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// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import { Initializable } from "@openzeppelin/contracts/proxy/utils/Initializable.sol";
import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";

import { Airdrop } from "contracts/Airdrop.sol";
import { LiquidityOracle } from "contracts/LiquidityOracle.sol";

/// @custom:proxied
/// @title AirdropVesting
/// @notice Vesting contract for airdrop tokens that did not meet
///         the immediate distribution requirements of the Airdrop contract.
///         The contract is initialized with preset target balances for each
///         account that will have vested tokens. Tokens will vest in tranches
///         with accounts being able to claim vested tokens at the end of each
///         tranche. In order for all tokens to vest, the account must have
///         kept >=`VESTING_TARGET` percent of their target balance on Blast
///         during the tranche period. If this is not achieved, then the tokens
///         will vest proportionally. An oracle will report the account's liquidity
///         to the LiquidityOracle over time and will compute the average
///         liquidity during each tranche in order to determine if the target was met.
contract AirdropVesting is Initializable {
    struct Tranche {
        uint32 duration;
        uint16 rate;
    }

    uint256 internal constant BASIS_POINTS = 10_000;
    uint256 internal constant VESTING_TARGET = 10_000; // 100%

    ERC20 internal immutable BLAST_TOKEN;
    Airdrop internal immutable AIRDROP;
    LiquidityOracle internal immutable LIQUIDITY_ORACLE;

    uint256 public totalUnvested;
    Tranche[] public schedule;
    uint256 public vestingStartTime;

    mapping(address => uint256) public balances;
    mapping(address => uint256) public targetBalances;
    mapping(address => uint256) public lastClaimedTimestamp;
    mapping(address => address[]) public claimableAddresses;

    error Unauthorized();
    error InvalidSchedule();
    error ArrayLengthsDoNotMatch();
    error InvalidAddress();
    error TargetBalanceNotSet();
    error VestingHasNotBeenStarted();
    error BalanceAlreadySet();
    error ActionNotAvailable();

    /// @notice Only allows the airdrop contract to call a function.
    modifier onlyAirdrop() {
        if (msg.sender != address(AIRDROP)) {
            revert Unauthorized();
        }
        _;
    }

    /// @param _blastToken      Address of the Blast governance token.
    /// @param _airdrop         Address of the Airdrop contract.
    /// @param _liquidityOracle Address of the LiquidityOracle contract.
    constructor(ERC20 _blastToken, Airdrop _airdrop, LiquidityOracle _liquidityOracle) {
        if (
            address(_blastToken) == address(0) ||
            address(_airdrop) == address(0) ||
            address(_liquidityOracle) == address(0)
        ) {
            revert InvalidAddress();
        }

        BLAST_TOKEN = _blastToken;
        AIRDROP = _airdrop;
        LIQUIDITY_ORACLE = _liquidityOracle;

        _disableInitializers();
    }

    /// @notice Initializer.
    /// @param _schedule Vesting schedule.
    function initialize(Tranche[] calldata _schedule) external initializer {
        uint16 totalRate;
        uint256 scheduleLength = _schedule.length;
        for (uint256 i; i < scheduleLength; i++) {
            if (_schedule[i].duration == 0) {
                revert InvalidSchedule();
            }

            schedule.push(_schedule[i]);
            totalRate += _schedule[i].rate;
        }

        /// Schedule rates should sum to 100%.
        if (totalRate != BASIS_POINTS) {
            revert InvalidSchedule();
        }
    }

    /// @notice Set the target balances.
    /// @param accounts Array of account addresses.
    /// @param amounts  Array of target balances.
    function setTargetBalances(address[] calldata accounts, uint256[] calldata amounts) external {
        if (msg.sender != AIRDROP.owner()) {
            revert Unauthorized();
        }

        uint256 accountsLength = accounts.length;
        if (accountsLength != amounts.length) {
            revert ArrayLengthsDoNotMatch();
        }
        for (uint256 i; i < accountsLength; i++) {
            targetBalances[accounts[i]] = amounts[i];
        }
    }

    /// @notice Begin the vesting schedule and unlock deposits.
    function startVesting() external onlyAirdrop {
        if (vestingStartTime != 0) {
            revert ActionNotAvailable();
        }
        vestingStartTime = block.timestamp;
    }

    /// @notice Recover unvested tokens after the contract has expired.
    /// @param recipient Address to receive the recovered tokens.
    function recover(address recipient) external onlyAirdrop {
        if (recipient == address(0)) {
            revert InvalidAddress();
        }

        uint256 amount = totalUnvested;
        totalUnvested = 0;
        if (amount != 0) {
            BLAST_TOKEN.transfer(recipient, amount);
        }
    }

    /// @notice Vest airdrop tokens on behalf of an account. Only callable by the Airdrop contract.
    /// @param initialRecipient   Address of the initial airdrop recipient.
    /// @param delegatedRecipient Address of the initial airdrop recipient.
    /// @param amount           Amount of tokens to vest.
    function deposit(address initialRecipient, address delegatedRecipient, uint256 amount) external onlyAirdrop {
        if (vestingStartTime == 0) {
            revert VestingHasNotBeenStarted();
        }

        if (targetBalances[initialRecipient] == 0) {
            revert TargetBalanceNotSet();
        }

        /// Add the initial recipient as claimable for the delegated recipient.
        claimableAddresses[delegatedRecipient].push(initialRecipient);

        /// Record the deposit under the initial recipient address.
        if (balances[initialRecipient] != 0) {
            revert BalanceAlreadySet();
        }
        balances[initialRecipient] = amount;

        /// Transfer airdrop tokens from the Airdrop contract to this.
        BLAST_TOKEN.transferFrom(address(AIRDROP), address(this), amount);
    }

    /// @notice Claim vested tokens.
    function claim() external returns (uint256, uint256) {
        return claim(msg.sender);
    }

    /// @notice Claim vested tokens.
    /// @param recipient Address of the token recipient.
    function claim(address recipient) public returns (uint256 vestedAmount, uint256 unvestedAmount) {
        if (recipient == address(0)) {
            revert InvalidAddress();
        }

        /// Load the vesting schedule into memory.
        Tranche[] memory _schedule = schedule;

        /// Get the array of claimable addresses for the account.
        address[] storage _claimableAddresses = claimableAddresses[msg.sender];

        uint256 claimableAddressesLength = _claimableAddresses.length;
        for (uint256 i; i < claimableAddressesLength; i++) {
            address initialRecipient = _claimableAddresses[i];

            (uint256 _vestedAmount, uint256 _unvestedAmount) = _computeVestedAmount(initialRecipient, _schedule);
            vestedAmount += _vestedAmount;
            unvestedAmount += _unvestedAmount;

            /// Update the last claim timestamp for the initial recipient.
            lastClaimedTimestamp[initialRecipient] = block.timestamp;
        }

        /// Update total unvested tokens.
        totalUnvested += unvestedAmount;

        /// Distribute the vested tokens to the account.
        if (vestedAmount > 0) {
            BLAST_TOKEN.transfer(recipient, vestedAmount);
        }
    }

    /// @notice Compute the claimable balance of the account.
    /// @param account Address of the account.
    /// @return vestedAmount
    function claimableBalance(address account) external view returns (uint256 vestedAmount) {
        /// Load the vesting schedule into memory.
        Tranche[] memory _schedule = schedule;

        /// Get the array of claimable addresses for the account.
        address[] storage _claimableAddresses = claimableAddresses[account];

        uint256 claimableAddressesLength = _claimableAddresses.length;
        for (uint256 i; i < claimableAddressesLength; i++) {
            (uint256 _vestedAmount,) = _computeVestedAmount(_claimableAddresses[i], _schedule);
            vestedAmount += _vestedAmount;
        }
    }

    /// @notice Getter for the Blast token address.
    function blastToken() external view returns (address) {
        return address(BLAST_TOKEN);
    }

