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// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/utils/introspection/ERC165.sol";
import "@openzeppelin/contracts/utils/Context.sol";
import "@openzeppelin/contracts/security/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import "@openzeppelin/contracts/utils/math/SafeCast.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

import "./modules/Ownable/Ownable.sol";
import "./modules/Upgradeable/Upgradeable.sol";
import "./TransferHelper.sol";
import "./IAvatarsEscrow.sol";
import "./IAvatarsRental.sol";
import "./IAvatars_ERC721.sol";
import "./AvatarsEscrowStorage.sol";

contract AvatarsEscrow is Context, ERC165, IAvatarsEscrow, Ownable, ReentrancyGuard, Upgradeable {
    using SafeCast for uint256;
    using ECDSA for bytes32;
    using EnumerableSet for EnumerableSet.UintSet;

    // ======== Admin functions ========

    constructor(address _rewardTokenAddress, address _avatars) {
        require(_rewardTokenAddress != address(0), "E0"); // E0: addr err
        require(address(_avatars) != address(0), "E0");
        AvatarsEscrowStorage.layout().rewardTokenAddress = _rewardTokenAddress;
        AvatarsEscrowStorage.layout().Avatars_ERC721 = IAvatars_ERC721(_avatars);
    }

    // Set a rewards schedule
    // rate is in wei per second for all users
    // This must be called AFTER some avatars are staked (or ensure at least 1 avatar is staked before the start timestamp)
    function setRewards(uint32 _start, uint32 _end, uint96 _rate) external onlyOwner checkForUpgrade {
        require(_start <= _end, "E1"); // E1: Incorrect input
        // some safeguard, value TBD. (2b over 5 years is 12.68 per sec)
        require(_rate > 0.03 ether && _rate < 30 ether, "E2"); // E2: Rate incorrect
        require(AvatarsEscrowStorage.layout().rewardTokenAddress != address(0), "E3"); // E3: Rewards token not set
        require(
            block.timestamp.toUint32() < AvatarsEscrowStorage.layout().rewardsPeriod.start
                || block.timestamp.toUint32() > AvatarsEscrowStorage.layout().rewardsPeriod.end,
            "E4"
        ); // E4: Rewards already set

        AvatarsEscrowStorage.layout().rewardsPeriod.start = _start;
        AvatarsEscrowStorage.layout().rewardsPeriod.end = _end;

        AvatarsEscrowStorage.layout().rewardsPerWeight.lastUpdated = _start;
        AvatarsEscrowStorage.layout().rewardsPerWeight.rate = _rate;

        emit RewardsSet(_start, _end, _rate);
    }

    function setWeight(uint256[] calldata _tokenIds, uint256[] calldata _weights) external onlyOwner checkForUpgrade {
        require(_tokenIds.length == _weights.length, "E6");
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            uint256 tokenId = _tokenIds[i];
            require(AvatarsEscrowStorage.layout().avatarInfo[tokenId].weight == 0, "E8");
            AvatarsEscrowStorage.layout().avatarInfo[tokenId].weight = _weights[i].toUint16();
        }
    }

    function setSigner(address _signer) external onlyOwner checkForUpgrade {
        AvatarsEscrowStorage.layout().signer = _signer;
    }

    function setRentalContract(IAvatarsRental _rental) external onlyOwner checkForUpgrade {
        require(_rental.supportsInterface(type(IAvatarsRental).interfaceId), "E0");
        AvatarsEscrowStorage.layout().AvatarsRental = _rental;
    }

    function setRewardTokenAddress(address _rewardTokenAddress) external onlyOwner checkForUpgrade {
        AvatarsEscrowStorage.layout().rewardTokenAddress = _rewardTokenAddress;
    }

    function setAvatarsERC721(IAvatars_ERC721 _avatars) external onlyOwner checkForUpgrade {
        AvatarsEscrowStorage.layout().Avatars_ERC721 = _avatars;
    }

    function setAvatarsRental(IAvatarsRental _rental) external onlyOwner checkForUpgrade {
        AvatarsEscrowStorage.layout().AvatarsRental = _rental;
    }

    // ======== Public functions ========

    // Stake avatars for a first time. You may optionally stake to a different wallet. Ownership will be transferred to the stakeTo address.
    // Initial weights passed as input parameters, which are secured by a dev signature. weight = 60003 - 3 * rank
    // When you stake you can set rental conditions for all of them.
    // Initialized and uninitialized stake can be mixed into one tx using this method.
    // If you set rentalPerDay to 0 and rentableUntil to some time in the future, then anyone can rent for free
    //    until the rentableUntil timestamp with no way of backing out
    function initialStake(
        uint256[] calldata _tokenIds,
        uint256[] calldata _weights,
        address _stakeTo,
        uint16 _deposit,
        uint16 _rentalPerDay,
        uint16 _minRentDays,
        uint32 _rentableUntil,
        uint32 _maxTimestamp,
        bytes calldata _signature
    ) external nonReentrant checkForUpgrade {
        require(uint256(_deposit) <= uint256(_rentalPerDay) * (uint256(_minRentDays) + 1), "ER"); // ER: Rental rate incorrect
        // security measure against input length attack
        require(_tokenIds.length == _weights.length, "E6"); // E6: Input length mismatch
        require(block.timestamp <= _maxTimestamp, "EX"); // EX: Signature expired
        // verifying signature here is much cheaper than verifying merkle root
        require(
            _verifySignerSignature(
                keccak256(abi.encode(_tokenIds, _weights, _msgSender(), _maxTimestamp, address(this))), _signature
            ),
            "E7"
        ); // E7: Invalid signature
        // ensure stakeTo is EOA or ERC721Receiver to avoid token lockup
        _ensureEOAorERC721Receiver(_stakeTo);
        require(_stakeTo != address(this), "ES"); // ES: Stake to escrow

