
            }

            // Factor powers of two out of denominator and compute largest power of two divisor of denominator. Always >= 1.
            // See https://cs.stackexchange.com/q/138556/92363.

            // Does not overflow because the denominator cannot be zero at this stage in the function.
            uint256 twos = denominator & (~denominator + 1);
            assembly {
                // Divide denominator by twos.
                denominator := div(denominator, twos)

                // Divide [prod1 prod0] by twos.
                prod0 := div(prod0, twos)

                // Flip twos such that it is 2^256 / twos. If twos is zero, then it becomes one.
                twos := add(div(sub(0, twos), twos), 1)
            }

            // Shift in bits from prod1 into prod0.
            prod0 |= prod1 * twos;

            // Invert denominator mod 2^256. Now that denominator is an odd number, it has an inverse modulo 2^256 such
            // that denominator * inv = 1 mod 2^256. Compute the inverse by starting with a seed that is correct for
            // four bits. That is, denominator * inv = 1 mod 2^4.
            uint256 inverse = (3 * denominator) ^ 2;

            // Use the Newton-Raphson iteration to improve the precision. Thanks to Hensel's lifting lemma, this also works
            // in modular arithmetic, doubling the correct bits in each step.
            inverse *= 2 - denominator * inverse; // inverse mod 2^8
            inverse *= 2 - denominator * inverse; // inverse mod 2^16
            inverse *= 2 - denominator * inverse; // inverse mod 2^32
            inverse *= 2 - denominator * inverse; // inverse mod 2^64
            inverse *= 2 - denominator * inverse; // inverse mod 2^128
            inverse *= 2 - denominator * inverse; // inverse mod 2^256

            // Because the division is now exact we can divide by multiplying with the modular inverse of denominator.
            // This will give us the correct result modulo 2^256. Since the preconditions guarantee that the outcome is
            // less than 2^256, this is the final result. We don't need to compute the high bits of the result and prod1
            // is no longer required.
            result = prod0 * inverse;
            return result;
        }
    }

    /**
     * @notice Calculates x * y / denominator with full precision, following the selected rounding direction.
     */
    function mulDiv(
        uint256 x,
        uint256 y,
        uint256 denominator,
        Rounding rounding
    ) internal pure returns (uint256) {
        uint256 result = mulDiv(x, y, denominator);
        if (rounding == Rounding.Up && mulmod(x, y, denominator) > 0) {
            result += 1;
        }
        return result;
    }

    /**
     * @dev Returns the square root of a number. If the number is not a perfect square, the value is rounded down.
     *
     * Inspired by Henry S. Warren, Jr.'s "Hacker's Delight" (Chapter 11).
     */
    function sqrt(uint256 a) internal pure returns (uint256) {
        if (a == 0) {
            return 0;
        }

        // For our first guess, we get the biggest power of 2 which is smaller than the square root of the target.
        //
        // We know that the "msb" (most significant bit) of our target number `a` is a power of 2 such that we have
        // `msb(a) <= a < 2*msb(a)`. This value can be written `msb(a)=2**k` with `k=log2(a)`.
        //
        // This can be rewritten `2**log2(a) <= a < 2**(log2(a) + 1)`
        // → `sqrt(2**k) <= sqrt(a) < sqrt(2**(k+1))`
        // → `2**(k/2) <= sqrt(a) < 2**((k+1)/2) <= 2**(k/2 + 1)`
        //
        // Consequently, `2**(log2(a) / 2)` is a good first approximation of `sqrt(a)` with at least 1 correct bit.
        uint256 result = 1 << (log2(a) >> 1);

        // At this point `result` is an estimation with one bit of precision. We know the true value is a uint128,
        // since it is the square root of a uint256. Newton's method converges quadratically (precision doubles at
        // every iteration). We thus need at most 7 iteration to turn our partial result with one bit of precision
        // into the expected uint128 result.
        unchecked {
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            result = (result + a / result) >> 1;
            return min(result, a / result);
        }
    }

    /**
     * @notice Calculates sqrt(a), following the selected rounding direction.
     */
    function sqrt(uint256 a, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = sqrt(a);
            return result + (rounding == Rounding.Up && result * result < a ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 2, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 128;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 64;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 32;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 16;
            }
            if (value >> 8 > 0) {
                value >>= 8;
                result += 8;
            }
            if (value >> 4 > 0) {
                value >>= 4;
                result += 4;
            }
            if (value >> 2 > 0) {
                value >>= 2;
                result += 2;
            }
            if (value >> 1 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 2, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log2(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log2(value);
            return result + (rounding == Rounding.Up && 1 << result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 10, rounded down, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >= 10**64) {
                value /= 10**64;
                result += 64;
            }
            if (value >= 10**32) {
                value /= 10**32;
                result += 32;
            }
            if (value >= 10**16) {
                value /= 10**16;
                result += 16;
            }
            if (value >= 10**8) {
                value /= 10**8;
                result += 8;
            }
            if (value >= 10**4) {
                value /= 10**4;
                result += 4;
            }
            if (value >= 10**2) {
                value /= 10**2;
                result += 2;
            }
            if (value >= 10**1) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log10(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log10(value);
            return result + (rounding == Rounding.Up && 10**result < value ? 1 : 0);
        }
    }

    /**
     * @dev Return the log in base 256, rounded down, of a positive value.
     * Returns 0 if given 0.
     *
     * Adding one to the result gives the number of pairs of hex symbols needed to represent `value` as a hex string.
     */
    function log256(uint256 value) internal pure returns (uint256) {
        uint256 result = 0;
        unchecked {
            if (value >> 128 > 0) {
                value >>= 128;
                result += 16;
            }
            if (value >> 64 > 0) {
                value >>= 64;
                result += 8;
            }
            if (value >> 32 > 0) {
                value >>= 32;
                result += 4;
            }
            if (value >> 16 > 0) {
                value >>= 16;
                result += 2;
            }
            if (value >> 8 > 0) {
                result += 1;
            }
        }
        return result;
    }

    /**
     * @dev Return the log in base 10, following the selected rounding direction, of a positive value.
     * Returns 0 if given 0.
     */
    function log256(uint256 value, Rounding rounding) internal pure returns (uint256) {
        unchecked {
            uint256 result = log256(value);
            return result + (rounding == Rounding.Up && 1 << (result * 8) < value ? 1 : 0);
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/math/SafeCast.sol)
// This file was procedurally generated from scripts/generate/templates/SafeCast.js.

pragma solidity ^0.8.0;

/**
 * @dev Wrappers over Solidity's uintXX/intXX casting operators with added overflow
 * checks.
 *
 * Downcasting from uint256/int256 in Solidity does not revert on overflow. This can
 * easily result in undesired exploitation or bugs, since developers usually
 * assume that overflows raise errors. `SafeCast` restores this intuition by
 * reverting the transaction when such an operation overflows.
 *
 * Using this library instead of the unchecked operations eliminates an entire
 * class of bugs, so it's recommended to use it always.
 *
 * Can be combined with {SafeMath} and {SignedSafeMath} to extend it to smaller types, by performing
 * all math on `uint256` and `int256` and then downcasting.
 */
library SafeCast {
    /**
     * @dev Returns the downcasted uint248 from uint256, reverting on
     * overflow (when the input is greater than largest uint248).
     *
     * Counterpart to Solidity's `uint248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toUint248(uint256 value) internal pure returns (uint248) {
        require(value <= type(uint248).max, "SafeCast: value doesn't fit in 248 bits");
        return uint248(value);
    }

    /**
     * @dev Returns the downcasted uint240 from uint256, reverting on
     * overflow (when the input is greater than largest uint240).
     *
     * Counterpart to Solidity's `uint240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toUint240(uint256 value) internal pure returns (uint240) {
        require(value <= type(uint240).max, "SafeCast: value doesn't fit in 240 bits");
        return uint240(value);
    }

    /**
     * @dev Returns the downcasted uint232 from uint256, reverting on
     * overflow (when the input is greater than largest uint232).
     *
     * Counterpart to Solidity's `uint232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toUint232(uint256 value) internal pure returns (uint232) {
        require(value <= type(uint232).max, "SafeCast: value doesn't fit in 232 bits");
        return uint232(value);
    }

    /**
     * @dev Returns the downcasted uint224 from uint256, reverting on
     * overflow (when the input is greater than largest uint224).
     *
     * Counterpart to Solidity's `uint224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.2._
     */
    function toUint224(uint256 value) internal pure returns (uint224) {
        require(value <= type(uint224).max, "SafeCast: value doesn't fit in 224 bits");
        return uint224(value);
    }

    /**
     * @dev Returns the downcasted uint216 from uint256, reverting on
     * overflow (when the input is greater than largest uint216).
     *
     * Counterpart to Solidity's `uint216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toUint216(uint256 value) internal pure returns (uint216) {
        require(value <= type(uint216).max, "SafeCast: value doesn't fit in 216 bits");
        return uint216(value);
    }

    /**
     * @dev Returns the downcasted uint208 from uint256, reverting on
     * overflow (when the input is greater than largest uint208).
     *
     * Counterpart to Solidity's `uint208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toUint208(uint256 value) internal pure returns (uint208) {
        require(value <= type(uint208).max, "SafeCast: value doesn't fit in 208 bits");
        return uint208(value);
    }

    /**
     * @dev Returns the downcasted uint200 from uint256, reverting on
     * overflow (when the input is greater than largest uint200).
     *
     * Counterpart to Solidity's `uint200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toUint200(uint256 value) internal pure returns (uint200) {
        require(value <= type(uint200).max, "SafeCast: value doesn't fit in 200 bits");
        return uint200(value);
    }

    /**
     * @dev Returns the downcasted uint192 from uint256, reverting on
     * overflow (when the input is greater than largest uint192).
     *
     * Counterpart to Solidity's `uint192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toUint192(uint256 value) internal pure returns (uint192) {
        require(value <= type(uint192).max, "SafeCast: value doesn't fit in 192 bits");
        return uint192(value);
    }

    /**
     * @dev Returns the downcasted uint184 from uint256, reverting on
     * overflow (when the input is greater than largest uint184).
     *
     * Counterpart to Solidity's `uint184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toUint184(uint256 value) internal pure returns (uint184) {
        require(value <= type(uint184).max, "SafeCast: value doesn't fit in 184 bits");
        return uint184(value);
    }

    /**
     * @dev Returns the downcasted uint176 from uint256, reverting on
     * overflow (when the input is greater than largest uint176).
     *
     * Counterpart to Solidity's `uint176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toUint176(uint256 value) internal pure returns (uint176) {
        require(value <= type(uint176).max, "SafeCast: value doesn't fit in 176 bits");
        return uint176(value);
    }

    /**
     * @dev Returns the downcasted uint168 from uint256, reverting on
     * overflow (when the input is greater than largest uint168).
     *
     * Counterpart to Solidity's `uint168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toUint168(uint256 value) internal pure returns (uint168) {
        require(value <= type(uint168).max, "SafeCast: value doesn't fit in 168 bits");
        return uint168(value);
    }

    /**
     * @dev Returns the downcasted uint160 from uint256, reverting on
     * overflow (when the input is greater than largest uint160).
     *
     * Counterpart to Solidity's `uint160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toUint160(uint256 value) internal pure returns (uint160) {
        require(value <= type(uint160).max, "SafeCast: value doesn't fit in 160 bits");
        return uint160(value);
    }

    /**
     * @dev Returns the downcasted uint152 from uint256, reverting on
     * overflow (when the input is greater than largest uint152).
     *
     * Counterpart to Solidity's `uint152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toUint152(uint256 value) internal pure returns (uint152) {
        require(value <= type(uint152).max, "SafeCast: value doesn't fit in 152 bits");
        return uint152(value);
    }

    /**
     * @dev Returns the downcasted uint144 from uint256, reverting on
     * overflow (when the input is greater than largest uint144).
     *
     * Counterpart to Solidity's `uint144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toUint144(uint256 value) internal pure returns (uint144) {
        require(value <= type(uint144).max, "SafeCast: value doesn't fit in 144 bits");
        return uint144(value);
    }

    /**
     * @dev Returns the downcasted uint136 from uint256, reverting on
     * overflow (when the input is greater than largest uint136).
     *
     * Counterpart to Solidity's `uint136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toUint136(uint256 value) internal pure returns (uint136) {
        require(value <= type(uint136).max, "SafeCast: value doesn't fit in 136 bits");
        return uint136(value);
    }

    /**
     * @dev Returns the downcasted uint128 from uint256, reverting on
     * overflow (when the input is greater than largest uint128).
     *
     * Counterpart to Solidity's `uint128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v2.5._
     */
    function toUint128(uint256 value) internal pure returns (uint128) {
        require(value <= type(uint128).max, "SafeCast: value doesn't fit in 128 bits");
        return uint128(value);
    }

    /**
     * @dev Returns the downcasted uint120 from uint256, reverting on
     * overflow (when the input is greater than largest uint120).
     *
     * Counterpart to Solidity's `uint120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toUint120(uint256 value) internal pure returns (uint120) {
        require(value <= type(uint120).max, "SafeCast: value doesn't fit in 120 bits");
        return uint120(value);
    }

    /**
     * @dev Returns the downcasted uint112 from uint256, reverting on
     * overflow (when the input is greater than largest uint112).
     *
     * Counterpart to Solidity's `uint112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toUint112(uint256 value) internal pure returns (uint112) {
        require(value <= type(uint112).max, "SafeCast: value doesn't fit in 112 bits");
        return uint112(value);
    }

    /**
     * @dev Returns the downcasted uint104 from uint256, reverting on
     * overflow (when the input is greater than largest uint104).
     *
     * Counterpart to Solidity's `uint104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toUint104(uint256 value) internal pure returns (uint104) {
        require(value <= type(uint104).max, "SafeCast: value doesn't fit in 104 bits");
        return uint104(value);
    }

    /**
     * @dev Returns the downcasted uint96 from uint256, reverting on
     * overflow (when the input is greater than largest uint96).
     *
     * Counterpart to Solidity's `uint96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.2._
     */
    function toUint96(uint256 value) internal pure returns (uint96) {
        require(value <= type(uint96).max, "SafeCast: value doesn't fit in 96 bits");
        return uint96(value);
    }

    /**
     * @dev Returns the downcasted uint88 from uint256, reverting on
     * overflow (when the input is greater than largest uint88).
     *
     * Counterpart to Solidity's `uint88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toUint88(uint256 value) internal pure returns (uint88) {
        require(value <= type(uint88).max, "SafeCast: value doesn't fit in 88 bits");
        return uint88(value);
    }