    /// @notice Getter for the vesting target.
    function vestingTarget() external pure returns (uint256) {
        return VESTING_TARGET;
    }

    /// @notice Getter for the Airdrop address.
    function airdrop() external view returns (address) {
        return address(AIRDROP);
    }

    /// @notice Getter for the LiquidityOracle address.
    function liquidityOracle() external view returns (address) {
        return address(LIQUIDITY_ORACLE);
    }

    /// @notice Compute the vested amount for an initial recipient address.
    /// @param initialRecipient Address of the initial airdrop recipient.
    /// @param _schedule        Vesting schedule taken from the storage variable `schedule`.
    /// @return vestedAmount Amount of tokens vested and unclaimed, unvestedAmount Amount of tokens that did not vest.
    function _computeVestedAmount(
        address initialRecipient,
        Tranche[] memory _schedule
    )
        internal
        view
        returns (uint256 vestedAmount, uint256 unvestedAmount)
    {
        uint256 targetBalance = targetBalances[initialRecipient];
        if (targetBalance == 0) {
            revert TargetBalanceNotSet();
        }

        uint256 previousTrancheEndTime = vestingStartTime;
        uint256 _lastClaimedTimestamp = lastClaimedTimestamp[initialRecipient];
        uint256 scheduleLength = _schedule.length;
        for (uint256 i; i < scheduleLength; i++) {
            Tranche memory tranche = _schedule[i];

            /// Skip if the account has already claimed for this tranche.
            uint256 trancheEndTime = previousTrancheEndTime + tranche.duration;
            if (_lastClaimedTimestamp < trancheEndTime && block.timestamp >= trancheEndTime) {
                /// Compute the vested amount for this tranche.
                uint256 vestedRate =
                    _computeVestedRate(initialRecipient, targetBalance, previousTrancheEndTime, trancheEndTime);

                /// Compute amount available to vest in current tranche.
                uint256 trancheAmount = (tranche.rate * balances[initialRecipient]) / BASIS_POINTS;

                /// Compute the amount vested in the current tranche.
                uint256 vestedTrancheAmount = (vestedRate * trancheAmount) / BASIS_POINTS;

                vestedAmount += vestedTrancheAmount;
                unvestedAmount += trancheAmount - vestedTrancheAmount;
            }

            previousTrancheEndTime = trancheEndTime;
        }
    }

    /// @notice Compute the vested rate for the account between a specified time period based on
    /// the reported L2 liquidity compared to the initial target. The L2 liquidity is computed
    /// by averaging liquidity reports from the LiquidityOracle.
    /// @param account       Address of the account.
    /// @param startTime     Start time.
    /// @param endTime       End time.
    /// @param targetBalance Account's target balance.
    /// @return Vested rate.
    function _computeVestedRate(
        address account,
        uint256 targetBalance,
        uint256 startTime,
        uint256 endTime
    )
        internal
        view
        returns (uint256)
    {
        /// Query the average balance between the start and end time from the LiquidityOracle.
        uint256 averageBalance = LIQUIDITY_ORACLE.averageBalance(account, startTime, endTime);
        uint256 cappedAverageBalance = averageBalance < targetBalance ? averageBalance : targetBalance;

        /// Compute the liquidity rate compared to the account's target balance.
        uint256 liquidityRate = (cappedAverageBalance * BASIS_POINTS) / targetBalance;

        if (liquidityRate >= VESTING_TARGET) {
            /// If the liquidity rate achieves the vesting target, then the account vests 100%.
            return BASIS_POINTS;
        } else {
            /// Otherwise, the account vests proportionally.
            return (liquidityRate * BASIS_POINTS) / VESTING_TARGET;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (proxy/utils/Initializable.sol)

pragma solidity ^0.8.2;

