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// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

// Inheritance
import {IRewardEscrowV2} from "./interfaces/IRewardEscrowV2.sol";
import {ERC721EnumerableUpgradeable} from
    "@openzeppelin/contracts-upgradeable/token/ERC721/extensions/ERC721EnumerableUpgradeable.sol";
import {Ownable2StepUpgradeable} from
    "@openzeppelin/contracts-upgradeable/access/Ownable2StepUpgradeable.sol";
import {PausableUpgradeable} from
    "@openzeppelin/contracts-upgradeable/security/PausableUpgradeable.sol";
import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";

// Internal references
import {IKwenta} from "./interfaces/IKwenta.sol";
import {IStakingRewardsV2} from "./interfaces/IStakingRewardsV2.sol";
import {IEscrowMigrator} from "./interfaces/IEscrowMigrator.sol";

/// @title KWENTA Reward Escrow V2
/// @author Originally inspired by SYNTHETIX RewardEscrow
/// @author Kwenta's RewardEscrow V1 by JaredBorders ([email protected]), JChiaramonte7 ([email protected])
/// @author RewardEscrowV2 by tommyrharper ([email protected])
/// @notice Updated version of Synthetix's RewardEscrow with new features specific to Kwenta
contract RewardEscrowV2 is
    IRewardEscrowV2,
    ERC721EnumerableUpgradeable,
    Ownable2StepUpgradeable,
    PausableUpgradeable,
    UUPSUpgradeable
{
    /*///////////////////////////////////////////////////////////////
                        CONSTANTS/IMMUTABLES
    ///////////////////////////////////////////////////////////////*/

    /// @notice Max escrow duration
    /// @dev WARNING: updating this value to less than 2 years will allow this check to be bypassed
    /// via the escrow migrator contract, by creating V1 escrow entries and migrating them to V2
    uint256 public constant MAX_DURATION = 4 * 52 weeks; // Default max 4 years duration

    /// @notice Min escrow duration
    uint256 public constant DEFAULT_DURATION = 52 weeks; // Default 1 year duration

    /// @notice Default early vesting fee - used for new vesting entries from staking rewards
    uint256 public constant DEFAULT_EARLY_VESTING_FEE = 90; // Default 90 percent

    /// @notice Maximum early vesting fee - cannot be higher than 100%
    /// @dev WARNING: Updating this value to below 90 will be able to be bypassed via importEscrowEntry
    /// through the EscrowMigrator contract
    uint256 public constant MAXIMUM_EARLY_VESTING_FEE = 100;

    /// @inheritdoc IRewardEscrowV2
    /// @dev WARNING: see warning in IRewardEscrowV2 if planning on changing this value
    uint256 public constant MINIMUM_EARLY_VESTING_FEE = 50;

    /// @notice Contract for KWENTA ERC20 token
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    IKwenta public immutable kwenta;

    /// @notice RewardsNotifier address
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable
    address public immutable rewardsNotifier;

    /*///////////////////////////////////////////////////////////////
                                STATE
    ///////////////////////////////////////////////////////////////*/

    /// @notice Contract for StakingRewardsV2
    IStakingRewardsV2 public stakingRewards;

    /// @notice Contract for EscrowMigrator
    IEscrowMigrator public escrowMigrator;

    /// @notice treasury address - this may change
    address public treasuryDAO;

    ///@notice mapping of entryIDs to vesting entries
    mapping(uint256 => VestingEntryPacked) public vestingSchedules;

    /// @notice Counter for new vesting entry ids
    uint256 public nextEntryId;

    /// @notice An account's total escrowed KWENTA balance to save recomputing this for fee extraction purposes
    mapping(address => uint256) public totalEscrowedAccountBalance;

    /// @notice An account's total vested reward KWENTA
    mapping(address => uint256) public totalVestedAccountBalance;

    /// @notice The total remaining escrowed balance, for verifying the actual KWENTA balance of this contract against
    uint256 public totalEscrowedBalance;

    /*///////////////////////////////////////////////////////////////
                                AUTH
    ///////////////////////////////////////////////////////////////*/

    /// @notice Restrict function to only the staking rewards contract
    modifier onlyStakingRewards() {
        _onlyStakingRewards();
        _;
    }

    function _onlyStakingRewards() internal view {
        if (msg.sender != address(stakingRewards)) revert OnlyStakingRewards();
    }

    /// @notice Restrict function to only the escrow migrator contract
    modifier onlyEscrowMigrator() {
        if (msg.sender != address(escrowMigrator)) revert OnlyEscrowMigrator();
        _;
    }

    /*///////////////////////////////////////////////////////////////
                        CONSTRUCTOR / INITIALIZER
    ///////////////////////////////////////////////////////////////*/

    /// @dev disable default constructor for disable implementation contract
    /// Actual contract construction will take place in the initialize function via proxy
    /// @custom:oz-upgrades-unsafe-allow constructor
    /// @param _kwenta The address for the KWENTA ERC20 token
    /// @param _rewardsNotifier The address for the StakingRewardsNotifier contract
    constructor(address _kwenta, address _rewardsNotifier) {
        if (_kwenta == address(0) || _rewardsNotifier == address(0)) revert ZeroAddress();

        kwenta = IKwenta(_kwenta);
        rewardsNotifier = _rewardsNotifier;

        _disableInitializers();
    }

    /// @inheritdoc IRewardEscrowV2
    function initialize(address _contractOwner) external initializer {
        if (_contractOwner == address(0)) revert ZeroAddress();

        // Initialize inherited contracts
        __ERC721_init("Kwenta Reward Escrow", "KRE");
        __Ownable2Step_init();
        __Pausable_init();
        __UUPSUpgradeable_init();

        // transfer ownership
        _transferOwnership(_contractOwner);

        // define variables
        nextEntryId = 1;
    }

    /*///////////////////////////////////////////////////////////////
                                SETTERS
    ///////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRewardEscrowV2
    function setStakingRewards(address _stakingRewards) external onlyOwner {
        if (_stakingRewards == address(0)) revert ZeroAddress();
        if (address(stakingRewards) != address(0)) revert StakingRewardsAlreadySet();

        stakingRewards = IStakingRewardsV2(_stakingRewards);
        emit StakingRewardsSet(_stakingRewards);
    }

    /// @inheritdoc IRewardEscrowV2
    function setEscrowMigrator(address _escrowMigrator) external onlyOwner {
        if (_escrowMigrator == address(0)) revert ZeroAddress();

        escrowMigrator = IEscrowMigrator(_escrowMigrator);
        emit EscrowMigratorSet(_escrowMigrator);
    }

    /// @inheritdoc IRewardEscrowV2
    function setTreasuryDAO(address _treasuryDAO) external onlyOwner {
        if (_treasuryDAO == address(0)) revert ZeroAddress();
        treasuryDAO = _treasuryDAO;
        emit TreasuryDAOSet(treasuryDAO);
    }

    /*///////////////////////////////////////////////////////////////
                                VIEWS
    ///////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRewardEscrowV2
    function getKwentaAddress() external view returns (address) {
        return address(kwenta);
    }

    /// @inheritdoc IRewardEscrowV2
    function escrowedBalanceOf(address _account) external view returns (uint256) {
        return totalEscrowedAccountBalance[_account];
    }

    /// @inheritdoc IRewardEscrowV2
    function unstakedEscrowedBalanceOf(address _account) public view returns (uint256) {
        return totalEscrowedAccountBalance[_account] - stakingRewards.escrowedBalanceOf(_account);
    }

    /// @inheritdoc IRewardEscrowV2
    function getVestingEntry(uint256 _entryID)
        external
        view
        returns (uint256 endTime, uint256 escrowAmount, uint256 duration, uint256 earlyVestingFee)
    {
        VestingEntryPacked storage entry = vestingSchedules[_entryID];
        endTime = entry.endTime;
        escrowAmount = entry.escrowAmount;
        duration = entry.duration;
        earlyVestingFee = entry.earlyVestingFee;
    }

    /// @inheritdoc IRewardEscrowV2
    function getVestingSchedules(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (VestingEntryWithID[] memory)
    {
        if (_pageSize == 0) {
            return new VestingEntryWithID[](0);
        }

        uint256 endIndex = _index + _pageSize;

        // If the page extends past the end of the list, truncate it.
        uint256 numEntries = balanceOf(_account);
        if (endIndex > numEntries) {
            endIndex = numEntries;
        }

        if (endIndex < _index) return new VestingEntryWithID[](0);

        uint256 n;
        unchecked {
            n = endIndex - _index;
        }

        VestingEntryWithID[] memory vestingEntries = new VestingEntryWithID[](
            n
        );
        for (uint256 i; i < n;) {
            uint256 entryID;

            unchecked {
                entryID = tokenOfOwnerByIndex(_account, i + _index);
            }

            VestingEntryPacked storage entry = vestingSchedules[entryID];

            vestingEntries[i] = VestingEntryWithID({
                endTime: entry.endTime,
                escrowAmount: entry.escrowAmount,
                entryID: entryID
            });

            unchecked {
                ++i;
            }
        }
        return vestingEntries;
    }

    /// @inheritdoc IRewardEscrowV2
    function getAccountVestingEntryIDs(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (uint256[] memory)
    {
        uint256 endIndex = _index + _pageSize;

        // If the page extends past the end of the list, truncate it.
        uint256 numEntries = balanceOf(_account);
        if (endIndex > numEntries) {
            endIndex = numEntries;
        }
        if (endIndex <= _index) {
            return new uint256[](0);
        }

        uint256 n = endIndex - _index;
        uint256[] memory page = new uint256[](n);
        for (uint256 i; i < n;) {
            unchecked {
                page[i] = tokenOfOwnerByIndex(_account, i + _index);
            }

            unchecked {
                ++i;
            }
        }
        return page;
    }

    /// @inheritdoc IRewardEscrowV2
    function getVestingQuantity(uint256[] calldata _entryIDs)
        external
        view
        returns (uint256 total, uint256 totalFee)
    {
        uint256 entryIDsLength = _entryIDs.length;
        for (uint256 i = 0; i < entryIDsLength;) {
            VestingEntry memory entry = _unpackVestingEntryStruct(_entryIDs[i]);

            (uint256 quantity, uint256 fee) = _claimableAmount(entry);

            // add quantity to total
            total += quantity;
            totalFee += fee;

            unchecked {
                ++i;
            }
        }
    }

    /// @inheritdoc IRewardEscrowV2
    function getVestingEntryClaimable(uint256 _entryID)
        external
        view
        returns (uint256 quantity, uint256 fee)
    {
        VestingEntry memory entry = _unpackVestingEntryStruct(_entryID);
        (quantity, fee) = _claimableAmount(entry);
    }

    function _claimableAmount(VestingEntry memory _entry)
        internal
        view
        returns (uint256 quantity, uint256 fee)
    {
        uint256 escrowAmount = _entry.escrowAmount;

        // Full escrow amounts claimable if block.timestamp equal to or after entry endTime
        if (block.timestamp >= _entry.endTime) {
            quantity = escrowAmount;
        } else {
            fee = _earlyVestFee(_entry);
            quantity = escrowAmount - fee;
        }
    }

    function _earlyVestFee(VestingEntry memory _entry)
        internal
        view
        returns (uint256 earlyVestFee)
    {
        uint256 timeUntilVest = _entry.endTime - block.timestamp;
        // Fee starts by default at 90% (but could be any percentage) and falls linearly
        earlyVestFee =
            (_entry.escrowAmount * _entry.earlyVestingFee * timeUntilVest) / (100 * _entry.duration);
    }

