Contract Source Code:

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (access/AccessControl.sol)

pragma solidity ^0.8.20;

import {IAccessControl} from "./IAccessControl.sol";
import {Context} from "../utils/Context.sol";
import {ERC165} from "../utils/introspection/ERC165.sol";

/**
 * @dev Contract module that allows children to implement role-based access
 * control mechanisms. This is a lightweight version that doesn't allow enumerating role
 * members except through off-chain means by accessing the contract event logs. Some
 * applications may benefit from on-chain enumerability, for those cases see
 * {AccessControlEnumerable}.
 *
 * Roles are referred to by their `bytes32` identifier. These should be exposed
 * in the external API and be unique. The best way to achieve this is by
 * using `public constant` hash digests:
 *
 * ```solidity
 * bytes32 public constant MY_ROLE = keccak256("MY_ROLE");
 * ```
 *
 * Roles can be used to represent a set of permissions. To restrict access to a
 * function call, use {hasRole}:
 *
 * ```solidity
 * function foo() public {
 *     require(hasRole(MY_ROLE, msg.sender));
 *     ...
 * }
 * ```
 *
 * Roles can be granted and revoked dynamically via the {grantRole} and
 * {revokeRole} functions. Each role has an associated admin role, and only
 * accounts that have a role's admin role can call {grantRole} and {revokeRole}.
 *
 * By default, the admin role for all roles is `DEFAULT_ADMIN_ROLE`, which means
 * that only accounts with this role will be able to grant or revoke other
 * roles. More complex role relationships can be created by using
 * {_setRoleAdmin}.
 *
 * WARNING: The `DEFAULT_ADMIN_ROLE` is also its own admin: it has permission to
 * grant and revoke this role. Extra precautions should be taken to secure
 * accounts that have been granted it. We recommend using {AccessControlDefaultAdminRules}
 * to enforce additional security measures for this role.
 */
abstract contract AccessControl is Context, IAccessControl, ERC165 {
    struct RoleData {
        mapping(address account => bool) hasRole;
        bytes32 adminRole;
    }

    mapping(bytes32 role => RoleData) private _roles;

    bytes32 public constant DEFAULT_ADMIN_ROLE = 0x00;

    /**
     * @dev Modifier that checks that an account has a specific role. Reverts
     * with an {AccessControlUnauthorizedAccount} error including the required role.
     */
    modifier onlyRole(bytes32 role) {
        _checkRole(role);
        _;
    }

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

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) public view virtual returns (bool) {
        return _roles[role].hasRole[account];
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `_msgSender()`
     * is missing `role`. Overriding this function changes the behavior of the {onlyRole} modifier.
     */
    function _checkRole(bytes32 role) internal view virtual {
        _checkRole(role, _msgSender());
    }

    /**
     * @dev Reverts with an {AccessControlUnauthorizedAccount} error if `account`
     * is missing `role`.
     */
    function _checkRole(bytes32 role, address account) internal view virtual {
        if (!hasRole(role, account)) {
            revert AccessControlUnauthorizedAccount(account, role);
        }
    }

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) public view virtual returns (bytes32) {
        return _roles[role].adminRole;
    }

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleGranted} event.
     */
    function grantRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _grantRole(role, account);
    }

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     *
     * May emit a {RoleRevoked} event.
     */
    function revokeRole(bytes32 role, address account) public virtual onlyRole(getRoleAdmin(role)) {
        _revokeRole(role, account);
    }

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been revoked `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     *
     * May emit a {RoleRevoked} event.
     */
    function renounceRole(bytes32 role, address callerConfirmation) public virtual {
        if (callerConfirmation != _msgSender()) {
            revert AccessControlBadConfirmation();
        }

        _revokeRole(role, callerConfirmation);
    }

    /**
     * @dev Sets `adminRole` as ``role``'s admin role.
     *
     * Emits a {RoleAdminChanged} event.
     */
    function _setRoleAdmin(bytes32 role, bytes32 adminRole) internal virtual {
        bytes32 previousAdminRole = getRoleAdmin(role);
        _roles[role].adminRole = adminRole;
        emit RoleAdminChanged(role, previousAdminRole, adminRole);
    }

    /**
     * @dev Attempts to grant `role` to `account` and returns a boolean indicating if `role` was granted.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleGranted} event.
     */
    function _grantRole(bytes32 role, address account) internal virtual returns (bool) {
        if (!hasRole(role, account)) {
            _roles[role].hasRole[account] = true;
            emit RoleGranted(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }

    /**
     * @dev Attempts to revoke `role` from `account` and returns a boolean indicating if `role` was revoked.
     *
     * Internal function without access restriction.
     *
     * May emit a {RoleRevoked} event.
     */
    function _revokeRole(bytes32 role, address account) internal virtual returns (bool) {
        if (hasRole(role, account)) {
            _roles[role].hasRole[account] = false;
            emit RoleRevoked(role, account, _msgSender());
            return true;
        } else {
            return false;
        }
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (access/IAccessControl.sol)

pragma solidity ^0.8.20;