import "../../utils/Address.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]
 * ```solidity
 * 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) || (!Address.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 v4.9.0) (token/ERC20/ERC20.sol)

pragma solidity ^0.8.0;

import "./IERC20.sol";
import "./extensions/IERC20Metadata.sol";
import "../../utils/Context.sol";

/**
 * @dev Implementation of the {IERC20} interface.
 *
 * This implementation is agnostic to the way tokens are created. This means
 * that a supply mechanism has to be added in a derived contract using {_mint}.
 * For a generic mechanism see {ERC20PresetMinterPauser}.
 *
 * TIP: For a detailed writeup see our guide
 * https://forum.openzeppelin.com/t/how-to-implement-erc20-supply-mechanisms/226[How
 * to implement supply mechanisms].
 *
 * The default value of {decimals} is 18. To change this, you should override
 * this function so it returns a different value.
 *
 * We have followed general OpenZeppelin Contracts guidelines: functions revert
 * instead returning `false` on failure. This behavior is nonetheless
 * conventional and does not conflict with the expectations of ERC20
 * applications.
 *
 * Additionally, an {Approval} event is emitted on calls to {transferFrom}.
 * This allows applications to reconstruct the allowance for all accounts just
 * by listening to said events. Other implementations of the EIP may not emit
 * these events, as it isn't required by the specification.
 *
 * Finally, the non-standard {decreaseAllowance} and {increaseAllowance}
 * functions have been added to mitigate the well-known issues around setting
 * allowances. See {IERC20-approve}.
 */
contract ERC20 is Context, IERC20, IERC20Metadata {
    mapping(address => uint256) private _balances;

    mapping(address => mapping(address => uint256)) private _allowances;

    uint256 private _totalSupply;

    string private _name;
    string private _symbol;

    /**
     * @dev Sets the values for {name} and {symbol}.
     *
     * All two of these values are immutable: they can only be set once during
     * construction.
     */
    constructor(string memory name_, string memory symbol_) {
        _name = name_;
        _symbol = symbol_;
    }

    /**
     * @dev Returns the name of the token.
     */
    function name() public view virtual override returns (string memory) {
        return _name;
    }

    /**
     * @dev Returns the symbol of the token, usually a shorter version of the
     * name.
     */
    function symbol() public view virtual override returns (string memory) {
        return _symbol;
    }

    /**
     * @dev Returns the number of decimals used to get its user representation.
     * For example, if `decimals` equals `2`, a balance of `505` tokens should
     * be displayed to a user as `5.05` (`505 / 10 ** 2`).
     *
     * Tokens usually opt for a value of 18, imitating the relationship between
     * Ether and Wei. This is the default value returned by this function, unless
     * it's overridden.
     *
     * NOTE: This information is only used for _display_ purposes: it in
     * no way affects any of the arithmetic of the contract, including
     * {IERC20-balanceOf} and {IERC20-transfer}.
     */
    function decimals() public view virtual override returns (uint8) {
        return 18;
    }

    /**
     * @dev See {IERC20-totalSupply}.
     */
    function totalSupply() public view virtual override returns (uint256) {
        return _totalSupply;
    }

    /**
     * @dev See {IERC20-balanceOf}.
     */
    function balanceOf(address account) public view virtual override returns (uint256) {
        return _balances[account];
    }

    /**
     * @dev See {IERC20-transfer}.
     *
     * Requirements:
     *
     * - `to` cannot be the zero address.
     * - the caller must have a balance of at least `amount`.
     */
    function transfer(address to, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _transfer(owner, to, amount);
        return true;
    }

    /**
     * @dev See {IERC20-allowance}.
     */
    function allowance(address owner, address spender) public view virtual override returns (uint256) {
        return _allowances[owner][spender];
    }

    /**
     * @dev See {IERC20-approve}.
     *
     * NOTE: If `amount` is the maximum `uint256`, the allowance is not updated on
     * `transferFrom`. This is semantically equivalent to an infinite approval.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function approve(address spender, uint256 amount) public virtual override returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, amount);
        return true;
    }

    /**
     * @dev See {IERC20-transferFrom}.
     *
     * Emits an {Approval} event indicating the updated allowance. This is not
     * required by the EIP. See the note at the beginning of {ERC20}.
     *
     * NOTE: Does not update the allowance if the current allowance
     * is the maximum `uint256`.
     *
     * Requirements:
     *
     * - `from` and `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     * - the caller must have allowance for ``from``'s tokens of at least
     * `amount`.
     */
    function transferFrom(address from, address to, uint256 amount) public virtual override returns (bool) {
        address spender = _msgSender();
        _spendAllowance(from, spender, amount);
        _transfer(from, to, amount);
        return true;
    }

    /**
     * @dev Atomically increases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     */
    function increaseAllowance(address spender, uint256 addedValue) public virtual returns (bool) {
        address owner = _msgSender();
        _approve(owner, spender, allowance(owner, spender) + addedValue);
        return true;
    }

    /**
     * @dev Atomically decreases the allowance granted to `spender` by the caller.
     *
     * This is an alternative to {approve} that can be used as a mitigation for
     * problems described in {IERC20-approve}.
     *
     * Emits an {Approval} event indicating the updated allowance.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `spender` must have allowance for the caller of at least
     * `subtractedValue`.
     */
    function decreaseAllowance(address spender, uint256 subtractedValue) public virtual returns (bool) {
        address owner = _msgSender();
        uint256 currentAllowance = allowance(owner, spender);
        require(currentAllowance >= subtractedValue, "ERC20: decreased allowance below zero");
        unchecked {
            _approve(owner, spender, currentAllowance - subtractedValue);
        }

        return true;
    }

    /**
     * @dev Moves `amount` of tokens from `from` to `to`.
     *
     * This internal function is equivalent to {transfer}, and can be used to
     * e.g. implement automatic token fees, slashing mechanisms, etc.
     *
     * Emits a {Transfer} event.
     *
     * Requirements:
     *
     * - `from` cannot be the zero address.
     * - `to` cannot be the zero address.
     * - `from` must have a balance of at least `amount`.
     */
    function _transfer(address from, address to, uint256 amount) internal virtual {
        require(from != address(0), "ERC20: transfer from the zero address");
        require(to != address(0), "ERC20: transfer to the zero address");

        _beforeTokenTransfer(from, to, amount);

        uint256 fromBalance = _balances[from];
        require(fromBalance >= amount, "ERC20: transfer amount exceeds balance");
        unchecked {
            _balances[from] = fromBalance - amount;
            // Overflow not possible: the sum of all balances is capped by totalSupply, and the sum is preserved by
            // decrementing then incrementing.
            _balances[to] += amount;
        }

        emit Transfer(from, to, amount);

        _afterTokenTransfer(from, to, amount);
    }

    /** @dev Creates `amount` tokens and assigns them to `account`, increasing
     * the total supply.
     *
     * Emits a {Transfer} event with `from` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     */
    function _mint(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: mint to the zero address");

        _beforeTokenTransfer(address(0), account, amount);

        _totalSupply += amount;
        unchecked {
            // Overflow not possible: balance + amount is at most totalSupply + amount, which is checked above.
            _balances[account] += amount;
        }
        emit Transfer(address(0), account, amount);

        _afterTokenTransfer(address(0), account, amount);
    }

    /**
     * @dev Destroys `amount` tokens from `account`, reducing the
     * total supply.
     *
     * Emits a {Transfer} event with `to` set to the zero address.
     *
     * Requirements:
     *
     * - `account` cannot be the zero address.
     * - `account` must have at least `amount` tokens.
     */
    function _burn(address account, uint256 amount) internal virtual {
        require(account != address(0), "ERC20: burn from the zero address");

        _beforeTokenTransfer(account, address(0), amount);

        uint256 accountBalance = _balances[account];
        require(accountBalance >= amount, "ERC20: burn amount exceeds balance");
        unchecked {
            _balances[account] = accountBalance - amount;
            // Overflow not possible: amount <= accountBalance <= totalSupply.
            _totalSupply -= amount;
        }

        emit Transfer(account, address(0), amount);

        _afterTokenTransfer(account, address(0), amount);
    }

    /**
     * @dev Sets `amount` as the allowance of `spender` over the `owner` s tokens.
     *
     * This internal function is equivalent to `approve`, and can be used to
     * e.g. set automatic allowances for certain subsystems, etc.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `owner` cannot be the zero address.
     * - `spender` cannot be the zero address.
     */
    function _approve(address owner, address spender, uint256 amount) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");

        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, amount);
    }

    /**
     * @dev Updates `owner` s allowance for `spender` based on spent `amount`.
     *
     * Does not update the allowance amount in case of infinite allowance.
     * Revert if not enough allowance is available.
     *
     * Might emit an {Approval} event.
     */