    /*///////////////////////////////////////////////////////////////
                            MUTATIVE FUNCTIONS
    ///////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRewardEscrowV2
    function vest(uint256[] calldata _entryIDs) external whenNotPaused {
        uint256 total;
        uint256 totalFee;
        uint256 entryIDsLength = _entryIDs.length;
        for (uint256 i = 0; i < entryIDsLength; ++i) {
            uint256 entryID = _entryIDs[i];
            if (_ownerOf(entryID) != msg.sender) {
                continue;
            }

            (uint256 quantity, uint256 fee) = _claimableAmount(_unpackVestingEntryStruct(entryID));

            // update entry to remove escrowAmount
            vestingSchedules[entryID].escrowAmount = 0;
            _burn(entryID);

            // add quantity to total
            total += quantity;
            totalFee += fee;
        }

        // Transfer vested tokens
        uint256 totalWithFee = total + totalFee;
        if (totalWithFee != 0) {
            // Unstake staked escrowed kwenta if needed for reward/fee
            uint256 unstakedEscrow = unstakedEscrowedBalanceOf(msg.sender);
            if (totalWithFee > unstakedEscrow) {
                uint256 amountToUnstake;
                unchecked {
                    amountToUnstake = totalWithFee - unstakedEscrow;
                }
                stakingRewards.unstakeEscrowSkipCooldown(msg.sender, amountToUnstake);
            }

            // update balances
            totalEscrowedBalance -= totalWithFee;
            totalEscrowedAccountBalance[msg.sender] -= totalWithFee;
            totalVestedAccountBalance[msg.sender] += total;

            // Send 50% any fee to Treasury and
            // 50% to RewardsNotifier
            // UNLESS Distributor isn't set
            // then send all funds to Treasury
            if (totalFee != 0) {
                /// @dev this will revert if the kwenta token transfer fails
                uint256 amountToTreasury = totalFee / 2;
                uint256 amountToNotifier = totalFee - amountToTreasury;
                kwenta.transfer(treasuryDAO, amountToTreasury);
                kwenta.transfer(rewardsNotifier, amountToNotifier);
                emit EarlyVestFeeSent(amountToTreasury, amountToNotifier);
            }

            if (total != 0) {
                // Transfer kwenta
                /// @dev this will revert if the kwenta token transfer fails
                kwenta.transfer(msg.sender, total);
            }

            // trigger event
            emit Vested(msg.sender, total);
        }
    }

    /// @inheritdoc IRewardEscrowV2
    function importEscrowEntry(address _account, VestingEntry memory _entry)
        external
        onlyEscrowMigrator
    {
        _mint(
            _account, _entry.endTime, _entry.escrowAmount, _entry.duration, _entry.earlyVestingFee
        );
    }

    /// @inheritdoc IRewardEscrowV2
    function createEscrowEntry(
        address _beneficiary,
        uint256 _deposit,
        uint256 _duration,
        uint256 _earlyVestingFee
    ) external {
        if (_beneficiary == address(0)) revert ZeroAddress();
        if (_earlyVestingFee > MAXIMUM_EARLY_VESTING_FEE) revert EarlyVestingFeeTooHigh();
        if (_earlyVestingFee < MINIMUM_EARLY_VESTING_FEE) revert EarlyVestingFeeTooLow();
        if (_deposit == 0) revert ZeroAmount();
        uint256 minimumDuration = stakingRewards.cooldownPeriod();
        if (_duration < minimumDuration || _duration > MAX_DURATION) revert InvalidDuration();

        /// @dev this will revert if the kwenta token transfer fails
        kwenta.transferFrom(msg.sender, address(this), _deposit);

        // Escrow the tokens for duration.
        uint256 endTime = block.timestamp + _duration;

        // Append vesting entry for the beneficiary address
        _mint(_beneficiary, endTime, _deposit, _duration, _earlyVestingFee);
    }

    /// @inheritdoc IRewardEscrowV2
    function appendVestingEntry(address _account, uint256 _quantity) external onlyStakingRewards {
        // Escrow the tokens for duration.
        uint256 endTime = block.timestamp + DEFAULT_DURATION;

        _mint(_account, endTime, _quantity, DEFAULT_DURATION, DEFAULT_EARLY_VESTING_FEE);
    }

    /// @inheritdoc IRewardEscrowV2
    function bulkTransferFrom(address _from, address _to, uint256[] calldata _entryIDs)
        external
        whenNotPaused
    {
        if (_from == _to) revert CannotTransferToSelf();

        uint256 totalEscrowTransferred;
        uint256 entryIDsLength = _entryIDs.length;
        for (uint256 i = 0; i < entryIDsLength;) {
            uint256 entryID = _entryIDs[i];
            // sum totalEscrowTransferred so that _applyTransferBalanceUpdates can be applied only once to save gas
            totalEscrowTransferred += uint256(vestingSchedules[entryID].escrowAmount);

            _checkApproved(entryID);
            // use super._transfer to avoid double updating of balances
            super._transfer(_from, _to, entryID);
            unchecked {
                ++i;
            }
        }

        // update balances all at once
        _applyTransferBalanceUpdates(_from, _to, totalEscrowTransferred);
    }

    /*///////////////////////////////////////////////////////////////
                                INTERNALS
    ///////////////////////////////////////////////////////////////*/

    /// @dev override the internal _transfer function to ensure vestingSchedules and account balances are updated
    /// and that there is sufficient unstaked escrow for a transfer when transferFrom and safeTransferFrom are called
    function _transfer(address _from, address _to, uint256 _entryID)
        internal
        override
        whenNotPaused
    {
        uint256 escrowAmount = vestingSchedules[_entryID].escrowAmount;

        _applyTransferBalanceUpdates(_from, _to, escrowAmount);

        super._transfer(_from, _to, _entryID);
    }

    function _applyTransferBalanceUpdates(address _from, address _to, uint256 _escrowAmount)
        internal
    {
        uint256 unstakedEscrow = unstakedEscrowedBalanceOf(_from);
        if (unstakedEscrow < _escrowAmount) {
            revert InsufficientUnstakedBalance(_escrowAmount, unstakedEscrow);
        }

        unchecked {
            totalEscrowedAccountBalance[_from] -= _escrowAmount;
        }
        totalEscrowedAccountBalance[_to] += _escrowAmount;
    }

    function _checkApproved(uint256 _entryID) internal view {
        /// @dev not using a custom error to keep consistency with OpenZeppelin errors
        require(
            _isApprovedOrOwner(_msgSender(), _entryID),
            "ERC721: caller is not token owner or approved"
        );
    }

    function _mint(
        address _account,
        uint256 _endTime,
        uint256 _quantity,
        uint256 _duration,
        uint256 _earlyVestingFee
    ) internal whenNotPaused {
        // There must be enough balance in the contract to provide for the vesting entry.
        totalEscrowedBalance += _quantity;
        assert(kwenta.balanceOf(address(this)) >= totalEscrowedBalance);

        // Add quantity to account's escrowed balance
        totalEscrowedAccountBalance[_account] += _quantity;

        uint256 entryID = nextEntryId;
        vestingSchedules[entryID] = VestingEntryPacked({
            endTime: uint64(_endTime),
            escrowAmount: uint144(_quantity),
            duration: uint40(_duration),
            earlyVestingFee: uint8(_earlyVestingFee)
        });

        // Increment the next entry id.
        unchecked {
            ++nextEntryId;
        }

        emit VestingEntryCreated(_account, _quantity, _duration, entryID, _earlyVestingFee);

        super._mint(_account, entryID);
    }

    function _unpackVestingEntryStruct(uint256 _entryID)
        internal
        view
        returns (VestingEntry memory vestingEntry)
    {
        VestingEntryPacked storage entry = vestingSchedules[_entryID];
        vestingEntry = VestingEntry({
            endTime: entry.endTime,
            escrowAmount: entry.escrowAmount,
            duration: entry.duration,
            earlyVestingFee: entry.earlyVestingFee
        });
    }

    function _authorizeUpgrade(address _newImplementation) internal override onlyOwner {}

    /*///////////////////////////////////////////////////////////////
                                PAUSABLE
    ///////////////////////////////////////////////////////////////*/

    /// @inheritdoc IRewardEscrowV2
    function pauseRewardEscrow() external onlyOwner {
        _pause();
    }

    /// @inheritdoc IRewardEscrowV2
    function unpauseRewardEscrow() external onlyOwner {
        _unpause();
    }
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IRewardEscrowV2 {
    /*//////////////////////////////////////////////////////////////
                                STRUCTS
    //////////////////////////////////////////////////////////////*/

    /// @notice A vesting entry contains the data for each escrow NFT
    struct VestingEntry {
        // The amount of KWENTA stored in this vesting entry
        uint256 escrowAmount;
        // The length of time until the entry is fully matured
        uint256 duration;
        // The time at which the entry will be fully matured
        uint256 endTime;
        // The percentage fee for vesting immediately
        // The actual penalty decreases linearly with time until it reaches 0 at block.timestamp=endTime
        uint256 earlyVestingFee;
    }

    /// @notice The same as VestingEntry but packed to fit in a single slot
    struct VestingEntryPacked {
        uint144 escrowAmount;
        uint40 duration;
        uint64 endTime;
        uint8 earlyVestingFee;
    }

    /// @notice Helper struct for getVestingSchedules view
    struct VestingEntryWithID {
        // The amount of KWENTA stored in this vesting entry
        uint256 escrowAmount;
        // The unique ID of this escrow entry NFT
        uint256 entryID;
        // The time at which the entry will be fully matured
        uint256 endTime;
    }

    /*///////////////////////////////////////////////////////////////
                                INITIALIZER
    ///////////////////////////////////////////////////////////////*/

    /// @notice Initializes the contract
    /// @param _owner The address of the owner of this contract
    /// @dev this function should be called via proxy, not via direct contract interaction
    function initialize(address _owner) external;

    /*///////////////////////////////////////////////////////////////
                                SETTERS
    ///////////////////////////////////////////////////////////////*/

    /// @notice Function used to define the StakingRewardsV2 contract address to use
    /// @param _stakingRewards The address of the StakingRewardsV2 contract
    /// @dev This function can only be called once
    function setStakingRewards(address _stakingRewards) external;

    /// @notice Function used to define the EscrowMigrator contract address to use
    /// @param _escrowMigrator The address of the EscrowMigrator contract
    function setEscrowMigrator(address _escrowMigrator) external;

    /// @notice Function used to define the TreasuryDAO address to use
    /// @param _treasuryDAO The address of the TreasuryDAO
    /// @dev This function can only be called multiple times
    function setTreasuryDAO(address _treasuryDAO) external;

    /*///////////////////////////////////////////////////////////////
                                VIEWS
    ///////////////////////////////////////////////////////////////*/

    /// @notice Minimum early vesting fee
    /// @dev this must be high enought to prevent governance attacks where the user
    /// can set the early vesting fee to a very low number, stake, vote, then withdraw
    /// via vesting which avoids the unstaking cooldown
    function MINIMUM_EARLY_VESTING_FEE() external view returns (uint256);

    /// @notice Default early vesting fee
    /// @dev This is the default fee applied for early vesting
    function DEFAULT_EARLY_VESTING_FEE() external view returns (uint256);

    /// @notice Default escrow duration
    /// @dev This is the default duration for escrow
    function DEFAULT_DURATION() external view returns (uint256);

    /// @notice helper function to return kwenta address
    function getKwentaAddress() external view returns (address);

    /// @notice A simple alias to totalEscrowedAccountBalance
    function escrowedBalanceOf(address _account) external view returns (uint256);

    /// @notice Get the amount of escrowed kwenta that is not staked for a given account
    function unstakedEscrowedBalanceOf(address _account) external view returns (uint256);

