// File: @openzeppelin/contracts/GSN/Context.sol

// SPDX-License-Identifier: MIT

pragma solidity ^0.6.0;

/*
 * @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 GSN 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 virtual view returns (address payable) {
        return msg.sender;
    }

    function _msgData() internal virtual view returns (bytes memory) {
        this; // silence state mutability warning without generating bytecode - see https://github.com/ethereum/solidity/issues/2691
        return msg.data;
    }
}

// File: @openzeppelin/contracts/access/Ownable.sol

pragma solidity ^0.6.0;

/**
 * @dev Contract module which provides a basic access control mechanism, where
 * there is an account (an owner) that can be granted exclusive access to
 * specific functions.
 *
 * By default, the owner account will be the one that deploys the contract. This
 * can later be changed with {transferOwnership}.
 *
 * This module is used through inheritance. It will make available the modifier
 * `onlyOwner`, which can be applied to your functions to restrict their use to
 * the owner.
 */
contract Ownable is Context {
    address private _owner;

    event OwnershipTransferred(
        address indexed previousOwner,
        address indexed newOwner
    );

    /**
     * @dev Initializes the contract setting the deployer as the initial owner.
     */
    constructor() internal {
        address msgSender = _msgSender();
        _owner = msgSender;
        emit OwnershipTransferred(address(0), msgSender);
    }

    /**
     * @dev Returns the address of the current owner.
     */
    function owner() public view returns (address) {
        return _owner;
    }

    /**
     * @dev Throws if called by any account other than the owner.
     */
    modifier onlyOwner() {
        require(_owner == _msgSender(), "Ownable: caller is not the owner");
        _;
    }

    /**
     * @dev Leaves the contract without owner. It will not be possible to call
     * `onlyOwner` functions anymore. Can only be called by the current owner.
     *
     * NOTE: Renouncing ownership will leave the contract without an owner,
     * thereby removing any functionality that is only available to the owner.
     */
    function renounceOwnership() public virtual onlyOwner {
        emit OwnershipTransferred(_owner, address(0));
        _owner = address(0);
    }

    /**
     * @dev Transfers ownership of the contract to a new account (`newOwner`).
     * Can only be called by the current owner.
     */
    function transferOwnership(address newOwner) public virtual onlyOwner {
        require(
            newOwner != address(0),
            "Ownable: new owner is the zero address"
        );
        emit OwnershipTransferred(_owner, newOwner);
        _owner = newOwner;
    }
}

// File: @openzeppelin/contracts/utils/Pausable.sol

pragma solidity ^0.6.0;

/**
 * @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.
 */
contract Pausable is Context {
    /**
     * @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);

    bool private _paused;

    /**
     * @dev Initializes the contract in unpaused state.
     */
    constructor() internal {
        _paused = false;
    }

    /**
     * @dev Returns true if the contract is paused, and false otherwise.
     */
    function paused() public view returns (bool) {
        return _paused;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is not paused.
     *
     * Requirements:
     *
     * - The contract must not be paused.
     */
    modifier whenNotPaused() {
        require(!_paused, "Pausable: paused");
        _;
    }

    /**
     * @dev Modifier to make a function callable only when the contract is paused.
     *
     * Requirements:
     *
     * - The contract must be paused.
     */
    modifier whenPaused() {
        require(_paused, "Pausable: not paused");
        _;
    }

    /**
     * @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());
    }
}

// File: contracts/market/GitHubMarket.sol

pragma solidity ^0.6.0;

interface IMarketBehavior {
    function authenticate(
        address _prop,
        string calldata _args1,
        string calldata _args2,
        string calldata _args3,
        string calldata _args4,
        string calldata _args5,
        address market,
        address account
    )
        external
        returns (
            // solium-disable-next-line indentation
            bool
        );

    function schema() external view returns (string memory);

    function getId(address _metrics) external view returns (string memory);

    function getMetrics(string calldata _id) external view returns (address);
}

interface IMarket {
    function authenticate(
        address _prop,
        string calldata _args1,
        string calldata _args2,
        string calldata _args3,
        string calldata _args4,
        string calldata _args5
    )
        external
        returns (
            // solium-disable-next-line indentation
            bool
        );

    function authenticatedCallback(address _property, bytes32 _idHash)
        external
        returns (address);

    function deauthenticate(address _metrics) external;