    function _spendAllowance(address owner, address spender, uint256 amount) internal virtual {
        uint256 currentAllowance = allowance(owner, spender);
        if (currentAllowance != type(uint256).max) {
            require(currentAllowance >= amount, "ERC20: insufficient allowance");
            unchecked {
                _approve(owner, spender, currentAllowance - amount);
            }
        }
    }

    /**
     * @dev Hook that is called before any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * will be transferred to `to`.
     * - when `from` is zero, `amount` tokens will be minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens will be burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _beforeTokenTransfer(address from, address to, uint256 amount) internal virtual {}

    /**
     * @dev Hook that is called after any transfer of tokens. This includes
     * minting and burning.
     *
     * Calling conditions:
     *
     * - when `from` and `to` are both non-zero, `amount` of ``from``'s tokens
     * has been transferred to `to`.
     * - when `from` is zero, `amount` tokens have been minted for `to`.
     * - when `to` is zero, `amount` of ``from``'s tokens have been burned.
     * - `from` and `to` are never both zero.
     *
     * To learn more about hooks, head to xref:ROOT:extending-contracts.adoc#using-hooks[Using Hooks].
     */
    function _afterTokenTransfer(address from, address to, uint256 amount) internal virtual {}
}

// SPDX-License-Identifier: MIT
pragma solidity 0.8.24;

import { Ownable2Step } from "@openzeppelin/contracts/access/Ownable2Step.sol";
import { IERC1271 } from "@openzeppelin/contracts/interfaces/IERC1271.sol";
import { EIP712 } from "@openzeppelin/contracts/utils/cryptography/EIP712.sol";
import { ECDSA } from "@openzeppelin/contracts/utils/cryptography/ECDSA.sol";
import { ERC20 } from "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import { MerkleProofLib } from "solmate/utils/MerkleProofLib.sol";

import { AirdropVesting } from "contracts/AirdropVesting.sol";

/// @custom:ownable
/// @title Airdrop
/// @notice Airdrop contract to distribute Blast tokens to accounts using
///         a Merkle proof to verify inclusion in the airdrop. Users can delegate
///         their airdrop to another address and allow that address to collect
///         on their behalf. Upon claiming, tokens up to the `vestingThreshold`
///         are immediately distirbuted to the account. Above the threshold, only
///         `vestingRate` percent of tokens are distributed and the remaining
///         are deposited into the AirdropVesting contract where the tokens will
///         vest over time dependant on their L2 liquidity.
contract Airdrop is Ownable2Step, EIP712 {
    struct Claim {
        address initialRecipient;
        uint256 amount;
        uint64 nonce;
        bytes32[] proof;
        bytes32 merkleRoot;
    }

    struct ClaimDelegated {
        address initialRecipient;
        uint256 amount;
        uint64 nonce;
        bytes32[] proof;
        bytes32 merkleRoot;
        uint32 expirationTimestamp;
        bytes delegationSignature;
    }

    uint256 internal constant BASIS_POINTS = 10_000; // bips
    uint256 internal constant EXPIRATION_DELAY = 30 days;

    ERC20 internal immutable BLAST_TOKEN;
    address internal immutable FUNDER;
    bytes32 internal immutable DELEGATION_TYPEHASH;

    AirdropVesting public airdropVesting;
    uint256 public expirationTime;
    uint256 public vestingThreshold;
    uint256 public vestingRate;

    mapping(address => bool) public claimed;
    mapping(bytes32 => bool) public approvedMerkleRoots;
    mapping(address => bool) public approvedClaimers;

    event AirdropClaimed(address initialRecipient, address delegatedRecipient, uint256 amount);

    error Unauthorized();
    error InvalidAddress();
    error InvalidProof();
    error InvalidMerkleRoot();
    error AddressAlreadySet();
    error AirdropAlreadyClaimed();
    error ActionNotAvailable();
    error SignatureExpired();
    error InvalidSignature();
    error ArrayLengthsDoNotMatch();
    error InvalidRate();

    /// @param _blastToken Address of the Blast token.
    /// @param _funder     Address of the airdrop funder.
    constructor(ERC20 _blastToken, address _funder) EIP712("Blast Airdrop", "1.0") {
        if (address(_blastToken) == address(0) || _funder == address(0)) {
            revert InvalidAddress();
        }

        BLAST_TOKEN = _blastToken;
        FUNDER = _funder;
        DELEGATION_TYPEHASH =
            keccak256("Delegation(address initialRecipient,address delegatedRecipient,uint32 expirationTimestamp)");
    }

    /// @notice Set the AirdropVesting contract. Can only be called once by the owner.
    /// @param _airdropVesting Address of the AirdropVesting contract.
    function setAirdropVesting(AirdropVesting _airdropVesting) external onlyOwner {
        if (address(_airdropVesting) == address(0)) {
            revert InvalidAddress();
        }

        if (address(airdropVesting) != address(0)) {
            revert AddressAlreadySet();
        }

        airdropVesting = _airdropVesting;
    }

    /// @notice Set the vesting parameters. Can only be called by the owner.
    /// @param _vestingThreshold Vesting threshold.
    /// @param _vestingRate      Vesting rate.
    function setVestingParameters(uint256 _vestingThreshold, uint256 _vestingRate) external onlyOwner {
        if (expirationTime != 0) {
            revert ActionNotAvailable();
        }

        if (_vestingRate > BASIS_POINTS) {
            revert InvalidRate();
        }

        vestingThreshold = _vestingThreshold;
        vestingRate = _vestingRate;
    }

    /// @notice Set the approvals for the merkle roots of the airdrop trees. The roots can be set at any point once the
    /// AirdropVesting
    /// contract is set. The roots can be updated during the claiming period if necessary.
    /// @param merkleRoots Airdrop merkle tree roots.
    /// @param approvals   If the root is approved.
    function setMerkleRoots(bytes32[] calldata merkleRoots, bool[] calldata approvals) external onlyOwner {
        if (address(airdropVesting) == address(0)) {
            revert ActionNotAvailable();
        }

        uint256 merkleRootsLength = merkleRoots.length;
        if (merkleRootsLength != approvals.length) {
            revert ArrayLengthsDoNotMatch();
        }

        for (uint256 i; i < merkleRootsLength; i++) {
            approvedMerkleRoots[merkleRoots[i]] = approvals[i];
        }
    }

    /// @notice Set the approval of claimer addresses.
    /// @param claimers  Array of claimer addresses.
    /// @param approvals Array of whether the adjacent address should be approved.
    function setClaimers(address[] memory claimers, bool[] memory approvals) external onlyOwner {
        uint256 claimersLength = claimers.length;
        if (claimersLength != approvals.length) {
            revert ArrayLengthsDoNotMatch();
        }

        for (uint256 i; i < claimersLength; i++) {
            approvedClaimers[claimers[i]] = approvals[i];
        }
    }

    /// @notice Fund the contract with Blast tokens to airdrop. Can only be called by the FUNDER.
    /// Can be called multiple times before claiming is opened. If too many
    /// tokens were sent, they can be withdrawn using the `recover` method.
    /// @param amount Total airdrop amount to transfer in the form of Blast tokens.
    function fund(uint256 amount) external {
        if (msg.sender != FUNDER) {
            revert Unauthorized();
        }

        if (expirationTime != 0) {
            revert ActionNotAvailable();
        }

        BLAST_TOKEN.transferFrom(FUNDER, address(this), amount);
    }

    /// @notice Open the claiming period and begin the AirdropVesting contract.
    /// Can only be called by the owner once the contract is funded and will disable the
    /// `fund` method.
    function open() external onlyOwner {
        if (expirationTime != 0 || BLAST_TOKEN.balanceOf(address(this)) == 0 || address(airdropVesting) == address(0)) {
            revert ActionNotAvailable();
        }

        /// Set the expiration time and open claiming.
        expirationTime = block.timestamp + EXPIRATION_DELAY;

        /// Approve the AirdropVesting contract.
        BLAST_TOKEN.approve(address(airdropVesting), BLAST_TOKEN.balanceOf(address(this)));

        /// Begin the vesting contract as well.
        airdropVesting.startVesting();
    }

    /// @notice Claim airdrops. Only approved claimers can call.
    /// @param claims Array of airdrop claims.
    function claim(Claim[] calldata claims) external {
        if (expirationTime == 0) {
            revert ActionNotAvailable();
        }

        if (!approvedClaimers[msg.sender]) {
            revert Unauthorized();
        }

        uint256 claimsLength = claims.length;
        for (uint256 i; i < claimsLength; i++) {
            Claim calldata airdropClaim = claims[i];

            address initialRecipient = airdropClaim.initialRecipient;

            /// Claim the airdrop, distributing vested tokens to the AirdropVesting contract.
            uint256 distributedAmount = _claim(
                initialRecipient,
                initialRecipient,
                airdropClaim.amount,
                airdropClaim.nonce,
                airdropClaim.proof,
                airdropClaim.merkleRoot
            );

            /// Send the immediately distributed tokens to the recipient.
            if (distributedAmount > 0) {
                BLAST_TOKEN.transfer(initialRecipient, distributedAmount);
            }
        }
    }

    /// @notice Claim delegated airdrops. Only approved claimers can call.
    /// @param delegatedRecipients Array of delegated recipients.
    /// @param claims              Nested array of airdrop claims grouped by the delegated recipient.
    function claimDelegated(address[] calldata delegatedRecipients, ClaimDelegated[][] calldata claims) external {
        if (expirationTime == 0) {
            revert ActionNotAvailable();
        }

        if (!approvedClaimers[msg.sender]) {
            revert Unauthorized();
        }

        uint256 recipientsLength = delegatedRecipients.length;
        if (recipientsLength != claims.length) {
            revert ArrayLengthsDoNotMatch();
        }

        /// For each delegated recipient.
        for (uint256 i; i < recipientsLength; i++) {
            address delegatedRecipient = delegatedRecipients[i];