    /// @notice Get the details of a given vesting entry
    /// @param _entryID The id of the vesting entry.
    /// @return endTime the vesting entry object
    /// @return escrowAmount rate per second emission.
    /// @return duration the duration of the vesting entry.
    /// @return earlyVestingFee the early vesting fee of the vesting entry.
    function getVestingEntry(uint256 _entryID)
        external
        view
        returns (uint256, uint256, uint256, uint256);

    /// @notice Get the vesting entries for a given account
    /// @param _account The account to get the vesting entries for
    /// @param _index The index of the first vesting entry to get
    /// @param _pageSize The number of vesting entries to get
    /// @return vestingEntries the list of vesting entries with ids
    function getVestingSchedules(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (VestingEntryWithID[] memory);

    /// @notice Get the vesting entries for a given account
    /// @param _account The account to get the vesting entries for
    /// @param _index The index of the first vesting entry to get
    /// @param _pageSize The number of vesting entries to get
    /// @return vestingEntries the list of vesting entry ids
    function getAccountVestingEntryIDs(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (uint256[] memory);

    /// @notice Get the amount that can be vested now for a set of vesting entries
    /// @param _entryIDs The ids of the vesting entries to get the quantity for
    /// @return total The total amount that can be vested for these entries
    /// @return totalFee The total amount of fees that will be paid for these vesting entries
    function getVestingQuantity(uint256[] calldata _entryIDs)
        external
        view
        returns (uint256, uint256);

    /// @notice Get the amount that can be vested now for a given vesting entry
    /// @param _entryID The id of the vesting entry to get the quantity for
    /// @return quantity The total amount that can be vested for this entry
    /// @return totalFee The total amount of fees that will be paid for this vesting entry
    function getVestingEntryClaimable(uint256 _entryID) external view returns (uint256, uint256);

    /*///////////////////////////////////////////////////////////////
                            MUTATIVE FUNCTIONS
    ///////////////////////////////////////////////////////////////*/

    /// @notice Vest escrowed amounts that are claimable - allows users to vest their vesting entries based on msg.sender
    /// @param _entryIDs The ids of the vesting entries to vest
    function vest(uint256[] calldata _entryIDs) external;

    /// @notice Utilized by the escrow migrator contract to transfer V1 escrow
    /// @param _account The account to import the escrow entry to
    /// @param entryToImport The vesting entry to import
    function importEscrowEntry(address _account, VestingEntry memory entryToImport) external;

    /// @notice Create an escrow entry to lock KWENTA for a given duration in seconds
    /// @param _beneficiary The account that will be able to withdraw the escrowed amount
    /// @param _deposit The amount of KWENTA to escrow
    /// @param _duration The duration in seconds to lock the KWENTA for
    /// @param _earlyVestingFee The fee to apply if the escrowed amount is withdrawn before the end of the vesting period
    /// @dev the early vesting fee decreases linearly over the vesting period
    /// @dev This call expects that the depositor (msg.sender) has already approved the Reward escrow contract
    /// to spend the the amount being escrowed.
    function createEscrowEntry(
        address _beneficiary,
        uint256 _deposit,
        uint256 _duration,
        uint256 _earlyVestingFee
    ) external;

    /// @notice Add a new vesting entry at a given time and quantity to an account's schedule.
    /// @dev A call to this should accompany a previous successful call to kwenta.transfer(rewardEscrow, amount),
    /// to ensure that when the funds are withdrawn, there is enough balance.
    /// This is only callable by the staking rewards contract
    /// The duration defaults to 1 year, and the early vesting fee to 90%
    /// @param _account The account to append a new vesting entry to.
    /// @param _quantity The quantity of KWENTA that will be escrowed.
    function appendVestingEntry(address _account, uint256 _quantity) external;

    /// @notice Transfer multiple entries from one account to another
    ///  Sufficient escrowed KWENTA must be unstaked for the transfer to succeed
    /// @param _from The account to transfer the entries from
    /// @param _to The account to transfer the entries to
    /// @param _entryIDs a list of the ids of the entries to transfer
    function bulkTransferFrom(address _from, address _to, uint256[] calldata _entryIDs) external;

    /// @dev Triggers stopped state
    function pauseRewardEscrow() external;

    /// @dev Returns to normal state.
    function unpauseRewardEscrow() external;

    /*///////////////////////////////////////////////////////////////
                                EVENTS
    ///////////////////////////////////////////////////////////////*/

    /// @notice emitted when an escrow entry is vested
    /// @param beneficiary The account that was vested to
    /// @param value The amount of KWENTA that was vested
    event Vested(address indexed beneficiary, uint256 value);

    /// @notice emitted when an escrow entry is created
    /// @param beneficiary The account that gets the entry
    /// @param value The amount of KWENTA that was escrowed
    /// @param duration The duration in seconds of the vesting entry
    /// @param entryID The id of the vesting entry
    /// @param earlyVestingFee The early vesting fee of the vesting entry
    event VestingEntryCreated(
        address indexed beneficiary,
        uint256 value,
        uint256 duration,
        uint256 entryID,
        uint256 earlyVestingFee
    );

    /// @notice emitted when the staking rewards contract is set
    /// @param stakingRewards The address of the staking rewards contract
    event StakingRewardsSet(address stakingRewards);

    /// @notice emitted when the escrow migrator contract is set
    /// @param escrowMigrator The address of the escrow migrator contract
    event EscrowMigratorSet(address escrowMigrator);

    /// @notice emitted when the treasury DAO is set
    /// @param treasuryDAO The address of the treasury DAO
    event TreasuryDAOSet(address treasuryDAO);

    /// @notice emitted when the early vest fee is sent to the treasury and notifier
    /// @param amountToTreasury The amount of KWENTA sent to the treasury
    /// @param amountToNotifier The amount of KWENTA sent to the notifier
    event EarlyVestFeeSent(uint256 amountToTreasury, uint256 amountToNotifier);

    /*//////////////////////////////////////////////////////////////
                                ERRORS
    //////////////////////////////////////////////////////////////*/

    /// @notice Thrown when attempting to bulk transfer from and to the same address
    error CannotTransferToSelf();

    /// @notice Insufficient unstaked escrow to facilitate transfer
    /// @param escrowAmount the amount of escrow attempted to transfer
    /// @param unstakedBalance the amount of unstaked escrow available
    error InsufficientUnstakedBalance(uint256 escrowAmount, uint256 unstakedBalance);

    /// @notice Attempted to set entry early vesting fee beyond 100%
    error EarlyVestingFeeTooHigh();

    /// @notice cannot mint entries with early vesting fee below the minimum
    error EarlyVestingFeeTooLow();

    /// @notice error someone other than staking rewards calls an onlyStakingRewards function
    error OnlyStakingRewards();

    /// @notice error someone other than escrow migrator calls an onlyEscrowMigrator function
    error OnlyEscrowMigrator();

    /// @notice staking rewards is only allowed to be set once
    error StakingRewardsAlreadySet();

    /// @notice cannot set this value to the zero address
    error ZeroAddress();

    /// @notice cannot mint entries with zero escrow
    error ZeroAmount();

    /// @notice Cannot escrow with 0 duration OR above max_duration
    error InvalidDuration();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (token/ERC721/extensions/ERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../ERC721Upgradeable.sol";
import "./IERC721EnumerableUpgradeable.sol";
import "../../../proxy/utils/Initializable.sol";

/**
 * @dev This implements an optional extension of {ERC721} defined in the EIP that adds
 * enumerability of all the token ids in the contract as well as all token ids owned by each
 * account.
 */
abstract contract ERC721EnumerableUpgradeable is Initializable, ERC721Upgradeable, IERC721EnumerableUpgradeable {
    function __ERC721Enumerable_init() internal onlyInitializing {
    }

    function __ERC721Enumerable_init_unchained() internal onlyInitializing {
    }
    // Mapping from owner to list of owned token IDs
    mapping(address => mapping(uint256 => uint256)) private _ownedTokens;

    // Mapping from token ID to index of the owner tokens list
    mapping(uint256 => uint256) private _ownedTokensIndex;

    // Array with all token ids, used for enumeration
    uint256[] private _allTokens;

    // Mapping from token id to position in the allTokens array
    mapping(uint256 => uint256) private _allTokensIndex;

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(IERC165Upgradeable, ERC721Upgradeable) returns (bool) {
        return interfaceId == type(IERC721EnumerableUpgradeable).interfaceId || super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721Enumerable-tokenOfOwnerByIndex}.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721Upgradeable.balanceOf(owner), "ERC721Enumerable: owner index out of bounds");
        return _ownedTokens[owner][index];
    }

    /**
     * @dev See {IERC721Enumerable-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _allTokens.length;
    }

    /**
     * @dev See {IERC721Enumerable-tokenByIndex}.
     */
    function tokenByIndex(uint256 index) public view virtual override returns (uint256) {
        require(index < ERC721EnumerableUpgradeable.totalSupply(), "ERC721Enumerable: global index out of bounds");
        return _allTokens[index];
    }

    /**
     * @dev See {ERC721-_beforeTokenTransfer}.
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual override {
        super._beforeTokenTransfer(from, to, firstTokenId, batchSize);

        if (batchSize > 1) {
            // Will only trigger during construction. Batch transferring (minting) is not available afterwards.
            revert("ERC721Enumerable: consecutive transfers not supported");
        }

        uint256 tokenId = firstTokenId;

        if (from == address(0)) {
            _addTokenToAllTokensEnumeration(tokenId);
        } else if (from != to) {
            _removeTokenFromOwnerEnumeration(from, tokenId);
        }
        if (to == address(0)) {
            _removeTokenFromAllTokensEnumeration(tokenId);
        } else if (to != from) {
            _addTokenToOwnerEnumeration(to, tokenId);
        }
    }

    /**
     * @dev Private function to add a token to this extension's ownership-tracking data structures.
     * @param to address representing the new owner of the given token ID
     * @param tokenId uint256 ID of the token to be added to the tokens list of the given address
     */
    function _addTokenToOwnerEnumeration(address to, uint256 tokenId) private {
        uint256 length = ERC721Upgradeable.balanceOf(to);
        _ownedTokens[to][length] = tokenId;
        _ownedTokensIndex[tokenId] = length;
    }

    /**
     * @dev Private function to add a token to this extension's token tracking data structures.
     * @param tokenId uint256 ID of the token to be added to the tokens list
     */
    function _addTokenToAllTokensEnumeration(uint256 tokenId) private {
        _allTokensIndex[tokenId] = _allTokens.length;
        _allTokens.push(tokenId);
    }

    /**
     * @dev Private function to remove a token from this extension's ownership-tracking data structures. Note that
     * while the token is not assigned a new owner, the `_ownedTokensIndex` mapping is _not_ updated: this allows for
     * gas optimizations e.g. when performing a transfer operation (avoiding double writes).
     * This has O(1) time complexity, but alters the order of the _ownedTokens array.
     * @param from address representing the previous owner of the given token ID
     * @param tokenId uint256 ID of the token to be removed from the tokens list of the given address
     */
    function _removeTokenFromOwnerEnumeration(address from, uint256 tokenId) private {
        // To prevent a gap in from's tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = ERC721Upgradeable.balanceOf(from) - 1;
        uint256 tokenIndex = _ownedTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary
        if (tokenIndex != lastTokenIndex) {
            uint256 lastTokenId = _ownedTokens[from][lastTokenIndex];

            _ownedTokens[from][tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
            _ownedTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index
        }

        // This also deletes the contents at the last position of the array
        delete _ownedTokensIndex[tokenId];
        delete _ownedTokens[from][lastTokenIndex];
    }

    /**
     * @dev Private function to remove a token from this extension's token tracking data structures.
     * This has O(1) time complexity, but alters the order of the _allTokens array.
     * @param tokenId uint256 ID of the token to be removed from the tokens list
     */
    function _removeTokenFromAllTokensEnumeration(uint256 tokenId) private {
        // To prevent a gap in the tokens array, we store the last token in the index of the token to delete, and
        // then delete the last slot (swap and pop).