/**
 * @dev External interface of AccessControl declared to support ERC-165 detection.
 */
interface IAccessControl {
    /**
     * @dev The `account` is missing a role.
     */
    error AccessControlUnauthorizedAccount(address account, bytes32 neededRole);

    /**
     * @dev The caller of a function is not the expected one.
     *
     * NOTE: Don't confuse with {AccessControlUnauthorizedAccount}.
     */
    error AccessControlBadConfirmation();

    /**
     * @dev Emitted when `newAdminRole` is set as ``role``'s admin role, replacing `previousAdminRole`
     *
     * `DEFAULT_ADMIN_ROLE` is the starting admin for all roles, despite
     * {RoleAdminChanged} not being emitted to signal this.
     */
    event RoleAdminChanged(bytes32 indexed role, bytes32 indexed previousAdminRole, bytes32 indexed newAdminRole);

    /**
     * @dev Emitted when `account` is granted `role`.
     *
     * `sender` is the account that originated the contract call. This account bears the admin role (for the granted role).
     * Expected in cases where the role was granted using the internal {AccessControl-_grantRole}.
     */
    event RoleGranted(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Emitted when `account` is revoked `role`.
     *
     * `sender` is the account that originated the contract call:
     *   - if using `revokeRole`, it is the admin role bearer
     *   - if using `renounceRole`, it is the role bearer (i.e. `account`)
     */
    event RoleRevoked(bytes32 indexed role, address indexed account, address indexed sender);

    /**
     * @dev Returns `true` if `account` has been granted `role`.
     */
    function hasRole(bytes32 role, address account) external view returns (bool);

    /**
     * @dev Returns the admin role that controls `role`. See {grantRole} and
     * {revokeRole}.
     *
     * To change a role's admin, use {AccessControl-_setRoleAdmin}.
     */
    function getRoleAdmin(bytes32 role) external view returns (bytes32);

    /**
     * @dev Grants `role` to `account`.
     *
     * If `account` had not been already granted `role`, emits a {RoleGranted}
     * event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function grantRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from `account`.
     *
     * If `account` had been granted `role`, emits a {RoleRevoked} event.
     *
     * Requirements:
     *
     * - the caller must have ``role``'s admin role.
     */
    function revokeRole(bytes32 role, address account) external;

    /**
     * @dev Revokes `role` from the calling account.
     *
     * Roles are often managed via {grantRole} and {revokeRole}: this function's
     * purpose is to provide a mechanism for accounts to lose their privileges
     * if they are compromised (such as when a trusted device is misplaced).
     *
     * If the calling account had been granted `role`, emits a {RoleRevoked}
     * event.
     *
     * Requirements:
     *
     * - the caller must be `callerConfirmation`.
     */
    function renounceRole(bytes32 role, address callerConfirmation) external;
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (interfaces/IERC1363.sol)

pragma solidity ^0.8.20;

import {IERC20} from "./IERC20.sol";
import {IERC165} from "./IERC165.sol";

/**
 * @title IERC1363
 * @dev Interface of the ERC-1363 standard as defined in the https://eips.ethereum.org/EIPS/eip-1363[ERC-1363].
 *
 * Defines an extension interface for ERC-20 tokens that supports executing code on a recipient contract
 * after `transfer` or `transferFrom`, or code on a spender contract after `approve`, in a single transaction.
 */
interface IERC1363 is IERC20, IERC165 {
    /*
     * Note: the ERC-165 identifier for this interface is 0xb0202a11.
     * 0xb0202a11 ===
     *   bytes4(keccak256('transferAndCall(address,uint256)')) ^
     *   bytes4(keccak256('transferAndCall(address,uint256,bytes)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256)')) ^
     *   bytes4(keccak256('transferFromAndCall(address,address,uint256,bytes)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256)')) ^
     *   bytes4(keccak256('approveAndCall(address,uint256,bytes)'))
     */

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from the caller's account to `to`
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferAndCall(address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value) external returns (bool);

    /**
     * @dev Moves a `value` amount of tokens from `from` to `to` using the allowance mechanism
     * and then calls {IERC1363Receiver-onTransferReceived} on `to`.
     * @param from The address which you want to send tokens from.
     * @param to The address which you want to transfer to.
     * @param value The amount of tokens to be transferred.
     * @param data Additional data with no specified format, sent in call to `to`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function transferFromAndCall(address from, address to, uint256 value, bytes calldata data) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value) external returns (bool);

    /**
     * @dev Sets a `value` amount of tokens as the allowance of `spender` over the
     * caller's tokens and then calls {IERC1363Spender-onApprovalReceived} on `spender`.
     * @param spender The address which will spend the funds.
     * @param value The amount of tokens to be spent.
     * @param data Additional data with no specified format, sent in call to `spender`.
     * @return A boolean value indicating whether the operation succeeded unless throwing.
     */
    function approveAndCall(address spender, uint256 value, bytes calldata data) external returns (bool);
}