        uint256 totalWeights = 0;
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            {
                // scope to avoid stack too deep errors
                uint256 tokenId = _tokenIds[i];
                uint256 _weight = AvatarsEscrowStorage.layout().avatarInfo[tokenId].weight;
                require(_weight == 0 || _weight == _weights[i], "E8"); // E8: Initialized weight cannot be changed
                require(AvatarsEscrowStorage.layout().Avatars_ERC721.ownerOf(tokenId) == _msgSender(), "E9"); // E9: Not your avatar
                AvatarsEscrowStorage.layout().Avatars_ERC721.safeTransferFrom(_msgSender(), address(this), tokenId);

                emit AvatarStaked(tokenId, _stakeTo);
            }
            AvatarsEscrowStorage.layout().avatarInfo[_tokenIds[i]] =
                AvatarInfo(_weights[i].toUint16(), _stakeTo, _deposit, _rentalPerDay, _minRentDays, _rentableUntil);
            AvatarsEscrowStorage.layout().userStakes[_stakeTo].add(_tokenIds[i]);
            totalWeights += _weights[i];
        }
        // update rewards
        _updateRewardsPerWeight(totalWeights.toUint32(), true);
        _updateUserRewards(_stakeTo, totalWeights.toUint32(), true);
    }

    // subsequent staking does not require dev signature
    function stake(
        uint256[] calldata _tokenIds,
        address _stakeTo,
        uint16 _deposit,
        uint16 _rentalPerDay,
        uint16 _minRentDays,
        uint32 _rentableUntil
    ) external nonReentrant checkForUpgrade {
        require(uint256(_deposit) <= uint256(_rentalPerDay) * (uint256(_minRentDays) + 1), "ER"); // ER: Rental rate incorrect
        // ensure stakeTo is EOA or ERC721Receiver to avoid token lockup
        _ensureEOAorERC721Receiver(_stakeTo);
        require(_stakeTo != address(this), "ES"); // ES: Stake to escrow

        uint256 totalWeights = 0;
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            uint256 tokenId = _tokenIds[i];
            uint16 _weight = AvatarsEscrowStorage.layout().avatarInfo[tokenId].weight;
            require(_weight != 0, "EA"); // EA: Weight not initialized
            require(AvatarsEscrowStorage.layout().Avatars_ERC721.ownerOf(tokenId) == _msgSender(), "E9"); // E9: Not your avatar
            AvatarsEscrowStorage.layout().Avatars_ERC721.safeTransferFrom(_msgSender(), address(this), tokenId);
            totalWeights += _weight;
            AvatarsEscrowStorage.layout().avatarInfo[tokenId] =
                AvatarInfo(_weight, _stakeTo, _deposit, _rentalPerDay, _minRentDays, _rentableUntil);
            AvatarsEscrowStorage.layout().userStakes[_stakeTo].add(tokenId);
            emit AvatarStaked(tokenId, _stakeTo);
        }
        // update rewards
        _updateRewardsPerWeight(totalWeights.toUint32(), true);
        _updateUserRewards(_stakeTo, totalWeights.toUint32(), true);
    }

    // Update rental conditions as long as therer's no ongoing rent.
    // setting rentableUntil to 0 makes the avatar unrentable.
    function updateRent(
        uint256[] calldata _tokenIds,
        uint16 _deposit,
        uint16 _rentalPerDay,
        uint16 _minRentDays,
        uint32 _rentableUntil
    ) external checkForUpgrade {
        require(uint256(_deposit) <= uint256(_rentalPerDay) * (uint256(_minRentDays) + 1), "ER"); // ER: Rental rate incorrect
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            uint256 tokenId = _tokenIds[i];
            AvatarInfo storage avatarInfo_ = AvatarsEscrowStorage.layout().avatarInfo[tokenId];
            require(avatarInfo_.weight != 0, "EA"); // EA: Weight not initialized
            require(
                AvatarsEscrowStorage.layout().Avatars_ERC721.ownerOf(tokenId) == address(this)
                    && avatarInfo_.owner == _msgSender(),
                "E9"
            ); // E9: Not your avatar
            require(!AvatarsEscrowStorage.layout().AvatarsRental.isRentActive(tokenId), "EB"); // EB: Ongoing rent
            avatarInfo_.deposit = _deposit;
            avatarInfo_.rentalPerDay = _rentalPerDay;
            avatarInfo_.minRentDays = _minRentDays;
            avatarInfo_.rentableUntil = _rentableUntil;
        }
    }