    /**
     * @dev Returns the downcasted uint80 from uint256, reverting on
     * overflow (when the input is greater than largest uint80).
     *
     * Counterpart to Solidity's `uint80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toUint80(uint256 value) internal pure returns (uint80) {
        require(value <= type(uint80).max, "SafeCast: value doesn't fit in 80 bits");
        return uint80(value);
    }

    /**
     * @dev Returns the downcasted uint72 from uint256, reverting on
     * overflow (when the input is greater than largest uint72).
     *
     * Counterpart to Solidity's `uint72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toUint72(uint256 value) internal pure returns (uint72) {
        require(value <= type(uint72).max, "SafeCast: value doesn't fit in 72 bits");
        return uint72(value);
    }

    /**
     * @dev Returns the downcasted uint64 from uint256, reverting on
     * overflow (when the input is greater than largest uint64).
     *
     * Counterpart to Solidity's `uint64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v2.5._
     */
    function toUint64(uint256 value) internal pure returns (uint64) {
        require(value <= type(uint64).max, "SafeCast: value doesn't fit in 64 bits");
        return uint64(value);
    }

    /**
     * @dev Returns the downcasted uint56 from uint256, reverting on
     * overflow (when the input is greater than largest uint56).
     *
     * Counterpart to Solidity's `uint56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toUint56(uint256 value) internal pure returns (uint56) {
        require(value <= type(uint56).max, "SafeCast: value doesn't fit in 56 bits");
        return uint56(value);
    }

    /**
     * @dev Returns the downcasted uint48 from uint256, reverting on
     * overflow (when the input is greater than largest uint48).
     *
     * Counterpart to Solidity's `uint48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toUint48(uint256 value) internal pure returns (uint48) {
        require(value <= type(uint48).max, "SafeCast: value doesn't fit in 48 bits");
        return uint48(value);
    }

    /**
     * @dev Returns the downcasted uint40 from uint256, reverting on
     * overflow (when the input is greater than largest uint40).
     *
     * Counterpart to Solidity's `uint40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toUint40(uint256 value) internal pure returns (uint40) {
        require(value <= type(uint40).max, "SafeCast: value doesn't fit in 40 bits");
        return uint40(value);
    }

    /**
     * @dev Returns the downcasted uint32 from uint256, reverting on
     * overflow (when the input is greater than largest uint32).
     *
     * Counterpart to Solidity's `uint32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v2.5._
     */
    function toUint32(uint256 value) internal pure returns (uint32) {
        require(value <= type(uint32).max, "SafeCast: value doesn't fit in 32 bits");
        return uint32(value);
    }

    /**
     * @dev Returns the downcasted uint24 from uint256, reverting on
     * overflow (when the input is greater than largest uint24).
     *
     * Counterpart to Solidity's `uint24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toUint24(uint256 value) internal pure returns (uint24) {
        require(value <= type(uint24).max, "SafeCast: value doesn't fit in 24 bits");
        return uint24(value);
    }

    /**
     * @dev Returns the downcasted uint16 from uint256, reverting on
     * overflow (when the input is greater than largest uint16).
     *
     * Counterpart to Solidity's `uint16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v2.5._
     */
    function toUint16(uint256 value) internal pure returns (uint16) {
        require(value <= type(uint16).max, "SafeCast: value doesn't fit in 16 bits");
        return uint16(value);
    }

    /**
     * @dev Returns the downcasted uint8 from uint256, reverting on
     * overflow (when the input is greater than largest uint8).
     *
     * Counterpart to Solidity's `uint8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v2.5._
     */
    function toUint8(uint256 value) internal pure returns (uint8) {
        require(value <= type(uint8).max, "SafeCast: value doesn't fit in 8 bits");
        return uint8(value);
    }

    /**
     * @dev Converts a signed int256 into an unsigned uint256.
     *
     * Requirements:
     *
     * - input must be greater than or equal to 0.
     *
     * _Available since v3.0._
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @dev Returns the downcasted int248 from int256, reverting on
     * overflow (when the input is less than smallest int248 or
     * greater than largest int248).
     *
     * Counterpart to Solidity's `int248` operator.
     *
     * Requirements:
     *
     * - input must fit into 248 bits
     *
     * _Available since v4.7._
     */
    function toInt248(int256 value) internal pure returns (int248 downcasted) {
        downcasted = int248(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 248 bits");
    }

    /**
     * @dev Returns the downcasted int240 from int256, reverting on
     * overflow (when the input is less than smallest int240 or
     * greater than largest int240).
     *
     * Counterpart to Solidity's `int240` operator.
     *
     * Requirements:
     *
     * - input must fit into 240 bits
     *
     * _Available since v4.7._
     */
    function toInt240(int256 value) internal pure returns (int240 downcasted) {
        downcasted = int240(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 240 bits");
    }

    /**
     * @dev Returns the downcasted int232 from int256, reverting on
     * overflow (when the input is less than smallest int232 or
     * greater than largest int232).
     *
     * Counterpart to Solidity's `int232` operator.
     *
     * Requirements:
     *
     * - input must fit into 232 bits
     *
     * _Available since v4.7._
     */
    function toInt232(int256 value) internal pure returns (int232 downcasted) {
        downcasted = int232(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 232 bits");
    }

    /**
     * @dev Returns the downcasted int224 from int256, reverting on
     * overflow (when the input is less than smallest int224 or
     * greater than largest int224).
     *
     * Counterpart to Solidity's `int224` operator.
     *
     * Requirements:
     *
     * - input must fit into 224 bits
     *
     * _Available since v4.7._
     */
    function toInt224(int256 value) internal pure returns (int224 downcasted) {
        downcasted = int224(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 224 bits");
    }

    /**
     * @dev Returns the downcasted int216 from int256, reverting on
     * overflow (when the input is less than smallest int216 or
     * greater than largest int216).
     *
     * Counterpart to Solidity's `int216` operator.
     *
     * Requirements:
     *
     * - input must fit into 216 bits
     *
     * _Available since v4.7._
     */
    function toInt216(int256 value) internal pure returns (int216 downcasted) {
        downcasted = int216(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 216 bits");
    }

    /**
     * @dev Returns the downcasted int208 from int256, reverting on
     * overflow (when the input is less than smallest int208 or
     * greater than largest int208).
     *
     * Counterpart to Solidity's `int208` operator.
     *
     * Requirements:
     *
     * - input must fit into 208 bits
     *
     * _Available since v4.7._
     */
    function toInt208(int256 value) internal pure returns (int208 downcasted) {
        downcasted = int208(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 208 bits");
    }

    /**
     * @dev Returns the downcasted int200 from int256, reverting on
     * overflow (when the input is less than smallest int200 or
     * greater than largest int200).
     *
     * Counterpart to Solidity's `int200` operator.
     *
     * Requirements:
     *
     * - input must fit into 200 bits
     *
     * _Available since v4.7._
     */
    function toInt200(int256 value) internal pure returns (int200 downcasted) {
        downcasted = int200(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 200 bits");
    }

    /**
     * @dev Returns the downcasted int192 from int256, reverting on
     * overflow (when the input is less than smallest int192 or
     * greater than largest int192).
     *
     * Counterpart to Solidity's `int192` operator.
     *
     * Requirements:
     *
     * - input must fit into 192 bits
     *
     * _Available since v4.7._
     */
    function toInt192(int256 value) internal pure returns (int192 downcasted) {
        downcasted = int192(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 192 bits");
    }

    /**
     * @dev Returns the downcasted int184 from int256, reverting on
     * overflow (when the input is less than smallest int184 or
     * greater than largest int184).
     *
     * Counterpart to Solidity's `int184` operator.
     *
     * Requirements:
     *
     * - input must fit into 184 bits
     *
     * _Available since v4.7._
     */
    function toInt184(int256 value) internal pure returns (int184 downcasted) {
        downcasted = int184(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 184 bits");
    }

    /**
     * @dev Returns the downcasted int176 from int256, reverting on
     * overflow (when the input is less than smallest int176 or
     * greater than largest int176).
     *
     * Counterpart to Solidity's `int176` operator.
     *
     * Requirements:
     *
     * - input must fit into 176 bits
     *
     * _Available since v4.7._
     */
    function toInt176(int256 value) internal pure returns (int176 downcasted) {
        downcasted = int176(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 176 bits");
    }

    /**
     * @dev Returns the downcasted int168 from int256, reverting on
     * overflow (when the input is less than smallest int168 or
     * greater than largest int168).
     *
     * Counterpart to Solidity's `int168` operator.
     *
     * Requirements:
     *
     * - input must fit into 168 bits
     *
     * _Available since v4.7._
     */
    function toInt168(int256 value) internal pure returns (int168 downcasted) {
        downcasted = int168(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 168 bits");
    }

    /**
     * @dev Returns the downcasted int160 from int256, reverting on
     * overflow (when the input is less than smallest int160 or
     * greater than largest int160).
     *
     * Counterpart to Solidity's `int160` operator.
     *
     * Requirements:
     *
     * - input must fit into 160 bits
     *
     * _Available since v4.7._
     */
    function toInt160(int256 value) internal pure returns (int160 downcasted) {
        downcasted = int160(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 160 bits");
    }

    /**
     * @dev Returns the downcasted int152 from int256, reverting on
     * overflow (when the input is less than smallest int152 or
     * greater than largest int152).
     *
     * Counterpart to Solidity's `int152` operator.
     *
     * Requirements:
     *
     * - input must fit into 152 bits
     *
     * _Available since v4.7._
     */
    function toInt152(int256 value) internal pure returns (int152 downcasted) {
        downcasted = int152(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 152 bits");
    }

    /**
     * @dev Returns the downcasted int144 from int256, reverting on
     * overflow (when the input is less than smallest int144 or
     * greater than largest int144).
     *
     * Counterpart to Solidity's `int144` operator.
     *
     * Requirements:
     *
     * - input must fit into 144 bits
     *
     * _Available since v4.7._
     */
    function toInt144(int256 value) internal pure returns (int144 downcasted) {
        downcasted = int144(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 144 bits");
    }

    /**
     * @dev Returns the downcasted int136 from int256, reverting on
     * overflow (when the input is less than smallest int136 or
     * greater than largest int136).
     *
     * Counterpart to Solidity's `int136` operator.
     *
     * Requirements:
     *
     * - input must fit into 136 bits
     *
     * _Available since v4.7._
     */
    function toInt136(int256 value) internal pure returns (int136 downcasted) {
        downcasted = int136(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 136 bits");
    }

    /**
     * @dev Returns the downcasted int128 from int256, reverting on
     * overflow (when the input is less than smallest int128 or
     * greater than largest int128).
     *
     * Counterpart to Solidity's `int128` operator.
     *
     * Requirements:
     *
     * - input must fit into 128 bits
     *
     * _Available since v3.1._
     */
    function toInt128(int256 value) internal pure returns (int128 downcasted) {
        downcasted = int128(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 128 bits");
    }

    /**
     * @dev Returns the downcasted int120 from int256, reverting on
     * overflow (when the input is less than smallest int120 or
     * greater than largest int120).
     *
     * Counterpart to Solidity's `int120` operator.
     *
     * Requirements:
     *
     * - input must fit into 120 bits
     *
     * _Available since v4.7._
     */
    function toInt120(int256 value) internal pure returns (int120 downcasted) {
        downcasted = int120(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 120 bits");
    }

    /**
     * @dev Returns the downcasted int112 from int256, reverting on
     * overflow (when the input is less than smallest int112 or
     * greater than largest int112).
     *
     * Counterpart to Solidity's `int112` operator.
     *
     * Requirements:
     *
     * - input must fit into 112 bits
     *
     * _Available since v4.7._
     */
    function toInt112(int256 value) internal pure returns (int112 downcasted) {
        downcasted = int112(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 112 bits");
    }

    /**
     * @dev Returns the downcasted int104 from int256, reverting on
     * overflow (when the input is less than smallest int104 or
     * greater than largest int104).
     *
     * Counterpart to Solidity's `int104` operator.
     *
     * Requirements:
     *
     * - input must fit into 104 bits
     *
     * _Available since v4.7._
     */
    function toInt104(int256 value) internal pure returns (int104 downcasted) {
        downcasted = int104(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 104 bits");
    }

    /**
     * @dev Returns the downcasted int96 from int256, reverting on
     * overflow (when the input is less than smallest int96 or
     * greater than largest int96).
     *
     * Counterpart to Solidity's `int96` operator.
     *
     * Requirements:
     *
     * - input must fit into 96 bits
     *
     * _Available since v4.7._
     */
    function toInt96(int256 value) internal pure returns (int96 downcasted) {
        downcasted = int96(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 96 bits");
    }

    /**
     * @dev Returns the downcasted int88 from int256, reverting on
     * overflow (when the input is less than smallest int88 or
     * greater than largest int88).
     *
     * Counterpart to Solidity's `int88` operator.
     *
     * Requirements:
     *
     * - input must fit into 88 bits
     *
     * _Available since v4.7._
     */
    function toInt88(int256 value) internal pure returns (int88 downcasted) {
        downcasted = int88(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 88 bits");
    }

    /**
     * @dev Returns the downcasted int80 from int256, reverting on
     * overflow (when the input is less than smallest int80 or
     * greater than largest int80).
     *
     * Counterpart to Solidity's `int80` operator.
     *
     * Requirements:
     *
     * - input must fit into 80 bits
     *
     * _Available since v4.7._
     */
    function toInt80(int256 value) internal pure returns (int80 downcasted) {
        downcasted = int80(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 80 bits");
    }

    /**
     * @dev Returns the downcasted int72 from int256, reverting on
     * overflow (when the input is less than smallest int72 or
     * greater than largest int72).
     *
     * Counterpart to Solidity's `int72` operator.
     *
     * Requirements:
     *
     * - input must fit into 72 bits
     *
     * _Available since v4.7._
     */
    function toInt72(int256 value) internal pure returns (int72 downcasted) {
        downcasted = int72(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 72 bits");
    }

    /**
     * @dev Returns the downcasted int64 from int256, reverting on
     * overflow (when the input is less than smallest int64 or
     * greater than largest int64).
     *
     * Counterpart to Solidity's `int64` operator.
     *
     * Requirements:
     *
     * - input must fit into 64 bits
     *
     * _Available since v3.1._
     */
    function toInt64(int256 value) internal pure returns (int64 downcasted) {
        downcasted = int64(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 64 bits");
    }

    /**
     * @dev Returns the downcasted int56 from int256, reverting on
     * overflow (when the input is less than smallest int56 or
     * greater than largest int56).
     *
     * Counterpart to Solidity's `int56` operator.
     *
     * Requirements:
     *
     * - input must fit into 56 bits
     *
     * _Available since v4.7._
     */
    function toInt56(int256 value) internal pure returns (int56 downcasted) {
        downcasted = int56(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 56 bits");
    }