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

pragma solidity ^0.8.20;

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

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

pragma solidity ^0.8.20;

import {IERC20} from "../token/ERC20/IERC20.sol";

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (token/ERC20/IERC20.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-20 standard as defined in the ERC.
 */
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 v5.3.0) (token/ERC20/utils/SafeERC20.sol)

pragma solidity ^0.8.20;

import {IERC20} from "../IERC20.sol";
import {IERC1363} from "../../../interfaces/IERC1363.sol";

/**
 * @title SafeERC20
 * @dev Wrappers around ERC-20 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 {
    /**
     * @dev An operation with an ERC-20 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 Variant of {safeTransfer} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransfer(IERC20 token, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(token, abi.encodeCall(token.transfer, (to, value)));
    }

    /**
     * @dev Variant of {safeTransferFrom} that returns a bool instead of reverting if the operation is not successful.
     */
    function trySafeTransferFrom(IERC20 token, address from, address to, uint256 value) internal returns (bool) {
        return _callOptionalReturnBool(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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * IMPORTANT: If the token implements ERC-7674 (ERC-20 with temporary allowance), and if the "client"
     * smart contract uses ERC-7674 to set temporary allowances, then the "client" smart contract should avoid using
     * this function. Performing a {safeIncreaseAllowance} or {safeDecreaseAllowance} operation on a token contract
     * that has a non-zero temporary allowance (for that particular owner-spender) will result in unexpected behavior.
     */
    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.
     *
     * NOTE: If the token implements ERC-7674, this function will not modify any temporary allowance. This function
     * only sets the "standard" allowance. Any temporary allowance will remain active, in addition to the value being
     * set here.
     */
    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 Performs an {ERC1363} transferAndCall, with a fallback to the simple {ERC20} transfer if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            safeTransfer(token, to, value);
        } else if (!token.transferAndCall(to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} transferFromAndCall, with a fallback to the simple {ERC20} transferFrom if the target
     * has no code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * Reverts if the returned value is other than `true`.
     */
    function transferFromAndCallRelaxed(
        IERC1363 token,
        address from,
        address to,
        uint256 value,
        bytes memory data
    ) internal {
        if (to.code.length == 0) {
            safeTransferFrom(token, from, to, value);
        } else if (!token.transferFromAndCall(from, to, value, data)) {
            revert SafeERC20FailedOperation(address(token));
        }
    }

    /**
     * @dev Performs an {ERC1363} approveAndCall, with a fallback to the simple {ERC20} approve if the target has no
     * code. This can be used to implement an {ERC721}-like safe transfer that rely on {ERC1363} checks when
     * targeting contracts.
     *
     * NOTE: When the recipient address (`to`) has no code (i.e. is an EOA), this function behaves as {forceApprove}.
     * Opposedly, when the recipient address (`to`) has code, this function only attempts to call {ERC1363-approveAndCall}
     * once without retrying, and relies on the returned value to be true.
     *
     * Reverts if the returned value is other than `true`.
     */
    function approveAndCallRelaxed(IERC1363 token, address to, uint256 value, bytes memory data) internal {
        if (to.code.length == 0) {
            forceApprove(token, to, value);
        } else if (!token.approveAndCall(to, value, data)) {
            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 {_callOptionalReturnBool} that reverts if call fails to meet the requirements.
     */
    function _callOptionalReturn(IERC20 token, bytes memory data) private {
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            let success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            // bubble errors
            if iszero(success) {
                let ptr := mload(0x40)
                returndatacopy(ptr, 0, returndatasize())
                revert(ptr, returndatasize())
            }
            returnSize := returndatasize()
            returnValue := mload(0)
        }

        if (returnSize == 0 ? address(token).code.length == 0 : returnValue != 1) {
            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 silently catches all reverts and returns a bool instead.
     */
    function _callOptionalReturnBool(IERC20 token, bytes memory data) private returns (bool) {
        bool success;
        uint256 returnSize;
        uint256 returnValue;
        assembly ("memory-safe") {
            success := call(gas(), token, 0, add(data, 0x20), mload(data), 0, 0x20)
            returnSize := returndatasize()
            returnValue := mload(0)
        }
        return success && (returnSize == 0 ? address(token).code.length > 0 : returnValue == 1);
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.0.1) (utils/Context.sol)

pragma solidity ^0.8.20;

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

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

    function _contextSuffixLength() internal view virtual returns (uint256) {
        return 0;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/ERC165.sol)

pragma solidity ^0.8.20;

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

/**
 * @dev Implementation of the {IERC165} interface.
 *
 * Contracts that want to implement ERC-165 should inherit from this contract and override {supportsInterface} to check
 * for the additional interface id that will be supported. For example:
 *
 * ```solidity
 * function supportsInterface(bytes4 interfaceId) public view virtual override returns (bool) {
 *     return interfaceId == type(MyInterface).interfaceId || super.supportsInterface(interfaceId);
 * }
 * ```
 */
abstract contract ERC165 is IERC165 {
    /**
     * @dev See {IERC165-supportsInterface}.
     */
    function supportsInterface(bytes4 interfaceId) public view virtual returns (bool) {
        return interfaceId == type(IERC165).interfaceId;
    }
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (utils/introspection/IERC165.sol)

pragma solidity ^0.8.20;