        uint256 lastTokenIndex = _allTokens.length - 1;
        uint256 tokenIndex = _allTokensIndex[tokenId];

        // When the token to delete is the last token, the swap operation is unnecessary. However, since this occurs so
        // rarely (when the last minted token is burnt) that we still do the swap here to avoid the gas cost of adding
        // an 'if' statement (like in _removeTokenFromOwnerEnumeration)
        uint256 lastTokenId = _allTokens[lastTokenIndex];

        _allTokens[tokenIndex] = lastTokenId; // Move the last token to the slot of the to-delete token
        _allTokensIndex[lastTokenId] = tokenIndex; // Update the moved token's index

        // This also deletes the contents at the last position of the array
        delete _allTokensIndex[tokenId];
        _allTokens.pop();
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[46] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./OwnableUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which provides 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} and {acceptOwnership}.
 *
 * This module is used through inheritance. It will make available all functions
 * from parent (Ownable).
 */
abstract contract Ownable2StepUpgradeable is Initializable, OwnableUpgradeable {
    function __Ownable2Step_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable2Step_init_unchained() internal onlyInitializing {
    }
    address private _pendingOwner;

    event OwnershipTransferStarted(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Returns the address of the pending owner.
     */
    function pendingOwner() public view virtual returns (address) {
        return _pendingOwner;
    }

    /**
     * @dev Starts the ownership transfer of the contract to a new account. Replaces the pending transfer if there is one.
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual override onlyOwner {
        _pendingOwner = newOwner;
        emit OwnershipTransferStarted(owner(), newOwner);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`) and deletes any pending owner.
     * Internal function without access restriction.
     */
    function _transferOwnership(address newOwner) internal virtual override {
        delete _pendingOwner;
        super._transferOwnership(newOwner);
    }

    /**
     * @dev The new owner accepts the ownership transfer.
     */
    function acceptOwnership() external {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract PausableUpgradeable is Initializable, ContextUpgradeable {
    /**
     * @dev Emitted when the pause is triggered by `account`.
     */
    event Paused(address account);

    /**
     * @dev Emitted when the pause is lifted by `account`.
     */
    event Unpaused(address account);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    function __Pausable_init() internal onlyInitializing {
        __Pausable_init_unchained();
    }

    function __Pausable_init_unchained() internal onlyInitializing {
        _paused = false;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        _requireNotPaused();
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        _requirePaused();
        _;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view virtual returns (bool) {
        return _paused;
    }

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        require(!paused(), "Pausable: paused");
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        require(paused(), "Pausable: not paused");
    }

    /**
     * @dev Triggers stopped state.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    function _pause() internal virtual whenNotPaused {
        _paused = true;
        emit Paused(_msgSender());
    }

    /**
     * @dev Returns to normal state.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    function _unpause() internal virtual whenPaused {
        _paused = false;
        emit Unpaused(_msgSender());
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;

import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../ERC1967/ERC1967UpgradeUpgradeable.sol";
import "./Initializable.sol";

/**
 * @dev An upgradeability mechanism designed for UUPS proxies. The functions included here can perform an upgrade of an
 * {ERC1967Proxy}, when this contract is set as the implementation behind such a proxy.
 *
 * A security mechanism ensures that an upgrade does not turn off upgradeability accidentally, although this risk is
 * reinstated if the upgrade retains upgradeability but removes the security mechanism, e.g. by replacing
 * `UUPSUpgradeable` with a custom implementation of upgrades.
 *
 * The {_authorizeUpgrade} function must be overridden to include access restriction to the upgrade mechanism.
 *
 * _Available since v4.1._
 */
abstract contract UUPSUpgradeable is Initializable, IERC1822ProxiableUpgradeable, ERC1967UpgradeUpgradeable {
    function __UUPSUpgradeable_init() internal onlyInitializing {
    }

    function __UUPSUpgradeable_init_unchained() internal onlyInitializing {
    }
    /// @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
    address private immutable __self = address(this);

    /**
     * @dev Check that the execution is being performed through a delegatecall call and that the execution context is
     * a proxy contract with an implementation (as defined in ERC1967) pointing to self. This should only be the case
     * for UUPS and transparent proxies that are using the current contract as their implementation. Execution of a
     * function through ERC1167 minimal proxies (clones) would not normally pass this test, but is not guaranteed to
     * fail.
     */
    modifier onlyProxy() {
        require(address(this) != __self, "Function must be called through delegatecall");
        require(_getImplementation() == __self, "Function must be called through active proxy");
        _;
    }

    /**
     * @dev Check that the execution is not being performed through a delegate call. This allows a function to be
     * callable on the implementing contract but not through proxies.
     */
    modifier notDelegated() {
        require(address(this) == __self, "UUPSUpgradeable: must not be called through delegatecall");
        _;
    }

    /**
     * @dev Implementation of the ERC1822 {proxiableUUID} function. This returns the storage slot used by the
     * implementation. It is used to validate the implementation's compatibility when performing an upgrade.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy. This is guaranteed by the `notDelegated` modifier.
     */
    function proxiableUUID() external view virtual override notDelegated returns (bytes32) {
        return _IMPLEMENTATION_SLOT;
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeTo(address newImplementation) external virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, new bytes(0), false);
    }

    /**
     * @dev Upgrade the implementation of the proxy to `newImplementation`, and subsequently execute the function call
     * encoded in `data`.
     *
     * Calls {_authorizeUpgrade}.
     *
     * Emits an {Upgraded} event.
     */
    function upgradeToAndCall(address newImplementation, bytes memory data) external payable virtual onlyProxy {
        _authorizeUpgrade(newImplementation);
        _upgradeToAndCallUUPS(newImplementation, data, true);
    }

    /**
     * @dev Function that should revert when `msg.sender` is not authorized to upgrade the contract. Called by
     * {upgradeTo} and {upgradeToAndCall}.
     *
     * Normally, this function will use an xref:access.adoc[access control] modifier such as {Ownable-onlyOwner}.
     *
     * ```solidity
     * function _authorizeUpgrade(address) internal override onlyOwner {}
     * ```
     */
    function _authorizeUpgrade(address newImplementation) internal virtual;

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT

pragma solidity ^0.8.0;

import "./IERC20.sol";

interface IKwenta is IERC20 {

    function mint(address account, uint amount) external;

    function burn(uint amount) external;

    function setSupplySchedule(address _supplySchedule) external;

}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IStakingRewardsV2 {
    /*//////////////////////////////////////////////////////////////
                                STRUCTS
    //////////////////////////////////////////////////////////////*/

    /// @notice A checkpoint for tracking values at a given timestamp
    struct Checkpoint {
        // The timestamp when the value was generated
        uint64 ts;
        // The block number when the value was generated
        uint64 blk;
        // The value of the checkpoint
        /// @dev will not overflow unless it value reaches 340 quintillion
        /// This number should be impossible to reach with the total supply of $KWENTA
        uint128 value;
    }

    /*///////////////////////////////////////////////////////////////
                                INITIALIZER
    ///////////////////////////////////////////////////////////////*/

    /// @notice Initializes the contract
    /// @param _owner: owner of this contract
    /// @dev this function should be called via proxy, not via direct contract interaction
    function initialize(address _owner) external;

    /*//////////////////////////////////////////////////////////////
                                Views
    //////////////////////////////////////////////////////////////*/
    // token state

    /// @dev returns staked tokens which will likely not be equal to total tokens
    /// in the contract since reward and staking tokens are the same
    /// @return total amount of tokens that are being staked
    function totalSupply() external view returns (uint256);

    // staking state

    /// @notice Returns the total number of staked tokens for a user
    /// the sum of all escrowed and non-escrowed tokens
    /// @param _account: address of potential staker
    /// @return amount of tokens staked by account
    function balanceOf(address _account) external view returns (uint256);

    /// @notice Getter function for number of staked escrow tokens
    /// @param _account address to check the escrowed tokens staked
    /// @return amount of escrowed tokens staked
    function escrowedBalanceOf(address _account) external view returns (uint256);

    /// @notice Getter function for number of staked non-escrow tokens
    /// @param _account address to check the non-escrowed tokens staked
    /// @return amount of non-escrowed tokens staked
    function nonEscrowedBalanceOf(address _account) external view returns (uint256);

    /// @notice Getter function for the total number of escrowed tokens that are not not staked
    /// @param _account: address to check
    /// @return amount of tokens escrowed but not staked
    function unstakedEscrowedBalanceOf(address _account) external view returns (uint256);

    /// @notice the period of time a user has to wait after staking to unstake
    function cooldownPeriod() external view returns (uint256);

    // rewards

    /// @notice calculate the total rewards for one duration based on the current rate
    /// @return rewards for the duration specified by rewardsDuration
    function getRewardForDuration() external view returns (uint256);

    /// @notice calculate running sum of reward per total tokens staked
    /// at this specific time
    /// @return running sum of reward per total tokens staked
    function rewardPerToken() external view returns (uint256);

    /// @notice calculate running sum of USDC reward per total tokens staked
    /// at this specific time
    /// @return running sum of USDC reward per total tokens staked
    function rewardPerTokenUSDC() external view returns (uint256);

    /// @notice get the last time a reward is applicable for a given user
    /// @return timestamp of the last time rewards are applicable
    function lastTimeRewardApplicable() external view returns (uint256);

    /// @notice determine how much reward token an account has earned thus far
    /// @param _account: address of account earned amount is being calculated for
    function earned(address _account) external view returns (uint256);

    /// @notice determine how much USDC reward an account has earned thus far
    /// @param _account: address of account earned amount is being calculated for
    function earnedUSDC(address _account) external view returns (uint256);

    // checkpointing

    /// @notice get the number of balances checkpoints for an account
    /// @param _account: address of account to check
    /// @return number of balances checkpoints
    function balancesCheckpointsLength(address _account) external view returns (uint256);

    /// @notice get the number of escrowed balance checkpoints for an account
    /// @param _account: address of account to check
    /// @return number of escrowed balance checkpoints
    function escrowedBalancesCheckpointsLength(address _account) external view returns (uint256);

    /// @notice get the number of total supply checkpoints
    /// @return number of total supply checkpoints
    function totalSupplyCheckpointsLength() external view returns (uint256);

    /// @notice get a users balance at a given timestamp
    /// @param _account: address of account to check
    /// @param _timestamp: timestamp to check
    /// @return balance at given timestamp
    /// @dev if called with a timestamp that equals the current block timestamp, then the function might return inconsistent
    /// values as further transactions changing the balances can still occur within the same block.
    function balanceAtTime(address _account, uint256 _timestamp) external view returns (uint256);

    /// @notice get a users escrowed balance at a given timestamp
    /// @param _account: address of account to check
    /// @param _timestamp: timestamp to check
    /// @return escrowed balance at given timestamp
    /// @dev if called with a timestamp that equals the current block timestamp, then the function might return inconsistent
    /// values as further transactions changing the balances can still occur within the same block.
    function escrowedBalanceAtTime(address _account, uint256 _timestamp)
        external
        view
        returns (uint256);

    /// @notice get the total supply at a given timestamp
    /// @param _timestamp: timestamp to check
    /// @return total supply at given timestamp
    /// @dev if called with a timestamp that equals the current block timestamp, then the function might return inconsistent
    /// values as further transactions changing the balances can still occur within the same block.
    function totalSupplyAtTime(uint256 _timestamp) external view returns (uint256);

    /*//////////////////////////////////////////////////////////////
                                Mutative
    //////////////////////////////////////////////////////////////*/
    // Staking/Unstaking