            if (delegatedRecipient == address(0)) {
                revert InvalidAddress();
            }

            uint256 distributedAmount;

            /// For each claim delegated to the current recipient.
            uint256 claimsLength = claims[i].length;
            for (uint256 j; j < claimsLength; j++) {
                ClaimDelegated calldata airdropClaim = claims[i][j];

                address initialRecipient = airdropClaim.initialRecipient;

                /// If the delegated recipient is set as different than the initial recipient.
                if (initialRecipient != delegatedRecipient) {
                    /// Verify the delegation signature.
                    verifyDelegation(
                        initialRecipient,
                        delegatedRecipient,
                        airdropClaim.expirationTimestamp,
                        airdropClaim.delegationSignature
                    );
                }

                /// Claim the airdrop, distributing vested tokens to the AirdropVesting contract and tracking
                /// tokens to be immediately distributed.
                distributedAmount += _claim(
                    initialRecipient,
                    delegatedRecipient,
                    airdropClaim.amount,
                    airdropClaim.nonce,
                    airdropClaim.proof,
                    airdropClaim.merkleRoot
                );
            }

            /// Send the immediately distributed tokens to the delegated recipient.
            if (distributedAmount > 0) {
                BLAST_TOKEN.transfer(delegatedRecipient, distributedAmount);
            }
        }
    }

    /// @notice Recover unclaimed airdrop tokens after the contract has expired.
    /// @param recipient Address to receive the recovered funds.
    /// @param amount    Amount of tokens to recover.
    function recover(address recipient, uint256 amount) external onlyOwner {
        /// Note: this allows tokens to be recovered before the expirationTime is set in the `open` call.
        if (block.timestamp < expirationTime) {
            revert ActionNotAvailable();
        }

        if (recipient == address(0)) {
            revert InvalidAddress();
        }

        /// Recover unvested tokens from the airdrop vesting contract.
        airdropVesting.recover(recipient);

        /// Transfer unclaimed tokens to the recipient.
        BLAST_TOKEN.transfer(recipient, amount);
    }

    /// @notice Verify delegated recipient signature.
    /// @param signer              Address of the expected signer.
    /// @param delegatedRecipient  Address of the delegated recipient.
    /// @param expirationTimestamp Expiration timestamp of the signature.
    /// @param signature           Packed signature.
    function verifyDelegation(
        address signer,
        address delegatedRecipient,
        uint32 expirationTimestamp,
        bytes calldata signature
    )
        public
        view
    {
        if (block.timestamp > expirationTimestamp) {
            revert SignatureExpired();
        }

        bytes32 digest = hashDelegation(signer, delegatedRecipient, expirationTimestamp);

        if (signer.code.length > 0) {
            /// If the signer is a contract, verify the EIP1271 signature.
            bytes4 result = IERC1271(signer).isValidSignature(digest, signature);
            if (result != IERC1271.isValidSignature.selector) {
                revert InvalidSignature();
            }
        } else {
            address recoveredSigner = ECDSA.recover(digest, signature);
            if (recoveredSigner != signer) {
                revert InvalidSignature();
            }
        }
    }

    /// @notice Get the delegation signature digest.
    /// @param initialRecipient    Address of the initial recipient.
    /// @param delegatedRecipient  Address of the delegated recipient.
    /// @param expirationTimestamp Expiration timestamp of the signature.
    function hashDelegation(
        address initialRecipient,
        address delegatedRecipient,
        uint32 expirationTimestamp
    )
        public
        view
        returns (bytes32)
    {
        return _hashTypedDataV4(
            keccak256(abi.encode(DELEGATION_TYPEHASH, initialRecipient, delegatedRecipient, expirationTimestamp))
        );
    }

    /// @notice Getter for the Blast token address.
    function blastToken() external view returns (address) {
        return address(BLAST_TOKEN);
    }

    /// @notice Getter for the airdrop funder.
    function funder() external view returns (address) {
        return FUNDER;
    }

    /// @notice Getter for the airdrop expiration delay.
    function expirationDelay() external pure returns (uint256) {
        return EXPIRATION_DELAY;
    }

    /// @notice Verify and claim the airdrop.
    /// @dev Will deposit vesting tokens to AirdropVesting contr but does not distribute remaining tokens to the user.
    /// @param initialRecipient   Address of the initial airdrop recipient.
    /// @param delegatedRecipient Address of the delegated airdrop recipient.
    /// @param amount             Airdrop amount.
    /// @param proof              Airdrop proof.
    /// @param merkleRoot         Airdrop merkle root.
    function _claim(
        address initialRecipient,
        address delegatedRecipient,
        uint256 amount,
        uint64 nonce,
        bytes32[] calldata proof,
        bytes32 merkleRoot
    )
        internal
        returns (uint256 distributedAmount)
    {
        /// Revert if the account has already claimed.
        if (claimed[initialRecipient]) {
            revert AirdropAlreadyClaimed();
        }
        claimed[initialRecipient] = true;

        if (!approvedMerkleRoots[merkleRoot]) {
            revert InvalidMerkleRoot();
        }

        /// Verify the merkle proof of the input airdrop parameters for the caller.
        bool validProof = MerkleProofLib.verify(proof, merkleRoot, _computeLeaf(initialRecipient, amount, nonce));
        if (!validProof) {
            revert InvalidProof();
        }

        if (amount > vestingThreshold) {
            /// If the account is a whale, vest portion of their allocation and distribute the other portion to the
            /// account.

            /// (A - VT) * (VR)
            uint256 vestedAmount = ((amount - vestingThreshold) * vestingRate) / BASIS_POINTS;

            /// VT + (A - VT) * (1 - VR) = A - (A - VT)*VR
            distributedAmount = amount - vestedAmount;

            airdropVesting.deposit(initialRecipient, delegatedRecipient, vestedAmount);
        } else {
            /// Otherwise, distribute the entire allocation to the account.
            distributedAmount = amount;
        }

        emit AirdropClaimed(initialRecipient, delegatedRecipient, amount);
    }

    /// @notice Compute merkle tree leaf.
    /// @param account Address of airdrop recipient.
    /// @param amount  Amount of airdrop allocation.
    /// @param nonce   Leaf nonce.
    /// @return Merkle tree leaf.
    function _computeLeaf(address account, uint256 amount, uint64 nonce) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked(account, amount, nonce));
    }
}

pragma solidity 0.8.24;

import { Ownable2Step } from "@openzeppelin/contracts/access/Ownable2Step.sol";

/// @custom:ownable
/// @title LiquidityOracle
/// @notice Reporting contract to record the L2 liquidity of targeted accounts and
/// compute rolling averages of the liquidity amounts.
contract LiquidityOracle is Ownable2Step {
    address public oracle;

    mapping(address => uint256[]) public reports;
    mapping(address => uint256[]) public reportTimestamps;

    error Unauthorized();
    error InvalidReportIndex();
    error ArrayLengthsDoNotMatch();
    error InvalidTimePeriod();
    error InvalidTimestamp();

    /// @notice Set new oracle address.
    /// @param _oracle Oracle address.
    function setOracle(address _oracle) external onlyOwner {
        oracle = _oracle;
    }

    /// @notice Create a new report timestamp and report account balances.
    /// @param accounts  Array of account addresses.
    /// @param amounts   Array of account balances.
    /// @param timestamp Timestamp of the report.
    function report(address[] calldata accounts, uint256[] calldata amounts, uint256 timestamp) external {
        if (msg.sender != oracle) {
            revert Unauthorized();
        }

        uint256 accountsLength = accounts.length;
        if (accountsLength != amounts.length) {
            revert ArrayLengthsDoNotMatch();
        }

        for (uint256 i; i < accountsLength; i++) {
            address account = accounts[i];

            uint256 reportsLength = reports[account].length;
            if (reportsLength != 0 && reportTimestamps[account][reportsLength - 1] >= timestamp) {
                revert InvalidTimestamp();
            }

            reportTimestamps[account].push(timestamp);
            reports[account].push(amounts[i]);
        }
    }

    /// @notice Report account balances at an previous report index.
    /// @param accounts       Array of account addresses.
    /// @param amounts       Array of account balances.
    /// @param reportIndexes Array of report indexes to overwrite.
    function overwriteReport(
        address[] calldata accounts,
        uint256[] calldata amounts,
        uint256[] calldata reportIndexes
    )
        public
    {
        if (msg.sender != oracle) {
            revert Unauthorized();
        }

        uint256 accountsLength = accounts.length;
        if (accountsLength != amounts.length || accountsLength != reportIndexes.length) {
            revert ArrayLengthsDoNotMatch();
        }

        /// Overwrite the recorded balances for each account at the given report index.
        for (uint256 i; i < accountsLength; i++) {
            address account = accounts[i];
            uint256 reportIndex = reportIndexes[i];

            /// Check if the report index exists.
            if (reportIndex >= reportTimestamps[account].length) {
                revert InvalidReportIndex();
            }

            reports[account][reportIndex] = amounts[i];
        }
    }

    /// @notice Compute the time-weighted average balance of the account between a start and end time.
    /// @param account   Address of the account.
    /// @param startTime Beginning of the time period to average.
    /// @param endTime   End of the time period to average.
