// SPDX-License-Identifier: MIT OR Apache-2.0
pragma solidity >=0.8.0;

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// ============ Internal Imports ============
import {Enrollment, EnrollmentStatus, EnumerableMapEnrollment} from "../libs/EnumerableMapEnrollment.sol";
import {IAVSDirectory} from "../interfaces/avs/vendored/IAVSDirectory.sol";
import {IRemoteChallenger} from "../interfaces/avs/IRemoteChallenger.sol";
import {ISlasher} from "../interfaces/avs/vendored/ISlasher.sol";
import {ECDSAServiceManagerBase} from "./ECDSAServiceManagerBase.sol";

contract HyperlaneServiceManager is ECDSAServiceManagerBase {
    // ============ Libraries ============

    using EnumerableMapEnrollment for EnumerableMapEnrollment.AddressToEnrollmentMap;

    // ============ Public Storage ============

    // Slasher contract responsible for slashing operators
    // @dev slasher needs to be updated once slashing is implemented
    ISlasher internal slasher;

    // ============ Events ============

    /**
     * @notice Emitted when an operator is enrolled in a challenger
     * @param operator The address of the operator
     * @param challenger The address of the challenger
     */
    event OperatorEnrolledToChallenger(
        address operator,
        IRemoteChallenger challenger
    );

    /**
     * @notice Emitted when an operator is queued for unenrollment from a challenger
     * @param operator The address of the operator
     * @param challenger The address of the challenger
     * @param unenrollmentStartBlock The block number at which the unenrollment was queued
     * @param challengeDelayBlocks The number of blocks to wait before unenrollment is complete
     */
    event OperatorQueuedUnenrollmentFromChallenger(
        address operator,
        IRemoteChallenger challenger,
        uint256 unenrollmentStartBlock,
        uint256 challengeDelayBlocks
    );

    /**
     * @notice Emitted when an operator is unenrolled from a challenger
     * @param operator The address of the operator
     * @param challenger The address of the challenger
     * @param unenrollmentEndBlock The block number at which the unenrollment was completed
     */
    event OperatorUnenrolledFromChallenger(
        address operator,
        IRemoteChallenger challenger,
        uint256 unenrollmentEndBlock
    );

    // ============ Internal Storage ============

    // Mapping of operators to challengers they are enrolled in (enumerable required for remove-all)
    mapping(address => EnumerableMapEnrollment.AddressToEnrollmentMap)
        internal enrolledChallengers;

    // ============ Modifiers ============

    // Only allows the challenger the operator is enrolled in to call the function
    modifier onlyEnrolledChallenger(address operator) {
        (bool exists, ) = enrolledChallengers[operator].tryGet(msg.sender);
        require(
            exists,
            "HyperlaneServiceManager: Operator not enrolled in challenger"
        );
        _;
    }

    // ============ Constructor ============

    constructor(
        address _avsDirectory,
        address _stakeRegistry,
        address _paymentCoordinator,
        address _delegationManager
    )
        ECDSAServiceManagerBase(
            _avsDirectory,
            _stakeRegistry,
            _paymentCoordinator,
            _delegationManager
        )
    {}

    /**
     * @notice Initializes the HyperlaneServiceManager contract with the owner address
     */
    function initialize(address _owner) public initializer {
        __ServiceManagerBase_init(_owner);
    }

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

    /**
     * @notice Enrolls as an operator into a list of challengers
     * @param _challengers The list of challengers to enroll into
     */
    function enrollIntoChallengers(
        IRemoteChallenger[] memory _challengers
    ) external {
        for (uint256 i = 0; i < _challengers.length; i++) {
            enrollIntoChallenger(_challengers[i]);
        }
    }

    /**
     * @notice starts an operator for unenrollment from a list of challengers
     * @param _challengers The list of challengers to unenroll from
     */
    function startUnenrollment(
        IRemoteChallenger[] memory _challengers
    ) external {
        for (uint256 i = 0; i < _challengers.length; i++) {
            startUnenrollment(_challengers[i]);
        }
    }

    /**
     * @notice Completes the unenrollment of an operator from a list of challengers
     * @param _challengers The list of challengers to unenroll from
     */
    function completeUnenrollment(address[] memory _challengers) external {
        _completeUnenrollment(msg.sender, _challengers);
    }