/**
 * @dev Interface of the ERC-165 standard, as defined in the
 * https://eips.ethereum.org/EIPS/eip-165[ERC].
 *
 * 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[ERC section]
     * to learn more about how these ids are created.
     *
     * This function call must use less than 30 000 gas.
     */
    function supportsInterface(bytes4 interfaceId) external view returns (bool);
}

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.3.0) (utils/Pausable.sol)

pragma solidity ^0.8.20;

import {Context} from "../utils/Context.sol";

/**
 * @dev Contract module which allows children to implement an emergency stop
 * mechanism that can be triggered by an authorized account.
 *
 * This module is used through inheritance. It will make available the
 * modifiers `whenNotPaused` and `whenPaused`, which can be applied to
 * the functions of your contract. Note that they will not be pausable by
 * simply including this module, only once the modifiers are put in place.
 */
abstract contract Pausable is Context {
    bool private _paused;

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

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

    /**
     * @dev The operation failed because the contract is paused.
     */
    error EnforcedPause();

    /**
     * @dev The operation failed because the contract is not paused.
     */
    error ExpectedPause();

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

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

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

    /**
     * @dev Throws if the contract is paused.
     */
    function _requireNotPaused() internal view virtual {
        if (paused()) {
            revert EnforcedPause();
        }
    }

    /**
     * @dev Throws if the contract is not paused.
     */
    function _requirePaused() internal view virtual {
        if (!paused()) {
            revert ExpectedPause();
        }
    }

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

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

// SPDX-License-Identifier: MIT
// OpenZeppelin Contracts (last updated v5.1.0) (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 EIP-1153 (transient storage) is available on the chain you're deploying at,
 * consider using {ReentrancyGuardTransient} instead.
 *
 * 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
pragma solidity 0.8.26;

import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";
import "@openzeppelin/contracts/utils/Pausable.sol";
import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";

//Router Interface
interface IUniswapV2Router {
    function swapExactTokensForTokens(
        uint amountIn,
        uint amountOutMin,
        address[] calldata path,
        address to,
        uint deadline
    ) external returns (uint[] memory amounts);
}

interface I1InchV6 {
    function swap(
        address executor,
        address srcToken,
        address dstToken,
        uint256 amount,
        uint256 minReturn,
        bytes calldata data
    ) external returns (uint256 returnAmount);
}

contract SecureArbitrageContractV4 is
    AccessControl,
    ReentrancyGuard,
    Pausable
{
    using SafeERC20 for IERC20;

    // ═══════════════════════════════════════════════════════════════════
    //                              ROLES & CONSTANTS
    // ═══════════════════════════════════════════════════════════════════
    bytes32 public constant BOT_ROLE = keccak256("BOT_ROLE");
    bytes32 public constant OPERATOR_ROLE = keccak256("OPERATOR_ROLE");

    uint256 public constant MAX_SLIPPAGE = 500; // 5%
    uint256 public constant MIN_PROFIT_BASIS_POINTS = 10; // 0.1%
    uint256 public constant MAX_TOKENS_PER_ARBITRAGE = 10;
    uint256 public constant DEFAULT_MAX_ALLOWANCE_USDC = 10000 * 1e6;
    uint256 public constant DEFAULT_MAX_TRADE_AMOUNT_USDC = 5000 * 1e6;

    // ═══════════════════════════════════════════════════════════════════
    //                              STRUCTS (OPTIMIZED)
    // ═══════════════════════════════════════════════════════════════════
    struct Config {
        uint256 minProfitThreshold;
        uint256 maxSlippage;
        uint256 maxGasPrice;
        uint256 maxTradeAmountUSDC;
        uint256 maxRouterAllowanceUSDC;
        bool emergencyMode;
        bool strictSelectorValidation; // New: toggle for selector validation
    }

    struct TradeState {
        bool inTrade;
        uint256 tradeStartTime;
        address initiator;
        uint256 nonce;
    }

    struct AssetInfo {
        uint256 maxTradeAmount;
        bool isActive;
        uint8 decimals;
        bytes32 symbolHash;
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              STATE VARIABLES
    // ═══════════════════════════════════════════════════════════════════
    Config public config;
    TradeState public tradeState;
    uint256 public totalProfit;
    uint256 public totalTrades;
    uint8 public deploymentCount;

    // Selector validation
    mapping(bytes4 => bool) public validSelectors;
    mapping(bytes4 => string) public selectorNames;
    bytes4[] public allSelectors;

    // Simplified mappings (removed multi-sig related)
    mapping(address => bool) public activeBots;
    mapping(address => bool) public approvedRouters;
    mapping(address => AssetInfo) public assetConfigs;
    mapping(address => bool) public approvedTokens;