    /// @notice stake token
    /// @param _amount: amount to stake
    /// @dev updateReward() called prior to function logic
    function stake(uint256 _amount) external;

    /// @notice unstake token
    /// @param _amount: amount to unstake
    /// @dev updateReward() called prior to function logic
    function unstake(uint256 _amount) external;

    /// @notice stake escrowed token
    /// @param _amount: amount to stake
    /// @dev updateReward() called prior to function logic
    function stakeEscrow(uint256 _amount) external;

    /// @notice unstake escrowed token
    /// @param _amount: amount to unstake
    /// @dev updateReward() called prior to function logic
    function unstakeEscrow(uint256 _amount) external;

    /// @notice unstake escrowed token skipping the cooldown wait period
    /// @param _account: address of account to unstake from
    /// @param _amount: amount to unstake
    /// @dev this function is used to allow tokens to be vested at any time by RewardEscrowV2
    function unstakeEscrowSkipCooldown(address _account, uint256 _amount) external;

    /// @notice unstake all available staked non-escrowed tokens and
    /// claim any rewards
    function exit() external;

    // claim rewards

    /// @notice caller claims any rewards generated from staking
    /// @dev rewards are escrowed in RewardEscrow
    /// @dev updateReward() called prior to function logic
    function getReward() external;

    /// @notice claim rewards for an account and stake them
    function compound() external;

    // delegation

    /// @notice approve an operator to collect rewards and stake escrow on behalf of the sender
    /// @param operator: address of operator to approve
    /// @param approved: whether or not to approve the operator
    function approveOperator(address operator, bool approved) external;

    /// @notice stake escrowed token on behalf of another account
    /// @param _account: address of account to stake on behalf of
    /// @param _amount: amount to stake
    function stakeEscrowOnBehalf(address _account, uint256 _amount) external;

    /// @notice caller claims any rewards generated from staking on behalf of another account
    /// The rewards will be escrowed in RewardEscrow with the account as the beneficiary
    /// @param _account: address of account to claim rewards for
    function getRewardOnBehalf(address _account) external;

    /// @notice claim and stake rewards on behalf of another account
    /// @param _account: address of account to claim and stake rewards for
    function compoundOnBehalf(address _account) external;

    // settings

    /// @notice configure reward rate
    /// @param _reward: amount of token to be distributed over a period
    /// @param _reward: amount of usdc to be distributed over a period
    /// @dev updateReward() called prior to function logic (with zero address)
    function notifyRewardAmount(uint256 _reward, uint256 _rewardUsdc) external;

    /// @notice set rewards duration
    /// @param _rewardsDuration: denoted in seconds
    function setRewardsDuration(uint256 _rewardsDuration) external;

    /// @notice set unstaking cooldown period
    /// @param _cooldownPeriod: denoted in seconds
    function setCooldownPeriod(uint256 _cooldownPeriod) external;

    // pausable

    /// @dev Triggers stopped state
    function pauseStakingRewards() external;

    /// @dev Returns to normal state.
    function unpauseStakingRewards() external;

    // misc.

    /// @notice added to support recovering LP Rewards from other systems
    /// such as BAL to be distributed to holders
    /// @param tokenAddress: address of token to be recovered
    /// @param tokenAmount: amount of token to be recovered
    function recoverERC20(address tokenAddress, uint256 tokenAmount) external;

    /*///////////////////////////////////////////////////////////////
                                EVENTS
    ///////////////////////////////////////////////////////////////*/

    /// @notice update reward rate
    /// @param reward: kwenta amount to be distributed over applicable rewards duration
    /// @param rewardUsdc: usdc amount to be distributed over applicable rewards duration
    event RewardAdded(uint256 reward, uint256 rewardUsdc);

    /// @notice emitted when user stakes tokens
    /// @param user: staker address
    /// @param amount: amount staked
    event Staked(address indexed user, uint256 amount);

    /// @notice emitted when user unstakes tokens
    /// @param user: address of user unstaking
    /// @param amount: amount unstaked
    event Unstaked(address indexed user, uint256 amount);

    /// @notice emitted when escrow staked
    /// @param user: owner of escrowed tokens address
    /// @param amount: amount staked
    event EscrowStaked(address indexed user, uint256 amount);

    /// @notice emitted when staked escrow tokens are unstaked
    /// @param user: owner of escrowed tokens address
    /// @param amount: amount unstaked
    event EscrowUnstaked(address user, uint256 amount);

    /// @notice emitted when user claims rewards
    /// @param user: address of user claiming rewards
    /// @param reward: amount of reward token claimed
    event RewardPaid(address indexed user, uint256 reward);

    /// @notice emitted when user claims USDC rewards
    /// @param user: address of user claiming rewards
    /// @param reward: amount of USDC token claimed
    event RewardPaidUSDC(address indexed user, uint256 reward);

    /// @notice emitted when rewards duration changes
    /// @param newDuration: denoted in seconds
    event RewardsDurationUpdated(uint256 newDuration);

    /// @notice emitted when tokens are recovered from this contract
    /// @param token: address of token recovered
    /// @param amount: amount of token recovered
    event Recovered(address token, uint256 amount);

    /// @notice emitted when the unstaking cooldown period is updated
    /// @param cooldownPeriod: the new unstaking cooldown period
    event CooldownPeriodUpdated(uint256 cooldownPeriod);

    /// @notice emitted when an operator is approved
    /// @param owner: owner of tokens
    /// @param operator: address of operator
    /// @param approved: whether or not operator is approved
    event OperatorApproved(address owner, address operator, bool approved);

    /*//////////////////////////////////////////////////////////////
                                ERRORS
    //////////////////////////////////////////////////////////////*/

    /// @notice error someone other than reward escrow calls an onlyRewardEscrow function
    error OnlyRewardEscrow();

    /// @notice error someone other than the rewards notifier calls an onlyRewardsNotifier function
    error OnlyRewardsNotifier();

    /// @notice cannot set this value to the zero address
    error ZeroAddress();

    /// @notice error when user tries to stake/unstake 0 tokens
    error AmountZero();

    /// @notice the user does not have enough tokens to unstake that amount
    /// @param availableBalance: amount of tokens available to withdraw
    error InsufficientBalance(uint256 availableBalance);

    /// @notice error when trying to stakeEscrow more than the unstakedEscrow available
    /// @param unstakedEscrow amount of unstaked escrow
    error InsufficientUnstakedEscrow(uint256 unstakedEscrow);

    /// @notice previous rewards period must be complete before changing the duration for the new period
    error RewardsPeriodNotComplete();

    /// @notice recovering the staking token is not allowed
    error CannotRecoverStakingToken();

    /// @notice recovering the usdc reward token is not allowed
    error CannotRecoverRewardToken();

    /// @notice error when user tries unstake during the cooldown period
    /// @param canUnstakeAt timestamp when user can unstake
    error MustWaitForUnlock(uint256 canUnstakeAt);

    /// @notice error when trying to set a rewards duration that is too short
    error RewardsDurationCannotBeZero();

    /// @notice error when trying to set a cooldown period below the minimum
    /// @param minCooldownPeriod minimum cooldown period
    error CooldownPeriodTooLow(uint256 minCooldownPeriod);

    /// @notice error when trying to set a cooldown period above the maximum
    /// @param maxCooldownPeriod maximum cooldown period
    error CooldownPeriodTooHigh(uint256 maxCooldownPeriod);

    /// @notice the caller is not approved to take this action
    error NotApproved();

    /// @notice attempted to approve self as an operator
    error CannotApproveSelf();
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.19;

interface IEscrowMigrator {
    /*//////////////////////////////////////////////////////////////
                           STRUCTS AND ENUMS
    //////////////////////////////////////////////////////////////*/

    /// @notice A vesting entry contains the data for each escrow entry
    struct VestingEntry {
        // The amount of KWENTA stored in this vesting entry
        uint248 escrowAmount;
        // Whether the entry has been migrated to v2
        bool migrated;
    }

    /// @notice A vesting entry contains the data for each escrow entry
    struct VestingEntryWithID {
        // The entryID associated with this vesting entry
        uint256 entryID;
        // The amount of KWENTA stored in this vesting entry
        uint256 escrowAmount;
        // Whether the entry has been migrated to v2
        bool migrated;
    }

    /*///////////////////////////////////////////////////////////////
                                INITIALIZER
    ///////////////////////////////////////////////////////////////*/

    /// @notice Initializes the contract
    /// @param _owner The address of the owner of this contract
    /// @param _treasuryDAO The address of the treasury DAO
    /// @dev this function should be called via proxy, not via direct contract interaction
    function initialize(address _owner, address _treasuryDAO) external;

    /*//////////////////////////////////////////////////////////////
                                 VIEWS
    //////////////////////////////////////////////////////////////*/

    /// @notice The deadline for migration, set to 2 weeks from when a user initializes
    function MIGRATION_DEADLINE() external view returns (uint256);

    /// @notice Get the total number of registered vesting entries for a given account
    /// @param _account The address of the account to query
    /// @return The number of vesting entries for the given account
    function numberOfRegisteredEntries(address _account) external view returns (uint256);

    /// @notice Get the total number of migrated vesting entries for a given account
    /// @param _account The address of the account to query
    /// @return The number of vesting entries for the given account
    /// @dev WARNING: loop is potentially limitless - could revert with out of gas error if called on-chain
    function numberOfMigratedEntries(address _account) external view returns (uint256);

    /// @notice Get the total escrowed registerd for an account
    /// @param _account The address of the account to query
    /// @return total the total escrow registered for the given account
    /// @dev WARNING: loop is potentially limitless - could revert with out of gas error if called on-chain
    function totalEscrowRegistered(address _account) external view returns (uint256 total);

    /// @notice Get the total escrowed migrated for an account
    /// @param _account The address of the account to query
    /// @return total the total escrow migrated for the given account
    /// @dev WARNING: loop is potentially limitless - could revert with out of gas error if called on-chain
    function totalEscrowMigrated(address _account) external view returns (uint256 total);

    /// @notice Get the total escrow that has been registered but not migrated for a user
    /// @param _account The address of the account to query
    /// @return total the total registered but non-migrated escrow for the given account
    /// @dev WARNING: loop is potentially limitless - could revert with out of gas error if called on-chain
    function totalEscrowUnmigrated(address _account) external view returns (uint256 total);

    /// @notice the amount a given user needs to pay to migrate all currently vested
    /// registered entries. The user should approve the escrow migrator for at least
    /// this amount before beginning the migration step
    /// @param _account The address of the account to query
    /// @return toPay the amount the user needs to pay to migrate all currently vested
    function toPay(address _account) external view returns (uint256);

    /// @notice Get the vesting entry data for a given account and entry ID
    /// @param _account The address of the account to query
    /// @param _entryID The ID of the entry to query
    function getRegisteredVestingEntry(address _account, uint256 _entryID)
        external
        view
        returns (uint256 escrowAmount, bool migrated);

    /// @notice get a list of vesting entries for a given account
    /// @param _account The address of the account to query
    /// @param _index The _index of the first entry to query
    /// @param _pageSize The number of entries to query
    function getRegisteredVestingSchedules(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (VestingEntryWithID[] memory);

    /// @notice get a list of vesting entry IDs for a given account
    /// @param _account The address of the account to query
    /// @param _index The index of the first entry to query
    /// @param _pageSize The number of entries to query
    function getRegisteredVestingEntryIDs(address _account, uint256 _index, uint256 _pageSize)
        external
        view
        returns (uint256[] memory);

    /*//////////////////////////////////////////////////////////////
                                 STEP 0
    //////////////////////////////////////////////////////////////*/

    /// @notice claim any remaining StakingRewards V1 rewards
    /// This should be done before the migration process can begin

