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// SPDX-License-Identifier: MIT
// This file is part of the MultisigWallet project.
// Portions of this code are derived from the OpenZeppelin Contracts library.
// OpenZeppelin Contracts are licensed under the MIT License.
// See the LICENSE and NOTICE files for more details.
pragma solidity ^0.8.7;

import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721.sol";
import "@openzeppelin/contracts/token/ERC721/IERC721Receiver.sol";

/**
 * @title MultisigWallet
 * @dev A multisig wallet contract that requires multiple confirmations for transactions, including managing owners.
 */
contract MultisigWallet is ReentrancyGuard, IERC721Receiver {
    /**
     * @notice Emitted when a deposit is made.
     * @param sender The address that sent the deposit.
     * @param amountOrTokenId The amount of Ether or the token ID for ERC721 deposits.
     * @param balance The new balance of the wallet after the deposit.
     */
    event Deposit(address indexed sender, uint256 indexed amountOrTokenId, uint256 indexed balance);

    /**
     * @notice Emitted when a transaction is submitted.
     * @param _transactionType The type of the submitted transaction.
     * @param txIndex The index of the submitted transaction.
     * @param to The address to which the transaction is directed.
     * @param value The amount of Ether sent in the transaction.
     * @param tokenAddress The address of the token contract (if applicable).
     * @param amountOrTokenId The amount of tokens or the token ID (if applicable).
     * @param owner The address of the owner who submitted the transaction.
     * @param data The data payload of the transaction.
     */
    event SubmitTransaction(
        TransactionType indexed _transactionType,
        uint256 indexed txIndex,
        address indexed to,
        uint256 value,
        address tokenAddress,
        uint256 amountOrTokenId,
        address owner,
        bytes data
    );

    /**
     * @notice Emitted when a transaction is confirmed by an owner.
     * @param owner The address of the owner who confirmed the transaction.
     * @param txIndex The index of the confirmed transaction.
     */
    event ConfirmTransaction(address indexed owner, uint256 indexed txIndex);

    /**
     * @notice Emitted when a confirmation for a transaction is revoked by an owner.
     * @param owner The address of the owner who revoked the confirmation.
     * @param txIndex The index of the transaction for which the confirmation was revoked.
     */
    event RevokeConfirmation(address indexed owner, uint256 indexed txIndex);

    /**
     * @notice Emitted when a transaction is executed.
     * @param _transactionType The type of the executed transaction.
     * @param txIndex The index of the executed transaction.
     * @param to The address to which the transaction was sent.
     * @param value The amount of Ether sent in the transaction.
     * @param tokenAddress The address of the token contract (if applicable).
     * @param amountOrTokenId The amount of tokens or the token ID (if applicable).
     * @param owner The address of the owner who executed the transaction.
     * @param data The data payload of the transaction.
     */
    event ExecuteTransaction(
        TransactionType indexed _transactionType,
        uint256 indexed txIndex,
        address indexed to,
        uint256 value,
        address tokenAddress,
        uint256 amountOrTokenId,
        address owner,
        bytes data
    );

    /**
     * @notice Emitted for each transfer within a batch transaction.
     * @param recipient The recipient address of the transfer.
     * @param tokenAddress The token contract address (if applicable, `address(0)` for Ether).
     * @param value The amount of Ether or ERC20 tokens transferred.
     * @param tokenId The ID of the ERC721 token transferred (if applicable).
     * @notice Test a large BatchTransfer on a local testnet first to check if the gascosts are within the EVM constraint
     */
    event BatchTransferExecuted(
        address indexed recipient, address indexed tokenAddress, uint256 value, uint256 indexed tokenId
    );

    /**
     * @notice Emitted when a new owner is added to the multisig wallet.
     * @param owner The address of the owner that was added.
     */
    event OwnerAdded(address indexed owner);

    /**
     * @notice Emitted when an owner is removed from the multisig wallet.
     * @param owner The address of the owner that was removed.
     */
    event OwnerRemoved(address indexed owner);

    /**
     * @notice Emitted when all pending transactions are deactivated.
     */
    event PendingTransactionsDeactivated();