    // Extend rental period of ongoing rent
    function extendRentalPeriod(uint256 _tokenId, uint32 _rentableUntil) external checkForUpgrade {
        AvatarInfo storage avatarInfo_ = AvatarsEscrowStorage.layout().avatarInfo[_tokenId];
        require(avatarInfo_.weight != 0, "EA"); // EA: Weight not initialized
        require(
            AvatarsEscrowStorage.layout().Avatars_ERC721.ownerOf(_tokenId) == address(this)
                && avatarInfo_.owner == _msgSender(),
            "E9"
        ); // E9: Not your avatar
        avatarInfo_.rentableUntil = _rentableUntil;
    }

    function unstake(uint256[] calldata _tokenIds, address _unstakeTo) external nonReentrant checkForUpgrade {
        // ensure unstakeTo is EOA or ERC721Receiver to avoid token lockup
        _ensureEOAorERC721Receiver(_unstakeTo);
        require(_unstakeTo != address(this), "ES"); // ES: Unstake to escrow

        uint256 totalWeights = 0;
        for (uint256 i = 0; i < _tokenIds.length; i++) {
            uint256 tokenId = _tokenIds[i];
            require(AvatarsEscrowStorage.layout().avatarInfo[tokenId].owner == _msgSender(), "E9"); // E9: Not your avatar
            require(!AvatarsEscrowStorage.layout().AvatarsRental.isRentActive(tokenId), "EB"); // EB: Ongoing rent
            AvatarsEscrowStorage.layout().Avatars_ERC721.safeTransferFrom(address(this), _unstakeTo, tokenId);
            uint16 _weight = AvatarsEscrowStorage.layout().avatarInfo[tokenId].weight;
            totalWeights += _weight;
            AvatarsEscrowStorage.layout().avatarInfo[tokenId] = AvatarInfo(_weight, address(0), 0, 0, 0, 0);
            AvatarsEscrowStorage.layout().userStakes[_msgSender()].remove(tokenId);

            emit AvatarUnstaked(tokenId, _msgSender()); // Avatar `id` unstaked from `address`
        }
        // update rewards
        _updateRewardsPerWeight(totalWeights.toUint32(), false);
        _updateUserRewards(_msgSender(), totalWeights.toUint32(), false);
    }

    function updateAvatar(
        uint256 _tokenId,
        string calldata _ipfsHash,
        uint256 _nonce,
        bytes calldata _updateApproverSignature
    ) external checkForUpgrade {
        require(
            (
                AvatarsEscrowStorage.layout().avatarInfo[_tokenId].owner == _msgSender()
                    && !AvatarsEscrowStorage.layout().AvatarsRental.isRentActive(_tokenId)
            )
                || (
                    AvatarsEscrowStorage.layout().avatarInfo[_tokenId].owner != address(0)
                        && AvatarsEscrowStorage.layout().AvatarsRental.getTenant(_tokenId) == _msgSender()
                ),
            "EH"
        ); // EH: Not your avatar or not rented
        AvatarsEscrowStorage.layout().Avatars_ERC721.updateAvatar(_tokenId, _ipfsHash, _nonce, _updateApproverSignature);
    }

    // Claim all rewards from caller into a given address
    function claim(address _to) external nonReentrant checkForUpgrade {
        _updateRewardsPerWeight(0, false);
        uint256 rewardAmount = _updateUserRewards(_msgSender(), 0, false);
        AvatarsEscrowStorage.layout().rewards[_msgSender()].accumulated = 0;
        TransferHelper.safeTransfer(AvatarsEscrowStorage.layout().rewardTokenAddress, _to, rewardAmount);
        emit RewardClaimed(_to, rewardAmount);
    }

    // ======== View only functions ========

    function getAvatarInfo(uint256 _tokenId) external view override returns (AvatarInfo memory) {
        return AvatarsEscrowStorage.layout().avatarInfo[_tokenId];
    }

    function checkUserRewards(address _user) external view returns (uint256) {
        RewardsPerWeight memory rewardsPerWeight_ = AvatarsEscrowStorage.layout().rewardsPerWeight;
        UserRewards memory userRewards_ = AvatarsEscrowStorage.layout().rewards[_user];

        // Find out the unaccounted time
        uint32 end = min(block.timestamp.toUint32(), AvatarsEscrowStorage.layout().rewardsPeriod.end);
        uint256 unaccountedTime = end - rewardsPerWeight_.lastUpdated; // Cast to uint256 to avoid overflows later on
        if (unaccountedTime != 0) {
            // Calculate and update the new value of the accumulator. unaccountedTime casts it into uint256, which is desired.
            // If the first mint happens mid-program, we don't update the accumulator, no one gets the rewards for that period.
            if (rewardsPerWeight_.totalWeight != 0) {
                rewardsPerWeight_.accumulated = (
                    rewardsPerWeight_.accumulated
                        + unaccountedTime * rewardsPerWeight_.rate / rewardsPerWeight_.totalWeight
                ).toUint96();
            }
        }
        // Calculate and update the new value user reserves. userRewards_.stakedWeight casts it into uint256, which is desired.
        return userRewards_.accumulated
            + userRewards_.stakedWeight * (rewardsPerWeight_.accumulated - userRewards_.checkpoint);
    }

    function rewardsPeriod() external view returns (IAvatarsEscrow.RewardsPeriod memory) {
        return AvatarsEscrowStorage.layout().rewardsPeriod;
    }

    function rewardsPerWeight() external view returns (IAvatarsEscrow.RewardsPerWeight memory) {
        return AvatarsEscrowStorage.layout().rewardsPerWeight;
    }

    function rewards(address user) external view returns (UserRewards memory) {
        return AvatarsEscrowStorage.layout().rewards[user];
    }

    function userStakedAvatars(address _user) external view returns (uint256[] memory) {
        uint256 length = AvatarsEscrowStorage.layout().userStakes[_user].length();
        uint256[] memory stakedAvatars = new uint256[](length);

        for (uint256 i = 0; i < length; i++) {
            stakedAvatars[i] = AvatarsEscrowStorage.layout().userStakes[_user].at(i);
        }

        return stakedAvatars;
    }

    function supportsInterface(bytes4 _interfaceId) public view override(ERC165, IERC165) returns (bool) {
        return _interfaceId == type(IAvatarsEscrow).interfaceId || super.supportsInterface(_interfaceId);
    }