    /*//////////////////////////////////////////////////////////////
                                 STEP 1
    //////////////////////////////////////////////////////////////*/

    /// @notice Step 1 in the migration process - register any entries to be migrated
    /// @param _entryIDs: The entries to register for migration
    /// @dev WARNING: If the user vests non-registerd entries after this step, they will have to pay extra for the migration.
    /// The user should register all entries they want to migrate BEFORE vesting, otherwise it will not be possible to migrate them.
    /// @dev WARNING: To reiterate, if the user vests any entries that are not registered after initiating, they will have
    /// to pay extra for the migration. This is because the user will have to pay for the migration based on the total vested balance at the time of
    /// migration - but only registered entries will be created for them on V2
    /// @param _entryIDs: The entries to register for migration
    function registerEntries(uint256[] calldata _entryIDs) external;

    /*//////////////////////////////////////////////////////////////
                                 STEP 2
    //////////////////////////////////////////////////////////////*/

    /// @notice Vest any registered entries and approve the EscrowMigrator contract
    /// to spend liquid at least the `toPay` amount of $KWENTA
    /// @notice WARNING: DO NOT VEST ANY NON-REGISTERED ENTRIES

    /*//////////////////////////////////////////////////////////////
                                 STEP 3
    //////////////////////////////////////////////////////////////*/

    /// @notice Step 3 in the migration process - migrate the registered entries
    /// @notice The user MUST vest any registered entries before they can be migrated
    /// @notice The user MUST NOT vest any non-registered entries before this step
    /// @param _to: The address to migrate the entries to
    /// @param _entryIDs: The entries to migrate
    function migrateEntries(address _to, uint256[] calldata _entryIDs) external;

    /*//////////////////////////////////////////////////////////////
                          INTEGRATOR MIGRATION
    //////////////////////////////////////////////////////////////*/

    /// @notice step 0 - claim any remaining StakingRewards V1 rewards

    /// @notice step 1 - initiate & register entries for migration
    /// @param _integrator: The address of the integrator to register entries for
    /// @param _entryIDs: The entries to register for migration
    /// @dev WARNING: If the integrator vests non-registerd entries after this step, they will have to pay extra for the migration.
    function registerIntegratorEntries(address _integrator, uint256[] calldata _entryIDs)
        external;

    /// @notice step 2 - vest all registered entries via the integartor, pulling the early vested KWENTA to the beneficiary's address.
    /// Then the beneficiary must approve the EscrowMigrator contract for at least the integrators `toPay` amount.

    /// @notice step 3 - migrate all registered & vested entries
    /// @param _integrator: The address of the integrator to migrate entries for
    /// @param _to: The address to migrate the entries to
    /// @param _entryIDs: The entries to migrate
    function migrateIntegratorEntries(
        address _integrator,
        address _to,
        uint256[] calldata _entryIDs
    ) external;

    /*//////////////////////////////////////////////////////////////
                             FUND RECOVERY
    //////////////////////////////////////////////////////////////*/

    /// @notice Allows the owner to change the treasury DAO address
    /// @param _newTreasuryDAO The address of the new treasury DAO
    function setTreasuryDAO(address _newTreasuryDAO) external;

    /// @notice Account for locked funds for a list of expired migrators
    /// @param _expiredMigrators The addresses of the expired migrators
    /// @dev warning - may fail due to unbounded loop for certain users
    function updateTotalLocked(address[] memory _expiredMigrators) external;

    /// @notice Account for locked funds for a single expired migrator
    /// @param _expiredMigrator The address of the expired migrator
    /// @dev warning - may fail due to unbounded loop for certain users
    function updateTotalLocked(address _expiredMigrator) external;

    /// @notice Withdraw excess funds from the contract to the treasury
    function recoverExcessFunds() external;

    /*///////////////////////////////////////////////////////////////
                                PAUSABLE
    //////////////////////////////////////////////////////////////*/

    /// @notice Pause the reward escrow contract
    function pauseEscrowMigrator() external;

    /// @notice Unpause the reward escrow contract
    function unpauseEscrowMigrator() external;

    /*//////////////////////////////////////////////////////////////
                                ERRORS
    //////////////////////////////////////////////////////////////*/

    /// @notice cannot set this value to the zero address
    error ZeroAddress();

    /// @notice the caller is not approved to take this action
    error NotApproved();

    /// @notice the user may not begin the migration process if they have nothing to migrate
    error NoEscrowBalanceToMigrate();

    /// @notice step 2 canont be called until the user has initiated via step 1
    error MustBeInitiated();

    /// @notice a user must complete migrating within the specified time window after initiating
    error DeadlinePassed();
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.2) (token/ERC721/ERC721.sol)

pragma solidity ^0.8.0;

import "./IERC721Upgradeable.sol";
import "./IERC721ReceiverUpgradeable.sol";
import "./extensions/IERC721MetadataUpgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/ContextUpgradeable.sol";
import "../../utils/StringsUpgradeable.sol";
import "../../utils/introspection/ERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.sol";

/**
 * @dev Implementation of https://eips.ethereum.org/EIPS/eip-721[ERC721] Non-Fungible Token Standard, including
 * the Metadata extension, but not including the Enumerable extension, which is available separately as
 * {ERC721Enumerable}.
 */
contract ERC721Upgradeable is Initializable, ContextUpgradeable, ERC165Upgradeable, IERC721Upgradeable, IERC721MetadataUpgradeable {
    using AddressUpgradeable for address;
    using StringsUpgradeable for uint256;

    // Token name
    string private _name;

    // Token symbol
    string private _symbol;

    // Mapping from token ID to owner address
    mapping(uint256 => address) private _owners;

    // Mapping owner address to token count
    mapping(address => uint256) private _balances;

    // Mapping from token ID to approved address
    mapping(uint256 => address) private _tokenApprovals;

    // Mapping from owner to operator approvals
    mapping(address => mapping(address => bool)) private _operatorApprovals;

    /**
     * @dev Initializes the contract by setting a `name` and a `symbol` to the token collection.
     */
    function __ERC721_init(string memory name_, string memory symbol_) internal onlyInitializing {
        __ERC721_init_unchained(name_, symbol_);
    }

    function __ERC721_init_unchained(string memory name_, string memory symbol_) internal onlyInitializing {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override(ERC165Upgradeable, IERC165Upgradeable) returns (bool) {
        return
            interfaceId == type(IERC721Upgradeable).interfaceId ||
            interfaceId == type(IERC721MetadataUpgradeable).interfaceId ||
            super.supportsInterface(interfaceId);
    }

    /**
     * @dev See {IERC721-balanceOf}.
     */
    function balanceOf(address owner) public view virtual override returns (uint256) {
        require(owner != address(0), "ERC721: address zero is not a valid owner");
        return _balances[owner];
    }

    /**
     * @dev See {IERC721-ownerOf}.
     */
    function ownerOf(uint256 tokenId) public view virtual override returns (address) {
        address owner = _ownerOf(tokenId);
        require(owner != address(0), "ERC721: invalid token ID");
        return owner;
    }

    /**
     * @dev See {IERC721Metadata-name}.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev See {IERC721Metadata-symbol}.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev See {IERC721Metadata-tokenURI}.
     */
    function tokenURI(uint256 tokenId) public view virtual override returns (string memory) {
        _requireMinted(tokenId);

        string memory baseURI = _baseURI();
        return bytes(baseURI).length > 0 ? string(abi.encodePacked(baseURI, tokenId.toString())) : "";
    }

    /**
     * @dev Base URI for computing {tokenURI}. If set, the resulting URI for each
     * token will be the concatenation of the `baseURI` and the `tokenId`. Empty
     * by default, can be overridden in child contracts.
     */
    function _baseURI() internal view virtual returns (string memory) {
        return "";
    }

    /**
     * @dev See {IERC721-approve}.
     */
    function approve(address to, uint256 tokenId) public virtual override {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        require(to != owner, "ERC721: approval to current owner");

        require(
            _msgSender() == owner || isApprovedForAll(owner, _msgSender()),
            "ERC721: approve caller is not token owner or approved for all"
        );

        _approve(to, tokenId);
    }

    /**
     * @dev See {IERC721-getApproved}.
     */
    function getApproved(uint256 tokenId) public view virtual override returns (address) {
        _requireMinted(tokenId);

        return _tokenApprovals[tokenId];
    }

    /**
     * @dev See {IERC721-setApprovalForAll}.
     */
    function setApprovalForAll(address operator, bool approved) public virtual override {
        _setApprovalForAll(_msgSender(), operator, approved);
    }

    /**
     * @dev See {IERC721-isApprovedForAll}.
     */
    function isApprovedForAll(address owner, address operator) public view virtual override returns (bool) {
        return _operatorApprovals[owner][operator];
    }

    /**
     * @dev See {IERC721-transferFrom}.
     */
    function transferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        //solhint-disable-next-line max-line-length
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");

        _transfer(from, to, tokenId);
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId
    ) public virtual override {
        safeTransferFrom(from, to, tokenId, "");
    }

    /**
     * @dev See {IERC721-safeTransferFrom}.
     */
    function safeTransferFrom(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) public virtual override {
        require(_isApprovedOrOwner(_msgSender(), tokenId), "ERC721: caller is not token owner or approved");
        _safeTransfer(from, to, tokenId, data);
    }

    /**
     * @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.
     *
     * `data` is additional data, it has no specified format and it is sent in call to `to`.
     *
     * This internal function is equivalent to {safeTransferFrom}, and can be used to e.g.
     * implement alternative mechanisms to perform token transfer, such as signature-based.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `tokenId` token must exist and be owned by `from`.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeTransfer(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _transfer(from, to, tokenId);
        require(_checkOnERC721Received(from, to, tokenId, data), "ERC721: transfer to non ERC721Receiver implementer");
    }

    /**
     * @dev Returns the owner of the `tokenId`. Does NOT revert if token doesn't exist
     */
    function _ownerOf(uint256 tokenId) internal view virtual returns (address) {
        return _owners[tokenId];
    }

    /**
     * @dev Returns whether `tokenId` exists.
     *
     * Tokens can be managed by their owner or approved accounts via {approve} or {setApprovalForAll}.
     *
     * Tokens start existing when they are minted (`_mint`),
     * and stop existing when they are burned (`_burn`).
     */
    function _exists(uint256 tokenId) internal view virtual returns (bool) {
        return _ownerOf(tokenId) != address(0);
    }

    /**
     * @dev Returns whether `spender` is allowed to manage `tokenId`.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     */
    function _isApprovedOrOwner(address spender, uint256 tokenId) internal view virtual returns (bool) {
        address owner = ERC721Upgradeable.ownerOf(tokenId);
        return (spender == owner || isApprovedForAll(owner, spender) || getApproved(tokenId) == spender);
    }

    /**
     * @dev Safely mints `tokenId` and transfers it to `to`.
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - If `to` refers to a smart contract, it must implement {IERC721Receiver-onERC721Received}, which is called upon a safe transfer.
     *
     * Emits a {Transfer} event.
     */
    function _safeMint(address to, uint256 tokenId) internal virtual {
        _safeMint(to, tokenId, "");
    }

    /**
     * @dev Same as {xref-ERC721-_safeMint-address-uint256-}[`_safeMint`], with an additional `data` parameter which is
     * forwarded in {IERC721Receiver-onERC721Received} to contract recipients.
     */
    function _safeMint(
        address to,
        uint256 tokenId,
        bytes memory data
    ) internal virtual {
        _mint(to, tokenId);
        require(
            _checkOnERC721Received(address(0), to, tokenId, data),
            "ERC721: transfer to non ERC721Receiver implementer"
        );
    }