    /**
     * @notice Emitted when an owner deactivates their own pending transaction.
     * @param txIndex The index of the transaction that was deactivated.
     * @param owner The address of the owner who deactivated the transaction.
     */
    event DeactivatedMyPendingTransaction(uint256 indexed txIndex, address indexed owner);

    /**
     * @notice Emitted when the contract receives an ERC721 token.
     * @param operator The address which initiated the transfer (i.e., msg.sender).
     * @param from The address which previously owned the token.
     * @param tokenId The identifier of the token being transferred.
     * @param data Additional data with no specified format.
     */
    event ERC721Received(address indexed operator, address indexed from, uint256 indexed tokenId, bytes data);

    /**
     * @enum TransactionType
     * @dev Represents the type of transaction in the multisig wallet.
     * @param ETH Ether transfer.
     * @param ERC20 ERC20 token transfer.
     * @param ERC721 ERC721 token transfer.
     * @param AddOwner Adding a new owner.
     * @param RemoveOwner Removing an existing owner.
     * @param BatchTransaction multiple transfers in one ransaction.
     * @param Other Any other transaction type.
     */
    enum TransactionType {
        ETH, // 0
        ERC20, // 1
        ERC721, // 2
        AddOwner, // 3
        RemoveOwner, // 4
        BatchTransaction, // 5
        Other // 6

    }

    /**
     * @struct Transaction
     * @dev Represents a transaction within the multisig wallet.
     * @param transactionType The type of the transaction.
     * @param isActive Indicates if the transaction is active.
     * @param numConfirmations The number of confirmations the transaction has received.
     * @param owner The address of the owner who submitted the transaction.
     * @param to The destination address of the transaction.
     * @param value The amount of Ether involved in the transaction.
     * @param data The data payload of the transaction.
     */
    struct Transaction {
        TransactionType transactionType;
        bool isActive;
        uint64 numConfirmations;
        address owner;
        address to;
        uint256 value;
        bytes data;
    }

    /// @notice Struct to represent individual bulk transfer details
    struct BatchTransaction {
        address to; // Recipient address
        address tokenAddress; // Token contract address (address(0) for ETH)
        uint256 value; // Ether amount (if ETH) or token amount
        uint256 tokenId; // Token ID (for ERC721)
    }

    /// @notice Array of multisig wallet owners.
    address[] public owners;

    /// @notice Mapping to check if an address is an owner.
    mapping(address => bool) public isOwner;

    /// @notice Nested mapping to track confirmations: transaction index => owner => confirmation status.
    mapping(uint256 => mapping(address => bool)) public isConfirmed;

    /// @notice Array of all submitted transactions.
    Transaction[] public transactions;

    /**
     * @notice Modifier to restrict access to only multisig owners.
     * @dev Reverts if the caller is not an owner.
     */
    modifier onlyMultisigOwner() {
        require(isOwner[msg.sender], "MultisigWallet: Not a multisig owner");
        _;
    }

    /**
     * @notice Modifier to check if a transaction exists.
     * @dev Reverts if the transaction does not exist.
     * @param _txIndex The index of the transaction.
     */
    modifier txExists(uint256 _txIndex) {
        require(_txIndex < transactions.length, "MultisigWallet: Transaction does not exist");
        _;
    }

    /**
     * @notice Modifier to check if a transaction is active.
     * @dev Reverts if the transaction is not active.
     * @param _txIndex The index of the transaction.
     */
    modifier isActive(uint256 _txIndex) {
        require(transactions[_txIndex].isActive, "MultisigWallet: Transaction not active");
        _;
    }

    /**
     * @notice Modifier to ensure the transaction has not been confirmed by the caller.
     * @dev Reverts if the transaction is already confirmed by the caller.
     * @param _txIndex The index of the transaction.
     */
    modifier notConfirmed(uint256 _txIndex) {
        require(!isConfirmed[_txIndex][msg.sender], "MultisigWallet: transaction already confirmed by this owner");
        _;
    }