    // ======== internal functions ========

    function _verifySignerSignature(bytes32 _hash, bytes calldata _signature) internal view returns (bool) {
        return _hash.toEthSignedMessageHash().recover(_signature) == AvatarsEscrowStorage.layout().signer;
    }

    function min(uint32 _x, uint32 _y) internal pure returns (uint32 z) {
        z = (_x < _y) ? _x : _y;
    }

    // Updates the rewards per weight accumulator.
    // Needs to be called on each staking/unstaking event.
    function _updateRewardsPerWeight(uint32 _weight, bool _increase) internal checkForUpgrade {
        RewardsPerWeight memory rewardsPerWeight_ = AvatarsEscrowStorage.layout().rewardsPerWeight;
        RewardsPeriod memory rewardsPeriod_ = AvatarsEscrowStorage.layout().rewardsPeriod;

        // We skip the update if the program hasn't started
        if (block.timestamp.toUint32() >= rewardsPeriod_.start) {
            // Find out the unaccounted time
            uint32 end = min(block.timestamp.toUint32(), rewardsPeriod_.end);
            uint256 unaccountedTime = end - rewardsPerWeight_.lastUpdated; // Cast to uint256 to avoid overflows later on
            if (unaccountedTime != 0) {
                // Calculate and update the new value of the accumulator.
                // If the first mint happens mid-program, we don't update the accumulator, no one gets the rewards for that period.
                if (rewardsPerWeight_.totalWeight != 0) {
                    rewardsPerWeight_.accumulated = (
                        rewardsPerWeight_.accumulated
                            + unaccountedTime * rewardsPerWeight_.rate / rewardsPerWeight_.totalWeight
                    ).toUint96();
                }
                rewardsPerWeight_.lastUpdated = end;
            }
        }
        if (_increase) {
            rewardsPerWeight_.totalWeight += _weight;
        } else {
            rewardsPerWeight_.totalWeight -= _weight;
        }
        AvatarsEscrowStorage.layout().rewardsPerWeight = rewardsPerWeight_;
        emit RewardsPerWeightUpdated(rewardsPerWeight_.accumulated);
    }

    // Accumulate rewards for an user.
    // Needs to be called on each staking/unstaking event.
    function _updateUserRewards(
        address _user,
        uint32 _weight,
        bool _increase
    ) internal checkForUpgrade returns (uint96) {
        UserRewards memory userRewards_ = AvatarsEscrowStorage.layout().rewards[_user];
        RewardsPerWeight memory rewardsPerWeight_ = AvatarsEscrowStorage.layout().rewardsPerWeight;

        // Calculate and update the new value user reserves.
        userRewards_.accumulated = userRewards_.accumulated
            + userRewards_.stakedWeight * (rewardsPerWeight_.accumulated - userRewards_.checkpoint);
        userRewards_.checkpoint = rewardsPerWeight_.accumulated;

        if (_weight != 0) {
            if (_increase) {
                userRewards_.stakedWeight += _weight;
            } else {
                userRewards_.stakedWeight -= _weight;
            }
            emit WeightUpdated(_user, _increase, _weight, block.timestamp);
        }
        AvatarsEscrowStorage.layout().rewards[_user] = userRewards_;
        emit UserRewardsUpdated(_user, userRewards_.accumulated, userRewards_.checkpoint);

        return userRewards_.accumulated;
    }

    function _ensureEOAorERC721Receiver(address _to) internal checkForUpgrade {
        uint32 size;
        assembly {
            size := extcodesize(_to)
        }
        if (size > 0) {
            try IERC721Receiver(_to).onERC721Received(address(this), address(this), 0, "") returns (bytes4 retval) {
                require(retval == IERC721Receiver.onERC721Received.selector, "ET"); // ET: neither EOA nor ERC721Receiver
            } catch (bytes memory) {
                revert("ET"); // ET: neither EOA nor ERC721Receiver
            }
        }
    }

    // ======== function overrides ========

    // Prevent sending ERC721 tokens directly to this contract
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external view override returns (bytes4) {
        from;
        tokenId;
        data; // supress solidity warnings
        if (operator == address(this)) {
            return this.onERC721Received.selector;
        } else {
            return 0x00000000;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (utils/introspection/ERC165.sol)

pragma solidity ^0.8.0;

import "./IERC165.sol";

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 *
 * Alternatively, {ERC165Storage} provides an easier to use but more expensive implementation.
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Provides information about the current execution context, including the
 * sender of the transaction and its data. While these are generally available
 * via msg.sender and msg.data, they should not be accessed in such a direct
 * manner, since when dealing with meta-transactions the account sending and
 * paying for execution may not be the actual sender (as far as an application
 * is concerned).
 *
 * This contract is only required for intermediate, library-like contracts.
 */
abstract contract Context {
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

    function _msgData() internal view virtual returns (bytes calldata) {
        return msg.data;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (security/ReentrancyGuard.sol)

pragma solidity ^0.8.0;