    /**
     * @dev Mints `tokenId` and transfers it to `to`.
     *
     * WARNING: Usage of this method is discouraged, use {_safeMint} whenever possible
     *
     * Requirements:
     *
     * - `tokenId` must not exist.
     * - `to` cannot be the zero address.
     *
     * Emits a {Transfer} event.
     */
    function _mint(address to, uint256 tokenId) internal virtual {
        require(to != address(0), "ERC721: mint to the zero address");
        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId, 1);

        // Check that tokenId was not minted by `_beforeTokenTransfer` hook
        require(!_exists(tokenId), "ERC721: token already minted");

        unchecked {
            // Will not overflow unless all 2**256 token ids are minted to the same owner.
            // Given that tokens are minted one by one, it is impossible in practice that
            // this ever happens. Might change if we allow batch minting.
            // The ERC fails to describe this case.
            _balances[to] += 1;
        }

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

        _afterTokenTransfer(address(0), to, tokenId, 1);
    }

    /**
     * @dev Destroys `tokenId`.
     * The approval is cleared when the token is burned.
     * This is an internal function that does not check if the sender is authorized to operate on the token.
     *
     * Requirements:
     *
     * - `tokenId` must exist.
     *
     * Emits a {Transfer} event.
     */
    function _burn(uint256 tokenId) internal virtual {
        address owner = ERC721Upgradeable.ownerOf(tokenId);

        _beforeTokenTransfer(owner, address(0), tokenId, 1);

        // Update ownership in case tokenId was transferred by `_beforeTokenTransfer` hook
        owner = ERC721Upgradeable.ownerOf(tokenId);

        // Clear approvals
        delete _tokenApprovals[tokenId];

        unchecked {
            // Cannot overflow, as that would require more tokens to be burned/transferred
            // out than the owner initially received through minting and transferring in.
            _balances[owner] -= 1;
        }
        delete _owners[tokenId];

        emit Transfer(owner, address(0), tokenId);

        _afterTokenTransfer(owner, address(0), tokenId, 1);
    }

    /**
     * @dev Transfers `tokenId` from `from` to `to`.
     *  As opposed to {transferFrom}, this imposes no restrictions on msg.sender.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - `tokenId` token must be owned by `from`.
     *
     * Emits a {Transfer} event.
     */
    function _transfer(
        address from,
        address to,
        uint256 tokenId
    ) internal virtual {
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");
        require(to != address(0), "ERC721: transfer to the zero address");

        _beforeTokenTransfer(from, to, tokenId, 1);

        // Check that tokenId was not transferred by `_beforeTokenTransfer` hook
        require(ERC721Upgradeable.ownerOf(tokenId) == from, "ERC721: transfer from incorrect owner");

        // Clear approvals from the previous owner
        delete _tokenApprovals[tokenId];

        unchecked {
            // `_balances[from]` cannot overflow for the same reason as described in `_burn`:
            // `from`'s balance is the number of token held, which is at least one before the current
            // transfer.
            // `_balances[to]` could overflow in the conditions described in `_mint`. That would require
            // all 2**256 token ids to be minted, which in practice is impossible.
            _balances[from] -= 1;
            _balances[to] += 1;
        }
        _owners[tokenId] = to;

        emit Transfer(from, to, tokenId);

        _afterTokenTransfer(from, to, tokenId, 1);
    }

    /**
     * @dev Approve `to` to operate on `tokenId`
     *
     * Emits an {Approval} event.
     */
    function _approve(address to, uint256 tokenId) internal virtual {
        _tokenApprovals[tokenId] = to;
        emit Approval(ERC721Upgradeable.ownerOf(tokenId), to, tokenId);
    }

    /**
     * @dev Approve `operator` to operate on all of `owner` tokens
     *
     * Emits an {ApprovalForAll} event.
     */
    function _setApprovalForAll(
        address owner,
        address operator,
        bool approved
    ) internal virtual {
        require(owner != operator, "ERC721: approve to caller");
        _operatorApprovals[owner][operator] = approved;
        emit ApprovalForAll(owner, operator, approved);
    }

    /**
     * @dev Reverts if the `tokenId` has not been minted yet.
     */
    function _requireMinted(uint256 tokenId) internal view virtual {
        require(_exists(tokenId), "ERC721: invalid token ID");
    }

    /**
     * @dev Internal function to invoke {IERC721Receiver-onERC721Received} on a target address.
     * The call is not executed if the target address is not a contract.
     *
     * @param from address representing the previous owner of the given token ID
     * @param to target address that will receive the tokens
     * @param tokenId uint256 ID of the token to be transferred
     * @param data bytes optional data to send along with the call
     * @return bool whether the call correctly returned the expected magic value
     */
    function _checkOnERC721Received(
        address from,
        address to,
        uint256 tokenId,
        bytes memory data
    ) private returns (bool) {
        if (to.isContract()) {
            try IERC721ReceiverUpgradeable(to).onERC721Received(_msgSender(), from, tokenId, data) returns (bytes4 retval) {
                return retval == IERC721ReceiverUpgradeable.onERC721Received.selector;
            } catch (bytes memory reason) {
                if (reason.length == 0) {
                    revert("ERC721: transfer to non ERC721Receiver implementer");
                } else {
                    /// @solidity memory-safe-assembly
                    assembly {
                        revert(add(32, reason), mload(reason))
                    }
                }
            }
        } else {
            return true;
        }
    }

    /**
     * @dev Hook that is called before any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens will be transferred to `to`.
     * - When `from` is zero, the tokens will be minted for `to`.
     * - When `to` is zero, ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}

    /**
     * @dev Hook that is called after any token transfer. This includes minting and burning. If {ERC721Consecutive} is
     * used, the hook may be called as part of a consecutive (batch) mint, as indicated by `batchSize` greater than 1.
     *
     * Calling conditions:
     *
     * - When `from` and `to` are both non-zero, ``from``'s tokens were transferred to `to`.
     * - When `from` is zero, the tokens were minted for `to`.
     * - When `to` is zero, ``from``'s tokens were burned.
     * - `from` and `to` are never both zero.
     * - `batchSize` is non-zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(
        address from,
        address to,
        uint256 firstTokenId,
        uint256 batchSize
    ) internal virtual {}

    /**
     * @dev Unsafe write access to the balances, used by extensions that "mint" tokens using an {ownerOf} override.
     *
     * WARNING: Anyone calling this MUST ensure that the balances remain consistent with the ownership. The invariant
     * being that for any address `a` the value returned by `balanceOf(a)` must be equal to the number of tokens such
     * that `ownerOf(tokenId)` is `a`.
     */
    // solhint-disable-next-line func-name-mixedcase
    function __unsafe_increaseBalance(address account, uint256 amount) internal {
        _balances[account] += amount;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[44] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (token/ERC721/extensions/IERC721Enumerable.sol)

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional enumeration extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721EnumerableUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the total amount of tokens stored by the contract.
     */
    function totalSupply() external view returns (uint256);

    /**
     * @dev Returns a token ID owned by `owner` at a given `index` of its token list.
     * Use along with {balanceOf} to enumerate all of ``owner``'s tokens.
     */
    function tokenOfOwnerByIndex(address owner, uint256 index) external view returns (uint256);

    /**
     * @dev Returns a token ID at a given `index` of all the tokens stored by the contract.
     * Use along with {totalSupply} to enumerate all tokens.
     */
    function tokenByIndex(uint256 index) external view returns (uint256);
}

// 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 (last updated v4.7.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/ContextUpgradeable.sol";
import "../proxy/utils/Initializable.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 OwnableUpgradeable is Initializable, ContextUpgradeable {
    address private _owner;

    event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    function __Ownable_init() internal onlyInitializing {
        __Ownable_init_unchained();
    }

    function __Ownable_init_unchained() internal onlyInitializing {
        _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 _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 anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing 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 = _owner;
        _owner = newOwner;
        emit OwnershipTransferred(oldOwner, newOwner);
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[49] private __gap;
}

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

pragma solidity ^0.8.0;
import "../proxy/utils/Initializable.sol";

/**
 * @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 ContextUpgradeable is Initializable {
    function __Context_init() internal onlyInitializing {
    }

    function __Context_init_unchained() internal onlyInitializing {
    }
    function _msgSender() internal view virtual returns (address) {
        return msg.sender;
    }

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

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.5.0) (interfaces/draft-IERC1822.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC1822: Universal Upgradeable Proxy Standard (UUPS) documents a method for upgradeability through a simplified
 * proxy whose upgrades are fully controlled by the current implementation.
 */
interface IERC1822ProxiableUpgradeable {
    /**
     * @dev Returns the storage slot that the proxiable contract assumes is being used to store the implementation
     * address.
     *
     * IMPORTANT: A proxy pointing at a proxiable contract should not be considered proxiable itself, because this risks
     * bricking a proxy that upgrades to it, by delegating to itself until out of gas. Thus it is critical that this
     * function revert if invoked through a proxy.
     */
    function proxiableUUID() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (proxy/ERC1967/ERC1967Upgrade.sol)

pragma solidity ^0.8.2;

import "../beacon/IBeaconUpgradeable.sol";
import "../../interfaces/IERC1967Upgradeable.sol";
import "../../interfaces/draft-IERC1822Upgradeable.sol";
import "../../utils/AddressUpgradeable.sol";
import "../../utils/StorageSlotUpgradeable.sol";
import "../utils/Initializable.sol";

/**
 * @dev This abstract contract provides getters and event emitting update functions for
 * https://eips.ethereum.org/EIPS/eip-1967[EIP1967] slots.
 *
 * _Available since v4.1._
 *
 * @custom:oz-upgrades-unsafe-allow delegatecall
 */
abstract contract ERC1967UpgradeUpgradeable is Initializable, IERC1967Upgradeable {
    function __ERC1967Upgrade_init() internal onlyInitializing {
    }

    function __ERC1967Upgrade_init_unchained() internal onlyInitializing {
    }
    // This is the keccak-256 hash of "eip1967.proxy.rollback" subtracted by 1
    bytes32 private constant _ROLLBACK_SLOT = 0x4910fdfa16fed3260ed0e7147f7cc6da11a60208b5b9406d12a635614ffd9143;

    /**
     * @dev Storage slot with the address of the current implementation.
     * This is the keccak-256 hash of "eip1967.proxy.implementation" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;

    /**
     * @dev Returns the current implementation address.
     */
    function _getImplementation() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 implementation slot.
     */
    function _setImplementation(address newImplementation) private {
        require(AddressUpgradeable.isContract(newImplementation), "ERC1967: new implementation is not a contract");
        StorageSlotUpgradeable.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
    }

    /**
     * @dev Perform implementation upgrade
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeTo(address newImplementation) internal {
        _setImplementation(newImplementation);
        emit Upgraded(newImplementation);
    }

    /**
     * @dev Perform implementation upgrade with additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCall(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        _upgradeTo(newImplementation);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(newImplementation, data);
        }
    }

    /**
     * @dev Perform implementation upgrade with security checks for UUPS proxies, and additional setup call.
     *
     * Emits an {Upgraded} event.
     */
    function _upgradeToAndCallUUPS(
        address newImplementation,
        bytes memory data,
        bool forceCall
    ) internal {
        // Upgrades from old implementations will perform a rollback test. This test requires the new
        // implementation to upgrade back to the old, non-ERC1822 compliant, implementation. Removing
        // this special case will break upgrade paths from old UUPS implementation to new ones.
        if (StorageSlotUpgradeable.getBooleanSlot(_ROLLBACK_SLOT).value) {
            _setImplementation(newImplementation);
        } else {
            try IERC1822ProxiableUpgradeable(newImplementation).proxiableUUID() returns (bytes32 slot) {
                require(slot == _IMPLEMENTATION_SLOT, "ERC1967Upgrade: unsupported proxiableUUID");
            } catch {
                revert("ERC1967Upgrade: new implementation is not UUPS");
            }
            _upgradeToAndCall(newImplementation, data, forceCall);
        }
    }