    /**
     * @notice Initializes the multisig wallet with a list of owners.
     * @dev The constructor sets the initial owners and ensures no duplicates or zero addresses.
     * @param _owners The array of addresses to be set as initial owners.
     */
    constructor(address[] memory _owners) {
        require(_owners.length > 0, "MultisigWallet: at least one owner required");

        for (uint256 i = 0; i < _owners.length; i++) {
            address owner = _owners[i];
            require(owner != address(0), "MultisigWallet: owner address cannot be zero");
            require(!isOwner[owner], "MultisigWallet: duplicate owner address");

            isOwner[owner] = true;
            owners.push(owner);
        }
    }

    /**
     * @notice Fallback function to receive Ether.
     * @dev Emits a {Deposit} event upon receiving Ether.
     */
    receive() external payable {
        emit Deposit(msg.sender, msg.value, address(this).balance);
    }

    /**
     * @notice Submits a transaction to be confirmed by the owners.
     * @dev Depending on the transaction type, it decodes the data and emits a {SubmitTransaction} event. Once submitted the transaction gets directly confirmed for that owner by calling the confirmTransaction funcion.
     * @param _transactionType The type of the transaction.
     * @param _to The address to send the transaction to.
     * @param _value The amount of Ether to send (if applicable).
     * @param _data The data payload of the transaction.
     */
    function submitTransaction(TransactionType _transactionType, address _to, uint256 _value, bytes memory _data)
        public
        onlyMultisigOwner
    {
        uint256 txIndex = transactions.length;

        transactions.push(
            Transaction({
                transactionType: _transactionType,
                to: _to,
                value: _value,
                data: _data,
                isActive: true,
                numConfirmations: 0,
                owner: msg.sender
            })
        );

        address recipient = _to;
        address tokenAddress = address(0);
        uint256 _amountOrTokenId = 0;

        if (_transactionType == TransactionType.ERC20 || _transactionType == TransactionType.ERC721) {
            // Decode the data to extract the token address and amount / tokenId
            (address to, uint256 amountOrTokenId) = decodeTransactionData(_transactionType, _data);
            recipient = to;
            tokenAddress = _to;
            _amountOrTokenId = amountOrTokenId;
        }

        emit SubmitTransaction(
            _transactionType, txIndex, recipient, _value, tokenAddress, _amountOrTokenId, msg.sender, _data
        );

        confirmTransaction(txIndex);
    }

    /**
     * @notice Confirms a submitted transaction.
     * @dev Increments the confirmation count and executes the transaction if enough confirmations are reached.
     * @param _txIndex The index of the transaction to confirm.
     */
    function confirmTransaction(uint256 _txIndex)
        public
        onlyMultisigOwner
        txExists(_txIndex)
        isActive(_txIndex)
        notConfirmed(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];
        isConfirmed[_txIndex][msg.sender] = true;
        uint64 newNumConfirmations = transaction.numConfirmations + 1; // doing that to safe gas
        transaction.numConfirmations = newNumConfirmations;

        TransactionType txType = transaction.transactionType; // doing that to safe gas in the hasEnoughConfirmations function

        emit ConfirmTransaction(msg.sender, _txIndex);

        if (hasEnoughConfirmations(newNumConfirmations, txType)) {
            executeTransaction(_txIndex); // this means that the owner who gives the last needed confirmation has to pay for the execution gas fees
        }
    }

    /**
     * @notice Executes a confirmed transaction.
     * @dev Performs the actual transaction based on its type and marks it as inactive after execution. For adding or removing multisig owners, the respective internal function get called.
     * @param _txIndex The index of the transaction to execute.
     */
    function executeTransaction(uint256 _txIndex)
        public
        txExists(_txIndex)
        isActive(_txIndex)
        nonReentrant
        onlyMultisigOwner
    {
        Transaction storage transaction = transactions[_txIndex];

        uint64 numConfirmations = transaction.numConfirmations;
        TransactionType txType = transaction.transactionType;

        require(
            hasEnoughConfirmations(numConfirmations, txType), "MultisigWallet: insufficient confirmations to execute"
        );

