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// SPDX-License-Identifier: MIT
pragma solidity ^0.8.22;

import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";
import "@openzeppelin/contracts/utils/structs/BitMaps.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

/**
 * @title PresailDeck
 * @dev Contract for distributing tokens using a Merkle tree.
 */
contract PresailDeck {
    using SafeERC20 for IERC20;

    struct Distribution {
        bytes32 merkleRoot;
        uint256 lockedTokens;
        uint256 claimedTokens;
        address token;
        bool invalidated;
        address owner;
        bool markedForReplacement;
        bool replaced;
    }

    mapping(uint256 => Distribution) public distributions;
    mapping(uint256 => BitMaps.BitMap) private claimedBitmaps;
    uint256 public distributionsCount;

    event TokensLocked(uint256 indexed distributionId, address indexed owner, bytes32 indexed merkleRoot, uint256 lockedTokens, address token, bool forceExactAmountTransfer);
    event TokensClaimed(uint256 indexed distributionId, address indexed recipient, uint256 amount, address token, address indexed transferRecipient);
    event TokensReclaimed(uint256 indexed distributionId, uint256 reclaimedTokens, address token);
    event TokensDeposited(uint256 indexed distributionId, uint256 lockedTokens, uint256 depositedTokens, address token, bool forceExactAmountTransfer);
    event DistributionSetInvalidated(uint256 indexed distributionId, bool invalidated);
    event DistributionReplaced(uint256 indexed distributionReplacedId, uint256 indexed distributionId, address indexed owner);

    error UnauthorizedAccess(address caller, address owner);
    error DistributionInvalidated(uint256 distributionId);
    error DistributionNotInvalidated(uint256 distributionId);
    error TokensAlreadyClaimed(address recipient);
    error ClaimedTokensExceedLockedAmount(uint256 claimedTokens, uint256 lockedTokens);
    error InvalidMerkleProof();
    error ArraysLengthMismatch();
    error TokenMismatch();
    error DistributionMarkedForReplacement(uint256 distributionId);
    error DistributionNotMarkedForReplacement(uint256 distributionId);
    error DistributionAlreadyReplaced(uint256 distributionId);
    error NonExactAmountTransfer();

    modifier onlyOwner(uint256 _distributionId) {
        if (distributions[_distributionId].owner != msg.sender)
            revert UnauthorizedAccess(msg.sender, distributions[_distributionId].owner);
        _;
    }

    /**
     * @dev Locks tokens in the contract for distribution.
     * @param _token The address of the token contract.
     * @param _totalTokens The total number of tokens to be distributed.
     * @param _merkleRoot The Merkle root of the Merkle tree containing the token distribution.
     * @param _replacesDistribution If this new distribution replaces an existing one
     * @param _distributionToReplace If _replacesDistribution is true, this is the index of the distribution to replace
     */
    function lockTokens(
        address _token,
        uint256 _totalTokens,
        bytes32 _merkleRoot,
        bool _replacesDistribution,
        uint256 _distributionToReplace,
        bool _forceExactAmountTransfer
    ) external {
        uint256 currentDistributionId = distributionsCount;
        uint256 distributionExistingBalance = 0;

        if (_replacesDistribution) {
            Distribution storage distributionToReplace = distributions[_distributionToReplace];

            if (distributionToReplace.replaced)
                revert DistributionAlreadyReplaced(_distributionToReplace);

            if (!distributionToReplace.markedForReplacement)
                revert DistributionNotMarkedForReplacement(_distributionToReplace);

            if (distributionToReplace.owner != msg.sender)
                revert UnauthorizedAccess(msg.sender, distributionToReplace.owner);

            if (distributionToReplace.token != _token)
                revert TokenMismatch();

            distributionToReplace.replaced = true;
            distributionExistingBalance = distributionToReplace.lockedTokens - distributionToReplace.claimedTokens;

            emit DistributionReplaced(_distributionToReplace, currentDistributionId, msg.sender);
        }
        
        distributionsCount++;
        distributions[currentDistributionId].merkleRoot = _merkleRoot;
        distributions[currentDistributionId].token = _token;
        distributions[currentDistributionId].owner = msg.sender;

        uint256 balanceBefore = IERC20(_token).balanceOf(address(this));
        IERC20(_token).safeTransferFrom(msg.sender, address(this), _totalTokens);
        uint256 balanceAfter = IERC20(_token).balanceOf(address(this));
        uint256 netTransferAmount =  balanceAfter - balanceBefore;