    /**
     * @dev Returns the downcasted int48 from int256, reverting on
     * overflow (when the input is less than smallest int48 or
     * greater than largest int48).
     *
     * Counterpart to Solidity's `int48` operator.
     *
     * Requirements:
     *
     * - input must fit into 48 bits
     *
     * _Available since v4.7._
     */
    function toInt48(int256 value) internal pure returns (int48 downcasted) {
        downcasted = int48(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 48 bits");
    }

    /**
     * @dev Returns the downcasted int40 from int256, reverting on
     * overflow (when the input is less than smallest int40 or
     * greater than largest int40).
     *
     * Counterpart to Solidity's `int40` operator.
     *
     * Requirements:
     *
     * - input must fit into 40 bits
     *
     * _Available since v4.7._
     */
    function toInt40(int256 value) internal pure returns (int40 downcasted) {
        downcasted = int40(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 40 bits");
    }

    /**
     * @dev Returns the downcasted int32 from int256, reverting on
     * overflow (when the input is less than smallest int32 or
     * greater than largest int32).
     *
     * Counterpart to Solidity's `int32` operator.
     *
     * Requirements:
     *
     * - input must fit into 32 bits
     *
     * _Available since v3.1._
     */
    function toInt32(int256 value) internal pure returns (int32 downcasted) {
        downcasted = int32(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 32 bits");
    }

    /**
     * @dev Returns the downcasted int24 from int256, reverting on
     * overflow (when the input is less than smallest int24 or
     * greater than largest int24).
     *
     * Counterpart to Solidity's `int24` operator.
     *
     * Requirements:
     *
     * - input must fit into 24 bits
     *
     * _Available since v4.7._
     */
    function toInt24(int256 value) internal pure returns (int24 downcasted) {
        downcasted = int24(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 24 bits");
    }

    /**
     * @dev Returns the downcasted int16 from int256, reverting on
     * overflow (when the input is less than smallest int16 or
     * greater than largest int16).
     *
     * Counterpart to Solidity's `int16` operator.
     *
     * Requirements:
     *
     * - input must fit into 16 bits
     *
     * _Available since v3.1._
     */
    function toInt16(int256 value) internal pure returns (int16 downcasted) {
        downcasted = int16(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 16 bits");
    }

    /**
     * @dev Returns the downcasted int8 from int256, reverting on
     * overflow (when the input is less than smallest int8 or
     * greater than largest int8).
     *
     * Counterpart to Solidity's `int8` operator.
     *
     * Requirements:
     *
     * - input must fit into 8 bits
     *
     * _Available since v3.1._
     */
    function toInt8(int256 value) internal pure returns (int8 downcasted) {
        downcasted = int8(value);
        require(downcasted == value, "SafeCast: value doesn't fit in 8 bits");
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     *
     * _Available since v3.0._
     */
    function toInt256(uint256 value) internal pure returns (int256) {
        // Note: Unsafe cast below is okay because `type(int256).max` is guaranteed to be positive
        require(value <= uint256(type(int256).max), "SafeCast: value doesn't fit in an int256");
        return int256(value);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.6.0) (utils/math/SafeMath.sol)

pragma solidity ^0.8.0;

// CAUTION
// This version of SafeMath should only be used with Solidity 0.8 or later,
// because it relies on the compiler's built in overflow checks.

/**
 * @dev Wrappers over Solidity's arithmetic operations.
 *
 * NOTE: `SafeMath` is generally not needed starting with Solidity 0.8, since the compiler
 * now has built in overflow checking.
 */
library SafeMath {
    /**
     * @dev Returns the addition of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryAdd(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            uint256 c = a + b;
            if (c < a) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function trySub(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b > a) return (false, 0);
            return (true, a - b);
        }
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, with an overflow flag.
     *
     * _Available since v3.4._
     */
    function tryMul(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            // Gas optimization: this is cheaper than requiring 'a' not being zero, but the
            // benefit is lost if 'b' is also tested.
            // See: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/522
            if (a == 0) return (true, 0);
            uint256 c = a * b;
            if (c / a != b) return (false, 0);
            return (true, c);
        }
    }

    /**
     * @dev Returns the division of two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryDiv(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a / b);
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers, with a division by zero flag.
     *
     * _Available since v3.4._
     */
    function tryMod(uint256 a, uint256 b) internal pure returns (bool, uint256) {
        unchecked {
            if (b == 0) return (false, 0);
            return (true, a % b);
        }
    }

    /**
     * @dev Returns the addition of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `+` operator.
     *
     * Requirements:
     *
     * - Addition cannot overflow.
     */
    function add(uint256 a, uint256 b) internal pure returns (uint256) {
        return a + b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting on
     * overflow (when the result is negative).
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(uint256 a, uint256 b) internal pure returns (uint256) {
        return a - b;
    }

    /**
     * @dev Returns the multiplication of two unsigned integers, reverting on
     * overflow.
     *
     * Counterpart to Solidity's `*` operator.
     *
     * Requirements:
     *
     * - Multiplication cannot overflow.
     */
    function mul(uint256 a, uint256 b) internal pure returns (uint256) {
        return a * b;
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator.
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(uint256 a, uint256 b) internal pure returns (uint256) {
        return a / b;
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting when dividing by zero.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(uint256 a, uint256 b) internal pure returns (uint256) {
        return a % b;
    }

    /**
     * @dev Returns the subtraction of two unsigned integers, reverting with custom message on
     * overflow (when the result is negative).
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {trySub}.
     *
     * Counterpart to Solidity's `-` operator.
     *
     * Requirements:
     *
     * - Subtraction cannot overflow.
     */
    function sub(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b <= a, errorMessage);
            return a - b;
        }
    }

    /**
     * @dev Returns the integer division of two unsigned integers, reverting with custom message on
     * division by zero. The result is rounded towards zero.
     *
     * Counterpart to Solidity's `/` operator. Note: this function uses a
     * `revert` opcode (which leaves remaining gas untouched) while Solidity
     * uses an invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function div(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a / b;
        }
    }

    /**
     * @dev Returns the remainder of dividing two unsigned integers. (unsigned integer modulo),
     * reverting with custom message when dividing by zero.
     *
     * CAUTION: This function is deprecated because it requires allocating memory for the error
     * message unnecessarily. For custom revert reasons use {tryMod}.
     *
     * Counterpart to Solidity's `%` operator. This function uses a `revert`
     * opcode (which leaves remaining gas untouched) while Solidity uses an
     * invalid opcode to revert (consuming all remaining gas).
     *
     * Requirements:
     *
     * - The divisor cannot be zero.
     */
    function mod(
        uint256 a,
        uint256 b,
        string memory errorMessage
    ) internal pure returns (uint256) {
        unchecked {
            require(b > 0, errorMessage);
            return a % b;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (utils/structs/EnumerableSet.sol)
// This file was procedurally generated from scripts/generate/templates/EnumerableSet.js.

pragma solidity ^0.8.0;

/**
 * @dev Library for managing
 * https://en.wikipedia.org/wiki/Set_(abstract_data_type)[sets] of primitive
 * types.
 *
 * Sets have the following properties:
 *
 * - Elements are added, removed, and checked for existence in constant time
 * (O(1)).
 * - Elements are enumerated in O(n). No guarantees are made on the ordering.
 *
 * ```
 * contract Example {
 *     // Add the library methods
 *     using EnumerableSet for EnumerableSet.AddressSet;
 *
 *     // Declare a set state variable
 *     EnumerableSet.AddressSet private mySet;
 * }
 * ```
 *
 * As of v3.3.0, sets of type `bytes32` (`Bytes32Set`), `address` (`AddressSet`)
 * and `uint256` (`UintSet`) are supported.
 *
 * [WARNING]
 * ====
 * Trying to delete such a structure from storage will likely result in data corruption, rendering the structure
 * unusable.
 * See https://github.com/ethereum/solidity/pull/11843[ethereum/solidity#11843] for more info.
 *
 * In order to clean an EnumerableSet, you can either remove all elements one by one or create a fresh instance using an
 * array of EnumerableSet.
 * ====
 */
library EnumerableSet {
    // To implement this library for multiple types with as little code
    // repetition as possible, we write it in terms of a generic Set type with
    // bytes32 values.
    // The Set implementation uses private functions, and user-facing
    // implementations (such as AddressSet) are just wrappers around the
    // underlying Set.
    // This means that we can only create new EnumerableSets for types that fit
    // in bytes32.

    struct Set {
        // Storage of set values
        bytes32[] _values;
        // Position of the value in the `values` array, plus 1 because index 0
        // means a value is not in the set.
        mapping(bytes32 => uint256) _indexes;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function _add(Set storage set, bytes32 value) private returns (bool) {
        if (!_contains(set, value)) {
            set._values.push(value);
            // The value is stored at length-1, but we add 1 to all indexes
            // and use 0 as a sentinel value
            set._indexes[value] = set._values.length;
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function _remove(Set storage set, bytes32 value) private returns (bool) {
        // We read and store the value's index to prevent multiple reads from the same storage slot
        uint256 valueIndex = set._indexes[value];

        if (valueIndex != 0) {
            // Equivalent to contains(set, value)
            // To delete an element from the _values array in O(1), we swap the element to delete with the last one in
            // the array, and then remove the last element (sometimes called as 'swap and pop').
            // This modifies the order of the array, as noted in {at}.

            uint256 toDeleteIndex = valueIndex - 1;
            uint256 lastIndex = set._values.length - 1;

            if (lastIndex != toDeleteIndex) {
                bytes32 lastValue = set._values[lastIndex];

                // Move the last value to the index where the value to delete is
                set._values[toDeleteIndex] = lastValue;
                // Update the index for the moved value
                set._indexes[lastValue] = valueIndex; // Replace lastValue's index to valueIndex
            }

            // Delete the slot where the moved value was stored
            set._values.pop();

            // Delete the index for the deleted slot
            delete set._indexes[value];

            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function _contains(Set storage set, bytes32 value) private view returns (bool) {
        return set._indexes[value] != 0;
    }

    /**
     * @dev Returns the number of values on the set. O(1).
     */
    function _length(Set storage set) private view returns (uint256) {
        return set._values.length;
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function _at(Set storage set, uint256 index) private view returns (bytes32) {
        return set._values[index];
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function _values(Set storage set) private view returns (bytes32[] memory) {
        return set._values;
    }

    // Bytes32Set

    struct Bytes32Set {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _add(set._inner, value);
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(Bytes32Set storage set, bytes32 value) internal returns (bool) {
        return _remove(set._inner, value);
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(Bytes32Set storage set, bytes32 value) internal view returns (bool) {
        return _contains(set._inner, value);
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(Bytes32Set storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(Bytes32Set storage set, uint256 index) internal view returns (bytes32) {
        return _at(set._inner, index);
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(Bytes32Set storage set) internal view returns (bytes32[] memory) {
        bytes32[] memory store = _values(set._inner);
        bytes32[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // AddressSet

    struct AddressSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(AddressSet storage set, address value) internal returns (bool) {
        return _add(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(AddressSet storage set, address value) internal returns (bool) {
        return _remove(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(AddressSet storage set, address value) internal view returns (bool) {
        return _contains(set._inner, bytes32(uint256(uint160(value))));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(AddressSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(AddressSet storage set, uint256 index) internal view returns (address) {
        return address(uint160(uint256(_at(set._inner, index))));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(AddressSet storage set) internal view returns (address[] memory) {
        bytes32[] memory store = _values(set._inner);
        address[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }

    // UintSet

    struct UintSet {
        Set _inner;
    }

    /**
     * @dev Add a value to a set. O(1).
     *
     * Returns true if the value was added to the set, that is if it was not
     * already present.
     */
    function add(UintSet storage set, uint256 value) internal returns (bool) {
        return _add(set._inner, bytes32(value));
    }

    /**
     * @dev Removes a value from a set. O(1).
     *
     * Returns true if the value was removed from the set, that is if it was
     * present.
     */
    function remove(UintSet storage set, uint256 value) internal returns (bool) {
        return _remove(set._inner, bytes32(value));
    }

    /**
     * @dev Returns true if the value is in the set. O(1).
     */
    function contains(UintSet storage set, uint256 value) internal view returns (bool) {
        return _contains(set._inner, bytes32(value));
    }

    /**
     * @dev Returns the number of values in the set. O(1).
     */
    function length(UintSet storage set) internal view returns (uint256) {
        return _length(set._inner);
    }

    /**
     * @dev Returns the value stored at position `index` in the set. O(1).
     *
     * Note that there are no guarantees on the ordering of values inside the
     * array, and it may change when more values are added or removed.
     *
     * Requirements:
     *
     * - `index` must be strictly less than {length}.
     */
    function at(UintSet storage set, uint256 index) internal view returns (uint256) {
        return uint256(_at(set._inner, index));
    }

    /**
     * @dev Return the entire set in an array
     *
     * WARNING: This operation will copy the entire storage to memory, which can be quite expensive. This is designed
     * to mostly be used by view accessors that are queried without any gas fees. Developers should keep in mind that
     * this function has an unbounded cost, and using it as part of a state-changing function may render the function
     * uncallable if the set grows to a point where copying to memory consumes too much gas to fit in a block.
     */
    function values(UintSet storage set) internal view returns (uint256[] memory) {
        bytes32[] memory store = _values(set._inner);
        uint256[] memory result;

        /// @solidity memory-safe-assembly
        assembly {
            result := store
        }

        return result;
    }
}

pragma solidity >=0.8.0 <0.9.0;
// SPDX-License-Identifier: MIT

import "../Types.sol";
import "../interfaces/IEAS.sol";
import "../interfaces/IASRegistry.sol";

/**
 * @title TellerAS - Teller Attestation Service - based on EAS - Ethereum Attestation Service
 */
contract TellerAS is IEAS {
    error AccessDenied();
    error AlreadyRevoked();
    error InvalidAttestation();
    error InvalidExpirationTime();
    error InvalidOffset();
    error InvalidRegistry();
    error InvalidSchema();
    error InvalidVerifier();
    error NotFound();
    error NotPayable();

    string public constant VERSION = "0.8";

    // A terminator used when concatenating and hashing multiple fields.
    string private constant HASH_TERMINATOR = "@";

    // The AS global registry.
    IASRegistry private immutable _asRegistry;

    // The EIP712 verifier used to verify signed attestations.
    IEASEIP712Verifier private immutable _eip712Verifier;

    // A mapping between attestations and their related attestations.
    mapping(bytes32 => bytes32[]) private _relatedAttestations;

    // A mapping between an account and its received attestations.
    mapping(address => mapping(bytes32 => bytes32[]))
        private _receivedAttestations;