        address to = transaction.to;
        uint256 value = transaction.value;
        bytes memory data = transaction.data;
        address recipient = to;
        address tokenAddress = address(0);
        uint256 amountOrTokenId = 0;

        if (txType == TransactionType.BatchTransaction) {
            BatchTransaction[] memory transfers = abi.decode(data, (BatchTransaction[]));
            uint256 len = transfers.length;

            for (uint256 i = 0; i < len; i++) {
                BatchTransaction memory transfer = transfers[i];
                if (transfer.tokenAddress == address(0)) {
                    // Ether transfer
                    require((transfer.tokenId == 0), "BatchTransfer: ETH transfer with TokenId doesn't make sense");
                    (bool success,) = transfer.to.call{value: transfer.value}("");
                    require(success, "BatchTransfer: Ether transfer failed");
                } else if (transfer.tokenId == 0) {
                    // ERC20 transfer
                    require(
                        IERC20(transfer.tokenAddress).transfer(transfer.to, transfer.value),
                        "BatchTransfer: ERC20 transfer failed"
                    );
                } else {
                    // ERC721 transfer
                    IERC721(transfer.tokenAddress).safeTransferFrom(address(this), transfer.to, transfer.tokenId);
                }
                // Emit BatchTransferExecuted event
                emit BatchTransferExecuted(transfer.to, transfer.tokenAddress, transfer.value, transfer.tokenId);
            }
        }

        if (txType == TransactionType.AddOwner) {
            addOwnerInternal(to, _txIndex);
        } else if (txType == TransactionType.RemoveOwner) {
            removeOwnerInternal(to, _txIndex);
        }

        if (txType == TransactionType.ETH || txType == TransactionType.Other) {
            require(to != address(this), "MultisigWallet: cannot call internal functions");
            (bool success,) = to.call{value: value}(data);
            require(success, "MultisigWallet: external call failed");
        }

        if (txType == TransactionType.ERC20 || txType == TransactionType.ERC721) {
            require(to != address(this), "MultisigWallet: cannot call internal functions");
            (bool success,) = to.call{value: value}(data);
            require(success, "MultisigWallet: external call failed");
            // Decode the data to extract the token address and amount / tokenId
            (address _to, uint256 _amountOrTokenId) = decodeTransactionData(txType, data);
            recipient = _to;
            tokenAddress = to;
            amountOrTokenId = _amountOrTokenId;
        }

        transaction.isActive = false;

        emit ExecuteTransaction(txType, _txIndex, recipient, value, tokenAddress, amountOrTokenId, msg.sender, data);
    }

    /**
     * @notice Revokes a confirmation for a transaction.
     * @dev Decrements the confirmation count.
     * @param _txIndex The index of the transaction to revoke confirmation for.
     */
    function revokeConfirmation(uint256 _txIndex) public onlyMultisigOwner txExists(_txIndex) isActive(_txIndex) {
        Transaction storage transaction = transactions[_txIndex];
        require(transaction.isActive, "MultisigWallet: Transaction is not active");
        require(isConfirmed[_txIndex][msg.sender], "MultisigWallet: Transaction has not been confirmed");

        transaction.numConfirmations -= 1;
        isConfirmed[_txIndex][msg.sender] = false;

        emit RevokeConfirmation(msg.sender, _txIndex);
    }

    /**
     * @notice Submits a transaction to send Ether to a specified address.
     * @dev Utilizes {submitTransaction} with `TransactionType.ETH`.
     * @param _to The recipient address.
     * @param _amount The amount of Ether to send (in Wei).
     */
    function sendETH(address _to, uint256 _amount) public onlyMultisigOwner {
        require(_to != address(0), "MultisigWallet: receiver address required");
        require(_amount > 0, "MultisigWallet: Ether (Wei) amount required");
        submitTransaction(TransactionType.ETH, _to, _amount, "");
    }