/**
 * @dev Contract module that helps prevent reentrant calls to a function.
 *
 * Inheriting from `ReentrancyGuard` will make the {nonReentrant} modifier
 * available, which can be applied to functions to make sure there are no nested
 * (reentrant) calls to them.
 *
 * Note that because there is a single `nonReentrant` guard, functions marked as
 * `nonReentrant` may not call one another. This can be worked around by making
 * those functions `private`, and then adding `external` `nonReentrant` entry
 * points to them.
 *
 * TIP: If you would like to learn more about reentrancy and alternative ways
 * to protect against it, check out our blog post
 * https://blog.openzeppelin.com/reentrancy-after-istanbul/[Reentrancy After Istanbul].
 */
abstract contract ReentrancyGuard {
    // Booleans are more expensive than uint256 or any type that takes up a full
    // word because each write operation emits an extra SLOAD to first read the
    // slot's contents, replace the bits taken up by the boolean, and then write
    // back. This is the compiler's defense against contract upgrades and
    // pointer aliasing, and it cannot be disabled.

    // The values being non-zero value makes deployment a bit more expensive,
    // but in exchange the refund on every call to nonReentrant will be lower in
    // amount. Since refunds are capped to a percentage of the total
    // transaction's gas, it is best to keep them low in cases like this one, to
    // increase the likelihood of the full refund coming into effect.
    uint256 private constant _NOT_ENTERED = 1;
    uint256 private constant _ENTERED = 2;

    uint256 private _status;

    constructor() {
        _status = _NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        // On the first call to nonReentrant, _notEntered will be true
        require(_status != _ENTERED, "ReentrancyGuard: reentrant call");

        // Any calls to nonReentrant after this point will fail
        _status = _ENTERED;

        _;

        // By storing the original value once again, a refund is triggered (see
        // https://eips.ethereum.org/EIPS/eip-2200)
        _status = _NOT_ENTERED;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0-rc.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV
    }

    function _throwError(RecoverError error) private pure {
        if (error == RecoverError.NoError) {
            return; // no error: do nothing
        } else if (error == RecoverError.InvalidSignature) {
            revert("ECDSA: invalid signature");
        } else if (error == RecoverError.InvalidSignatureLength) {
            revert("ECDSA: invalid signature length");
        } else if (error == RecoverError.InvalidSignatureS) {
            revert("ECDSA: invalid signature 's' value");
        } else if (error == RecoverError.InvalidSignatureV) {
            revert("ECDSA: invalid signature 'v' value");
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature` or error string. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     *
     * Documentation for signature generation:
     * - with https://web3js.readthedocs.io/en/v1.3.4/web3-eth-accounts.html#sign[Web3.js]
     * - with https://docs.ethers.io/v5/api/signer/#Signer-signMessage[ethers]
     *
     * _Available since v4.3._
     */
    function tryRecover(bytes32 hash, bytes memory signature) internal pure returns (address, RecoverError) {
        // Check the signature length
        // - case 65: r,s,v signature (standard)
        // - case 64: r,vs signature (cf https://eips.ethereum.org/EIPS/eip-2098) _Available since v4.1._
        if (signature.length == 65) {
            bytes32 r;
            bytes32 s;
            uint8 v;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                s := mload(add(signature, 0x40))
                v := byte(0, mload(add(signature, 0x60)))
            }
            return tryRecover(hash, v, r, s);
        } else if (signature.length == 64) {
            bytes32 r;
            bytes32 vs;
            // ecrecover takes the signature parameters, and the only way to get them
            // currently is to use assembly.
            assembly {
                r := mload(add(signature, 0x20))
                vs := mload(add(signature, 0x40))
            }
            return tryRecover(hash, r, vs);
        } else {
            return (address(0), RecoverError.InvalidSignatureLength);
        }
    }