    // Arrays for enumeration
    address[] public allBots;
    address[] public allRouters;
    address[] public allTokens;

    // ═══════════════════════════════════════════════════════════════════
    //                              EVENTS
    // ═══════════════════════════════════════════════════════════════════
    event ArbitrageExecuted(
        address indexed tokenIn,
        address indexed tokenOut,
        uint256 amountIn,
        uint256 profit,
        address indexed routerUsed,
        address executor
    );
    
    event AssetUpdated(address indexed asset, uint256 maxTrade, bool isActive, string assetType);
    event BotUpdated(address indexed bot, bool isActive);
    event SelectorUpdated(bytes4 indexed selector, bool isValid, string name);
    event Withdrawal(address indexed token, uint256 amount, address indexed recipient);

    // ═══════════════════════════════════════════════════════════════════
    //                              MODIFIERS
    // ═══════════════════════════════════════════════════════════════════
    modifier onlyActiveBot() {
        require(hasRole(BOT_ROLE, msg.sender) && activeBots[msg.sender], "Not active bot");
        _;
    }

    modifier validAsset(address asset, bool isToken) {
        if (isToken) {
            require(approvedTokens[asset] && assetConfigs[asset].isActive, "Invalid token");
        } else {
            require(approvedRouters[asset] && assetConfigs[asset].isActive, "Invalid router");
        }
        _;
    }

    modifier notInTrade() {
        require(!tradeState.inTrade, "Trade in progress");
        _;
    }

    modifier gasLimit() {
        require(tx.gasprice <= config.maxGasPrice, "Gas price too high");
        _;
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              CONSTRUCTOR
    // ═══════════════════════════════════════════════════════════════════
    constructor(
        address _admin,
        address _operator,
        uint256 _minProfitThreshold,
        address[] memory _botAddresses
    ) {
        require(_admin != address(0) && _operator != address(0), "Invalid addresses");
        
        _grantRole(DEFAULT_ADMIN_ROLE, _admin);
        _grantRole(OPERATOR_ROLE, _operator);

        config = Config({
            minProfitThreshold: _minProfitThreshold,
            maxSlippage: 300,
            maxGasPrice: 100 gwei,
            maxTradeAmountUSDC: DEFAULT_MAX_TRADE_AMOUNT_USDC,
            maxRouterAllowanceUSDC: DEFAULT_MAX_ALLOWANCE_USDC,
            emergencyMode: false,
            strictSelectorValidation: true // Enable by default
        });

        tradeState.nonce = 1;
        deploymentCount++;

        _initializeDefaults();
        _initializeBots(_botAddresses);
        _initializeSelectors();
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              CORE ARBITRAGE FUNCTIONS
    // ═══════════════════════════════════════════════════════════════════
    function executeArbitrage(
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        address targetRouter,
        bytes memory swapData,
        uint256 minReturn
    )
        external
        payable
        onlyActiveBot
        nonReentrant
        whenNotPaused
        notInTrade
        validAsset(targetRouter, false)
        validAsset(tokenIn, true)
        validAsset(tokenOut, true)
        gasLimit
    {
        require(amountIn > 0 && amountIn <= assetConfigs[tokenIn].maxTradeAmount, "Invalid amount");
        require(amountIn <= assetConfigs[targetRouter].maxTradeAmount, "Exceeds router limit");
        
        _startTrade();
        
        // Validate swap data if strict validation is enabled
        if (config.strictSelectorValidation) {
            _validateSwapData(tokenIn, tokenOut, amountIn, minReturn, targetRouter, swapData);
        }
        
        uint256 beforeBal = IERC20(tokenOut).balanceOf(address(this));
        _executeSwap(targetRouter, swapData);
        uint256 afterBal = IERC20(tokenOut).balanceOf(address(this));
        
        require(afterBal >= minReturn, "Insufficient return");
        
        uint256 profit = afterBal > beforeBal ? afterBal - beforeBal : 0;
        if (profit >= config.minProfitThreshold) totalProfit += profit;
        totalTrades++;
        
        emit ArbitrageExecuted(tokenIn, tokenOut, amountIn, profit, targetRouter, msg.sender);
        _endTrade();
    }

    function executeMultiArbitrage(
        address[] calldata tokens,
        uint256 amountIn,
        address[] calldata routers,
        bytes[] calldata datas,
        uint256 minReturn
    )
        external
        payable
        onlyActiveBot
        nonReentrant
        whenNotPaused
        notInTrade
        gasLimit
    {
        require(tokens.length >= 3 && tokens.length <= MAX_TOKENS_PER_ARBITRAGE, "Invalid tokens length");
        require(routers.length == tokens.length - 1 && datas.length == routers.length, "Mismatched arrays");
        require(amountIn <= assetConfigs[tokens[0]].maxTradeAmount, "Amount exceeds limit");