    /**
     * @notice Adds a new owner to the multisig wallet.
     * @dev Submits a transaction of type `AddOwner` which requires confirmations.
     * @param _newOwner The address of the new owner to be added.
     */
    function addOwner(address _newOwner) public onlyMultisigOwner {
        require(_newOwner != address(0), "MultisigWallet: new owner address required");
        require(!isOwner[_newOwner], "MultisigWallet: owner already exists");
        submitTransaction(TransactionType.AddOwner, _newOwner, 0, "");
    }

    /**
     * @notice Internal function to add a new owner after sufficient confirmations.
     * @dev Adds the new owner, updates mappings, and emits an {OwnerAdded} event.
     * @param _newOwner The address of the new owner to be added.
     * @param _txIndex The index of the transaction that triggered the addition.
     */
    function addOwnerInternal(address _newOwner, uint256 _txIndex)
        internal
        onlyMultisigOwner
        txExists(_txIndex)
        isActive(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];
        require(
            transaction.numConfirmations * 3 >= owners.length * 2,
            "MultisigWallet: insufficient confirmations to add owner"
        );

        require(!isOwner[_newOwner], "MultisigWallet: address is already an owner");

        // Clear pending transactions before adding the new owner
        deactivatePendingTransactions();

        isOwner[_newOwner] = true;
        owners.push(_newOwner);

        emit OwnerAdded(_newOwner);
    }

    /**
     * @notice Removes an existing owner from the multisig wallet.
     * @dev Submits a transaction of type `RemoveOwner` which requires confirmations.
     * @param _owner The address of the owner to be removed.
     */
    function removeOwner(address _owner) public onlyMultisigOwner {
        require(_owner != address(0), "MultisigWallet: owner Address that is to be removed is required");
        require(isOwner[_owner], "MultisigWallet: address is not an owner");
        submitTransaction(TransactionType.RemoveOwner, _owner, 0, "");
    }

    /**
     * @notice Internal function to remove an owner after sufficient confirmations.
     * @dev Removes the owner, updates mappings, and emits an {OwnerRemoved} event.
     * @param _owner The address of the owner to be removed.
     * @param _txIndex The index of the transaction that triggered the removal.
     */
    function removeOwnerInternal(address _owner, uint256 _txIndex)
        internal
        onlyMultisigOwner
        txExists(_txIndex)
        isActive(_txIndex)
    {
        Transaction storage transaction = transactions[_txIndex];
        require(
            transaction.numConfirmations * 3 >= owners.length * 2,
            "MultisigWallet: insufficient confirmations to remove owner"
        );

        require(isOwner[_owner], "MultisigWallet: address is not an owner");

        require(owners.length > 1, "MultisigWallet: cannot remove the last owner");

        // Clear pending transactions before adding the new owner
        deactivatePendingTransactions();

        isOwner[_owner] = false;
        for (uint256 i = 0; i < owners.length; i++) {
            if (owners[i] == _owner) {
                owners[i] = owners[owners.length - 1];
                owners.pop();
                break;
            }
        }

        emit OwnerRemoved(_owner);
    }

    /**
     * @notice Submits a transaction to transfer ERC20 tokens.
     * @dev Encodes the ERC20 `transfer` function call and submits it as a transaction.
     * @param _token The ERC20 token contract.
     * @param _to The recipient address.
     * @param _amount The amount of tokens to transfer.
     */
    function transferERC20(IERC20 _token, address _to, uint256 _amount) public onlyMultisigOwner {
        require(address(_token) != address(0), "MultisigWallet: token address required");
        require(_to != address(0), "MultisigWallet: receiver address required");
        require(_amount > 0, "MultisigWallet: token amount required");
        // Encode the transfer data
        bytes memory data = abi.encodeWithSelector(_token.transfer.selector, _to, _amount);
        // Submit the transaction for confirmation
        submitTransaction(TransactionType.ERC20, address(_token), 0, data);
    }