    /**
     * @dev Storage slot with the admin of the contract.
     * This is the keccak-256 hash of "eip1967.proxy.admin" subtracted by 1, and is
     * validated in the constructor.
     */
    bytes32 internal constant _ADMIN_SLOT = 0xb53127684a568b3173ae13b9f8a6016e243e63b6e8ee1178d6a717850b5d6103;

    /**
     * @dev Returns the current admin.
     */
    function _getAdmin() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value;
    }

    /**
     * @dev Stores a new address in the EIP1967 admin slot.
     */
    function _setAdmin(address newAdmin) private {
        require(newAdmin != address(0), "ERC1967: new admin is the zero address");
        StorageSlotUpgradeable.getAddressSlot(_ADMIN_SLOT).value = newAdmin;
    }

    /**
     * @dev Changes the admin of the proxy.
     *
     * Emits an {AdminChanged} event.
     */
    function _changeAdmin(address newAdmin) internal {
        emit AdminChanged(_getAdmin(), newAdmin);
        _setAdmin(newAdmin);
    }

    /**
     * @dev The storage slot of the UpgradeableBeacon contract which defines the implementation for this proxy.
     * This is bytes32(uint256(keccak256('eip1967.proxy.beacon')) - 1)) and is validated in the constructor.
     */
    bytes32 internal constant _BEACON_SLOT = 0xa3f0ad74e5423aebfd80d3ef4346578335a9a72aeaee59ff6cb3582b35133d50;

    /**
     * @dev Returns the current beacon.
     */
    function _getBeacon() internal view returns (address) {
        return StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value;
    }

    /**
     * @dev Stores a new beacon in the EIP1967 beacon slot.
     */
    function _setBeacon(address newBeacon) private {
        require(AddressUpgradeable.isContract(newBeacon), "ERC1967: new beacon is not a contract");
        require(
            AddressUpgradeable.isContract(IBeaconUpgradeable(newBeacon).implementation()),
            "ERC1967: beacon implementation is not a contract"
        );
        StorageSlotUpgradeable.getAddressSlot(_BEACON_SLOT).value = newBeacon;
    }

    /**
     * @dev Perform beacon upgrade with additional setup call. Note: This upgrades the address of the beacon, it does
     * not upgrade the implementation contained in the beacon (see {UpgradeableBeacon-_setImplementation} for that).
     *
     * Emits a {BeaconUpgraded} event.
     */
    function _upgradeBeaconToAndCall(
        address newBeacon,
        bytes memory data,
        bool forceCall
    ) internal {
        _setBeacon(newBeacon);
        emit BeaconUpgraded(newBeacon);
        if (data.length > 0 || forceCall) {
            _functionDelegateCall(IBeaconUpgradeable(newBeacon).implementation(), data);
        }
    }

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-string-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function _functionDelegateCall(address target, bytes memory data) private returns (bytes memory) {
        require(AddressUpgradeable.isContract(target), "Address: delegate call to non-contract");

        // solhint-disable-next-line avoid-low-level-calls
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return AddressUpgradeable.verifyCallResult(success, returndata, "Address: low-level delegate call failed");
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
pragma solidity >=0.5.0 <0.9.0;

/**
 * @dev Interface of the ERC20 standard as defined in the EIP.
 */
interface IERC20 {
    /**
     * @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 `recipient`.
     *
     * Returns a boolean value indicating whether the operation succeeded.
     *
     * Emits a {Transfer} event.
     */
    function transfer(address recipient, 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 `sender` to `recipient` 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 sender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    /**
     * @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);
}

// 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 v4.6.0) (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 IERC721ReceiverUpgradeable {
    /**
     * @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 `IERC721Receiver.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/extensions/IERC721Metadata.sol)

pragma solidity ^0.8.0;

import "../IERC721Upgradeable.sol";

/**
 * @title ERC-721 Non-Fungible Token Standard, optional metadata extension
 * @dev See https://eips.ethereum.org/EIPS/eip-721
 */
interface IERC721MetadataUpgradeable is IERC721Upgradeable {
    /**
     * @dev Returns the token collection name.
     */
    function name() external view returns (string memory);

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

    /**
     * @dev Returns the Uniform Resource Identifier (URI) for `tokenId` token.
     */
    function tokenURI(uint256 tokenId) external view returns (string memory);
}

// 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 (last updated v4.8.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/MathUpgradeable.sol";

/**
 * @dev String operations.
 */
library StringsUpgradeable {
    bytes16 private constant _SYMBOLS = "0123456789abcdef";
    uint8 private constant _ADDRESS_LENGTH = 20;

    /**
     * @dev Converts a `uint256` to its ASCII `string` decimal representation.
     */
    function toString(uint256 value) internal pure returns (string memory) {
        unchecked {
            uint256 length = MathUpgradeable.log10(value) + 1;
            string memory buffer = new string(length);
            uint256 ptr;
            /// @solidity memory-safe-assembly
            assembly {
                ptr := add(buffer, add(32, length))
            }
            while (true) {
                ptr--;
                /// @solidity memory-safe-assembly
                assembly {
                    mstore8(ptr, byte(mod(value, 10), _SYMBOLS))
                }
                value /= 10;
                if (value == 0) break;
            }
            return buffer;
        }
    }

    /**
     * @dev Converts a `uint256` to its ASCII `string` hexadecimal representation.
     */
    function toHexString(uint256 value) internal pure returns (string memory) {
        unchecked {
            return toHexString(value, MathUpgradeable.log256(value) + 1);
        }
    }

    /**
     * @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] = _SYMBOLS[value & 0xf];
            value >>= 4;
        }
        require(value == 0, "Strings: hex length insufficient");
        return string(buffer);
    }

    /**
     * @dev Converts an `address` with fixed length of 20 bytes to its not checksummed ASCII `string` hexadecimal representation.
     */
    function toHexString(address addr) internal pure returns (string memory) {
        return toHexString(uint256(uint160(addr)), _ADDRESS_LENGTH);
    }
}

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

pragma solidity ^0.8.0;

import "./IERC165Upgradeable.sol";
import "../../proxy/utils/Initializable.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 ERC165Upgradeable is Initializable, IERC165Upgradeable {
    function __ERC165_init() internal onlyInitializing {
    }

    function __ERC165_init_unchained() internal onlyInitializing {
    }
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
        return interfaceId == type(IERC165Upgradeable).interfaceId;
    }

    /**
     * @dev This empty reserved space is put in place to allow future versions to add new
     * variables without shifting down storage in the inheritance chain.
     * See https://docs.openzeppelin.com/contracts/4.x/upgradeable#storage_gaps
     */
    uint256[50] private __gap;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (proxy/beacon/IBeacon.sol)

pragma solidity ^0.8.0;

/**
 * @dev This is the interface that {BeaconProxy} expects of its beacon.
 */
interface IBeaconUpgradeable {
    /**
     * @dev Must return an address that can be used as a delegate call target.
     *
     * {BeaconProxy} will check that this address is a contract.
     */
    function implementation() external view returns (address);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.8.3) (interfaces/IERC1967.sol)

pragma solidity ^0.8.0;

/**
 * @dev ERC-1967: Proxy Storage Slots. This interface contains the events defined in the ERC.
 *
 * _Available since v4.9._
 */
interface IERC1967Upgradeable {
    /**
     * @dev Emitted when the implementation is upgraded.
     */
    event Upgraded(address indexed implementation);

    /**
     * @dev Emitted when the admin account has changed.
     */
    event AdminChanged(address previousAdmin, address newAdmin);

    /**
     * @dev Emitted when the beacon is changed.
     */
    event BeaconUpgraded(address indexed beacon);
}

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

pragma solidity ^0.8.0;

/**
 * @dev Library for reading and writing primitive types to specific storage slots.
 *
 * Storage slots are often used to avoid storage conflict when dealing with upgradeable contracts.
 * This library helps with reading and writing to such slots without the need for inline assembly.
 *
 * The functions in this library return Slot structs that contain a `value` member that can be used to read or write.
 *
 * Example usage to set ERC1967 implementation slot:
 * ```
 * contract ERC1967 {
 *     bytes32 internal constant _IMPLEMENTATION_SLOT = 0x360894a13ba1a3210667c828492db98dca3e2076cc3735a920a3ca505d382bbc;
 *
 *     function _getImplementation() internal view returns (address) {
 *         return StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value;
 *     }
 *
 *     function _setImplementation(address newImplementation) internal {
 *         require(Address.isContract(newImplementation), "ERC1967: new implementation is not a contract");
 *         StorageSlot.getAddressSlot(_IMPLEMENTATION_SLOT).value = newImplementation;
 *     }
 * }
 * ```
 *
 * _Available since v4.1 for `address`, `bool`, `bytes32`, and `uint256`._
 */
library StorageSlotUpgradeable {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    /**
     * @dev Returns an `AddressSlot` with member `value` located at `slot`.
     */
    function getAddressSlot(bytes32 slot) internal pure returns (AddressSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `BooleanSlot` with member `value` located at `slot`.
     */
    function getBooleanSlot(bytes32 slot) internal pure returns (BooleanSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Bytes32Slot` with member `value` located at `slot`.
     */
    function getBytes32Slot(bytes32 slot) internal pure returns (Bytes32Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := slot
        }
    }

    /**
     * @dev Returns an `Uint256Slot` with member `value` located at `slot`.
     */
    function getUint256Slot(bytes32 slot) internal pure returns (Uint256Slot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.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 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);
        }
    }
}

{
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    "ds-test/=lib/forge-std/lib/ds-test/src/",
    "forge-std/=lib/forge-std/src/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "@ensdomains/=node_modules/@ensdomains/",
    "@eth-optimism/=node_modules/@eth-optimism/",
    "@openzeppelin/=node_modules/@openzeppelin/",
    "eth-gas-reporter/=node_modules/eth-gas-reporter/",
    "hardhat-deploy/=node_modules/hardhat-deploy/",
    "hardhat/=node_modules/hardhat/",
    "openzeppelin-solidity-2.3.0/=node_modules/openzeppelin-solidity-2.3.0/",
    "synthetix/=node_modules/synthetix/",
    "truffle/=node_modules/truffle/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 1000000
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MAX_DURATION","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"MINIMUM_EARLY_VESTING_FEE","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"acceptOwnership","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_account","type":"address"},{"internalType":"uint256","name":"_quantity","type":"uint256"}],"name":"appendVestingEntry","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"to","type":"address"},{"internalType":"uint256","name":"tokenId","type":"uint256"}],"name":"approve","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"owner","type":"address"}],"name":"balanceOf","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_from","type":"address"},{"internalType":"address","name":"_to","type":"address"},{"internalType":"uint256[]","name":"_entryIDs","type":"uint256[]"}],"name":"bulkTransferFrom","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"_beneficiary","type":"address"},{"internalType":"uint256","name":"_deposit","type":"uint256"},{"internalType":"uint256","name":"_duration","type":"uint256"},{"internalType":"uint256","name":"_earlyVestingFee","type":"uint256"}],"name":"createEscrowEntry","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"escrowMigrator","outputs":[{"internalType":"contract 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-----Decoded View---------------
Arg [0] : _kwenta (address): 0x920Cf626a271321C151D027030D5d08aF699456b
Arg [1] : _rewardsNotifier (address): 0xb176DaD2916db0905cd2D65ed54FDC3a878aFFe4

-----Encoded View---------------
2 Constructor Arguments found :
Arg [0] : 000000000000000000000000920cf626a271321c151d027030d5d08af699456b
Arg [1] : 000000000000000000000000b176dad2916db0905cd2d65ed54fdc3a878affe4