    /**
     * @dev Returns the address that signed a hashed message (`hash`) with
     * `signature`. This address can then be used for verification purposes.
     *
     * The `ecrecover` EVM opcode allows for malleable (non-unique) signatures:
     * this function rejects them by requiring the `s` value to be in the lower
     * half order, and the `v` value to be either 27 or 28.
     *
     * IMPORTANT: `hash` _must_ be the result of a hash operation for the
     * verification to be secure: it is possible to craft signatures that
     * recover to arbitrary addresses for non-hashed data. A safe way to ensure
     * this is by receiving a hash of the original message (which may otherwise
     * be too long), and then calling {toEthSignedMessageHash} on it.
     */
    function recover(bytes32 hash, bytes memory signature) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, signature);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `r` and `vs` short-signature fields separately.
     *
     * See https://eips.ethereum.org/EIPS/eip-2098[EIP-2098 short signatures]
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address, RecoverError) {
        bytes32 s = vs & bytes32(0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff);
        uint8 v = uint8((uint256(vs) >> 255) + 27);
        return tryRecover(hash, v, r, s);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `r and `vs` short-signature fields separately.
     *
     * _Available since v4.2._
     */
    function recover(
        bytes32 hash,
        bytes32 r,
        bytes32 vs
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, r, vs);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Overload of {ECDSA-tryRecover} that receives the `v`,
     * `r` and `s` signature fields separately.
     *
     * _Available since v4.3._
     */
    function tryRecover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address, RecoverError) {
        // EIP-2 still allows signature malleability for ecrecover(). Remove this possibility and make the signature
        // unique. Appendix F in the Ethereum Yellow paper (https://ethereum.github.io/yellowpaper/paper.pdf), defines
        // the valid range for s in (301): 0 < s < secp256k1n ÷ 2 + 1, and for v in (302): v ∈ {27, 28}. Most
        // signatures from current libraries generate a unique signature with an s-value in the lower half order.
        //
        // If your library generates malleable signatures, such as s-values in the upper range, calculate a new s-value
        // with 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141 - s1 and flip v from 27 to 28 or
        // vice versa. If your library also generates signatures with 0/1 for v instead 27/28, add 27 to v to accept
        // these malleable signatures as well.
        if (uint256(s) > 0x7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF5D576E7357A4501DDFE92F46681B20A0) {
            return (address(0), RecoverError.InvalidSignatureS);
        }
        if (v != 27 && v != 28) {
            return (address(0), RecoverError.InvalidSignatureV);
        }

        // If the signature is valid (and not malleable), return the signer address
        address signer = ecrecover(hash, v, r, s);
        if (signer == address(0)) {
            return (address(0), RecoverError.InvalidSignature);
        }

        return (signer, RecoverError.NoError);
    }

    /**
     * @dev Overload of {ECDSA-recover} that receives the `v`,
     * `r` and `s` signature fields separately.
     */
    function recover(
        bytes32 hash,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) internal pure returns (address) {
        (address recovered, RecoverError error) = tryRecover(hash, v, r, s);
        _throwError(error);
        return recovered;
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n32", hash));
    }

    /**
     * @dev Returns an Ethereum Signed Message, created from `s`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes memory s) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19Ethereum Signed Message:\n", Strings.toString(s.length), s));
    }

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x01", domainSeparator, structHash));
    }
}

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

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 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
     */
    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 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
     */
    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 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
     */
    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 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
     */
    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 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
     */
    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 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
     */
    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.
     */
    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.
     */
    function toUint256(int256 value) internal pure returns (uint256) {
        require(value >= 0, "SafeCast: value must be positive");
        return uint256(value);
    }

    /**
     * @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) {
        require(value >= type(int128).min && value <= type(int128).max, "SafeCast: value doesn't fit in 128 bits");
        return int128(value);
    }

    /**
     * @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) {
        require(value >= type(int64).min && value <= type(int64).max, "SafeCast: value doesn't fit in 64 bits");
        return int64(value);
    }

    /**
     * @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) {
        require(value >= type(int32).min && value <= type(int32).max, "SafeCast: value doesn't fit in 32 bits");
        return int32(value);
    }

    /**
     * @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) {
        require(value >= type(int16).min && value <= type(int16).max, "SafeCast: value doesn't fit in 16 bits");
        return int16(value);
    }

    /**
     * @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) {
        require(value >= type(int8).min && value <= type(int8).max, "SafeCast: value doesn't fit in 8 bits");
        return int8(value);
    }

    /**
     * @dev Converts an unsigned uint256 into a signed int256.
     *
     * Requirements:
     *
     * - input must be less than or equal to maxInt256.
     */
    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 v4.4.1 (utils/structs/EnumerableSet.sol)

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.
 */
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) {
        return _values(set._inner);
    }

    // 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;

        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 on 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;

        assembly {
            result := store
        }

        return result;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.18;

import "@openzeppelin/contracts/utils/Context.sol";
import "./OwnableStorage.sol";

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
abstract contract Ownable is Context {
    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() {
        _transferOwnership(_msgSender());
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        _checkOwner();
        _;
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view virtual returns (address) {
        return OwnableStorage.layout().owner;
    }

    /**
     * @dev Throws if the sender is not the owner.
     */
    function _checkOwner() internal view virtual {
        require(owner() == _msgSender(), "Ownable: caller is not the owner");
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby disabling any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        _transferOwnership(address(0));
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(newOwner != address(0), "Ownable: new owner is the zero address");
        _transferOwnership(newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual {
        address oldOwner = OwnableStorage.layout().owner;
        OwnableStorage.layout().owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "../Ownable/Ownable.sol";
import "./UpgradeableStorage.sol";

contract Upgradeable is Ownable {
  function setUpgrade(bytes4 _sig, address _target) external onlyOwner {
    UpgradeableStorage.layout().upgrades[_sig] = _target;
  }

  function hasUpgrade(bytes4 _sig) private view returns (bool) {
    return UpgradeableStorage.layout().upgrades[_sig] != address(0);
  }

  function executeUpgrade(bytes4 _sig) private returns (bool) {
    address target = UpgradeableStorage.layout().upgrades[_sig];

    assembly {
      calldatacopy(0, 0, calldatasize())
      let result := delegatecall(gas(), target, 0, calldatasize(), 0, 0)
      returndatacopy(0, 0, returndatasize())
      switch result
        case 0 {revert(0, returndatasize())}
        default {return (0, returndatasize())}
    }
  }

  modifier checkForUpgrade() {
    if (hasUpgrade(msg.sig)) {
      executeUpgrade(msg.sig);
    } else {
      _;
    }
  }

  fallback() external payable {
    require(hasUpgrade(msg.sig));
    executeUpgrade(msg.sig);
  }

  receive() external payable {}
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