        // If we indicated it to force exact amounts, then the total entered and what was actually transferred should be the same.
        if (_forceExactAmountTransfer && _totalTokens != netTransferAmount)
            revert NonExactAmountTransfer();

        distributions[currentDistributionId].lockedTokens = distributionExistingBalance + netTransferAmount;

        emit TokensLocked(currentDistributionId, msg.sender, _merkleRoot, netTransferAmount, _token, _forceExactAmountTransfer);
    }

    /**
     * @dev Claims tokens for a recipient based on a Merkle proof.
     * @param _distributionId The ID of the distribution.
     * @param _index The index of the leaf in the Merkle tree.
     * @param _amount The amount of tokens to claim.
     * @param _proof The Merkle proof for the claimed tokens.
     */
    function claimTokens(uint256 _distributionId, uint256 _index, uint256 _amount, bytes32[] calldata _proof) external {
        _claim(_distributionId, _index, msg.sender, _amount, _proof, msg.sender);
    }

    /**
     * @notice Claims tokens from multiple distributions in a single call.
     * @dev This function allows users to claim tokens from multiple distributions simultaneously, providing an array of distribution IDs, accounts, amounts, and proofs.
     * @param _distributionIds An array of distribution IDs from which tokens will be claimed.
     * @param _indexes An array of indexes for each distribution.
     * @param _amounts An array of amounts of tokens to claim for each distribution.
     * @param _proofs An array of Merkle proofs for each distribution claim.
     */ 
    function claimMultipleTokens(uint256[] calldata _distributionIds, uint256[] calldata _indexes, uint256[] calldata _amounts, bytes32[][] calldata _proofs) external {
        if (_distributionIds.length != _indexes.length ||
            _distributionIds.length != _amounts.length ||
            _distributionIds.length != _proofs.length) {
            revert ArraysLengthMismatch();
        }

        for (uint256 i = 0; i < _distributionIds.length; i++) {
            _claim(_distributionIds[i], _indexes[i], msg.sender, _amounts[i], _proofs[i], msg.sender);
        }
    }

    /**
     * @dev Allows the owner to clawback tokens of a recipient based on a Merkle proof.
     * @param _distributionId The ID of the distribution.
     * @param _index The index of the leaf in the Merkle tree.
     * @param _account The recipient's address to clawback from.
     * @param _amount The amount of tokens to reclaim.
     * @param _proof The Merkle proof for the reclaimed tokens.
     */
    function clawbackTokens(uint256 _distributionId, uint256 _index, address _account, uint256 _amount, bytes32[] calldata _proof) external onlyOwner(_distributionId) {
        Distribution storage distribution = distributions[_distributionId];
        _claim(_distributionId, _index, _account, _amount, _proof, distribution.owner);
    }

    /**
     * @dev Internal function to handle token claims.
     * @param _distributionId The ID of the distribution.
     * @param _index The index of the leaf in the Merkle tree.
     * @param _recipient The recipient's address.
     * @param _amount The amount of tokens to claim.
     * @param _proof The Merkle proof for the claimed tokens.
     * @param _transferRecipient The address to transfer the claimed tokens to.
     */
    function _claim(uint256 _distributionId, uint256 _index, address _recipient, uint256 _amount, bytes32[] calldata _proof, address _transferRecipient) internal {
        Distribution storage distribution = distributions[_distributionId];

        if (distribution.invalidated)
            revert DistributionInvalidated(_distributionId);

        if (isClaimed(_distributionId, _index))
            revert TokensAlreadyClaimed(_recipient);

        if (!MerkleProof.verifyCalldata(_proof, distribution.merkleRoot, _leaf(_index, _recipient, _amount)))
            revert InvalidMerkleProof();   

        BitMaps.BitMap storage claimedBitmap = claimedBitmaps[_distributionId];
        BitMaps.set(claimedBitmap, _index);
        distribution.claimedTokens = distribution.claimedTokens + _amount;
        
        if (distribution.claimedTokens > distribution.lockedTokens)
            revert ClaimedTokensExceedLockedAmount(distribution.claimedTokens, distribution.lockedTokens);