    // A mapping between an account and its sent attestations.
    mapping(address => mapping(bytes32 => bytes32[])) private _sentAttestations;

    // A mapping between a schema and its attestations.
    mapping(bytes32 => bytes32[]) private _schemaAttestations;

    // The global mapping between attestations and their UUIDs.
    mapping(bytes32 => Attestation) private _db;

    // The global counter for the total number of attestations.
    uint256 private _attestationsCount;

    bytes32 private _lastUUID;

    /**
     * @dev Creates a new EAS instance.
     *
     * @param registry The address of the global AS registry.
     * @param verifier The address of the EIP712 verifier.
     */
    constructor(IASRegistry registry, IEASEIP712Verifier verifier) {
        if (address(registry) == address(0x0)) {
            revert InvalidRegistry();
        }

        if (address(verifier) == address(0x0)) {
            revert InvalidVerifier();
        }

        _asRegistry = registry;
        _eip712Verifier = verifier;
    }

    /**
     * @inheritdoc IEAS
     */
    function getASRegistry() external view override returns (IASRegistry) {
        return _asRegistry;
    }

    /**
     * @inheritdoc IEAS
     */
    function getEIP712Verifier()
        external
        view
        override
        returns (IEASEIP712Verifier)
    {
        return _eip712Verifier;
    }

    /**
     * @inheritdoc IEAS
     */
    function getAttestationsCount() external view override returns (uint256) {
        return _attestationsCount;
    }

    /**
     * @inheritdoc IEAS
     */
    function attest(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data
    ) public payable virtual override returns (bytes32) {
        return
            _attest(
                recipient,
                schema,
                expirationTime,
                refUUID,
                data,
                msg.sender
            );
    }

    /**
     * @inheritdoc IEAS
     */
    function attestByDelegation(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public payable virtual override returns (bytes32) {
        _eip712Verifier.attest(
            recipient,
            schema,
            expirationTime,
            refUUID,
            data,
            attester,
            v,
            r,
            s
        );

        return
            _attest(recipient, schema, expirationTime, refUUID, data, attester);
    }

    /**
     * @inheritdoc IEAS
     */
    function revoke(bytes32 uuid) public virtual override {
        return _revoke(uuid, msg.sender);
    }

    /**
     * @inheritdoc IEAS
     */
    function revokeByDelegation(
        bytes32 uuid,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) public virtual override {
        _eip712Verifier.revoke(uuid, attester, v, r, s);

        _revoke(uuid, attester);
    }

    /**
     * @inheritdoc IEAS
     */
    function getAttestation(bytes32 uuid)
        external
        view
        override
        returns (Attestation memory)
    {
        return _db[uuid];
    }

    /**
     * @inheritdoc IEAS
     */
    function isAttestationValid(bytes32 uuid)
        public
        view
        override
        returns (bool)
    {
        return _db[uuid].uuid != 0;
    }

    /**
     * @inheritdoc IEAS
     */
    function isAttestationActive(bytes32 uuid)
        public
        view
        virtual
        override
        returns (bool)
    {
        return
            isAttestationValid(uuid) &&
            _db[uuid].expirationTime >= block.timestamp &&
            _db[uuid].revocationTime == 0;
    }

    /**
     * @inheritdoc IEAS
     */
    function getReceivedAttestationUUIDs(
        address recipient,
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view override returns (bytes32[] memory) {
        return
            _sliceUUIDs(
                _receivedAttestations[recipient][schema],
                start,
                length,
                reverseOrder
            );
    }

    /**
     * @inheritdoc IEAS
     */
    function getReceivedAttestationUUIDsCount(address recipient, bytes32 schema)
        external
        view
        override
        returns (uint256)
    {
        return _receivedAttestations[recipient][schema].length;
    }

    /**
     * @inheritdoc IEAS
     */
    function getSentAttestationUUIDs(
        address attester,
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view override returns (bytes32[] memory) {
        return
            _sliceUUIDs(
                _sentAttestations[attester][schema],
                start,
                length,
                reverseOrder
            );
    }

    /**
     * @inheritdoc IEAS
     */
    function getSentAttestationUUIDsCount(address recipient, bytes32 schema)
        external
        view
        override
        returns (uint256)
    {
        return _sentAttestations[recipient][schema].length;
    }

    /**
     * @inheritdoc IEAS
     */
    function getRelatedAttestationUUIDs(
        bytes32 uuid,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view override returns (bytes32[] memory) {
        return
            _sliceUUIDs(
                _relatedAttestations[uuid],
                start,
                length,
                reverseOrder
            );
    }

    /**
     * @inheritdoc IEAS
     */
    function getRelatedAttestationUUIDsCount(bytes32 uuid)
        external
        view
        override
        returns (uint256)
    {
        return _relatedAttestations[uuid].length;
    }

    /**
     * @inheritdoc IEAS
     */
    function getSchemaAttestationUUIDs(
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view override returns (bytes32[] memory) {
        return
            _sliceUUIDs(
                _schemaAttestations[schema],
                start,
                length,
                reverseOrder
            );
    }

    /**
     * @inheritdoc IEAS
     */
    function getSchemaAttestationUUIDsCount(bytes32 schema)
        external
        view
        override
        returns (uint256)
    {
        return _schemaAttestations[schema].length;
    }

    /**
     * @dev Attests to a specific AS.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     * @param expirationTime The expiration time of the attestation.
     * @param refUUID An optional related attestation's UUID.
     * @param data Additional custom data.
     * @param attester The attesting account.
     *
     * @return The UUID of the new attestation.
     */
    function _attest(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data,
        address attester
    ) private returns (bytes32) {
        if (expirationTime <= block.timestamp) {
            revert InvalidExpirationTime();
        }

        IASRegistry.ASRecord memory asRecord = _asRegistry.getAS(schema);
        if (asRecord.uuid == EMPTY_UUID) {
            revert InvalidSchema();
        }

        IASResolver resolver = asRecord.resolver;
        if (address(resolver) != address(0x0)) {
            if (msg.value != 0 && !resolver.isPayable()) {
                revert NotPayable();
            }

            if (
                !resolver.resolve{ value: msg.value }(
                    recipient,
                    asRecord.schema,
                    data,
                    expirationTime,
                    attester
                )
            ) {
                revert InvalidAttestation();
            }
        }

        Attestation memory attestation = Attestation({
            uuid: EMPTY_UUID,
            schema: schema,
            recipient: recipient,
            attester: attester,
            time: block.timestamp,
            expirationTime: expirationTime,
            revocationTime: 0,
            refUUID: refUUID,
            data: data
        });

        _lastUUID = _getUUID(attestation);
        attestation.uuid = _lastUUID;

        _receivedAttestations[recipient][schema].push(_lastUUID);
        _sentAttestations[attester][schema].push(_lastUUID);
        _schemaAttestations[schema].push(_lastUUID);

        _db[_lastUUID] = attestation;
        _attestationsCount++;

        if (refUUID != 0) {
            if (!isAttestationValid(refUUID)) {
                revert NotFound();
            }

            _relatedAttestations[refUUID].push(_lastUUID);
        }

        emit Attested(recipient, attester, _lastUUID, schema);

        return _lastUUID;
    }

    function getLastUUID() external view returns (bytes32) {
        return _lastUUID;
    }

    /**
     * @dev Revokes an existing attestation to a specific AS.
     *
     * @param uuid The UUID of the attestation to revoke.
     * @param attester The attesting account.
     */
    function _revoke(bytes32 uuid, address attester) private {
        Attestation storage attestation = _db[uuid];
        if (attestation.uuid == EMPTY_UUID) {
            revert NotFound();
        }

        if (attestation.attester != attester) {
            revert AccessDenied();
        }

        if (attestation.revocationTime != 0) {
            revert AlreadyRevoked();
        }

        attestation.revocationTime = block.timestamp;

        emit Revoked(attestation.recipient, attester, uuid, attestation.schema);
    }

    /**
     * @dev Calculates a UUID for a given attestation.
     *
     * @param attestation The input attestation.
     *
     * @return Attestation UUID.
     */
    function _getUUID(Attestation memory attestation)
        private
        view
        returns (bytes32)
    {
        return
            keccak256(
                abi.encodePacked(
                    attestation.schema,
                    attestation.recipient,
                    attestation.attester,
                    attestation.time,
                    attestation.expirationTime,
                    attestation.data,
                    HASH_TERMINATOR,
                    _attestationsCount
                )
            );
    }

    /**
     * @dev Returns a slice in an array of attestation UUIDs.
     *
     * @param uuids The array of attestation UUIDs.
     * @param start The offset to start from.
     * @param length The number of total members to retrieve.
     * @param reverseOrder Whether the offset starts from the end and the data is returned in reverse.
     *
     * @return An array of attestation UUIDs.
     */
    function _sliceUUIDs(
        bytes32[] memory uuids,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) private pure returns (bytes32[] memory) {
        uint256 attestationsLength = uuids.length;
        if (attestationsLength == 0) {
            return new bytes32[](0);
        }

        if (start >= attestationsLength) {
            revert InvalidOffset();
        }

        uint256 len = length;
        if (attestationsLength < start + length) {
            len = attestationsLength - start;
        }

        bytes32[] memory res = new bytes32[](len);

        for (uint256 i = 0; i < len; ++i) {
            res[i] = uuids[
                reverseOrder ? attestationsLength - (start + i + 1) : start + i
            ];
        }

        return res;
    }
}

// SPDX-Licence-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

enum CollateralType {
    ERC20,
    ERC721,
    ERC1155
}

struct Collateral {
    CollateralType _collateralType;
    uint256 _amount;
    uint256 _tokenId;
    address _collateralAddress;
}

interface ICollateralEscrowV1 {
    /**
     * @notice Deposits a collateral asset into the escrow.
     * @param _collateralType The type of collateral asset to deposit (ERC721, ERC1155).
     * @param _collateralAddress The address of the collateral token.i feel
     * @param _amount The amount to deposit.
     */
    function depositAsset(
        CollateralType _collateralType,
        address _collateralAddress,
        uint256 _amount,
        uint256 _tokenId
    ) external payable;

    /**
     * @notice Withdraws a collateral asset from the escrow.
     * @param _collateralAddress The address of the collateral contract.
     * @param _amount The amount to withdraw.
     * @param _recipient The address to send the assets to.
     */
    function withdraw(
        address _collateralAddress,
        uint256 _amount,
        address _recipient
    ) external;

    function withdrawDustTokens(        
        address _tokenAddress, 
        uint256 _amount,
        address _recipient
    ) external;


    function getBid() external view returns (uint256);

    function initialize(uint256 _bidId) external;


}

pragma solidity >=0.8.0 <0.9.0;
// SPDX-License-Identifier: MIT

import "./IASResolver.sol";

/**
 * @title The global AS registry interface.
 */
interface IASRegistry {
    /**
     * @title A struct representing a record for a submitted AS (Attestation Schema).
     */
    struct ASRecord {
        // A unique identifier of the AS.
        bytes32 uuid;
        // Optional schema resolver.
        IASResolver resolver;
        // Auto-incrementing index for reference, assigned by the registry itself.
        uint256 index;
        // Custom specification of the AS (e.g., an ABI).
        bytes schema;
    }

    /**
     * @dev Triggered when a new AS has been registered
     *
     * @param uuid The AS UUID.
     * @param index The AS index.
     * @param schema The AS schema.
     * @param resolver An optional AS schema resolver.
     * @param attester The address of the account used to register the AS.
     */
    event Registered(
        bytes32 indexed uuid,
        uint256 indexed index,
        bytes schema,
        IASResolver resolver,
        address attester
    );

    /**
     * @dev Submits and reserve a new AS
     *
     * @param schema The AS data schema.
     * @param resolver An optional AS schema resolver.
     *
     * @return The UUID of the new AS.
     */
    function register(bytes calldata schema, IASResolver resolver)
        external
        returns (bytes32);

    /**
     * @dev Returns an existing AS by UUID
     *
     * @param uuid The UUID of the AS to retrieve.
     *
     * @return The AS data members.
     */
    function getAS(bytes32 uuid) external view returns (ASRecord memory);

    /**
     * @dev Returns the global counter for the total number of attestations
     *
     * @return The global counter for the total number of attestations.
     */
    function getASCount() external view returns (uint256);
}

pragma solidity >=0.8.0 <0.9.0;

// SPDX-License-Identifier: MIT

/**
 * @title The interface of an optional AS resolver.
 */
interface IASResolver {
    /**
     * @dev Returns whether the resolver supports ETH transfers
     */
    function isPayable() external pure returns (bool);

    /**
     * @dev Resolves an attestation and verifier whether its data conforms to the spec.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The AS data schema.
     * @param data The actual attestation data.
     * @param expirationTime The expiration time of the attestation.
     * @param msgSender The sender of the original attestation message.
     *
     * @return Whether the data is valid according to the scheme.
     */
    function resolve(
        address recipient,
        bytes calldata schema,
        bytes calldata data,
        uint256 expirationTime,
        address msgSender
    ) external payable returns (bool);
}

// SPDX-Licence-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

import { Collateral } from "./escrow/ICollateralEscrowV1.sol";

interface ICollateralManager {
    /**
     * @notice Checks the validity of a borrower's collateral balance.
     * @param _bidId The id of the associated bid.
     * @param _collateralInfo Additional information about the collateral asset.
     * @return validation_ Boolean indicating if the collateral balance was validated.
     */
    function commitCollateral(
        uint256 _bidId,
        Collateral[] calldata _collateralInfo
    ) external returns (bool validation_);

    /**
     * @notice Checks the validity of a borrower's collateral balance and commits it to a bid.
     * @param _bidId The id of the associated bid.
     * @param _collateralInfo Additional information about the collateral asset.
     * @return validation_ Boolean indicating if the collateral balance was validated.
     */
    function commitCollateral(
        uint256 _bidId,
        Collateral calldata _collateralInfo
    ) external returns (bool validation_);

    function checkBalances(
        address _borrowerAddress,
        Collateral[] calldata _collateralInfo
    ) external returns (bool validated_, bool[] memory checks_);

    /**
     * @notice Deploys a new collateral escrow.
     * @param _bidId The associated bidId of the collateral escrow.
     */
    function deployAndDeposit(uint256 _bidId) external;

    /**
     * @notice Gets the address of a deployed escrow.
     * @notice _bidId The bidId to return the escrow for.
     * @return The address of the escrow.
     */
    function getEscrow(uint256 _bidId) external view returns (address);

    /**
     * @notice Gets the collateral info for a given bid id.
     * @param _bidId The bidId to return the collateral info for.
     * @return The stored collateral info.
     */
    function getCollateralInfo(uint256 _bidId)
        external
        view
        returns (Collateral[] memory);

    function getCollateralAmount(uint256 _bidId, address collateralAssetAddress)
        external
        view
        returns (uint256 _amount);