    /**
     * @notice Submits a transaction to transfer ERC20 tokens using `transferFrom`.
     * @dev Encodes the ERC20 `transferFrom` function call and submits it as a transaction.
     * @param _token The ERC20 token contract.
     * @param _from The address from which tokens will be transferred.
     * @param _to The recipient address.
     * @param _amount The amount of tokens to transfer.
     */
    function transferFromERC20(IERC20 _token, address _from, address _to, uint256 _amount) public onlyMultisigOwner {
        require(address(_token) != address(0), "MultisigWallet: token address required");
        require(_from != address(0), "MultisigWallet: the token-owners address is required");
        require(_to != address(0), "MultisigWallet: receiver address required");
        require(_amount > 0, "MultisigWallet: token amount required");
        // Encode the transferFrom data
        bytes memory data = abi.encodeWithSelector(_token.transferFrom.selector, _from, _to, _amount);
        // Submit the transaction for confirmation
        submitTransaction(TransactionType.ERC20, address(_token), 0, data);
    }

    /**
     * @notice Submits a transaction to transfer an ERC721 token.
     * @dev Encodes the ERC721 `safeTransferFrom` function call and submits it as a transaction.
     * @param _token The ERC721 token contract.
     * @param _from The current owner of the token.
     * @param _to The recipient address.
     * @param _tokenId The ID of the token to transfer.
     */
    function safeTransferFromERC721(address _token, address _from, address _to, uint256 _tokenId)
        public
        onlyMultisigOwner
    {
        require(address(_token) != address(0), "MultisigWallet: token address required");
        require(_from != address(0), "MultisigWallet: the tokenowners address is required");
        require(_to != address(0), "MultisigWallet: receiver address required");
        // Encode the transferFrom data
        bytes memory data = abi.encodeWithSignature("safeTransferFrom(address,address,uint256)", _from, _to, _tokenId);
        submitTransaction(TransactionType.ERC721, _token, 0, data);
    }

    /**
     * @notice Submits a BulkTransfer transaction
     * @dev Encodes an array of BulkTransfer structs into the data payload
     * @param transfers Array of BulkTransfer structs representing the transfers
     */
    function batchTransfer(BatchTransaction[] memory transfers) public onlyMultisigOwner {
        bytes memory data = abi.encode(transfers);
        submitTransaction(TransactionType.BatchTransaction, address(this), 0, data);
    }

    /**
     * @notice Deactivates all pending (active) transactions.
     * @dev Iterates through all transactions and marks them as inactive.
     * Emits a {PendingTransactionsDeactivated} event upon completion.
     */
    function deactivatePendingTransactions() internal {
        uint256 length = transactions.length;
        for (uint256 i = 0; i < length;) {
            Transaction storage txn = transactions[i];
            if (txn.isActive) {
                txn.isActive = false;
            }
            unchecked {
                ++i;
            }
        }
        emit PendingTransactionsDeactivated();
    }

    /**
     * @notice Allows an owner to deactivate their own pending transaction.
     * @dev Marks the specified transaction as inactive if it was submitted by the caller.
     * @param _txIndex The index of the transaction to deactivate.
     */
    function deactivateMyPendingTransaction(uint256 _txIndex)
        public
        txExists(_txIndex)
        isActive(_txIndex)
        onlyMultisigOwner
    {
        require(
            transactions[_txIndex].owner == msg.sender,
            "MultisigWallet: only the owner can clear their submitted transaction"
        );

        // Deactivate Transaction
        transactions[_txIndex].isActive = false;

        emit DeactivatedMyPendingTransaction(_txIndex, msg.sender);
    }

    /**
     * @notice Checks if a transaction has received enough confirmations to be executed.
     * @dev The required number of confirmations varies based on the transaction type.
     * @param numConfirmations The current number of confirmations.
     * @param transactionType The type of the transaction.
     * @return True if the transaction has enough confirmations, false otherwise.
     */
    function hasEnoughConfirmations(uint64 numConfirmations, TransactionType transactionType)
        internal
        view
        returns (bool)
    {
        if (transactionType == TransactionType.AddOwner || transactionType == TransactionType.RemoveOwner) {
            // Important decisions require 2/3 or more confirmations
            return numConfirmations * 3 >= owners.length * 2;
        } else {
            // Normal decisions require more than 50% confirmations
            return numConfirmations * 2 > owners.length;
        }
    }