        IERC20(distribution.token).safeTransfer(_transferRecipient, _amount);
        emit TokensClaimed(_distributionId, _recipient, _amount, distribution.token, _transferRecipient);
    }

    /**
     * @dev Allows the owner to reclaim tokens and invalidates a distribution.
     * To be used in case of emergency or after some deadline if beneficiaries are not claiming anymore.
     * @param _distributionId The ID of the distribution.
     */
    function reclaimTokensAndInvalidateDistribution(uint256 _distributionId) external onlyOwner(_distributionId) {
        Distribution storage distribution = distributions[_distributionId];

        if (distribution.invalidated)
            revert DistributionInvalidated(_distributionId);

        distribution.invalidated = true;
        uint256 tokensLeft = distribution.lockedTokens - distribution.claimedTokens;

        IERC20(distribution.token).safeTransfer(distribution.owner, tokensLeft);
        emit TokensReclaimed(_distributionId, tokensLeft, distribution.token);
        emit DistributionSetInvalidated(_distributionId, true);
    }

    /**
     * @dev Allows the owner to invalidate a distribution and mark it for replacement.
     * To be used for creating a distribution that replaces another distribution.
     * Leaves the tokens still locked in the contract so they can be "transferred" to a new distribution that replaces this one.
     * @param _distributionId The ID of the distribution.
     */
    function invalidateDistributionForReplacement(uint256 _distributionId) external onlyOwner(_distributionId) {
        Distribution storage distribution = distributions[_distributionId];

        // Can only invalidate it for replacement if:
        // - it HAS NOT been invalidated AND
        // - it HAS NOT been already replaced AND
        // - it HAS NOT been marked for replacement (using invalidateDistributionForReplacement)

        if (distribution.invalidated)
            revert DistributionInvalidated(_distributionId);
        
        if (distribution.replaced)
            revert DistributionAlreadyReplaced(_distributionId);

        if (distribution.markedForReplacement)
            revert DistributionMarkedForReplacement(_distributionId);

        distribution.invalidated = true;
        distribution.markedForReplacement = true;

        emit DistributionSetInvalidated(_distributionId, true);
    }

    /**
     * @dev Allows the owner to cancel the invalidation of a distribution that has been marked for replacement.
     * @param _distributionId The ID of the distribution.
     */
    function cancelInvalidateDistributionForReplacement(uint256 _distributionId) external onlyOwner(_distributionId) {
        Distribution storage distribution = distributions[_distributionId];

        // Can only cancel it if:
        // - it HAS been invalidated AND
        // - it HAS NOT been already replaced AND
        // - it HAS been marked for replacement (using invalidateDistributionForReplacement)

        if (!distribution.invalidated)
            revert DistributionNotInvalidated(_distributionId);

        if (distribution.replaced)
            revert DistributionAlreadyReplaced(_distributionId);

        if (!distribution.markedForReplacement)
            revert DistributionNotMarkedForReplacement(_distributionId);

        distribution.invalidated = false;
        distribution.markedForReplacement = false;

        emit DistributionSetInvalidated(_distributionId, false);
    }

    /** 
     * @dev Allows owner to deposit tokens into their distribution.
     * Only to be used if for some reason they initially locked less tokens than the sum of all amounts in tree.
     * @param _distributionId The ID of the distribution.
     * @param _tokenAmount The amount of tokens to deposit.
     */
    function depositTokens(uint256 _distributionId, uint256 _tokenAmount,  bool _forceExactAmountTransfer) external onlyOwner(_distributionId) {
        Distribution storage distribution = distributions[_distributionId];

        if (distribution.invalidated)
            revert DistributionInvalidated(_distributionId);

        uint256 balanceBefore = IERC20(distribution.token).balanceOf(address(this));
        IERC20(distribution.token).safeTransferFrom(msg.sender, address(this), _tokenAmount);
        uint256 balanceAfter = IERC20(distribution.token).balanceOf(address(this));
        uint256 netTransferAmount = balanceAfter - balanceBefore;