    /**
     * @notice Withdraws deposited collateral from the created escrow of a bid.
     * @param _bidId The id of the bid to withdraw collateral for.
     */
    function withdraw(uint256 _bidId) external;

    /**
     * @notice Re-checks the validity of a borrower's collateral balance committed to a bid.
     * @param _bidId The id of the associated bid.
     * @return validation_ Boolean indicating if the collateral balance was validated.
     */
    function revalidateCollateral(uint256 _bidId) external returns (bool);

    /**
     * @notice Sends the deposited collateral to a lender of a bid.
     * @notice Can only be called by the protocol.
     * @param _bidId The id of the liquidated bid.
     */
    function lenderClaimCollateral(uint256 _bidId) external;



    /**
     * @notice Sends the deposited collateral to a lender of a bid.
     * @notice Can only be called by the protocol.
     * @param _bidId The id of the liquidated bid.
     * @param _collateralRecipient the address that will receive the collateral 
     */
    function lenderClaimCollateralWithRecipient(uint256 _bidId, address _collateralRecipient) external;


    /**
     * @notice Sends the deposited collateral to a liquidator of a bid.
     * @notice Can only be called by the protocol.
     * @param _bidId The id of the liquidated bid.
     * @param _liquidatorAddress The address of the liquidator to send the collateral to.
     */
    function liquidateCollateral(uint256 _bidId, address _liquidatorAddress)
        external;
}

pragma solidity >=0.8.0 <0.9.0;
// SPDX-License-Identifier: MIT

import "./IASRegistry.sol";
import "./IEASEIP712Verifier.sol";

/**
 * @title EAS - Ethereum Attestation Service interface
 */
interface IEAS {
    /**
     * @dev A struct representing a single attestation.
     */
    struct Attestation {
        // A unique identifier of the attestation.
        bytes32 uuid;
        // A unique identifier of the AS.
        bytes32 schema;
        // The recipient of the attestation.
        address recipient;
        // The attester/sender of the attestation.
        address attester;
        // The time when the attestation was created (Unix timestamp).
        uint256 time;
        // The time when the attestation expires (Unix timestamp).
        uint256 expirationTime;
        // The time when the attestation was revoked (Unix timestamp).
        uint256 revocationTime;
        // The UUID of the related attestation.
        bytes32 refUUID;
        // Custom attestation data.
        bytes data;
    }

    /**
     * @dev Triggered when an attestation has been made.
     *
     * @param recipient The recipient of the attestation.
     * @param attester The attesting account.
     * @param uuid The UUID the revoked attestation.
     * @param schema The UUID of the AS.
     */
    event Attested(
        address indexed recipient,
        address indexed attester,
        bytes32 uuid,
        bytes32 indexed schema
    );

    /**
     * @dev Triggered when an attestation has been revoked.
     *
     * @param recipient The recipient of the attestation.
     * @param attester The attesting account.
     * @param schema The UUID of the AS.
     * @param uuid The UUID the revoked attestation.
     */
    event Revoked(
        address indexed recipient,
        address indexed attester,
        bytes32 uuid,
        bytes32 indexed schema
    );

    /**
     * @dev Returns the address of the AS global registry.
     *
     * @return The address of the AS global registry.
     */
    function getASRegistry() external view returns (IASRegistry);

    /**
     * @dev Returns the address of the EIP712 verifier used to verify signed attestations.
     *
     * @return The address of the EIP712 verifier used to verify signed attestations.
     */
    function getEIP712Verifier() external view returns (IEASEIP712Verifier);

    /**
     * @dev Returns the global counter for the total number of attestations.
     *
     * @return The global counter for the total number of attestations.
     */
    function getAttestationsCount() external view returns (uint256);

    /**
     * @dev Attests to a specific AS.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     * @param expirationTime The expiration time of the attestation.
     * @param refUUID An optional related attestation's UUID.
     * @param data Additional custom data.
     *
     * @return The UUID of the new attestation.
     */
    function attest(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data
    ) external payable returns (bytes32);

    /**
     * @dev Attests to a specific AS using a provided EIP712 signature.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     * @param expirationTime The expiration time of the attestation.
     * @param refUUID An optional related attestation's UUID.
     * @param data Additional custom data.
     * @param attester The attesting account.
     * @param v The recovery ID.
     * @param r The x-coordinate of the nonce R.
     * @param s The signature data.
     *
     * @return The UUID of the new attestation.
     */
    function attestByDelegation(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external payable returns (bytes32);

    /**
     * @dev Revokes an existing attestation to a specific AS.
     *
     * @param uuid The UUID of the attestation to revoke.
     */
    function revoke(bytes32 uuid) external;

    /**
     * @dev Attests to a specific AS using a provided EIP712 signature.
     *
     * @param uuid The UUID of the attestation to revoke.
     * @param attester The attesting account.
     * @param v The recovery ID.
     * @param r The x-coordinate of the nonce R.
     * @param s The signature data.
     */
    function revokeByDelegation(
        bytes32 uuid,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns an existing attestation by UUID.
     *
     * @param uuid The UUID of the attestation to retrieve.
     *
     * @return The attestation data members.
     */
    function getAttestation(bytes32 uuid)
        external
        view
        returns (Attestation memory);

    /**
     * @dev Checks whether an attestation exists.
     *
     * @param uuid The UUID of the attestation to retrieve.
     *
     * @return Whether an attestation exists.
     */
    function isAttestationValid(bytes32 uuid) external view returns (bool);

    /**
     * @dev Checks whether an attestation is active.
     *
     * @param uuid The UUID of the attestation to retrieve.
     *
     * @return Whether an attestation is active.
     */
    function isAttestationActive(bytes32 uuid) external view returns (bool);

    /**
     * @dev Returns all received attestation UUIDs.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     * @param start The offset to start from.
     * @param length The number of total members to retrieve.
     * @param reverseOrder Whether the offset starts from the end and the data is returned in reverse.
     *
     * @return An array of attestation UUIDs.
     */
    function getReceivedAttestationUUIDs(
        address recipient,
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view returns (bytes32[] memory);

    /**
     * @dev Returns the number of received attestation UUIDs.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     *
     * @return The number of attestations.
     */
    function getReceivedAttestationUUIDsCount(address recipient, bytes32 schema)
        external
        view
        returns (uint256);

    /**
     * @dev Returns all sent attestation UUIDs.
     *
     * @param attester The attesting account.
     * @param schema The UUID of the AS.
     * @param start The offset to start from.
     * @param length The number of total members to retrieve.
     * @param reverseOrder Whether the offset starts from the end and the data is returned in reverse.
     *
     * @return An array of attestation UUIDs.
     */
    function getSentAttestationUUIDs(
        address attester,
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view returns (bytes32[] memory);

    /**
     * @dev Returns the number of sent attestation UUIDs.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     *
     * @return The number of attestations.
     */
    function getSentAttestationUUIDsCount(address recipient, bytes32 schema)
        external
        view
        returns (uint256);

    /**
     * @dev Returns all attestations related to a specific attestation.
     *
     * @param uuid The UUID of the attestation to retrieve.
     * @param start The offset to start from.
     * @param length The number of total members to retrieve.
     * @param reverseOrder Whether the offset starts from the end and the data is returned in reverse.
     *
     * @return An array of attestation UUIDs.
     */
    function getRelatedAttestationUUIDs(
        bytes32 uuid,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view returns (bytes32[] memory);

    /**
     * @dev Returns the number of related attestation UUIDs.
     *
     * @param uuid The UUID of the attestation to retrieve.
     *
     * @return The number of related attestations.
     */
    function getRelatedAttestationUUIDsCount(bytes32 uuid)
        external
        view
        returns (uint256);

    /**
     * @dev Returns all per-schema attestation UUIDs.
     *
     * @param schema The UUID of the AS.
     * @param start The offset to start from.
     * @param length The number of total members to retrieve.
     * @param reverseOrder Whether the offset starts from the end and the data is returned in reverse.
     *
     * @return An array of attestation UUIDs.
     */
    function getSchemaAttestationUUIDs(
        bytes32 schema,
        uint256 start,
        uint256 length,
        bool reverseOrder
    ) external view returns (bytes32[] memory);

    /**
     * @dev Returns the number of per-schema  attestation UUIDs.
     *
     * @param schema The UUID of the AS.
     *
     * @return The number of attestations.
     */
    function getSchemaAttestationUUIDsCount(bytes32 schema)
        external
        view
        returns (uint256);
}

pragma solidity >=0.8.0 <0.9.0;

// SPDX-License-Identifier: MIT

/**
 * @title EIP712 typed signatures verifier for EAS delegated attestations interface.
 */
interface IEASEIP712Verifier {
    /**
     * @dev Returns the current nonce per-account.
     *
     * @param account The requested accunt.
     *
     * @return The current nonce.
     */
    function getNonce(address account) external view returns (uint256);

    /**
     * @dev Verifies signed attestation.
     *
     * @param recipient The recipient of the attestation.
     * @param schema The UUID of the AS.
     * @param expirationTime The expiration time of the attestation.
     * @param refUUID An optional related attestation's UUID.
     * @param data Additional custom data.
     * @param attester The attesting account.
     * @param v The recovery ID.
     * @param r The x-coordinate of the nonce R.
     * @param s The signature data.
     */
    function attest(
        address recipient,
        bytes32 schema,
        uint256 expirationTime,
        bytes32 refUUID,
        bytes calldata data,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Verifies signed revocations.
     *
     * @param uuid The UUID of the attestation to revoke.
     * @param attester The attesting account.
     * @param v The recovery ID.
     * @param r The x-coordinate of the nonce R.
     * @param s The signature data.
     */
    function revoke(
        bytes32 uuid,
        address attester,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.8.0 <0.9.0;

interface IEscrowVault {
    /**
     * @notice Deposit tokens on behalf of another account
     * @param account The address of the account
     * @param token The address of the token
     * @param amount The amount to increase the balance
     */
    function deposit(address account, address token, uint256 amount) external;

    function withdraw(address token, uint256 amount) external ;
}

pragma solidity >=0.8.0 <0.9.0;

// SPDX-License-Identifier: MIT
import "@openzeppelin/contracts-upgradeable/token/ERC721/IERC721Upgradeable.sol";

abstract contract ILenderManager is IERC721Upgradeable {
    /**
     * @notice Registers a new active lender for a loan, minting the nft.
     * @param _bidId The id for the loan to set.
     * @param _newLender The address of the new active lender.
     */
    function registerLoan(uint256 _bidId, address _newLender) external virtual;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

interface IMarketLiquidityRewards {
    struct RewardAllocation {
        address allocator;
        address rewardTokenAddress;
        uint256 rewardTokenAmount;
        uint256 marketId;
        //requirements for loan
        address requiredPrincipalTokenAddress; //0 for any
        address requiredCollateralTokenAddress; //0 for any  -- could be an enumerable set?
        uint256 minimumCollateralPerPrincipalAmount;
        uint256 rewardPerLoanPrincipalAmount;
        uint32 bidStartTimeMin;
        uint32 bidStartTimeMax;
        AllocationStrategy allocationStrategy;
    }

    enum AllocationStrategy {
        BORROWER,
        LENDER
    }

    function allocateRewards(RewardAllocation calldata _allocation)
        external
        returns (uint256 allocationId_);

    function increaseAllocationAmount(
        uint256 _allocationId,
        uint256 _tokenAmount
    ) external;

    function deallocateRewards(uint256 _allocationId, uint256 _amount) external;

    function claimRewards(uint256 _allocationId, uint256 _bidId) external;

    function rewardClaimedForBid(uint256 _bidId, uint256 _allocationId)
        external
        view
        returns (bool);

    function getRewardTokenAmount(uint256 _allocationId)
        external
        view
        returns (uint256);

    function initialize() external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "../EAS/TellerAS.sol";
import { PaymentType, PaymentCycleType } from "../libraries/V2Calculations.sol";

interface IMarketRegistry {
    function initialize(TellerAS tellerAs) external;

    function isVerifiedLender(uint256 _marketId, address _lender)
        external
        view
        returns (bool, bytes32);

    function isMarketOpen(uint256 _marketId) external view returns (bool);

    function isMarketClosed(uint256 _marketId) external view returns (bool);

    function isVerifiedBorrower(uint256 _marketId, address _borrower)
        external
        view
        returns (bool, bytes32);

    function getMarketOwner(uint256 _marketId) external view returns (address);

    function getMarketFeeRecipient(uint256 _marketId)
        external
        view
        returns (address);

    function getMarketURI(uint256 _marketId)
        external
        view
        returns (string memory);

    function getPaymentCycle(uint256 _marketId)
        external
        view
        returns (uint32, PaymentCycleType);

    function getPaymentDefaultDuration(uint256 _marketId)
        external
        view
        returns (uint32);

    function getBidExpirationTime(uint256 _marketId)
        external
        view
        returns (uint32);

    function getMarketplaceFee(uint256 _marketId)
        external
        view
        returns (uint16);

    function getPaymentType(uint256 _marketId)
        external
        view
        returns (PaymentType);

    function createMarket(
        address _initialOwner,
        uint32 _paymentCycleDuration,
        uint32 _paymentDefaultDuration,
        uint32 _bidExpirationTime,
        uint16 _feePercent,
        bool _requireLenderAttestation,
        bool _requireBorrowerAttestation,
        PaymentType _paymentType,
        PaymentCycleType _paymentCycleType,
        string calldata _uri
    ) external returns (uint256 marketId_);

    function createMarket(
        address _initialOwner,
        uint32 _paymentCycleDuration,
        uint32 _paymentDefaultDuration,
        uint32 _bidExpirationTime,
        uint16 _feePercent,
        bool _requireLenderAttestation,
        bool _requireBorrowerAttestation,
        string calldata _uri
    ) external returns (uint256 marketId_);

    function closeMarket(uint256 _marketId) external;
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

enum RepMark {
    Good,
    Delinquent,
    Default
}

interface IReputationManager {
    function initialize(address protocolAddress) external;

    function getDelinquentLoanIds(address _account)
        external
        returns (uint256[] memory);

    function getDefaultedLoanIds(address _account)
        external
        returns (uint256[] memory);

    function getCurrentDelinquentLoanIds(address _account)
        external
        returns (uint256[] memory);

    function getCurrentDefaultLoanIds(address _account)
        external
        returns (uint256[] memory);

    function updateAccountReputation(address _account) external;

    function updateAccountReputation(address _account, uint256 _bidId)
        external
        returns (RepMark);
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import { Payment, BidState } from "../TellerV2Storage.sol";
import { Collateral } from "./escrow/ICollateralEscrowV1.sol";

interface ITellerV2 {
    /**
     * @notice Function for a borrower to create a bid for a loan.
     * @param _lendingToken The lending token asset requested to be borrowed.
     * @param _marketplaceId The unique id of the marketplace for the bid.
     * @param _principal The principal amount of the loan bid.
     * @param _duration The recurrent length of time before which a payment is due.
     * @param _APR The proposed interest rate for the loan bid.
     * @param _metadataURI The URI for additional borrower loan information as part of loan bid.
     * @param _receiver The address where the loan amount will be sent to.
     */
    function submitBid(
        address _lendingToken,
        uint256 _marketplaceId,
        uint256 _principal,
        uint32 _duration,
        uint16 _APR,
        string calldata _metadataURI,
        address _receiver
    ) external returns (uint256 bidId_);