    /**
     * @notice Decodes the transaction data based on the transaction type.
     * @dev Extracts relevant parameters from the data payload for ERC20 and ERC721 transactions.
     * @param transactionType The type of the transaction.
     * @param data The data payload of the transaction.
     * @return to The recipient address extracted from the data.
     * @return amountOrTokenId The amount of tokens or token ID extracted from the data.
     */
    function decodeTransactionData(TransactionType transactionType, bytes memory data)
        internal
        pure
        returns (address to, uint256 amountOrTokenId)
    {
        if (transactionType == TransactionType.ERC20) {
            // ERC20 transfer(address recipient, uint256 amount)
            require(data.length == 68 || data.length == 100, "MultisigWallet: invalid data length for ERC20 transfer");

            // Use assembly to extract parameters directly
            if (data.length == 68) {
                // Handle ERC20 transfer(address to, uint256 amount)
                assembly {
                    // data points to the bytes array in memory
                    // Skip the first 32 bytes (length) and 4 bytes (selector)
                    let paramsOffset := add(data, 36)
                    to := mload(paramsOffset) // Load address (to) at data + 36
                    amountOrTokenId := mload(add(paramsOffset, 32)) // Load uint256 (amount) at data + 68
                }
                return (to, amountOrTokenId);
            } else if (data.length == 100) {
                // Handle ERC20 transferFrom(address from, address to, uint256 amount)
                assembly {
                    // Skip the first 32 bytes (length) and 4 bytes (selector)
                    let paramsOffset := add(data, 36)
                    // from is at data + 36, but we don't need to use it
                    let toAddr := mload(add(paramsOffset, 32)) // Load address (to) at data + 68
                    let amount := mload(add(paramsOffset, 64)) // Load uint256 (amount) at data + 100
                    to := toAddr
                    amountOrTokenId := amount
                }
                return (to, amountOrTokenId);
            }
        } else if (transactionType == TransactionType.ERC721) {
            // ERC721 safeTransferFrom(address from, address to, uint256 tokenId)
            require(data.length == 100, "MultisigWallet: invalid data length for ERC721 transfer");

            // Use assembly to extract parameters directly
            assembly {
                let paramsOffset := add(data, 36)
                // Skipping 'from' address (we don't need it for the return value)
                to := mload(add(paramsOffset, 32)) // Load address (to)
                amountOrTokenId := mload(add(paramsOffset, 64)) // Load uint256 (tokenId)
            }
            return (to, amountOrTokenId);
        } else {
            revert("MultisigWallet: unsupported transaction type for data decoding");
        }
    }

    /**
     * @notice Handles the receipt of an ERC721 token.
     * @dev This function is called whenever an ERC721 `safeTransfer` is performed to this contract.
     * It must return the function selector to confirm the token transfer.
     * If any other value is returned or the interface is not implemented, the transfer will be reverted.
     * @param operator The address which called `safeTransferFrom`.
     * @param from The address which previously owned the token.
     * @param tokenId The NFT identifier which is being transferred.
     * @param data Additional data with no specified format.
     * @return bytes4 Returns `IERC721Receiver.onERC721Received.selector` to confirm the token transfer.
     */
    function onERC721Received(address operator, address from, uint256 tokenId, bytes calldata data)
        external
        override
        returns (bytes4)
    {
        emit ERC721Received(operator, from, tokenId, data);
        return this.onERC721Received.selector;
    }

    /**
     * @notice Retrieves the total number of owners.
     * @return ownerCount The number of current owners in the multisig wallet.
     */
    function getOwnerCount() public view returns (uint256) {
        uint256 ownerCount = owners.length;
        return ownerCount;
    }

    /**
     * @notice Retrieves the list of all owners.
     * @return ownersList An array containing the addresses of all current owners.
     */
    function getOwners() public view returns (address[] memory) {
        return owners;
    }
}

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

pragma solidity ^0.8.20;

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

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

    uint256 private _status;