        // Validate all assets
        for (uint i = 0; i < tokens.length; i++) {
            require(approvedTokens[tokens[i]] && assetConfigs[tokens[i]].isActive, "Invalid token");
        }
        for (uint i = 0; i < routers.length; i++) {
            require(approvedRouters[routers[i]] && assetConfigs[routers[i]].isActive, "Invalid router");
        }

        _startTrade();
        
        uint256 beforeBal = IERC20(tokens[0]).balanceOf(address(this));
        uint256 currentAmount = amountIn;

        for (uint i = 0; i < routers.length; i++) {
            if (i > 0) {
                currentAmount = IERC20(tokens[i]).balanceOf(address(this));
            }

            bytes memory modifiedData = _updateSwapAmount(datas[i], currentAmount);

            // Validate if strict validation is enabled
            if (config.strictSelectorValidation) {
                _validateSwapData(
                    tokens[i],
                    tokens[i + 1],
                    currentAmount,
                    0,
                    routers[i],
                    modifiedData
                );
            }

            _executeSwap(routers[i], modifiedData);
        }

        uint256 afterBal = IERC20(tokens[0]).balanceOf(address(this));
        require(afterBal >= minReturn, "Insufficient return");

        uint256 profit = afterBal > beforeBal ? afterBal - beforeBal : 0;
        if (profit >= config.minProfitThreshold) totalProfit += profit;
        totalTrades++;

        emit ArbitrageExecuted(tokens[0], tokens[0], amountIn, profit, address(0), msg.sender);
        _endTrade();
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              INTERNAL HELPER FUNCTIONS
    // ═══════════════════════════════════════════════════════════════════
    function _validateSwapData(
        address tokenIn,
        address tokenOut,
        uint256 amountIn,
        uint256 minReturn,
        address router,
        bytes memory data
    ) internal view {
        require(data.length >= 4, "Invalid data length");
        
        bytes4 sig;
        assembly {
            sig := mload(add(data, 32))
        }

        // Check if selector is valid (if strict validation is enabled)
        require(validSelectors[sig], "Invalid function selector");

        // Basic validation based on known selectors
        if (sig == 0x38ed1739) { // uniswap_swapExactTokensForTokens
            (
                uint256 inAmt,
                uint256 outMin,
                address[] memory path,
                address to,
                uint256 deadline
            ) = abi.decode(
                    sliceBytes(data, 4, data.length - 4),
                    (uint256, uint256, address[], address, uint256)
                );

            require(path.length >= 2, "Invalid path length");
            require(path[0] == tokenIn && path[path.length - 1] == tokenOut, "Invalid path");
            require(to == address(this), "Invalid recipient");
            require(inAmt == amountIn, "Wrong amountIn");
            require(deadline > block.timestamp, "Expired deadline");
            
            if (minReturn > 0) {
                require(outMin >= minReturn, "Insufficient minReturn");
            }
        }
        // Add more specific validations for other selectors as needed
    }

    function sliceBytes(bytes memory data, uint256 start, uint256 length) internal pure returns (bytes memory) {
        require(data.length >= start + length, "sliceBytes: out of bounds");
        bytes memory result = new bytes(length);
        for (uint256 i = 0; i < length; i++) {
            result[i] = data[start + i];
        }
        return result;
    }

    function _updateSwapAmount(bytes memory data, uint256 newAmountIn) internal pure returns (bytes memory) {
        require(data.length >= 4, "Invalid swap data");

        bytes4 sig;
        assembly {
            sig := mload(add(data, 32))
        }

        // Handle different selectors
        if (sig == 0x38ed1739) { // uniswap_swapExactTokensForTokens
            (
                ,
                uint256 outMin,
                address[] memory path,
                address to,
                uint256 deadline
            ) = abi.decode(sliceBytes(data, 4, data.length - 4), (uint256, uint256, address[], address, uint256));

            return abi.encodeWithSelector(sig, newAmountIn, outMin, path, to, deadline);
        }
        else if (sig == 0x12aa3caf || sig == 0x7c025200) { // 1inch swap variants
            // Generic handling for 1inch - you may need to adjust based on specific function
            (
                address executor,
                address src,
                address dst,
                ,
                uint256 minReturn,
                bytes memory swapData
            ) = abi.decode(sliceBytes(data, 4, data.length - 4), (address, address, address, uint256, uint256, bytes));

            return abi.encodeWithSelector(sig, executor, src, dst, newAmountIn, minReturn, swapData);
        }