    /**
     * @notice Function for a borrower to create a bid for a loan with Collateral.
     * @param _lendingToken The lending token asset requested to be borrowed.
     * @param _marketplaceId The unique id of the marketplace for the bid.
     * @param _principal The principal amount of the loan bid.
     * @param _duration The recurrent length of time before which a payment is due.
     * @param _APR The proposed interest rate for the loan bid.
     * @param _metadataURI The URI for additional borrower loan information as part of loan bid.
     * @param _receiver The address where the loan amount will be sent to.
     * @param _collateralInfo Additional information about the collateral asset.
     */
    function submitBid(
        address _lendingToken,
        uint256 _marketplaceId,
        uint256 _principal,
        uint32 _duration,
        uint16 _APR,
        string calldata _metadataURI,
        address _receiver,
        Collateral[] calldata _collateralInfo
    ) external returns (uint256 bidId_);

    /**
     * @notice Function for a lender to accept a proposed loan bid.
     * @param _bidId The id of the loan bid to accept.
     */
    function lenderAcceptBid(uint256 _bidId)
        external
        returns (
            uint256 amountToProtocol,
            uint256 amountToMarketplace,
            uint256 amountToBorrower
        );

    /**
     * @notice Function for users to make the minimum amount due for an active loan.
     * @param _bidId The id of the loan to make the payment towards.
     */
    function repayLoanMinimum(uint256 _bidId) external;

    /**
     * @notice Function for users to repay an active loan in full.
     * @param _bidId The id of the loan to make the payment towards.
     */
    function repayLoanFull(uint256 _bidId) external;

    /**
     * @notice Function for users to make a payment towards an active loan.
     * @param _bidId The id of the loan to make the payment towards.
     * @param _amount The amount of the payment.
     */
    function repayLoan(uint256 _bidId, uint256 _amount) external;

    /**
     * @notice Checks to see if a borrower is delinquent.
     * @param _bidId The id of the loan bid to check for.
     */
    function isLoanDefaulted(uint256 _bidId) external view returns (bool);

    /**
     * @notice Checks to see if a loan was delinquent for longer than liquidation delay.
     * @param _bidId The id of the loan bid to check for.
     */
    function isLoanLiquidateable(uint256 _bidId) external view returns (bool);

    /**
     * @notice Checks to see if a borrower is delinquent.
     * @param _bidId The id of the loan bid to check for.
     */
    function isPaymentLate(uint256 _bidId) external view returns (bool);

    function getBidState(uint256 _bidId) external view returns (BidState);

    function getBorrowerActiveLoanIds(address _borrower)
        external
        view
        returns (uint256[] memory);

    /**
     * @notice Returns the borrower address for a given bid.
     * @param _bidId The id of the bid/loan to get the borrower for.
     * @return borrower_ The address of the borrower associated with the bid.
     */
    function getLoanBorrower(uint256 _bidId)
        external
        view
        returns (address borrower_);

    /**
     * @notice Returns the lender address for a given bid.
     * @param _bidId The id of the bid/loan to get the lender for.
     * @return lender_ The address of the lender associated with the bid.
     */
    function getLoanLender(uint256 _bidId)
        external
        view
        returns (address lender_);

    function getLoanLendingToken(uint256 _bidId)
        external
        view
        returns (address token_);

    function getLoanMarketId(uint256 _bidId) external view returns (uint256);

    function getLoanSummary(uint256 _bidId)
        external
        view
        returns (
            address borrower,
            address lender,
            uint256 marketId,
            address principalTokenAddress,
            uint256 principalAmount,
            uint32 acceptedTimestamp,
            uint32 lastRepaidTimestamp,
            BidState bidState
        );

    function calculateAmountOwed(uint256 _bidId, uint256 _timestamp)
        external
        view
        returns (Payment memory owed);

    function calculateAmountDue(uint256 _bidId, uint256 _timestamp)
        external
        view
        returns (Payment memory due);

    function lenderCloseLoan(uint256 _bidId) external;

    function lenderCloseLoanWithRecipient(uint256 _bidId, address _recipient)
        external;

    function liquidateLoanFull(uint256 _bidId) external;

    function liquidateLoanFullWithRecipient(uint256 _bidId, address _recipient)
        external;

    function getLoanDefaultTimestamp(uint256 _bidId)
        external
        view
        returns (uint256);


    function getEscrowVault() external view returns(address);
    function getProtocolFeeRecipient () external view returns(address);


   // function isPauser(address _account) external view returns(bool);
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.6.0 <0.9.0;

// ----------------------------------------------------------------------------
// BokkyPooBah's DateTime Library v1.01
//
// A gas-efficient Solidity date and time library
//
// https://github.com/bokkypoobah/BokkyPooBahsDateTimeLibrary
//
// Tested date range 1970/01/01 to 2345/12/31
//
// Conventions:
// Unit      | Range         | Notes
// :-------- |:-------------:|:-----
// timestamp | >= 0          | Unix timestamp, number of seconds since 1970/01/01 00:00:00 UTC
// year      | 1970 ... 2345 |
// month     | 1 ... 12      |
// day       | 1 ... 31      |
// hour      | 0 ... 23      |
// minute    | 0 ... 59      |
// second    | 0 ... 59      |
// dayOfWeek | 1 ... 7       | 1 = Monday, ..., 7 = Sunday
//
//
// Enjoy. (c) BokkyPooBah / Bok Consulting Pty Ltd 2018-2019. The MIT Licence.
// ----------------------------------------------------------------------------

library BokkyPooBahsDateTimeLibrary {
    uint constant SECONDS_PER_DAY = 24 * 60 * 60;
    uint constant SECONDS_PER_HOUR = 60 * 60;
    uint constant SECONDS_PER_MINUTE = 60;
    int constant OFFSET19700101 = 2440588;

    uint constant DOW_MON = 1;
    uint constant DOW_TUE = 2;
    uint constant DOW_WED = 3;
    uint constant DOW_THU = 4;
    uint constant DOW_FRI = 5;
    uint constant DOW_SAT = 6;
    uint constant DOW_SUN = 7;

    // ------------------------------------------------------------------------
    // Calculate the number of days from 1970/01/01 to year/month/day using
    // the date conversion algorithm from
    //   https://aa.usno.navy.mil/faq/JD_formula.html
    // and subtracting the offset 2440588 so that 1970/01/01 is day 0
    //
    // days = day
    //      - 32075
    //      + 1461 * (year + 4800 + (month - 14) / 12) / 4
    //      + 367 * (month - 2 - (month - 14) / 12 * 12) / 12
    //      - 3 * ((year + 4900 + (month - 14) / 12) / 100) / 4
    //      - offset
    // ------------------------------------------------------------------------
    function _daysFromDate(uint year, uint month, uint day)
        internal
        pure
        returns (uint _days)
    {
        require(year >= 1970);
        int _year = int(year);
        int _month = int(month);
        int _day = int(day);

        int __days = _day -
            32075 +
            (1461 * (_year + 4800 + (_month - 14) / 12)) /
            4 +
            (367 * (_month - 2 - ((_month - 14) / 12) * 12)) /
            12 -
            (3 * ((_year + 4900 + (_month - 14) / 12) / 100)) /
            4 -
            OFFSET19700101;

        _days = uint(__days);
    }

    // ------------------------------------------------------------------------
    // Calculate year/month/day from the number of days since 1970/01/01 using
    // the date conversion algorithm from
    //   http://aa.usno.navy.mil/faq/docs/JD_Formula.php
    // and adding the offset 2440588 so that 1970/01/01 is day 0
    //
    // int L = days + 68569 + offset
    // int N = 4 * L / 146097
    // L = L - (146097 * N + 3) / 4
    // year = 4000 * (L + 1) / 1461001
    // L = L - 1461 * year / 4 + 31
    // month = 80 * L / 2447
    // dd = L - 2447 * month / 80
    // L = month / 11
    // month = month + 2 - 12 * L
    // year = 100 * (N - 49) + year + L
    // ------------------------------------------------------------------------
    function _daysToDate(uint _days)
        internal
        pure
        returns (uint year, uint month, uint day)
    {
        int __days = int(_days);

        int L = __days + 68569 + OFFSET19700101;
        int N = (4 * L) / 146097;
        L = L - (146097 * N + 3) / 4;
        int _year = (4000 * (L + 1)) / 1461001;
        L = L - (1461 * _year) / 4 + 31;
        int _month = (80 * L) / 2447;
        int _day = L - (2447 * _month) / 80;
        L = _month / 11;
        _month = _month + 2 - 12 * L;
        _year = 100 * (N - 49) + _year + L;

        year = uint(_year);
        month = uint(_month);
        day = uint(_day);
    }

    function timestampFromDate(uint year, uint month, uint day)
        internal
        pure
        returns (uint timestamp)
    {
        timestamp = _daysFromDate(year, month, day) * SECONDS_PER_DAY;
    }

    function timestampFromDateTime(
        uint year,
        uint month,
        uint day,
        uint hour,
        uint minute,
        uint second
    ) internal pure returns (uint timestamp) {
        timestamp =
            _daysFromDate(year, month, day) *
            SECONDS_PER_DAY +
            hour *
            SECONDS_PER_HOUR +
            minute *
            SECONDS_PER_MINUTE +
            second;
    }

    function timestampToDate(uint timestamp)
        internal
        pure
        returns (uint year, uint month, uint day)
    {
        (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
    }

    function timestampToDateTime(uint timestamp)
        internal
        pure
        returns (
            uint year,
            uint month,
            uint day,
            uint hour,
            uint minute,
            uint second
        )
    {
        (year, month, day) = _daysToDate(timestamp / SECONDS_PER_DAY);
        uint secs = timestamp % SECONDS_PER_DAY;
        hour = secs / SECONDS_PER_HOUR;
        secs = secs % SECONDS_PER_HOUR;
        minute = secs / SECONDS_PER_MINUTE;
        second = secs % SECONDS_PER_MINUTE;
    }

    function isValidDate(uint year, uint month, uint day)
        internal
        pure
        returns (bool valid)
    {
        if (year >= 1970 && month > 0 && month <= 12) {
            uint daysInMonth = _getDaysInMonth(year, month);
            if (day > 0 && day <= daysInMonth) {
                valid = true;
            }
        }
    }

    function isValidDateTime(
        uint year,
        uint month,
        uint day,
        uint hour,
        uint minute,
        uint second
    ) internal pure returns (bool valid) {
        if (isValidDate(year, month, day)) {
            if (hour < 24 && minute < 60 && second < 60) {
                valid = true;
            }
        }
    }

    function isLeapYear(uint timestamp) internal pure returns (bool leapYear) {
        (uint year, , ) = _daysToDate(timestamp / SECONDS_PER_DAY);
        leapYear = _isLeapYear(year);
    }

    function _isLeapYear(uint year) internal pure returns (bool leapYear) {
        leapYear = ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
    }

    function isWeekDay(uint timestamp) internal pure returns (bool weekDay) {
        weekDay = getDayOfWeek(timestamp) <= DOW_FRI;
    }

    function isWeekEnd(uint timestamp) internal pure returns (bool weekEnd) {
        weekEnd = getDayOfWeek(timestamp) >= DOW_SAT;
    }

    function getDaysInMonth(uint timestamp)
        internal
        pure
        returns (uint daysInMonth)
    {
        (uint year, uint month, ) = _daysToDate(timestamp / SECONDS_PER_DAY);
        daysInMonth = _getDaysInMonth(year, month);
    }

    function _getDaysInMonth(uint year, uint month)
        internal
        pure
        returns (uint daysInMonth)
    {
        if (
            month == 1 ||
            month == 3 ||
            month == 5 ||
            month == 7 ||
            month == 8 ||
            month == 10 ||
            month == 12
        ) {
            daysInMonth = 31;
        } else if (month != 2) {
            daysInMonth = 30;
        } else {
            daysInMonth = _isLeapYear(year) ? 29 : 28;
        }
    }

