abstract contract BaseAdapter {
    using AddressArrayUtils for address[];

    /* ============ Events ============ */

    event CallerStatusUpdated(address indexed _caller, bool _status);
    event AnyoneCallableUpdated(bool indexed _status);

    /* ============ Modifiers ============ */

    /**
     * Throws if the sender is not the SetToken operator
     */
    modifier onlyOperator() {
        require(msg.sender == manager.operator(), "Must be operator");
        _;
    }

    /**
     * Throws if the sender is not the SetToken methodologist
     */
    modifier onlyMethodologist() {
        require(msg.sender == manager.methodologist(), "Must be methodologist");
        _;
    }

    /**
     * Throws if caller is a contract, can be used to stop flash loan and sandwich attacks
     */
    modifier onlyEOA() {
        require(msg.sender == tx.origin, "Caller must be EOA Address");
        _;
    }

    /**
     * Throws if not allowed caller
     */
    modifier onlyAllowedCaller(address _caller) {
        require(isAllowedCaller(_caller), "Address not permitted to call");
        _;
    }

    /* ============ State Variables ============ */

    // Instance of manager contract
    IBaseManager public manager;

    // Boolean indicating if anyone can call function
    bool public anyoneCallable;

    // Mapping of addresses allowed to call function
    mapping(address => bool) public callAllowList;

    /* ============ Constructor ============ */

    constructor(IBaseManager _manager) public { manager = _manager; }

    /* ============ External Functions ============ */

    /**
     * OPERATOR ONLY: Toggle ability for passed addresses to call only allowed caller functions
     *
     * @param _callers           Array of caller addresses to toggle status
     * @param _statuses          Array of statuses for each caller
     */
    function updateCallerStatus(address[] calldata _callers, bool[] calldata _statuses) external onlyOperator {
        require(_callers.length == _statuses.length, "Array length mismatch");
        require(_callers.length > 0, "Array length must be > 0");
        require(!_callers.hasDuplicate(), "Cannot duplicate callers");

        for (uint256 i = 0; i < _callers.length; i++) {
            address caller = _callers[i];
            bool status = _statuses[i];
            callAllowList[caller] = status;
            emit CallerStatusUpdated(caller, status);
        }
    }

    /**
     * OPERATOR ONLY: Toggle whether anyone can call function, bypassing the callAllowlist 
     *
     * @param _status           Boolean indicating whether to allow anyone call
     */
    function updateAnyoneCallable(bool _status) external onlyOperator {
        anyoneCallable = _status;
        emit AnyoneCallableUpdated(_status);
    }

    /* ============ Internal Functions ============ */
    
    /**
     * Invoke manager to transfer tokens from manager to other contract.
     *
     * @param _token           Token being transferred from manager contract
     * @param _amount          Amount of token being transferred
     */
    function invokeManagerTransfer(address _token, address _destination, uint256 _amount) internal {
        bytes memory callData = abi.encodeWithSignature("transfer(address,uint256)", _destination, _amount);
        invokeManager(_token, callData);
    }

    /**
     * Invoke call from manager
     *
     * @param _module           Module to interact with
     * @param _encoded          Encoded byte data
     */
    function invokeManager(address _module, bytes memory _encoded) internal {
        manager.interactManager(_module, _encoded);
    }

    /**
     * Determine if passed address is allowed to call function. If anyoneCallable set to true anyone can call otherwise needs to be approved.
     *
     * return bool              Boolean indicating if allowed caller
     */
    function isAllowedCaller(address _caller) internal view virtual returns (bool) {
        return anyoneCallable || callAllowList[_caller];
    }
}
/**
 * @title BaseAdapter
 * @author Set Protocol
 *
 * Abstract class that houses common adapter-related state and functions.
 */
function isAllowedCaller(address _caller) internal view virtual returns (bool) {
    return anyoneCallable || callAllowList[_caller];
}

/**
 * Determine if passed address is allowed to call function. If anyoneCallable set to true anyone can call otherwise needs to be approved.
 *
 * return bool              Boolean indicating if allowed caller
 */