    /**
     * @notice Sets the slasher contract responsible for slashing operators
     * @param _slasher The address of the slasher contract
     */
    function setSlasher(ISlasher _slasher) external onlyOwner {
        slasher = _slasher;
    }

    /**
     * @notice returns the status of a challenger an operator is enrolled in
     * @param _operator The address of the operator
     * @param _challenger specified IRemoteChallenger contract
     */
    function getChallengerEnrollment(
        address _operator,
        IRemoteChallenger _challenger
    ) external view returns (Enrollment memory enrollment) {
        return enrolledChallengers[_operator].get(address(_challenger));
    }

    /**
     * @notice forwards a call to the Slasher contract to freeze an operator
     * @param operator The address of the operator to freeze.
     * @dev only the enrolled challengers can call this function
     */
    function freezeOperator(
        address operator
    ) external virtual onlyEnrolledChallenger(operator) {
        slasher.freezeOperator(operator);
    }

    // ============ Public Functions ============

    /**
     * @notice returns the list of challengers an operator is enrolled in
     * @param _operator The address of the operator
     */
    function getOperatorChallengers(
        address _operator
    ) public view returns (address[] memory) {
        return enrolledChallengers[_operator].keys();
    }

    /**
     * @notice Enrolls as an operator into a single challenger
     * @param challenger The challenger to enroll into
     */
    function enrollIntoChallenger(IRemoteChallenger challenger) public {
        require(
            enrolledChallengers[msg.sender].set(
                address(challenger),
                Enrollment(EnrollmentStatus.ENROLLED, 0)
            )
        );
        emit OperatorEnrolledToChallenger(msg.sender, challenger);
    }

    /**
     * @notice starts an operator for unenrollment from a challenger
     * @param challenger The challenger to unenroll from
     */
    function startUnenrollment(IRemoteChallenger challenger) public {
        (bool exists, Enrollment memory enrollment) = enrolledChallengers[
            msg.sender
        ].tryGet(address(challenger));
        require(
            exists && enrollment.status == EnrollmentStatus.ENROLLED,
            "HyperlaneServiceManager: challenger isn't enrolled"
        );

        enrolledChallengers[msg.sender].set(
            address(challenger),
            Enrollment(
                EnrollmentStatus.PENDING_UNENROLLMENT,
                uint248(block.number)
            )
        );
        emit OperatorQueuedUnenrollmentFromChallenger(
            msg.sender,
            challenger,
            block.number,
            challenger.challengeDelayBlocks()
        );
    }

    /**
     * @notice Completes the unenrollment of an operator from a challenger
     * @param challenger The challenger to unenroll from
     */
    function completeUnenrollment(address challenger) public {
        _completeUnenrollment(msg.sender, challenger);
    }

    // ============ Internal Functions ============

    /**
     * @notice Completes the unenrollment of an operator from a list of challengers
     * @param operator The address of the operator
     * @param _challengers The list of challengers to unenroll from
     */
    function _completeUnenrollment(
        address operator,
        address[] memory _challengers
    ) internal {
        for (uint256 i = 0; i < _challengers.length; i++) {
            _completeUnenrollment(operator, _challengers[i]);
        }
    }

    /**
     * @notice Completes the unenrollment of an operator from a challenger
     * @param operator The address of the operator
     * @param _challenger The challenger to unenroll from
     */
    function _completeUnenrollment(
        address operator,
        address _challenger
    ) internal {
        IRemoteChallenger challenger = IRemoteChallenger(_challenger);
        (bool exists, Enrollment memory enrollment) = enrolledChallengers[
            operator
        ].tryGet(address(challenger));

        require(
            exists &&
                enrollment.status == EnrollmentStatus.PENDING_UNENROLLMENT &&
                block.number >=
                enrollment.unenrollmentStartBlock +
                    challenger.challengeDelayBlocks(),
            "HyperlaneServiceManager: Invalid unenrollment"
        );

        enrolledChallengers[operator].remove(address(challenger));
        emit OperatorUnenrolledFromChallenger(
            operator,
            challenger,
            block.number
        );
    }

    /// @inheritdoc ECDSAServiceManagerBase
    function _deregisterOperatorFromAVS(
        address operator
    ) internal virtual override {
        address[] memory challengers = getOperatorChallengers(operator);
        _completeUnenrollment(operator, challengers);

        IAVSDirectory(avsDirectory).deregisterOperatorFromAVS(operator);
        emit OperatorDeregisteredFromAVS(operator);
    }
}