    // 1 = Monday, 7 = Sunday
    function getDayOfWeek(uint timestamp)
        internal
        pure
        returns (uint dayOfWeek)
    {
        uint _days = timestamp / SECONDS_PER_DAY;
        dayOfWeek = ((_days + 3) % 7) + 1;
    }

    function getYear(uint timestamp) internal pure returns (uint year) {
        (year, , ) = _daysToDate(timestamp / SECONDS_PER_DAY);
    }

    function getMonth(uint timestamp) internal pure returns (uint month) {
        (, month, ) = _daysToDate(timestamp / SECONDS_PER_DAY);
    }

    function getDay(uint timestamp) internal pure returns (uint day) {
        (, , day) = _daysToDate(timestamp / SECONDS_PER_DAY);
    }

    function getHour(uint timestamp) internal pure returns (uint hour) {
        uint secs = timestamp % SECONDS_PER_DAY;
        hour = secs / SECONDS_PER_HOUR;
    }

    function getMinute(uint timestamp) internal pure returns (uint minute) {
        uint secs = timestamp % SECONDS_PER_HOUR;
        minute = secs / SECONDS_PER_MINUTE;
    }

    function getSecond(uint timestamp) internal pure returns (uint second) {
        second = timestamp % SECONDS_PER_MINUTE;
    }

    function addYears(uint timestamp, uint _years)
        internal
        pure
        returns (uint newTimestamp)
    {
        (uint year, uint month, uint day) = _daysToDate(
            timestamp / SECONDS_PER_DAY
        );
        year += _years;
        uint daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp =
            _daysFromDate(year, month, day) *
            SECONDS_PER_DAY +
            (timestamp % SECONDS_PER_DAY);
        require(newTimestamp >= timestamp);
    }

    function addMonths(uint timestamp, uint _months)
        internal
        pure
        returns (uint newTimestamp)
    {
        (uint year, uint month, uint day) = _daysToDate(
            timestamp / SECONDS_PER_DAY
        );
        month += _months;
        year += (month - 1) / 12;
        month = ((month - 1) % 12) + 1;
        uint daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp =
            _daysFromDate(year, month, day) *
            SECONDS_PER_DAY +
            (timestamp % SECONDS_PER_DAY);
        require(newTimestamp >= timestamp);
    }

    function addDays(uint timestamp, uint _days)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp + _days * SECONDS_PER_DAY;
        require(newTimestamp >= timestamp);
    }

    function addHours(uint timestamp, uint _hours)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp + _hours * SECONDS_PER_HOUR;
        require(newTimestamp >= timestamp);
    }

    function addMinutes(uint timestamp, uint _minutes)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp + _minutes * SECONDS_PER_MINUTE;
        require(newTimestamp >= timestamp);
    }

    function addSeconds(uint timestamp, uint _seconds)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp + _seconds;
        require(newTimestamp >= timestamp);
    }

    function subYears(uint timestamp, uint _years)
        internal
        pure
        returns (uint newTimestamp)
    {
        (uint year, uint month, uint day) = _daysToDate(
            timestamp / SECONDS_PER_DAY
        );
        year -= _years;
        uint daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp =
            _daysFromDate(year, month, day) *
            SECONDS_PER_DAY +
            (timestamp % SECONDS_PER_DAY);
        require(newTimestamp <= timestamp);
    }

    function subMonths(uint timestamp, uint _months)
        internal
        pure
        returns (uint newTimestamp)
    {
        (uint year, uint month, uint day) = _daysToDate(
            timestamp / SECONDS_PER_DAY
        );
        uint yearMonth = year * 12 + (month - 1) - _months;
        year = yearMonth / 12;
        month = (yearMonth % 12) + 1;
        uint daysInMonth = _getDaysInMonth(year, month);
        if (day > daysInMonth) {
            day = daysInMonth;
        }
        newTimestamp =
            _daysFromDate(year, month, day) *
            SECONDS_PER_DAY +
            (timestamp % SECONDS_PER_DAY);
        require(newTimestamp <= timestamp);
    }

    function subDays(uint timestamp, uint _days)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp - _days * SECONDS_PER_DAY;
        require(newTimestamp <= timestamp);
    }

    function subHours(uint timestamp, uint _hours)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp - _hours * SECONDS_PER_HOUR;
        require(newTimestamp <= timestamp);
    }

    function subMinutes(uint timestamp, uint _minutes)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp - _minutes * SECONDS_PER_MINUTE;
        require(newTimestamp <= timestamp);
    }

    function subSeconds(uint timestamp, uint _seconds)
        internal
        pure
        returns (uint newTimestamp)
    {
        newTimestamp = timestamp - _seconds;
        require(newTimestamp <= timestamp);
    }

    function diffYears(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _years)
    {
        require(fromTimestamp <= toTimestamp);
        (uint fromYear, , ) = _daysToDate(fromTimestamp / SECONDS_PER_DAY);
        (uint toYear, , ) = _daysToDate(toTimestamp / SECONDS_PER_DAY);
        _years = toYear - fromYear;
    }

    function diffMonths(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _months)
    {
        require(fromTimestamp <= toTimestamp);
        (uint fromYear, uint fromMonth, ) = _daysToDate(
            fromTimestamp / SECONDS_PER_DAY
        );
        (uint toYear, uint toMonth, ) = _daysToDate(
            toTimestamp / SECONDS_PER_DAY
        );
        _months = toYear * 12 + toMonth - fromYear * 12 - fromMonth;
    }

    function diffDays(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _days)
    {
        require(fromTimestamp <= toTimestamp);
        _days = (toTimestamp - fromTimestamp) / SECONDS_PER_DAY;
    }

    function diffHours(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _hours)
    {
        require(fromTimestamp <= toTimestamp);
        _hours = (toTimestamp - fromTimestamp) / SECONDS_PER_HOUR;
    }

    function diffMinutes(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _minutes)
    {
        require(fromTimestamp <= toTimestamp);
        _minutes = (toTimestamp - fromTimestamp) / SECONDS_PER_MINUTE;
    }

    function diffSeconds(uint fromTimestamp, uint toTimestamp)
        internal
        pure
        returns (uint _seconds)
    {
        require(fromTimestamp <= toTimestamp);
        _seconds = toTimestamp - fromTimestamp;
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

// Libraries
import { SafeCast } from "@openzeppelin/contracts/utils/math/SafeCast.sol";
import { Math } from "@openzeppelin/contracts/utils/math/Math.sol";
import "./WadRayMath.sol";

/**
 * @dev Utility library for uint256 numbers
 *
 * @author [email protected]
 */
library NumbersLib {
    using WadRayMath for uint256;

    /**
     * @dev It represents 100% with 2 decimal places.
     */
    uint16 internal constant PCT_100 = 10000;

    function percentFactor(uint256 decimals) internal pure returns (uint256) {
        return 100 * (10**decimals);
    }

    /**
     * @notice Returns a percentage value of a number.
     * @param self The number to get a percentage of.
     * @param percentage The percentage value to calculate with 2 decimal places (10000 = 100%).
     */
    function percent(uint256 self, uint16 percentage)
        internal
        pure
        returns (uint256)
    {
        return percent(self, percentage, 2);
    }

    /**
     * @notice Returns a percentage value of a number.
     * @param self The number to get a percentage of.
     * @param percentage The percentage value to calculate with.
     * @param decimals The number of decimals the percentage value is in.
     */
    function percent(uint256 self, uint256 percentage, uint256 decimals)
        internal
        pure
        returns (uint256)
    {
        return (self * percentage) / percentFactor(decimals);
    }

    /**
     * @notice it returns the absolute number of a specified parameter
     * @param self the number to be returned in it's absolute
     * @return the absolute number
     */
    function abs(int256 self) internal pure returns (uint256) {
        return self >= 0 ? uint256(self) : uint256(-1 * self);
    }

    /**
     * @notice Returns a ratio percentage of {num1} to {num2}.
     * @dev Returned value is type uint16.
     * @param num1 The number used to get the ratio for.
     * @param num2 The number used to get the ratio from.
     * @return Ratio percentage with 2 decimal places (10000 = 100%).
     */
    function ratioOf(uint256 num1, uint256 num2)
        internal
        pure
        returns (uint16)
    {
        return SafeCast.toUint16(ratioOf(num1, num2, 2));
    }

    /**
     * @notice Returns a ratio percentage of {num1} to {num2}.
     * @param num1 The number used to get the ratio for.
     * @param num2 The number used to get the ratio from.
     * @param decimals The number of decimals the percentage value is returned in.
     * @return Ratio percentage value.
     */
    function ratioOf(uint256 num1, uint256 num2, uint256 decimals)
        internal
        pure
        returns (uint256)
    {
        if (num2 == 0) return 0;
        return (num1 * percentFactor(decimals)) / num2;
    }

    /**
     * @notice Calculates the payment amount for a cycle duration.
     *  The formula is calculated based on the standard Estimated Monthly Installment (https://en.wikipedia.org/wiki/Equated_monthly_installment)
     *  EMI = [P x R x (1+R)^N]/[(1+R)^N-1]
     * @param principal The starting amount that is owed on the loan.
     * @param loanDuration The length of the loan.
     * @param cycleDuration The length of the loan's payment cycle.
     * @param apr The annual percentage rate of the loan.
     */
    function pmt(
        uint256 principal,
        uint32 loanDuration,
        uint32 cycleDuration,
        uint16 apr,
        uint256 daysInYear
    ) internal pure returns (uint256) {
        require(
            loanDuration >= cycleDuration,
            "PMT: cycle duration < loan duration"
        );
        if (apr == 0)
            return
                Math.mulDiv(
                    principal,
                    cycleDuration,
                    loanDuration,
                    Math.Rounding.Up
                );

        // Number of payment cycles for the duration of the loan
        uint256 n = Math.ceilDiv(loanDuration, cycleDuration);

        uint256 one = WadRayMath.wad();
        uint256 r = WadRayMath.pctToWad(apr).wadMul(cycleDuration).wadDiv(
            daysInYear
        );
        uint256 exp = (one + r).wadPow(n);
        uint256 numerator = principal.wadMul(r).wadMul(exp);
        uint256 denominator = exp - one;

        return numerator.wadDiv(denominator);
    }
}

pragma solidity >=0.8.0 <0.9.0;

// SPDX-License-Identifier: MIT

// Libraries
import "./NumbersLib.sol";
import "@openzeppelin/contracts/utils/math/Math.sol";
import { Bid } from "../TellerV2Storage.sol";
import { BokkyPooBahsDateTimeLibrary as BPBDTL } from "./DateTimeLib.sol";

enum PaymentType {
    EMI,
    Bullet
}

enum PaymentCycleType {
    Seconds,
    Monthly
}

library V2Calculations {
    using NumbersLib for uint256;

    /**
     * @notice Returns the timestamp of the last payment made for a loan.
     * @param _bid The loan bid struct to get the timestamp for.
     */
    function lastRepaidTimestamp(Bid storage _bid)
        internal
        view
        returns (uint32)
    {
        return
            _bid.loanDetails.lastRepaidTimestamp == 0
                ? _bid.loanDetails.acceptedTimestamp
                : _bid.loanDetails.lastRepaidTimestamp;
    }

    /**
     * @notice Calculates the amount owed for a loan.
     * @param _bid The loan bid struct to get the owed amount for.
     * @param _timestamp The timestamp at which to get the owed amount at.
     * @param _paymentCycleType The payment cycle type of the loan (Seconds or Monthly).
     */
    function calculateAmountOwed(
        Bid storage _bid,
        uint256 _timestamp,
        PaymentCycleType _paymentCycleType,
        uint32 _paymentCycleDuration
    )
        public
        view
        returns (
            uint256 owedPrincipal_,
            uint256 duePrincipal_,
            uint256 interest_
        )
    {
        // Total principal left to pay
        return
            calculateAmountOwed(
                _bid,
                lastRepaidTimestamp(_bid),
                _timestamp,
                _paymentCycleType,
                _paymentCycleDuration
            );
    }

    function calculateAmountOwed(
        Bid storage _bid,
        uint256 _lastRepaidTimestamp,
        uint256 _timestamp,
        PaymentCycleType _paymentCycleType,
        uint32 _paymentCycleDuration
    )
        public
        view
        returns (
            uint256 owedPrincipal_,
            uint256 duePrincipal_,
            uint256 interest_
        )
    {
        owedPrincipal_ =
            _bid.loanDetails.principal -
            _bid.loanDetails.totalRepaid.principal;

         uint256 owedTime = _timestamp - uint256(_lastRepaidTimestamp);

        {
         uint256 daysInYear = _paymentCycleType == PaymentCycleType.Monthly
            ? 360 days
            : 365 days;

         uint256 interestOwedInAYear = owedPrincipal_.percent(_bid.terms.APR, 2);
       
         interest_ = (interestOwedInAYear * owedTime) / daysInYear;
        }


        bool isLastPaymentCycle;
        {
            uint256 lastPaymentCycleDuration = _bid.loanDetails.loanDuration %
                _paymentCycleDuration;
            if (lastPaymentCycleDuration == 0) {
                lastPaymentCycleDuration = _paymentCycleDuration;
            }

            uint256 endDate = uint256(_bid.loanDetails.acceptedTimestamp) +
                uint256(_bid.loanDetails.loanDuration);
            uint256 lastPaymentCycleStart = endDate -
                uint256(lastPaymentCycleDuration);

            isLastPaymentCycle =
                uint256(_timestamp) > lastPaymentCycleStart ||
                owedPrincipal_ + interest_ <= _bid.terms.paymentCycleAmount;
        }

        if (_bid.paymentType == PaymentType.Bullet) {
            if (isLastPaymentCycle) {
                duePrincipal_ = owedPrincipal_;
            }
        } else {
            // Default to PaymentType.EMI
            // Max payable amount in a cycle
            // NOTE: the last cycle could have less than the calculated payment amount

            //the amount owed for the cycle should never exceed the current payment cycle amount  so we use min here 
            uint256 owedAmountForCycle = Math.min(  ((_bid.terms.paymentCycleAmount  * owedTime)  ) /
                    _paymentCycleDuration , _bid.terms.paymentCycleAmount+interest_ ) ;

            uint256 owedAmount = isLastPaymentCycle
                ? owedPrincipal_ + interest_
                : owedAmountForCycle  ;

            duePrincipal_ = Math.min(owedAmount - interest_, owedPrincipal_);
        }
    }

    /**
     * @notice Calculates the amount owed for a loan for the next payment cycle.
     * @param _type The payment type of the loan.
     * @param _cycleType The cycle type set for the loan. (Seconds or Monthly)
     * @param _principal The starting amount that is owed on the loan.
     * @param _duration The length of the loan.
     * @param _paymentCycle The length of the loan's payment cycle.
     * @param _apr The annual percentage rate of the loan.
     */
    function calculatePaymentCycleAmount(
        PaymentType _type,
        PaymentCycleType _cycleType,
        uint256 _principal,
        uint32 _duration,
        uint32 _paymentCycle,
        uint16 _apr
    ) public view returns (uint256) {
        uint256 daysInYear = _cycleType == PaymentCycleType.Monthly
            ? 360 days
            : 365 days;
        if (_type == PaymentType.Bullet) {
            return
                _principal.percent(_apr).percent(
                    uint256(_paymentCycle).ratioOf(daysInYear, 10),
                    10
                );
        }
        // Default to PaymentType.EMI
        return
            NumbersLib.pmt(
                _principal,
                _duration,
                _paymentCycle,
                _apr,
                daysInYear
            );
    }

    function calculateNextDueDate(
        uint32 _acceptedTimestamp,
        uint32 _paymentCycle,
        uint32 _loanDuration,
        uint32 _lastRepaidTimestamp,
        PaymentCycleType _bidPaymentCycleType
    ) public view returns (uint32 dueDate_) {
        // Calculate due date if payment cycle is set to monthly
        if (_bidPaymentCycleType == PaymentCycleType.Monthly) {
            // Calculate the cycle number the last repayment was made
            uint256 lastPaymentCycle = BPBDTL.diffMonths(
                _acceptedTimestamp,
                _lastRepaidTimestamp
            );
            if (
                BPBDTL.getDay(_lastRepaidTimestamp) >
                BPBDTL.getDay(_acceptedTimestamp)
            ) {
                lastPaymentCycle += 2;
            } else {
                lastPaymentCycle += 1;
            }

            dueDate_ = uint32(
                BPBDTL.addMonths(_acceptedTimestamp, lastPaymentCycle)
            );
        } else if (_bidPaymentCycleType == PaymentCycleType.Seconds) {
            // Start with the original due date being 1 payment cycle since bid was accepted
            dueDate_ = _acceptedTimestamp + _paymentCycle;
            // Calculate the cycle number the last repayment was made
            uint32 delta = _lastRepaidTimestamp - _acceptedTimestamp;
            if (delta > 0) {
                uint32 repaymentCycle = uint32(
                    Math.ceilDiv(delta, _paymentCycle)
                );
                dueDate_ += (repaymentCycle * _paymentCycle);
            }
        }

        uint32 endOfLoan = _acceptedTimestamp + _loanDuration;
        //if we are in the last payment cycle, the next due date is the end of loan duration
        if (dueDate_ > endOfLoan) {
            dueDate_ = endOfLoan;
        }
    }
}