    /// @return Average balance during the timespan.
    function averageBalance(address account, uint256 startTime, uint256 endTime) external view returns (uint256) {
        uint256 accountReportsLength = reportTimestamps[account].length;
        if (
            endTime <= startTime ||
            accountReportsLength == 0 ||
            reportTimestamps[account][accountReportsLength - 1] <= startTime
        ) {
            revert InvalidTimePeriod();
        }

        uint256 weightedSum;
        uint256 previousTimestamp = startTime;
        for (uint256 i; i < accountReportsLength; i++) {
            uint256 reportTimestamp = reportTimestamps[account][i];
            uint256 liquidity = reports[account][i];

            if (reportTimestamp >= endTime) {
                /// If the report is outside of the time-window, then record the liquidity up to the end time.
                weightedSum += (endTime - previousTimestamp) * liquidity;

                previousTimestamp = endTime;

                /// Break the loop.
                break;
            } else if (reportTimestamp > startTime) {
                /// If the report is in the time-window, then record the liquidity starting from the previous report.
                weightedSum += (reportTimestamp - previousTimestamp) * liquidity;

                previousTimestamp = reportTimestamp;
            }
        }

        return weightedSum / (previousTimestamp - startTime);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Address.sol)

pragma solidity ^0.8.1;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @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
     *
     * Furthermore, `isContract` will also return true if the target contract within
     * the same transaction is already scheduled for destruction by `SELFDESTRUCT`,
     * which only has an effect at the end of a transaction.
     * ====
     *
     * [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://consensys.net/diligence/blog/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/v0.8.0/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 Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     *
     * _Available since v3.4._
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionDelegateCall(target, data, "Address: low-level delegate call failed");
    }

    /**
     * @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,
        string memory errorMessage
    ) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(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 v4.9.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

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

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

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

pragma solidity ^0.8.0;

import "../IERC20.sol";

/**
 * @dev Interface for the optional metadata functions from the ERC20 standard.
 *
 * _Available since v4.1._
 */
interface IERC20Metadata is IERC20 {
    /**
     * @dev Returns the name of the token.
     */
    function name() external view returns (string memory);

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

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

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

pragma solidity ^0.8.0;

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable2Step.sol)

pragma solidity ^0.8.0;

import "./Ownable.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 Ownable2Step is Ownable {
    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() public virtual {
        address sender = _msgSender();
        require(pendingOwner() == sender, "Ownable2Step: caller is not the new owner");
        _transferOwnership(sender);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts v4.4.1 (interfaces/IERC1271.sol)

pragma solidity ^0.8.0;

/**
 * @dev Interface of the ERC1271 standard signature validation method for
 * contracts as defined in https://eips.ethereum.org/EIPS/eip-1271[ERC-1271].
 *
 * _Available since v4.1._
 */
interface IERC1271 {
    /**
     * @dev Should return whether the signature provided is valid for the provided data
     * @param hash      Hash of the data to be signed
     * @param signature Signature byte array associated with _data
     */
    function isValidSignature(bytes32 hash, bytes memory signature) external view returns (bytes4 magicValue);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/EIP712.sol)

pragma solidity ^0.8.8;

import "./ECDSA.sol";
import "../ShortStrings.sol";
import "../../interfaces/IERC5267.sol";

/**
 * @dev https://eips.ethereum.org/EIPS/eip-712[EIP 712] is a standard for hashing and signing of typed structured data.
 *
 * The encoding specified in the EIP is very generic, and such a generic implementation in Solidity is not feasible,
 * thus this contract does not implement the encoding itself. Protocols need to implement the type-specific encoding
 * they need in their contracts using a combination of `abi.encode` and `keccak256`.
 *
 * This contract implements the EIP 712 domain separator ({_domainSeparatorV4}) that is used as part of the encoding
 * scheme, and the final step of the encoding to obtain the message digest that is then signed via ECDSA
 * ({_hashTypedDataV4}).
 *
 * The implementation of the domain separator was designed to be as efficient as possible while still properly updating
 * the chain id to protect against replay attacks on an eventual fork of the chain.
 *
 * NOTE: This contract implements the version of the encoding known as "v4", as implemented by the JSON RPC method
 * https://docs.metamask.io/guide/signing-data.html[`eth_signTypedDataV4` in MetaMask].
 *
 * NOTE: In the upgradeable version of this contract, the cached values will correspond to the address, and the domain
 * separator of the implementation contract. This will cause the `_domainSeparatorV4` function to always rebuild the
 * separator from the immutable values, which is cheaper than accessing a cached version in cold storage.
 *
 * _Available since v3.4._
 *
 * @custom:oz-upgrades-unsafe-allow state-variable-immutable state-variable-assignment
 */
abstract contract EIP712 is IERC5267 {
    using ShortStrings for *;

    bytes32 private constant _TYPE_HASH =
        keccak256("EIP712Domain(string name,string version,uint256 chainId,address verifyingContract)");

    // Cache the domain separator as an immutable value, but also store the chain id that it corresponds to, in order to
    // invalidate the cached domain separator if the chain id changes.
    bytes32 private immutable _cachedDomainSeparator;
    uint256 private immutable _cachedChainId;
    address private immutable _cachedThis;

    bytes32 private immutable _hashedName;
    bytes32 private immutable _hashedVersion;

    ShortString private immutable _name;
    ShortString private immutable _version;
    string private _nameFallback;
    string private _versionFallback;

    /**
     * @dev Initializes the domain separator and parameter caches.
     *
     * The meaning of `name` and `version` is specified in
     * https://eips.ethereum.org/EIPS/eip-712#definition-of-domainseparator[EIP 712]:
     *
     * - `name`: the user readable name of the signing domain, i.e. the name of the DApp or the protocol.
     * - `version`: the current major version of the signing domain.
     *
     * NOTE: These parameters cannot be changed except through a xref:learn::upgrading-smart-contracts.adoc[smart
     * contract upgrade].
     */
    constructor(string memory name, string memory version) {
        _name = name.toShortStringWithFallback(_nameFallback);
        _version = version.toShortStringWithFallback(_versionFallback);
        _hashedName = keccak256(bytes(name));
        _hashedVersion = keccak256(bytes(version));

        _cachedChainId = block.chainid;
        _cachedDomainSeparator = _buildDomainSeparator();
        _cachedThis = address(this);
    }

    /**
     * @dev Returns the domain separator for the current chain.
     */
    function _domainSeparatorV4() internal view returns (bytes32) {
        if (address(this) == _cachedThis && block.chainid == _cachedChainId) {
            return _cachedDomainSeparator;
        } else {
            return _buildDomainSeparator();
        }
    }

    function _buildDomainSeparator() private view returns (bytes32) {
        return keccak256(abi.encode(_TYPE_HASH, _hashedName, _hashedVersion, block.chainid, address(this)));
    }

    /**
     * @dev Given an already https://eips.ethereum.org/EIPS/eip-712#definition-of-hashstruct[hashed struct], this
     * function returns the hash of the fully encoded EIP712 message for this domain.
     *
     * This hash can be used together with {ECDSA-recover} to obtain the signer of a message. For example:
     *
     * ```solidity
     * bytes32 digest = _hashTypedDataV4(keccak256(abi.encode(
     *     keccak256("Mail(address to,string contents)"),
     *     mailTo,
     *     keccak256(bytes(mailContents))
     * )));
     * address signer = ECDSA.recover(digest, signature);
     * ```
     */
    function _hashTypedDataV4(bytes32 structHash) internal view virtual returns (bytes32) {
        return ECDSA.toTypedDataHash(_domainSeparatorV4(), structHash);
    }

    /**
     * @dev See {EIP-5267}.
     *
     * _Available since v4.9._
     */
    function eip712Domain()
        public
        view
        virtual
        override
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        )
    {
        return (
            hex"0f", // 01111
            _name.toStringWithFallback(_nameFallback),
            _version.toStringWithFallback(_versionFallback),
            block.chainid,
            address(this),
            bytes32(0),
            new uint256[](0)
        );
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/cryptography/ECDSA.sol)

pragma solidity ^0.8.0;

import "../Strings.sol";

/**
 * @dev Elliptic Curve Digital Signature Algorithm (ECDSA) operations.
 *
 * These functions can be used to verify that a message was signed by the holder
 * of the private keys of a given address.
 */
library ECDSA {
    enum RecoverError {
        NoError,
        InvalidSignature,
        InvalidSignatureLength,
        InvalidSignatureS,
        InvalidSignatureV // Deprecated in v4.8
    }

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

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

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