        // If we indicated it to force exact mounts, then the total entered and what was actually transferred should be the same.
        if (_forceExactAmountTransfer && _tokenAmount != netTransferAmount)
            revert NonExactAmountTransfer();

        distribution.lockedTokens = distribution.lockedTokens + netTransferAmount;
        
        emit TokensDeposited(_distributionId, distribution.lockedTokens, netTransferAmount, distribution.token, _forceExactAmountTransfer);
    }

    /**
     * @dev Internal function to compute the leaf hash for a given index, account, and amount.
     * @param index The index of the leaf in the Merkle tree.
     * @param account The account address.
     * @param amount The token amount.
     * @return The computed leaf hash.
     */
    function _leaf(uint256 index, address account, uint256 amount) internal pure returns (bytes32) {
        return keccak256(bytes.concat(keccak256(abi.encode(index, account, amount)))); 
    }

    /**
     * @dev Checks if a recipient has already claimed tokens.
     * @param _distributionId The ID of the distribution.
     * @param _index The index of the leaf in the Merkle tree.
     * @return A boolean indicating whether the tokens are already claimed.
     */
    function isClaimed(uint256 _distributionId, uint256 _index) public view returns (bool) {
        return BitMaps.get(claimedBitmaps[_distributionId], _index);
    }

    /**
     * @dev Checks if multiple recipients have already claimed tokens.
     * @param _distributionId The ID of the distribution.
     * @param _indexes The index of the leaf in the Merkle tree.
     * @return An array of booleans indicating whether the tokens are already claimed.
     */
    function areClaimed(uint256 _distributionId, uint256[] calldata _indexes) public view returns (bool[] memory) {
        bool[] memory results = new bool[](_indexes.length);
        for (uint256 i = 0; i < _indexes.length; i++) {
            results[i] = BitMaps.get(claimedBitmaps[_distributionId], _indexes[i]);
        }
        return results;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/extensions/IERC20Permit.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC20 Permit extension allowing approvals to be made via signatures, as defined in
 * https://eips.ethereum.org/EIPS/eip-2612[EIP-2612].
 *
 * Adds the {permit} method, which can be used to change an account's ERC20 allowance (see {IERC20-allowance}) by
 * presenting a message signed by the account. By not relying on {IERC20-approve}, the token holder account doesn't
 * need to send a transaction, and thus is not required to hold Ether at all.
 *
 * ==== Security Considerations
 *
 * There are two important considerations concerning the use of `permit`. The first is that a valid permit signature
 * expresses an allowance, and it should not be assumed to convey additional meaning. In particular, it should not be
 * considered as an intention to spend the allowance in any specific way. The second is that because permits have
 * built-in replay protection and can be submitted by anyone, they can be frontrun. A protocol that uses permits should
 * take this into consideration and allow a `permit` call to fail. Combining these two aspects, a pattern that may be
 * generally recommended is:
 *
 * ```solidity
 * function doThingWithPermit(..., uint256 value, uint256 deadline, uint8 v, bytes32 r, bytes32 s) public {
 *     try token.permit(msg.sender, address(this), value, deadline, v, r, s) {} catch {}
 *     doThing(..., value);
 * }
 *
 * function doThing(..., uint256 value) public {
 *     token.safeTransferFrom(msg.sender, address(this), value);
 *     ...
 * }
 * ```
 *
 * Observe that: 1) `msg.sender` is used as the owner, leaving no ambiguity as to the signer intent, and 2) the use of
 * `try/catch` allows the permit to fail and makes the code tolerant to frontrunning. (See also
 * {SafeERC20-safeTransferFrom}).
 *
 * Additionally, note that smart contract wallets (such as Argent or Safe) are not able to produce permit signatures, so
 * contracts should have entry points that don't rely on permit.
 */
interface IERC20Permit {
    /**
     * @dev Sets `value` as the allowance of `spender` over ``owner``'s tokens,
     * given ``owner``'s signed approval.
     *
     * IMPORTANT: The same issues {IERC20-approve} has related to transaction
     * ordering also apply here.
     *
     * Emits an {Approval} event.
     *
     * Requirements:
     *
     * - `spender` cannot be the zero address.
     * - `deadline` must be a timestamp in the future.
     * - `v`, `r` and `s` must be a valid `secp256k1` signature from `owner`
     * over the EIP712-formatted function arguments.
     * - the signature must use ``owner``'s current nonce (see {nonces}).
     *
     * For more information on the signature format, see the
     * https://eips.ethereum.org/EIPS/eip-2612#specification[relevant EIP
     * section].
     *
     * CAUTION: See Security Considerations above.
     */
    function permit(
        address owner,
        address spender,
        uint256 value,
        uint256 deadline,
        uint8 v,
        bytes32 r,
        bytes32 s
    ) external;