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "@openzeppelin/contracts/utils/math/SafeCast.sol";
import "@openzeppelin/contracts/utils/math/SafeMath.sol";

/**
 * @title WadRayMath library
 * @author Multiplier Finance
 * @dev Provides mul and div function for wads (decimal numbers with 18 digits precision) and rays (decimals with 27 digits)
 */
library WadRayMath {
    using SafeMath for uint256;

    uint256 internal constant WAD = 1e18;
    uint256 internal constant halfWAD = WAD / 2;

    uint256 internal constant RAY = 1e27;
    uint256 internal constant halfRAY = RAY / 2;

    uint256 internal constant WAD_RAY_RATIO = 1e9;
    uint256 internal constant PCT_WAD_RATIO = 1e14;
    uint256 internal constant PCT_RAY_RATIO = 1e23;

    function ray() internal pure returns (uint256) {
        return RAY;
    }

    function wad() internal pure returns (uint256) {
        return WAD;
    }

    function halfRay() internal pure returns (uint256) {
        return halfRAY;
    }

    function halfWad() internal pure returns (uint256) {
        return halfWAD;
    }

    function wadMul(uint256 a, uint256 b) internal pure returns (uint256) {
        return halfWAD.add(a.mul(b)).div(WAD);
    }

    function wadDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 halfB = b / 2;

        return halfB.add(a.mul(WAD)).div(b);
    }

    function rayMul(uint256 a, uint256 b) internal pure returns (uint256) {
        return halfRAY.add(a.mul(b)).div(RAY);
    }

    function rayDiv(uint256 a, uint256 b) internal pure returns (uint256) {
        uint256 halfB = b / 2;

        return halfB.add(a.mul(RAY)).div(b);
    }

    function rayToWad(uint256 a) internal pure returns (uint256) {
        uint256 halfRatio = WAD_RAY_RATIO / 2;

        return halfRatio.add(a).div(WAD_RAY_RATIO);
    }

    function rayToPct(uint256 a) internal pure returns (uint16) {
        uint256 halfRatio = PCT_RAY_RATIO / 2;

        uint256 val = halfRatio.add(a).div(PCT_RAY_RATIO);
        return SafeCast.toUint16(val);
    }

    function wadToPct(uint256 a) internal pure returns (uint16) {
        uint256 halfRatio = PCT_WAD_RATIO / 2;

        uint256 val = halfRatio.add(a).div(PCT_WAD_RATIO);
        return SafeCast.toUint16(val);
    }

    function wadToRay(uint256 a) internal pure returns (uint256) {
        return a.mul(WAD_RAY_RATIO);
    }

    function pctToRay(uint16 a) internal pure returns (uint256) {
        return uint256(a).mul(RAY).div(1e4);
    }

    function pctToWad(uint16 a) internal pure returns (uint256) {
        return uint256(a).mul(WAD).div(1e4);
    }

    /**
     * @dev calculates base^duration. The code uses the ModExp precompile
     * @return z base^duration, in ray
     */
    function rayPow(uint256 x, uint256 n) internal pure returns (uint256) {
        return _pow(x, n, RAY, rayMul);
    }

    function wadPow(uint256 x, uint256 n) internal pure returns (uint256) {
        return _pow(x, n, WAD, wadMul);
    }

    function _pow(
        uint256 x,
        uint256 n,
        uint256 p,
        function(uint256, uint256) internal pure returns (uint256) mul
    ) internal pure returns (uint256 z) {
        z = n % 2 != 0 ? x : p;

        for (n /= 2; n != 0; n /= 2) {
            x = mul(x, x);

            if (n % 2 != 0) {
                z = mul(z, x);
            }
        }
    }
}

pragma solidity >=0.8.0 <0.9.0;
// SPDX-License-Identifier: MIT

import { IMarketRegistry } from "./interfaces/IMarketRegistry.sol";
import "./interfaces/IEscrowVault.sol";
import "./interfaces/IReputationManager.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "./interfaces/ICollateralManager.sol";
import { PaymentType, PaymentCycleType } from "./libraries/V2Calculations.sol";
import "./interfaces/ILenderManager.sol";

enum BidState {
    NONEXISTENT,
    PENDING,
    CANCELLED,
    ACCEPTED,
    PAID,
    LIQUIDATED,
    CLOSED
}

/**
 * @notice Represents a total amount for a payment.
 * @param principal Amount that counts towards the principal.
 * @param interest  Amount that counts toward interest.
 */
struct Payment {
    uint256 principal;
    uint256 interest;
}

/**
 * @notice Details about a loan request.
 * @param borrower Account address who is requesting a loan.
 * @param receiver Account address who will receive the loan amount.
 * @param lender Account address who accepted and funded the loan request.
 * @param marketplaceId ID of the marketplace the bid was submitted to.
 * @param metadataURI ID of off chain metadata to find additional information of the loan request.
 * @param loanDetails Struct of the specific loan details.
 * @param terms Struct of the loan request terms.
 * @param state Represents the current state of the loan.
 */
struct Bid {
    address borrower;
    address receiver;
    address lender; // if this is the LenderManager address, we use that .owner() as source of truth
    uint256 marketplaceId;
    bytes32 _metadataURI; // DEPRECATED
    LoanDetails loanDetails;
    Terms terms;
    BidState state;
    PaymentType paymentType;
}

/**
 * @notice Details about the loan.
 * @param lendingToken The token address for the loan.
 * @param principal The amount of tokens initially lent out.
 * @param totalRepaid Payment struct that represents the total principal and interest amount repaid.
 * @param timestamp Timestamp, in seconds, of when the bid was submitted by the borrower.
 * @param acceptedTimestamp Timestamp, in seconds, of when the bid was accepted by the lender.
 * @param lastRepaidTimestamp Timestamp, in seconds, of when the last payment was made
 * @param loanDuration The duration of the loan.
 */
struct LoanDetails {
    IERC20 lendingToken;
    uint256 principal;
    Payment totalRepaid;
    uint32 timestamp;
    uint32 acceptedTimestamp;
    uint32 lastRepaidTimestamp;
    uint32 loanDuration;
}

/**
 * @notice Information on the terms of a loan request
 * @param paymentCycleAmount Value of tokens expected to be repaid every payment cycle.
 * @param paymentCycle Duration, in seconds, of how often a payment must be made.
 * @param APR Annual percentage rating to be applied on repayments. (10000 == 100%)
 */
struct Terms {
    uint256 paymentCycleAmount;
    uint32 paymentCycle;
    uint16 APR;
}

abstract contract TellerV2Storage_G0 {
    /** Storage Variables */

    // Current number of bids.
    uint256 public bidId;

    // Mapping of bidId to bid information.
    mapping(uint256 => Bid) public bids;

    // Mapping of borrowers to borrower requests.
    mapping(address => uint256[]) public borrowerBids;

    // Mapping of volume filled by lenders.
    mapping(address => uint256) public __lenderVolumeFilled; // DEPRECIATED

    // Volume filled by all lenders.
    uint256 public __totalVolumeFilled; // DEPRECIATED

    // List of allowed lending tokens
    EnumerableSet.AddressSet internal __lendingTokensSet; // DEPRECATED

    IMarketRegistry public marketRegistry;
    IReputationManager public reputationManager;

    // Mapping of borrowers to borrower requests.
    mapping(address => EnumerableSet.UintSet) internal _borrowerBidsActive;

    mapping(uint256 => uint32) public bidDefaultDuration;
    mapping(uint256 => uint32) public bidExpirationTime;

    // Mapping of volume filled by lenders.
    // Asset address => Lender address => Volume amount
    mapping(address => mapping(address => uint256)) public lenderVolumeFilled;

    // Volume filled by all lenders.
    // Asset address => Volume amount
    mapping(address => uint256) public totalVolumeFilled;

    uint256 public version;

    // Mapping of metadataURIs by bidIds.
    // Bid Id => metadataURI string
    mapping(uint256 => string) public uris;
}

abstract contract TellerV2Storage_G1 is TellerV2Storage_G0 {
    // market ID => trusted forwarder
    mapping(uint256 => address) internal _trustedMarketForwarders;
    // trusted forwarder => set of pre-approved senders
    mapping(address => EnumerableSet.AddressSet)
        internal _approvedForwarderSenders;
}

abstract contract TellerV2Storage_G2 is TellerV2Storage_G1 {
    address public lenderCommitmentForwarder;
}

abstract contract TellerV2Storage_G3 is TellerV2Storage_G2 {
    ICollateralManager public collateralManager;
}

abstract contract TellerV2Storage_G4 is TellerV2Storage_G3 {
    // Address of the lender manager contract
    ILenderManager public lenderManager;
    // BidId to payment cycle type (custom or monthly)
    mapping(uint256 => PaymentCycleType) public bidPaymentCycleType;
}

abstract contract TellerV2Storage_G5 is TellerV2Storage_G4 {
    // Address of the lender manager contract
    IEscrowVault public escrowVault;
}

abstract contract TellerV2Storage_G6 is TellerV2Storage_G5 {
    mapping(uint256 => address) public repaymentListenerForBid;
}

abstract contract TellerV2Storage_G7 is TellerV2Storage_G6 {
    mapping(address => bool) private  __pauserRoleBearer;
    bool private __liquidationsPaused; 
}

abstract contract TellerV2Storage_G8 is TellerV2Storage_G7 {
    address  protocolFeeRecipient;  
}

abstract contract TellerV2Storage is TellerV2Storage_G8 {}

pragma solidity >=0.8.0 <0.9.0;
// SPDX-License-Identifier: MIT

// A representation of an empty/uninitialized UUID.
bytes32 constant EMPTY_UUID = 0;

{
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "metadata": {
    "useLiteralContent": true
  }
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"address","name":"_tellerV2","type":"address"},{"internalType":"address","name":"_marketRegistry","type":"address"},{"internalType":"address","name":"_collateralManager","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"bidId","type":"uint256"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"ClaimedRewards","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"},{"indexed":false,"internalType":"address","name":"allocator","type":"address"},{"indexed":false,"internalType":"uint256","name":"marketId","type":"uint256"}],"name":"CreatedAllocation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"DecreasedAllocation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"}],"name":"DeletedAllocation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount","type":"uint256"}],"name":"IncreasedAllocation","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"allocationId","type":"uint256"}],"name":"UpdatedAllocation","type":"event"},{"inputs":[{"components":[{"internalType":"address","name":"allocator","type":"address"},{"internalType":"address","name":"rewardTokenAddress","type":"address"},{"internalType":"uint256","name":"rewardTokenAmount","type":"uint256"},{"internalType":"uint256","name":"marketId","type":"uint256"},{"internalType":"address","name":"requiredPrincipalTokenAddress","type":"address"},{"internalType":"address","name":"requiredCollateralTokenAddress","type":"address"},{"internalType":"uint256","name":"minimumCollateralPerPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"rewardPerLoanPrincipalAmount","type":"uint256"},{"internalType":"uint32","name":"bidStartTimeMin","type":"uint32"},{"internalType":"uint32","name":"bidStartTimeMax","type":"uint32"},{"internalType":"enum IMarketLiquidityRewards.AllocationStrategy","name":"allocationStrategy","type":"uint8"}],"internalType":"struct IMarketLiquidityRewards.RewardAllocation","name":"_allocation","type":"tuple"}],"name":"allocateRewards","outputs":[{"internalType":"uint256","name":"allocationId_","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"allocatedRewards","outputs":[{"internalType":"address","name":"allocator","type":"address"},{"internalType":"address","name":"rewardTokenAddress","type":"address"},{"internalType":"uint256","name":"rewardTokenAmount","type":"uint256"},{"internalType":"uint256","name":"marketId","type":"uint256"},{"internalType":"address","name":"requiredPrincipalTokenAddress","type":"address"},{"internalType":"address","name":"requiredCollateralTokenAddress","type":"address"},{"internalType":"uint256","name":"minimumCollateralPerPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"rewardPerLoanPrincipalAmount","type":"uint256"},{"internalType":"uint32","name":"bidStartTimeMin","type":"uint32"},{"internalType":"uint32","name":"bidStartTimeMax","type":"uint32"},{"internalType":"enum IMarketLiquidityRewards.AllocationStrategy","name":"allocationStrategy","type":"uint8"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocationId","type":"uint256"},{"internalType":"uint256","name":"_bidId","type":"uint256"}],"name":"claimRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocationId","type":"uint256"},{"internalType":"uint256","name":"_tokenAmount","type":"uint256"}],"name":"deallocateRewards","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocationId","type":"uint256"}],"name":"getRewardTokenAmount","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocationId","type":"uint256"},{"internalType":"uint256","name":"_tokenAmount","type":"uint256"}],"name":"increaseAllocationAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"rewardClaimedForBid","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"_allocationId","type":"uint256"},{"internalType":"uint256","name":"_minimumCollateralPerPrincipalAmount","type":"uint256"},{"internalType":"uint256","name":"_rewardPerLoanPrincipalAmount","type":"uint256"},{"internalType":"uint32","name":"_bidStartTimeMin","type":"uint32"},{"internalType":"uint32","name":"_bidStartTimeMax","type":"uint32"}],"name":"updateAllocation","outputs":[],"stateMutability":"nonpayable","type":"function"}]

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000000000000000000000000f7b14778035feaf44540a0bc1d4ed859bcb28229000000000000000000000000caed03f8c7410f327f7e535bd7a339ee4b14ab9b0000000000000000000000006455f2e1ccb14bd0b675a309276fb5333dec524f

-----Decoded View---------------
Arg [0] : _tellerV2 (address): 0xf7B14778035fEAF44540A0bC1D4ED859bCB28229
Arg [1] : _marketRegistry (address): 0xCAed03f8c7410F327F7E535bd7a339ee4b14Ab9b
Arg [2] : _collateralManager (address): 0x6455F2E1CCb14bd0b675A309276FB5333Dec524f

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000f7b14778035feaf44540a0bc1d4ed859bcb28229
Arg [1] : 000000000000000000000000caed03f8c7410f327f7e535bd7a339ee4b14ab9b
Arg [2] : 0000000000000000000000006455f2e1ccb14bd0b675a309276fb5333dec524f