        // For unknown selectors, return original data (fallback)
        return data;
    }

    function _executeSwap(address router, bytes memory data) internal {
        (bool success, ) = router.call{value: msg.value}(data);
        require(success, "Swap failed");
    }

    function _startTrade() internal {
        tradeState = TradeState({
            inTrade: true,
            tradeStartTime: block.timestamp,
            initiator: msg.sender,
            nonce: tradeState.nonce + 1
        });
    }

    function _endTrade() internal {
        tradeState.inTrade = false;
        tradeState.tradeStartTime = 0;
        tradeState.initiator = address(0);
    }

    function _initializeDefaults() internal {
        // Default routers
        address[3] memory defaultRouters = [
            0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D, // Uniswap V2
            0xd9e1cE17f2641f24aE83637ab66a2cca9C378B9F, // SushiSwap
            0x111111125421cA6dc452d289314280a0f8842A65  // 1inch V6
        ];
        
        for (uint i = 0; i < defaultRouters.length; i++) {
            approvedRouters[defaultRouters[i]] = true;
            assetConfigs[defaultRouters[i]] = AssetInfo({
                maxTradeAmount: DEFAULT_MAX_TRADE_AMOUNT_USDC,
                isActive: true,
                decimals: 18,
                symbolHash: keccak256(abi.encodePacked("ROUTER_", i))
            });
            allRouters.push(defaultRouters[i]);
        }
        
        // Default tokens
        address[8] memory defaultTokens = [
            0xA0b86991c6218b36c1d19D4a2e9Eb0cE3606eB48, // USDC
            0xdAC17F958D2ee523a2206206994597C13D831ec7, // USDT
            0x6B175474E89094C44Da98b954EedeAC495271d0F,  // DAI
            0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2, // WETH
            0x7f39C581F595B53c5cb19bD0b3f8dA6c935E2Ca0, // wstETH
            0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599, // WBTC
            0x5A98FcBEA516Cf06857215779Fd812CA3beF1B32, // LDO
            0x514910771AF9Ca656af840dff83E8264EcF986CA  // LINK
        ];
        uint8[8] memory decimals = [6, 6, 18, 18, 18, 8, 18, 18];
        uint256[8] memory maxTrades = [
            uint256(10000 * 1e6),
            uint256(10000 * 1e6),
            uint256(10000 * 1e18),
            uint256(10 * 1e18),
            uint256(10 * 1e18),
            uint256(1 * 1e8),
            uint256(100000 * 1e18),
            uint256(1000 * 1e18)
        ];
        
        for (uint i = 0; i < defaultTokens.length; i++) {
            approvedTokens[defaultTokens[i]] = true;
            assetConfigs[defaultTokens[i]] = AssetInfo({
                maxTradeAmount: maxTrades[i],
                isActive: true,
                decimals: decimals[i],
                symbolHash: keccak256(abi.encodePacked("TOKEN_", i))
            });
            allTokens.push(defaultTokens[i]);
        }
    }

    function _initializeBots(address[] memory _botAddresses) internal {
        for (uint i = 0; i < _botAddresses.length; i++) {
            require(_botAddresses[i] != address(0), "Invalid bot");
            _grantRole(BOT_ROLE, _botAddresses[i]);
            activeBots[_botAddresses[i]] = true;
            allBots.push(_botAddresses[i]);
            emit BotUpdated(_botAddresses[i], true);
        }
    }

    function _initializeSelectors() internal {
        // Initialize with your provided selectors
        bytes4[9] memory selectors = [
            bytes4(0x12aa3caf), // 1inch_swap
            bytes4(0xe449022e), // 1inch_uniswapV3Swap
            bytes4(0x2e95b6c8), // 1inch_unoswap
            bytes4(0x84bd6d29), // 1inch_clipperSwap
            bytes4(0x7c025200), // 1inch_swap_v2
            bytes4(0x0502b1c5), // 1inch_fillOrderRFQ
            bytes4(0x38ed1739), // uniswap_swapExactTokensForTokens
            bytes4(0x8803dbee), // uniswap_swapTokensForExactTokens
            bytes4(0x2195995c)  // Additional selector if needed
        ];
        
        string[9] memory names = [
            "1inch_swap",
            "1inch_uniswapV3Swap", 
            "1inch_unoswap",
            "1inch_clipperSwap",
            "1inch_swap_v2",
            "1inch_fillOrderRFQ",
            "uniswap_swapExactTokensForTokens",
            "uniswap_swapTokensForExactTokens",
            "additional_selector"
        ];
        
        for (uint i = 0; i < selectors.length; i++) {
            if (selectors[i] != bytes4(0)) {
                validSelectors[selectors[i]] = true;
                selectorNames[selectors[i]] = names[i];
                allSelectors.push(selectors[i]);
            }
        }
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              ADMIN FUNCTIONS (SIMPLIFIED)
    // ═══════════════════════════════════════════════════════════════════
    
    // Withdrawal function that works for both ETH and ERC20 tokens
    function withdraw(address token, uint256 amount) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (token == address(0)) {
            // ETH withdrawal
            require(address(this).balance >= amount, "Insufficient ETH balance");
            (bool success, ) = msg.sender.call{value: amount}("");
            require(success, "ETH transfer failed");
        } else {
            // ERC20 token withdrawal
            require(IERC20(token).balanceOf(address(this)) >= amount, "Insufficient token balance");
            IERC20(token).safeTransfer(msg.sender, amount);
        }
        emit Withdrawal(token, amount, msg.sender);
    }