/**
    helper methods for interacting with ERC20 tokens that do not consistently return true/false
    with the addition of a transfer function to send eth or an erc20 token
*/
library TransferHelper {
    function safeTransfer(address _token, address _to, uint _value) internal {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(0xa9059cbb, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FAILED");
    }

    function safeTransferFrom(address _token, address _from, address _to, uint _value) internal {
        (bool success, bytes memory data) = _token.call(abi.encodeWithSelector(0x23b872dd, _from, _to, _value));
        require(success && (data.length == 0 || abi.decode(data, (bool))), "TransferHelper: TRANSFER_FROM_FAILED");
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";
import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IAvatarsEscrow is IERC165, IERC721Receiver {
    event WeightUpdated(address indexed user, bool increase, uint weight, uint timestamp);
    event AvatarStaked(uint256 indexed tokenId, address indexed user);
    event AvatarUnstaked(uint256 indexed tokenId, address indexed user);

    event RewardsSet(uint32 start, uint32 end, uint256 rate);
    event RewardsUpdated(uint32 start, uint32 end, uint256 rate);
    event RewardsPerWeightUpdated(uint256 accumulated);
    event UserRewardsUpdated(address user, uint256 userRewards, uint256 paidRewardPerWeight);
    event RewardClaimed(address receiver, uint256 claimed);

    struct AvatarInfo {
        uint16 weight;          // weight based on rarity
        address owner;          // staked to, otherwise owner == 0
        uint16 deposit;         // unit is ether, paid in WRLD. The deposit is deducted from the last payment(s) since the deposit is non-custodial
        uint16 rentalPerDay;    // unit is ether, paid in WRLD. Total is deposit + rentalPerDay * days
        uint16 minRentDays;     // must rent for at least min rent days, otherwise deposit is forfeited up to this amount
        uint32 rentableUntil;   // timestamp in unix epoch
    }

    struct RewardsPeriod {
        uint32 start;           // reward start time, in unix epoch
        uint32 end;             // reward end time, in unix epoch
    }

    struct RewardsPerWeight {
        uint32 totalWeight;
        uint96 accumulated;
        uint32 lastUpdated;
        uint96 rate;
    }

    struct UserRewards {
        uint32 stakedWeight;
        uint96 accumulated;
        uint96 checkpoint;
    }

    // view functions
    function getAvatarInfo(uint _tokenId) external view returns(AvatarInfo memory);
    function checkUserRewards(address _user) external view returns(uint);
    function rewardsPeriod() external view returns (IAvatarsEscrow.RewardsPeriod memory);
    function rewardsPerWeight() external view returns(RewardsPerWeight memory);
    function rewards(address _user) external view returns (UserRewards memory);
    function userStakedAvatars(address _user) external view returns (uint256[] memory);
    function onERC721Received(address, address, uint256, bytes calldata) external view override returns(bytes4);

    // public functions
    function initialStake(
      uint[] calldata _tokenIds,
      uint[] calldata _weights,
      address _stakeTo,
      uint16 _deposit,
      uint16 _rentalPerDay,
      uint16 _minRentDays,
      uint32 _rentableUntil,
      uint32 _maxTimestamp,
      bytes calldata _signature
    ) external;

    function stake(
      uint[] calldata _tokenIds,
      address _stakeTo,
      uint16 _deposit,
      uint16 _rentalPerDay,
      uint16 _minRentDays,
      uint32 _rentableUntil
    ) external;

    function updateRent(
      uint[] calldata _tokenIds,
      uint16 _deposit,
      uint16 _rentalPerDay,
      uint16 _minRentDays,
      uint32 _rentableUntil
    ) external;

    function extendRentalPeriod(uint _tokenId, uint32 _rentableUntil) external;
    function unstake(uint[] calldata _tokenIds, address unstakeTo) external;
    function claim(address _to) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/utils/introspection/IERC165.sol";

interface IAvatarsRental is IERC165 {
    event AvatarRented(uint256 indexed tokenId, address indexed tenant, uint256 payment);
    event RentalPaid(uint256 indexed tokenId, address indexed tenant, uint256 payment);
    event RentalTerminated(uint256 indexed tokenId, address indexed tenant);

    struct AvatarRentInfo {
        address tenant;         // rented to, otherwise tenant == 0
        uint32 rentStartTime;   // timestamp in unix epoch
        uint32 rentalPaid;      // total rental paid since the beginning including the deposit
        uint32 paymentAlert;    // alert time before next rent payment in seconds (used by frontend only)
    }

    function isRentActive(uint _tokenId) external view returns(bool);
    function getTenant(uint _tokenId) external view returns(address);
    function rentedByIndex(address _tenant, uint _index) external view returns(uint);
    function isRentable(uint _tokenId) external view returns(bool state);
    function rentalPaidUntil(uint _tokenId) external view returns(uint paidUntil);

    function rentAvatar(uint _tokenId, uint32 _paymentAlert, uint32 initialPayment) external;
    function payRent(uint _tokenId, uint32 _payment) external;
    function terminateRental(uint _tokenId) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "@openzeppelin/contracts/token/ERC721/IERC721.sol";