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

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

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

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

        return (signer, RecoverError.NoError);
    }

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

    /**
     * @dev Returns an Ethereum Signed Message, created from a `hash`. This
     * produces hash corresponding to the one signed with the
     * https://eth.wiki/json-rpc/API#eth_sign[`eth_sign`]
     * JSON-RPC method as part of EIP-191.
     *
     * See {recover}.
     */
    function toEthSignedMessageHash(bytes32 hash) internal pure returns (bytes32 message) {
        // 32 is the length in bytes of hash,
        // enforced by the type signature above
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, "\x19Ethereum Signed Message:\n32")
            mstore(0x1c, hash)
            message := keccak256(0x00, 0x3c)
        }
    }

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

    /**
     * @dev Returns an Ethereum Signed Typed Data, created from a
     * `domainSeparator` and a `structHash`. This produces hash corresponding
     * to the one signed with the
     * https://eips.ethereum.org/EIPS/eip-712[`eth_signTypedData`]
     * JSON-RPC method as part of EIP-712.
     *
     * See {recover}.
     */
    function toTypedDataHash(bytes32 domainSeparator, bytes32 structHash) internal pure returns (bytes32 data) {
        /// @solidity memory-safe-assembly
        assembly {
            let ptr := mload(0x40)
            mstore(ptr, "\x19\x01")
            mstore(add(ptr, 0x02), domainSeparator)
            mstore(add(ptr, 0x22), structHash)
            data := keccak256(ptr, 0x42)
        }
    }

    /**
     * @dev Returns an Ethereum Signed Data with intended validator, created from a
     * `validator` and `data` according to the version 0 of EIP-191.
     *
     * See {recover}.
     */
    function toDataWithIntendedValidatorHash(address validator, bytes memory data) internal pure returns (bytes32) {
        return keccak256(abi.encodePacked("\x19\x00", validator, data));
    }
}

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

/// @notice Gas optimized merkle proof verification library.
/// @author Solmate (https://github.com/transmissions11/solmate/blob/main/src/utils/MerkleProofLib.sol)
/// @author Modified from Solady (https://github.com/Vectorized/solady/blob/main/src/utils/MerkleProofLib.sol)
library MerkleProofLib {
    function verify(
        bytes32[] calldata proof,
        bytes32 root,
        bytes32 leaf
    ) internal pure returns (bool isValid) {
        /// @solidity memory-safe-assembly
        assembly {
            if proof.length {
                // Left shifting by 5 is like multiplying by 32.
                let end := add(proof.offset, shl(5, proof.length))

                // Initialize offset to the offset of the proof in calldata.
                let offset := proof.offset

                // Iterate over proof elements to compute root hash.
                // prettier-ignore
                for {} 1 {} {
                    // Slot where the leaf should be put in scratch space. If
                    // leaf > calldataload(offset): slot 32, otherwise: slot 0.
                    let leafSlot := shl(5, gt(leaf, calldataload(offset)))

                    // Store elements to hash contiguously in scratch space.
                    // The xor puts calldataload(offset) in whichever slot leaf
                    // is not occupying, so 0 if leafSlot is 32, and 32 otherwise.
                    mstore(leafSlot, leaf)
                    mstore(xor(leafSlot, 32), calldataload(offset))

                    // Reuse leaf to store the hash to reduce stack operations.
                    leaf := keccak256(0, 64) // Hash both slots of scratch space.

                    offset := add(offset, 32) // Shift 1 word per cycle.

                    // prettier-ignore
                    if iszero(lt(offset, end)) { break }
                }
            }

            isValid := eq(leaf, root) // The proof is valid if the roots match.
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (access/Ownable.sol)

pragma solidity ^0.8.0;

import "../utils/Context.sol";

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/ShortStrings.sol)

pragma solidity ^0.8.8;

import "./StorageSlot.sol";

// | string  | 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA   |
// | length  | 0x                                                              BB |
type ShortString is bytes32;

/**
 * @dev This library provides functions to convert short memory strings
 * into a `ShortString` type that can be used as an immutable variable.
 *
 * Strings of arbitrary length can be optimized using this library if
 * they are short enough (up to 31 bytes) by packing them with their
 * length (1 byte) in a single EVM word (32 bytes). Additionally, a
 * fallback mechanism can be used for every other case.
 *
 * Usage example:
 *
 * ```solidity
 * contract Named {
 *     using ShortStrings for *;
 *
 *     ShortString private immutable _name;
 *     string private _nameFallback;
 *
 *     constructor(string memory contractName) {
 *         _name = contractName.toShortStringWithFallback(_nameFallback);
 *     }
 *
 *     function name() external view returns (string memory) {
 *         return _name.toStringWithFallback(_nameFallback);
 *     }
 * }
 * ```
 */
library ShortStrings {
    // Used as an identifier for strings longer than 31 bytes.
    bytes32 private constant _FALLBACK_SENTINEL = 0x00000000000000000000000000000000000000000000000000000000000000FF;

    error StringTooLong(string str);
    error InvalidShortString();

    /**
     * @dev Encode a string of at most 31 chars into a `ShortString`.
     *
     * This will trigger a `StringTooLong` error is the input string is too long.
     */
    function toShortString(string memory str) internal pure returns (ShortString) {
        bytes memory bstr = bytes(str);
        if (bstr.length > 31) {
            revert StringTooLong(str);
        }
        return ShortString.wrap(bytes32(uint256(bytes32(bstr)) | bstr.length));
    }

    /**
     * @dev Decode a `ShortString` back to a "normal" string.
     */
    function toString(ShortString sstr) internal pure returns (string memory) {
        uint256 len = byteLength(sstr);
        // using `new string(len)` would work locally but is not memory safe.
        string memory str = new string(32);
        /// @solidity memory-safe-assembly
        assembly {
            mstore(str, len)
            mstore(add(str, 0x20), sstr)
        }
        return str;
    }

    /**
     * @dev Return the length of a `ShortString`.
     */
    function byteLength(ShortString sstr) internal pure returns (uint256) {
        uint256 result = uint256(ShortString.unwrap(sstr)) & 0xFF;
        if (result > 31) {
            revert InvalidShortString();
        }
        return result;
    }

    /**
     * @dev Encode a string into a `ShortString`, or write it to storage if it is too long.
     */
    function toShortStringWithFallback(string memory value, string storage store) internal returns (ShortString) {
        if (bytes(value).length < 32) {
            return toShortString(value);
        } else {
            StorageSlot.getStringSlot(store).value = value;
            return ShortString.wrap(_FALLBACK_SENTINEL);
        }
    }

    /**
     * @dev Decode a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
     */
    function toStringWithFallback(ShortString value, string storage store) internal pure returns (string memory) {
        if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
            return toString(value);
        } else {
            return store;
        }
    }

    /**
     * @dev Return the length of a string that was encoded to `ShortString` or written to storage using {setWithFallback}.
     *
     * WARNING: This will return the "byte length" of the string. This may not reflect the actual length in terms of
     * actual characters as the UTF-8 encoding of a single character can span over multiple bytes.
     */
    function byteLengthWithFallback(ShortString value, string storage store) internal view returns (uint256) {
        if (ShortString.unwrap(value) != _FALLBACK_SENTINEL) {
            return byteLength(value);
        } else {
            return bytes(store).length;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (interfaces/IERC5267.sol)

pragma solidity ^0.8.0;

interface IERC5267 {
    /**
     * @dev MAY be emitted to signal that the domain could have changed.
     */
    event EIP712DomainChanged();

    /**
     * @dev returns the fields and values that describe the domain separator used by this contract for EIP-712
     * signature.
     */
    function eip712Domain()
        external
        view
        returns (
            bytes1 fields,
            string memory name,
            string memory version,
            uint256 chainId,
            address verifyingContract,
            bytes32 salt,
            uint256[] memory extensions
        );
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/Strings.sol)

pragma solidity ^0.8.0;

import "./math/Math.sol";
import "./math/SignedMath.sol";

/**
 * @dev String operations.
 */
library Strings {
    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 = Math.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 `int256` to its ASCII `string` decimal representation.
     */
    function toString(int256 value) internal pure returns (string memory) {
        return string(abi.encodePacked(value < 0 ? "-" : "", toString(SignedMath.abs(value))));
    }

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

    /**
     * @dev Returns true if the two strings are equal.
     */
    function equal(string memory a, string memory b) internal pure returns (bool) {
        return keccak256(bytes(a)) == keccak256(bytes(b));
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/StorageSlot.sol)
// This file was procedurally generated from scripts/generate/templates/StorageSlot.js.

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:
 * ```solidity
 * 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`, `uint256`._
 * _Available since v4.9 for `string`, `bytes`._
 */
library StorageSlot {
    struct AddressSlot {
        address value;
    }