    /**
     * @dev Returns the current nonce for `owner`. This value must be
     * included whenever a signature is generated for {permit}.
     *
     * Every successful call to {permit} increases ``owner``'s nonce by one. This
     * prevents a signature from being used multiple times.
     */
    function nonces(address owner) external view returns (uint256);

    /**
     * @dev Returns the domain separator used in the encoding of the signature for {permit}, as defined by {EIP712}.
     */
    // solhint-disable-next-line func-name-mixedcase
    function DOMAIN_SEPARATOR() external view returns (bytes32);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @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 value of tokens in existence.
     */
    function totalSupply() external view returns (uint256);

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

    /**
     * @dev Moves a `value` amount of 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 value) 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 a `value` amount of tokens 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 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the
     * allowance mechanism. `value` 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 value) external returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC20Permit} from "../extensions/IERC20Permit.sol";
import {Address} from "../../../utils/Address.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC20 operations that throw on failure (when the token
 * contract returns false). Tokens that return no value (and instead revert or
 * throw on failure) are also supported, non-reverting calls are assumed to be
 * successful.
 * To use this library you can add a `using SafeERC20 for IERC20;` statement to your contract,
 * which allows you to call the safe operations as `token.safeTransfer(...)`, etc.
 */
library SafeERC20 {
    using Address for address;

    /**
     * @dev An operation with an ERC20 token failed.
     */
    error SafeERC20FailedOperation(address token);

    /**
     * @dev Indicates a failed `decreaseAllowance` request.
     */
    error SafeERC20FailedDecreaseAllowance(address spender, uint256 currentAllowance, uint256 requestedDecrease);

    /**
     * @dev Transfer `value` amount of `token` from the calling contract to `to`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeTransfer(IERC20 token, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Transfer `value` amount of `token` from `from` to `to`, spending the approval given by `from` to the
     * calling contract. If `token` returns no value, non-reverting calls are assumed to be successful.
     */
    function safeTransferFrom(IERC20 token, address from, address to, uint256 value) internal {
        _callOptionalReturn(token, abi.encodeCall(token.transferFrom, (from, to, value)));
    }

    /**
     * @dev Increase the calling contract's allowance toward `spender` by `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful.
     */
    function safeIncreaseAllowance(IERC20 token, address spender, uint256 value) internal {
        uint256 oldAllowance = token.allowance(address(this), spender);
        forceApprove(token, spender, oldAllowance + value);
    }

    /**
     * @dev Decrease the calling contract's allowance toward `spender` by `requestedDecrease`. If `token` returns no
     * value, non-reverting calls are assumed to be successful.
     */
    function safeDecreaseAllowance(IERC20 token, address spender, uint256 requestedDecrease) internal {
        unchecked {
            uint256 currentAllowance = token.allowance(address(this), spender);
            if (currentAllowance < requestedDecrease) {
                revert SafeERC20FailedDecreaseAllowance(spender, currentAllowance, requestedDecrease);
            }
            forceApprove(token, spender, currentAllowance - requestedDecrease);
        }
    }

    /**
     * @dev Set the calling contract's allowance toward `spender` to `value`. If `token` returns no value,
     * non-reverting calls are assumed to be successful. Meant to be used with tokens that require the approval
     * to be set to zero before setting it to a non-zero value, such as USDT.
     */
    function forceApprove(IERC20 token, address spender, uint256 value) internal {
        bytes memory approvalCall = abi.encodeCall(token.approve, (spender, value));

        if (!_callOptionalReturnBool(token, approvalCall)) {
            _callOptionalReturn(token, abi.encodeCall(token.approve, (spender, 0)));
            _callOptionalReturn(token, approvalCall);
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We use {Address-functionCall} to perform this call, which verifies that
        // the target address contains contract code and also asserts for success in the low-level call.