    function schema() external view returns (string memory);

    function behavior() external view returns (address);

    function enabled() external view returns (bool);

    function votingEndBlockNumber() external view returns (uint256);

    function toEnable() external;
}

contract GitHubMarket is IMarketBehavior, Ownable, Pausable {
    address private khaos;
    address private associatedMarket;
    address private operator;
    bool public migratable = true;
    bool public priorApproval = true;

    mapping(address => string) private repositories;
    mapping(bytes32 => address) private metrics;
    mapping(bytes32 => address) private properties;
    mapping(bytes32 => address) private markets;
    mapping(bytes32 => bool) private pendingAuthentication;
    mapping(bytes32 => bool) private authenticationed;
    mapping(string => bool) private publicSignatures;
    event Registered(address _metrics, string _repository);
    event Authenticated(string _repository, uint256 _status, string message);
    event Query(
        string githubRepository,
        string publicSignature,
        address account
    );

    /*
    _githubRepository: ex)
                        personal repository: Akira-Taniguchi/cloud_lib
                        organization repository: dev-protocol/protocol
    _publicSignature: signature string(created by Khaos)
    */
    function authenticate(
        address _prop,
        string memory _githubRepository,
        string memory _publicSignature,
        string memory,
        string memory,
        string memory,
        address _dest,
        address account
    ) external override whenNotPaused returns (bool) {
        require(
            msg.sender == address(0) || msg.sender == associatedMarket,
            "Invalid sender"
        );

        if (priorApproval) {
            require(
                publicSignatures[_publicSignature],
                "it has not been approved"
            );
        }
        bytes32 key = createKey(_githubRepository);
        require(authenticationed[key] == false, "already authinticated");
        emit Query(_githubRepository, _publicSignature, account);
        properties[key] = _prop;
        markets[key] = _dest;
        pendingAuthentication[key] = true;
        return true;
    }

    function khaosCallback(
        string memory _githubRepository,
        uint256 _status,
        string memory _message
    ) external whenNotPaused {
        require(msg.sender == khaos, "illegal access");
        require(_status == 0, _message);
        bytes32 key = createKey(_githubRepository);
        require(pendingAuthentication[key], "not while pending");
        emit Authenticated(_githubRepository, _status, _message);
        authenticationed[key] = true;
        register(key, _githubRepository, markets[key], properties[key]);
    }

    function register(
        bytes32 _key,
        string memory _repository,
        address _market,
        address _property
    ) private {
        address _metrics = IMarket(_market).authenticatedCallback(
            _property,
            _key
        );
        repositories[_metrics] = _repository;
        metrics[_key] = _metrics;
        emit Registered(_metrics, _repository);
    }

    function createKey(string memory _repository)
        private
        pure
        returns (bytes32)
    {
        return keccak256(abi.encodePacked(_repository));
    }

    function getId(address _metrics)
        external
        override
        view
        returns (string memory)
    {
        return repositories[_metrics];
    }

    function getMetrics(string memory _repository)
        external
        override
        view
        returns (address)
    {
        return metrics[createKey(_repository)];
    }

    function migrate(
        string memory _repository,
        address _market,
        address _property
    ) external onlyOwner {
        require(migratable, "now is not migratable");
        bytes32 key = createKey(_repository);
        authenticationed[key] = true;
        register(key, _repository, _market, _property);
    }

    function done() external onlyOwner {
        migratable = false;
    }

    function setPriorApprovalMode(bool _value) external onlyOwner {
        priorApproval = _value;
    }

    function addPublicSignaturee(string memory _publicSignature) external {
        require(
            msg.sender == owner() || msg.sender == operator,
            "Invalid sender"
        );
        publicSignatures[_publicSignature] = true;
    }

    function setOperator(address _operator) external onlyOwner {
        operator = _operator;
    }

    function setKhaos(address _khaos) external onlyOwner {
        khaos = _khaos;
    }

    function setAssociatedMarket(address _associatedMarket) external onlyOwner {
        associatedMarket = _associatedMarket;
    }

    function schema() external override view returns (string memory) {
        return
            '["GitHub Repository (e.g, your/awesome-repos)", "Khaos Public Signature"]';
    }

    function pause() external whenNotPaused onlyOwner {
        _pause();
    }

    function unpause() external whenPaused onlyOwner {
        _unpause();
    }
}