    struct BooleanSlot {
        bool value;
    }

    struct Bytes32Slot {
        bytes32 value;
    }

    struct Uint256Slot {
        uint256 value;
    }

    struct StringSlot {
        string value;
    }

    struct BytesSlot {
        bytes 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
        }
    }

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

    /**
     * @dev Returns an `StringSlot` representation of the string storage pointer `store`.
     */
    function getStringSlot(string storage store) internal pure returns (StringSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }

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

    /**
     * @dev Returns an `BytesSlot` representation of the bytes storage pointer `store`.
     */
    function getBytesSlot(bytes storage store) internal pure returns (BytesSlot storage r) {
        /// @solidity memory-safe-assembly
        assembly {
            r.slot := store.slot
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v4.9.0) (utils/math/Math.sol)

pragma solidity ^0.8.0;

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

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

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

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

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

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

            // Handle non-overflow cases, 256 by 256 division.
            if (prod1 == 0) {
                // Solidity will revert if denominator == 0, unlike the div opcode on its own.
                // The surrounding unchecked block does not change this fact.
                // See https://docs.soliditylang.org/en/latest/control-structures.html#checked-or-unchecked-arithmetic.
                return prod0 / denominator;
            }

            // Make sure the result is less than 2^256. Also prevents denominator == 0.
            require(denominator > prod1, "Math: mulDiv overflow");

            ///////////////////////////////////////////////
            // 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 256, 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 << 3) < value ? 1 : 0);
        }
    }
}

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

pragma solidity ^0.8.0;

/**
 * @dev Standard signed math utilities missing in the Solidity language.
 */
library SignedMath {
    /**
     * @dev Returns the largest of two signed numbers.
     */
    function max(int256 a, int256 b) internal pure returns (int256) {
        return a > b ? a : b;
    }

    /**
     * @dev Returns the smallest of two signed numbers.
     */
    function min(int256 a, int256 b) internal pure returns (int256) {
        return a < b ? a : b;
    }

    /**
     * @dev Returns the average of two signed numbers without overflow.
     * The result is rounded towards zero.
     */
    function average(int256 a, int256 b) internal pure returns (int256) {
        // Formula from the book "Hacker's Delight"
        int256 x = (a & b) + ((a ^ b) >> 1);
        return x + (int256(uint256(x) >> 255) & (a ^ b));
    }

    /**
     * @dev Returns the absolute unsigned value of a signed value.
     */
    function abs(int256 n) internal pure returns (uint256) {
        unchecked {
            // must be unchecked in order to support `n = type(int256).min`
            return uint256(n >= 0 ? n : -n);
        }
    }
}

{
  "remappings": [
    "@openzeppelin/contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "@openzeppelin/contracts/=lib/openzeppelin-contracts/contracts/",
    "forge-std/=lib/forge-std/src/",
    "solidity-helpers/=lib/solidity-helpers/src/",
    "ds-test/=lib/solmate/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts-upgradeable/lib/erc4626-tests/",
    "openzeppelin-contracts-upgradeable/=lib/openzeppelin-contracts-upgradeable/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/",
    "openzeppelin/=lib/openzeppelin-contracts-upgradeable/contracts/",
    "solmate/=lib/solmate/src/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 99999
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "none",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

[{"inputs":[{"internalType":"contract ERC20","name":"_blastToken","type":"address"},{"internalType":"contract Airdrop","name":"_airdrop","type":"address"},{"internalType":"contract LiquidityOracle","name":"_liquidityOracle","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"ActionNotAvailable","type":"error"},{"inputs":[],"name":"ArrayLengthsDoNotMatch","type":"error"},{"inputs":[],"name":"BalanceAlreadySet","type":"error"},{"inputs":[],"name":"InvalidAddress","type":"error"},{"inputs":[],"name":"InvalidSchedule","type":"error"},{"inputs":[],"name":"TargetBalanceNotSet","type":"error"},{"inputs":[],"name":"Unauthorized","type":"error"},{"inputs":[],"name":"VestingHasNotBeenStarted","type":"error"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"version","type":"uint8"}],"name":"Initialized","type":"event"},{"inputs":[],"name":"airdrop","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"balances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"blastToken","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"}],"name":"claim","outputs":[{"internalType":"uint256","name":"vestedAmount","type":"uint256"},{"internalType":"uint256","name":"unvestedAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"claim","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"uint256","name":"","type":"uint256"}],"name":"claimableAddresses","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"account","type":"address"}],"name":"claimableBalance","outputs":[{"internalType":"uint256","name":"vestedAmount","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"initialRecipient","type":"address"},{"internalType":"address","name":"delegatedRecipient","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"}],"name":"deposit","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint32","name":"duration","type":"uint32"},{"internalType":"uint16","name":"rate","type":"uint16"}],"internalType":"struct AirdropVesting.Tranche[]","name":"_schedule","type":"tuple[]"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"lastClaimedTimestamp","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"liquidityOracle","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"}],"name":"recover","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"schedule","outputs":[{"internalType":"uint32","name":"duration","type":"uint32"},{"internalType":"uint16","name":"rate","type":"uint16"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address[]","name":"accounts","type":"address[]"},{"internalType":"uint256[]","name":"amounts","type":"uint256[]"}],"name":"setTargetBalances","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"startVesting","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"}],"name":"targetBalances","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"totalUnvested","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vestingStartTime","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"vestingTarget","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"pure","type":"function"}]

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000000000000000000000000b1a5700fa2358173fe465e6ea4ff52e36e88e2ad000000000000000000000000f7be503166828fe8565c520d66645ac6a06bbdd7000000000000000000000000778b59c24a354a86d51b8d998fe95680e818950a

-----Decoded View---------------
Arg [0] : _blastToken (address): 0xb1a5700fA2358173Fe465e6eA4Ff52E36e88E2ad
Arg [1] : _airdrop (address): 0xF7bE503166828Fe8565C520D66645aC6A06BBdd7
Arg [2] : _liquidityOracle (address): 0x778B59c24A354a86D51b8d998Fe95680e818950a

-----Encoded View---------------
3 Constructor Arguments found :
Arg [0] : 000000000000000000000000b1a5700fa2358173fe465e6ea4ff52e36e88e2ad
Arg [1] : 000000000000000000000000f7be503166828fe8565c520d66645ac6a06bbdd7
Arg [2] : 000000000000000000000000778b59c24a354a86d51b8d998fe95680e818950a