    /**
     * @dev Unauthorized reentrant call.
     */
    error ReentrancyGuardReentrantCall();

    constructor() {
        _status = NOT_ENTERED;
    }

    /**
     * @dev Prevents a contract from calling itself, directly or indirectly.
     * Calling a `nonReentrant` function from another `nonReentrant`
     * function is not supported. It is possible to prevent this from happening
     * by making the `nonReentrant` function external, and making it call a
     * `private` function that does the actual work.
     */
    modifier nonReentrant() {
        _nonReentrantBefore();
        _;
        _nonReentrantAfter();
    }

    function _nonReentrantBefore() private {
        // On the first call to nonReentrant, _status will be NOT_ENTERED
        if (_status == ENTERED) {
            revert ReentrancyGuardReentrantCall();
        }

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

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

    /**
     * @dev Returns true if the reentrancy guard is currently set to "entered", which indicates there is a
     * `nonReentrant` function in the call stack.
     */
    function _reentrancyGuardEntered() internal view returns (bool) {
        return _status == ENTERED;
    }
}

// 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/ERC721/IERC721.sol)

pragma solidity ^0.8.20;

import {IERC165} from "../../utils/introspection/IERC165.sol";

/**
 * @dev Required interface of an ERC721 compliant contract.
 */
interface IERC721 is IERC165 {
    /**
     * @dev Emitted when `tokenId` token is transferred from `from` to `to`.
     */
    event Transfer(address indexed from, address indexed to, uint256 indexed tokenId);

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

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

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

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

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

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

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

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

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

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (token/ERC721/IERC721Receiver.sol)

pragma solidity ^0.8.20;

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[EIP].
 *
 * Implementers can declare support of contract interfaces, which can then be
 * queried by others ({ERC165Checker}).
 *
 * For an implementation, see {ERC165}.
 */
interface IERC165 {
    /**
     * @dev Returns true if this contract implements the interface defined by
     * `interfaceId`. See the corresponding
     * https://eips.ethereum.org/EIPS/eip-165#how-interfaces-are-identified[EIP section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

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    "ds-test/=lib/openzeppelin-contracts/lib/forge-std/lib/ds-test/src/",
    "erc4626-tests/=lib/openzeppelin-contracts/lib/erc4626-tests/",
    "forge-std/=lib/forge-std/src/",
    "openzeppelin-contracts/=lib/openzeppelin-contracts/"
  ],
  "optimizer": {
    "enabled": true,
    "runs": 200
  },
  "metadata": {
    "useLiteralContent": false,
    "bytecodeHash": "ipfs",
    "appendCBOR": true
  },
  "outputSelection": {
    "*": {
      "*": [
        "evm.bytecode",
        "evm.deployedBytecode",
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        "userdoc",
        "metadata",
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      ]
    }
  },
  "evmVersion": "paris",
  "viaIR": false,
  "libraries": {}
}

• No Contract Security Audit Submitted- Submit Audit Here

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00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000003000000000000000000000000d5a4ed9d14bc273ce995b4e7e8fa0a21e59f8f3b000000000000000000000000bae2957b8c6cc7d39b7fdf5e82cf8c467b86be400000000000000000000000005a7c04218942c1c9baed35289a9b3edfed6f216f

-----Decoded View---------------
Arg [0] : _owners (address[]): 0xd5A4Ed9d14bc273ce995B4E7E8fa0a21E59F8F3b,0xBae2957B8c6CC7D39b7fDF5e82Cf8C467B86Be40,0x5a7c04218942c1c9baED35289A9b3eDfEd6F216F

-----Encoded View---------------
5 Constructor Arguments found :
Arg [0] : 0000000000000000000000000000000000000000000000000000000000000020
Arg [1] : 0000000000000000000000000000000000000000000000000000000000000003
Arg [2] : 000000000000000000000000d5a4ed9d14bc273ce995b4e7e8fa0a21e59f8f3b
Arg [3] : 000000000000000000000000bae2957b8c6cc7d39b7fdf5e82cf8c467b86be40
Arg [4] : 0000000000000000000000005a7c04218942c1c9baed35289a9b3edfed6f216f