        bytes memory returndata = address(token).functionCall(data);
        if (returndata.length != 0 && !abi.decode(returndata, (bool))) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Imitates a Solidity high-level call (i.e. a regular function call to a contract), relaxing the requirement
     * on the return value: the return value is optional (but if data is returned, it must not be false).
     * @param token The token targeted by the call.
     * @param data The call data (encoded using abi.encode or one of its variants).
     *
     * This is a variant of {_callOptionalReturn} that silents catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        // We need to perform a low level call here, to bypass Solidity's return data size checking mechanism, since
        // we're implementing it ourselves. We cannot use {Address-functionCall} here since this should return false
        // and not revert is the subcall reverts.

        (bool success, bytes memory returndata) = address(token).call(data);
        return success && (returndata.length == 0 || abi.decode(returndata, (bool))) && address(token).code.length > 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/Address.sol)

pragma solidity ^0.8.20;

/**
 * @dev Collection of functions related to the address type
 */
library Address {
    /**
     * @dev The ETH balance of the account is not enough to perform the operation.
     */
    error AddressInsufficientBalance(address account);

    /**
     * @dev There's no code at `target` (it is not a contract).
     */
    error AddressEmptyCode(address target);

    /**
     * @dev A call to an address target failed. The target may have reverted.
     */
    error FailedInnerCall();

    /**
     * @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/v0.8.20/security-considerations.html#use-the-checks-effects-interactions-pattern[checks-effects-interactions pattern].
     */
    function sendValue(address payable recipient, uint256 amount) internal {
        if (address(this).balance < amount) {
            revert AddressInsufficientBalance(address(this));
        }

        (bool success, ) = recipient.call{value: amount}("");
        if (!success) {
            revert FailedInnerCall();
        }
    }

    /**
     * @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 or custom error, it is bubbled
     * up by this function (like regular Solidity function calls). However, if
     * the call reverted with no returned reason, this function reverts with a
     * {FailedInnerCall} error.
     *
     * 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.
     */
    function functionCall(address target, bytes memory data) internal returns (bytes memory) {
        return functionCallWithValue(target, data, 0);
    }

    /**
     * @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`.
     */
    function functionCallWithValue(address target, bytes memory data, uint256 value) internal returns (bytes memory) {
        if (address(this).balance < value) {
            revert AddressInsufficientBalance(address(this));
        }
        (bool success, bytes memory returndata) = target.call{value: value}(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

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

    /**
     * @dev Same as {xref-Address-functionCall-address-bytes-}[`functionCall`],
     * but performing a delegate call.
     */
    function functionDelegateCall(address target, bytes memory data) internal returns (bytes memory) {
        (bool success, bytes memory returndata) = target.delegatecall(data);
        return verifyCallResultFromTarget(target, success, returndata);
    }

    /**
     * @dev Tool to verify that a low level call to smart-contract was successful, and reverts if the target
     * was not a contract or bubbling up the revert reason (falling back to {FailedInnerCall}) in case of an
     * unsuccessful call.
     */
    function verifyCallResultFromTarget(
        address target,
        bool success,
        bytes memory returndata
    ) internal view returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            // only check if target is a contract if the call was successful and the return data is empty
            // otherwise we already know that it was a contract
            if (returndata.length == 0 && target.code.length == 0) {
                revert AddressEmptyCode(target);
            }
            return returndata;
        }
    }

    /**
     * @dev Tool to verify that a low level call was successful, and reverts if it wasn't, either by bubbling the
     * revert reason or with a default {FailedInnerCall} error.
     */
    function verifyCallResult(bool success, bytes memory returndata) internal pure returns (bytes memory) {
        if (!success) {
            _revert(returndata);
        } else {
            return returndata;
        }
    }

    /**
     * @dev Reverts with returndata if present. Otherwise reverts with {FailedInnerCall}.
     */
    function _revert(bytes memory returndata) 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 FailedInnerCall();
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/cryptography/MerkleProof.sol)

pragma solidity ^0.8.20;