    // Emergency withdrawal (all balance)
    function emergencyWithdraw(address token) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (token == address(0)) {
            uint256 balance = address(this).balance;
            (bool success, ) = msg.sender.call{value: balance}("");
            require(success, "ETH transfer failed");
            emit Withdrawal(token, balance, msg.sender);
        } else {
            uint256 balance = IERC20(token).balanceOf(address(this));
            IERC20(token).safeTransfer(msg.sender, balance);
            emit Withdrawal(token, balance, msg.sender);
        }
    }

    // Selector management functions
    function addSelector(bytes4 selector, string memory name) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(!validSelectors[selector], "Selector already exists");
        validSelectors[selector] = true;
        selectorNames[selector] = name;
        allSelectors.push(selector);
        emit SelectorUpdated(selector, true, name);
    }

    function removeSelector(bytes4 selector) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(validSelectors[selector], "Selector doesn't exist");
        validSelectors[selector] = false;
        selectorNames[selector] = "";
        
        // Remove from array
        for (uint i = 0; i < allSelectors.length; i++) {
            if (allSelectors[i] == selector) {
                allSelectors[i] = allSelectors[allSelectors.length - 1];
                allSelectors.pop();
                break;
            }
        }
        emit SelectorUpdated(selector, false, "");
    }

    // Toggle strict selector validation
    function toggleSelectorValidation(bool enabled) external onlyRole(DEFAULT_ADMIN_ROLE) {
        config.strictSelectorValidation = enabled;
    }

    // Asset management
    function addToken(address token, uint256 maxTradeAmount, uint8 decimals) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(token != address(0), "Invalid token address");
        require(!approvedTokens[token], "Token already exists");
        
        approvedTokens[token] = true;
        assetConfigs[token] = AssetInfo({
            maxTradeAmount: maxTradeAmount,
            isActive: true,
            decimals: decimals,
            symbolHash: keccak256(abi.encodePacked("TOKEN_", allTokens.length))
        });
        allTokens.push(token);
        emit AssetUpdated(token, maxTradeAmount, true, "TOKEN");
    }

    function addRouter(address router, uint256 maxTradeAmount) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(router != address(0), "Invalid router address");
        require(!approvedRouters[router], "Router already exists");
        
        approvedRouters[router] = true;
        assetConfigs[router] = AssetInfo({
            maxTradeAmount: maxTradeAmount,
            isActive: true,
            decimals: 18,
            symbolHash: keccak256(abi.encodePacked("ROUTER_", allRouters.length))
        });
        allRouters.push(router);
        emit AssetUpdated(router, maxTradeAmount, true, "ROUTER");
    }

    function updateAsset(address asset, uint256 maxTradeAmount, bool isActive) external onlyRole(DEFAULT_ADMIN_ROLE) {
        require(approvedTokens[asset] || approvedRouters[asset], "Asset not found");
        assetConfigs[asset].maxTradeAmount = maxTradeAmount;
        assetConfigs[asset].isActive = isActive;
        emit AssetUpdated(asset, maxTradeAmount, isActive, approvedTokens[asset] ? "TOKEN" : "ROUTER");
    }

    function updateBot(address bot, bool isActive) external onlyRole(DEFAULT_ADMIN_ROLE) {
        if (isActive && !hasRole(BOT_ROLE, bot)) {
            _grantRole(BOT_ROLE, bot);
            allBots.push(bot);
        } else if (!isActive && hasRole(BOT_ROLE, bot)) {
            _revokeRole(BOT_ROLE, bot);
        }
        
        activeBots[bot] = isActive;
        emit BotUpdated(bot, isActive);
    }

    function approveToken(address token, address spender, uint256 amount) external onlyRole(OPERATOR_ROLE) {
        IERC20(token).safeIncreaseAllowance(spender, amount);
    }

    function pause() external onlyRole(OPERATOR_ROLE) { _pause(); }
    function unpause() external onlyRole(DEFAULT_ADMIN_ROLE) { _unpause(); }
    
    function forceUnlockTrade() external onlyRole(DEFAULT_ADMIN_ROLE) {
        tradeState.inTrade = false;
        tradeState.tradeStartTime = 0;
        tradeState.initiator = address(0);
    }

    // ═══════════════════════════════════════════════════════════════════
    //                              VIEW FUNCTIONS
    // ═══════════════════════════════════════════════════════════════════
    function getAllBots() external view returns (address[] memory) { return allBots; }
    function getAllRouters() external view returns (address[] memory) { return allRouters; }
    function getAllTokens() external view returns (address[] memory) { return allTokens; }
    function getAllSelectors() external view returns (bytes4[] memory) { return allSelectors; }
    function getSelectorName(bytes4 selector) external view returns (string memory) { return selectorNames[selector]; }
    function isValidSelector(bytes4 selector) external view returns (bool) { return validSelectors[selector]; }

    // ═══════════════════════════════════════════════════════════════════
    //                              RECEIVE
    // ═══════════════════════════════════════════════════════════════════
    receive() external payable {}
    fallback() external payable {}
}