interface IAvatars_ERC721 is IERC721 {
    function updateAvatar(
        uint _tokenId, 
        string calldata _ipfsHash, 
        uint256 _nonce, 
        bytes calldata _updateApproverSignature
    ) external;
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

import "./IAvatars_ERC721.sol";
import "./IAvatarsEscrow.sol";
import "./IAvatarsRental.sol";
import "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

library AvatarsEscrowStorage {
  
  bytes32 private constant STORAGE_SLOT = keccak256("slot.avatars.escrow");

  struct Layout {
    address rewardTokenAddress;
    IAvatars_ERC721 Avatars_ERC721;
    IAvatarsRental AvatarsRental;
    IAvatarsEscrow.AvatarInfo[15000] avatarInfo; // Avatar tokenId is in N [0,15000]
    IAvatarsEscrow.RewardsPeriod rewardsPeriod;
    IAvatarsEscrow.RewardsPerWeight rewardsPerWeight;
    mapping(address => IAvatarsEscrow.UserRewards) rewards;
    mapping(address => EnumerableSet.UintSet) userStakes;
    address signer;
  }

  function layout() internal pure returns (Layout storage _layout) {
    bytes32 slot = STORAGE_SLOT;

    assembly {
      _layout.slot := slot
    }
  }
}

// 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 IERC165 {
    /**
     * @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 v4.4.1 (utils/Strings.sol)

pragma solidity ^0.8.0;

/**
 * @dev String operations.
 */
library Strings {
    bytes16 private constant _HEX_SYMBOLS = "0123456789abcdef";

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        // Inspired by OraclizeAPI's implementation - MIT licence
        // https://github.com/oraclize/ethereum-api/blob/b42146b063c7d6ee1358846c198246239e9360e8/oraclizeAPI_0.4.25.sol

        if (value == 0) {
            return "0";
        }
        uint256 temp = value;
        uint256 digits;
        while (temp != 0) {
            digits++;
            temp /= 10;
        }
        bytes memory buffer = new bytes(digits);
        while (value != 0) {
            digits -= 1;
            buffer[digits] = bytes1(uint8(48 + uint256(value % 10)));
            value /= 10;
        }
        return string(buffer);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        if (value == 0) {
            return "0x00";
        }
        uint256 temp = value;
        uint256 length = 0;
        while (temp != 0) {
            length++;
            temp >>= 8;
        }
        return toHexString(value, length);
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation with fixed length.
     */
    function toHexString(uint256 value, uint256 length) internal pure returns (string memory) {
        bytes memory buffer = new bytes(2 * length + 2);
        buffer[0] = "0";
        buffer[1] = "x";
        for (uint256 i = 2 * length + 1; i > 1; --i) {
            buffer[i] = _HEX_SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

library OwnableStorage {
  bytes32 private constant STORAGE_SLOT = keccak256("gg.topia.worlds.Ownable");

  struct Layout {
    address owner;
  }

  function layout() internal pure returns (Layout storage _layout) {
    bytes32 slot = STORAGE_SLOT;

    assembly {
      _layout.slot := slot
    }
  }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.18;

library UpgradeableStorage {
  bytes32 private constant STORAGE_SLOT = keccak256("gg.topia.worlds.Upgradeable");

  struct Layout {
    mapping(bytes4 => address) upgrades;
  }

  function layout() internal pure returns (Layout storage _layout) {
    bytes32 slot = STORAGE_SLOT;

    assembly {
      _layout.slot := slot
    }
  }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.0;

/**
 * @title ERC721 token receiver interface
 * @dev Interface for any contract that wants to support safeTransfers
 * from ERC721 asset contracts.
 */
interface IERC721Receiver {
    /**
     * @dev Whenever an {IERC721} `tokenId` token is transferred to this contract via {IERC721-safeTransferFrom}
     * by `operator` from `from`, this function is called.
     *
     * It must return its Solidity selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented by the recipient, the transfer will be reverted.
     *
     * The selector can be obtained in Solidity with `IERC721.onERC721Received.selector`.
     */
    function onERC721Received(
        address operator,
        address from,
        uint256 tokenId,
        bytes calldata data
    ) external returns (bytes4);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (token/ERC721/IERC721.sol)

pragma solidity ^0.8.0;

import "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @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`, 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 be 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: Usage of this method is discouraged, use {safeTransferFrom} whenever possible.
     *
     * 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 Returns the account approved for `tokenId` token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function getApproved(uint256 tokenId) external view returns (address operator);

    /**
     * @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 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);

    /**
     * @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;
}

{
  "remappings": [
    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "hardhat/=node_modules/hardhat/",
    "@create3-factory/=lib/create3-factory/src/",
    "src/=src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 800
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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000000000000000000000000ccccb68e1a848cbdb5b60a974e07aae143ed40c300000000000000000000000005745e72fb8b4a9b51118a168d956760e4a36444

-----Decoded View---------------
Arg [0] : _rewardTokenAddress (address): 0xcccCb68e1A848CBDB5b60a974E07aAE143ed40C3
Arg [1] : _avatars (address): 0x05745e72fB8b4a9b51118A168D956760e4a36444

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000ccccb68e1a848cbdb5b60a974e07aae143ed40c3
Arg [1] : 00000000000000000000000005745e72fb8b4a9b51118a168d956760e4a36444