/**
 * @dev These functions deal with verification of Merkle Tree proofs.
 *
 * The tree and the proofs can be generated using our
 * https://github.com/OpenZeppelin/merkle-tree[JavaScript library].
 * You will find a quickstart guide in the readme.
 *
 * WARNING: You should avoid using leaf values that are 64 bytes long prior to
 * hashing, or use a hash function other than keccak256 for hashing leaves.
 * This is because the concatenation of a sorted pair of internal nodes in
 * the Merkle tree could be reinterpreted as a leaf value.
 * OpenZeppelin's JavaScript library generates Merkle trees that are safe
 * against this attack out of the box.
 */
library MerkleProof {
    /**
     *@dev The multiproof provided is not valid.
     */
    error MerkleProofInvalidMultiproof();

    /**
     * @dev Returns true if a `leaf` can be proved to be a part of a Merkle tree
     * defined by `root`. For this, a `proof` must be provided, containing
     * sibling hashes on the branch from the leaf to the root of the tree. Each
     * pair of leaves and each pair of pre-images are assumed to be sorted.
     */
    function verify(bytes32[] memory proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProof(proof, leaf) == root;
    }

    /**
     * @dev Calldata version of {verify}
     */
    function verifyCalldata(bytes32[] calldata proof, bytes32 root, bytes32 leaf) internal pure returns (bool) {
        return processProofCalldata(proof, leaf) == root;
    }

    /**
     * @dev Returns the rebuilt hash obtained by traversing a Merkle tree up
     * from `leaf` using `proof`. A `proof` is valid if and only if the rebuilt
     * hash matches the root of the tree. When processing the proof, the pairs
     * of leafs & pre-images are assumed to be sorted.
     */
    function processProof(bytes32[] memory proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Calldata version of {processProof}
     */
    function processProofCalldata(bytes32[] calldata proof, bytes32 leaf) internal pure returns (bytes32) {
        bytes32 computedHash = leaf;
        for (uint256 i = 0; i < proof.length; i++) {
            computedHash = _hashPair(computedHash, proof[i]);
        }
        return computedHash;
    }

    /**
     * @dev Returns true if the `leaves` can be simultaneously proven to be a part of a Merkle tree defined by
     * `root`, according to `proof` and `proofFlags` as described in {processMultiProof}.
     *
     * CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
     */
    function multiProofVerify(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProof(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Calldata version of {multiProofVerify}
     *
     * CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
     */
    function multiProofVerifyCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32 root,
        bytes32[] memory leaves
    ) internal pure returns (bool) {
        return processMultiProofCalldata(proof, proofFlags, leaves) == root;
    }

    /**
     * @dev Returns the root of a tree reconstructed from `leaves` and sibling nodes in `proof`. The reconstruction
     * proceeds by incrementally reconstructing all inner nodes by combining a leaf/inner node with either another
     * leaf/inner node or a proof sibling node, depending on whether each `proofFlags` item is true or false
     * respectively.
     *
     * CAUTION: Not all Merkle trees admit multiproofs. To use multiproofs, it is sufficient to ensure that: 1) the tree
     * is complete (but not necessarily perfect), 2) the leaves to be proven are in the opposite order they are in the
     * tree (i.e., as seen from right to left starting at the deepest layer and continuing at the next layer).
     */
    function processMultiProof(
        bytes32[] memory proof,
        bool[] memory proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the Merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        if (leavesLen + proofLen != totalHashes + 1) {
            revert MerkleProofInvalidMultiproof();
        }

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            if (proofPos != proofLen) {
                revert MerkleProofInvalidMultiproof();
            }
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Calldata version of {processMultiProof}.
     *
     * CAUTION: Not all Merkle trees admit multiproofs. See {processMultiProof} for details.
     */
    function processMultiProofCalldata(
        bytes32[] calldata proof,
        bool[] calldata proofFlags,
        bytes32[] memory leaves
    ) internal pure returns (bytes32 merkleRoot) {
        // This function rebuilds the root hash by traversing the tree up from the leaves. The root is rebuilt by
        // consuming and producing values on a queue. The queue starts with the `leaves` array, then goes onto the
        // `hashes` array. At the end of the process, the last hash in the `hashes` array should contain the root of
        // the Merkle tree.
        uint256 leavesLen = leaves.length;
        uint256 proofLen = proof.length;
        uint256 totalHashes = proofFlags.length;

        // Check proof validity.
        if (leavesLen + proofLen != totalHashes + 1) {
            revert MerkleProofInvalidMultiproof();
        }

        // The xxxPos values are "pointers" to the next value to consume in each array. All accesses are done using
        // `xxx[xxxPos++]`, which return the current value and increment the pointer, thus mimicking a queue's "pop".
        bytes32[] memory hashes = new bytes32[](totalHashes);
        uint256 leafPos = 0;
        uint256 hashPos = 0;
        uint256 proofPos = 0;
        // At each step, we compute the next hash using two values:
        // - a value from the "main queue". If not all leaves have been consumed, we get the next leaf, otherwise we
        //   get the next hash.
        // - depending on the flag, either another value from the "main queue" (merging branches) or an element from the
        //   `proof` array.
        for (uint256 i = 0; i < totalHashes; i++) {
            bytes32 a = leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++];
            bytes32 b = proofFlags[i]
                ? (leafPos < leavesLen ? leaves[leafPos++] : hashes[hashPos++])
                : proof[proofPos++];
            hashes[i] = _hashPair(a, b);
        }

        if (totalHashes > 0) {
            if (proofPos != proofLen) {
                revert MerkleProofInvalidMultiproof();
            }
            unchecked {
                return hashes[totalHashes - 1];
            }
        } else if (leavesLen > 0) {
            return leaves[0];
        } else {
            return proof[0];
        }
    }

    /**
     * @dev Sorts the pair (a, b) and hashes the result.
     */
    function _hashPair(bytes32 a, bytes32 b) private pure returns (bytes32) {
        return a < b ? _efficientHash(a, b) : _efficientHash(b, a);
    }

    /**
     * @dev Implementation of keccak256(abi.encode(a, b)) that doesn't allocate or expand memory.
     */
    function _efficientHash(bytes32 a, bytes32 b) private pure returns (bytes32 value) {
        /// @solidity memory-safe-assembly
        assembly {
            mstore(0x00, a)
            mstore(0x20, b)
            value := keccak256(0x00, 0x40)
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/structs/BitMaps.sol)
pragma solidity ^0.8.20;

/**
 * @dev Library for managing uint256 to bool mapping in a compact and efficient way, provided the keys are sequential.
 * Largely inspired by Uniswap's https://github.com/Uniswap/merkle-distributor/blob/master/contracts/MerkleDistributor.sol[merkle-distributor].
 *
 * BitMaps pack 256 booleans across each bit of a single 256-bit slot of `uint256` type.
 * Hence booleans corresponding to 256 _sequential_ indices would only consume a single slot,
 * unlike the regular `bool` which would consume an entire slot for a single value.
 *
 * This results in gas savings in two ways:
 *
 * - Setting a zero value to non-zero only once every 256 times
 * - Accessing the same warm slot for every 256 _sequential_ indices
 */
library BitMaps {
    struct BitMap {
        mapping(uint256 bucket => uint256) _data;
    }

    /**
     * @dev Returns whether the bit at `index` is set.
     */
    function get(BitMap storage bitmap, uint256 index) internal view returns (bool) {
        uint256 bucket = index >> 8;
        uint256 mask = 1 << (index & 0xff);
        return bitmap._data[bucket] & mask != 0;
    }

    /**
     * @dev Sets the bit at `index` to the boolean `value`.
     */
    function setTo(BitMap storage bitmap, uint256 index, bool value) internal {
        if (value) {
            set(bitmap, index);
        } else {
            unset(bitmap, index);
        }
    }

    /**
     * @dev Sets the bit at `index`.
     */
    function set(BitMap storage bitmap, uint256 index) internal {
        uint256 bucket = index >> 8;
        uint256 mask = 1 << (index & 0xff);
        bitmap._data[bucket] |= mask;
    }

    /**
     * @dev Unsets the bit at `index`.
     */
    function unset(BitMap storage bitmap, uint256 index) internal {
        uint256 bucket = index >> 8;
        uint256 mask = 1 << (index & 0xff);
        bitmap._data[bucket] &= ~mask;
    }
}

{
  "evmVersion": "paris",
  "optimizer": {
    "enabled": false,
    "runs": 200
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
        "devdoc",
        "userdoc",
        "metadata",
        "abi"
      ]
    }
  },
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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