library DiamondLib {

    bytes32 constant DIAMOND_STORAGE_POSITION = keccak256("diamond.standard.diamond.storage");

    struct DiamondStorage {

        // maps function selectors to the facets that execute the functions.
        // and maps the selectors to their position in the selectorSlots array.
        // func selector => address facet, selector position
        mapping(bytes4 => bytes32) facets;

        // array of slots of function selectors.
        // each slot holds 8 function selectors.
        mapping(uint256 => bytes32) selectorSlots;

        // The number of function selectors in selectorSlots
        uint16 selectorCount;

        // Used to query if a contract implements an interface.
        // Used to implement ERC-165.
        mapping(bytes4 => bool) supportedInterfaces;

        // The Seen.Haus AccessController
        IAccessControlUpgradeable accessController;

    }

    /**
     * @notice Get the Diamond storage slot
     *
     * @return ds - Diamond storage slot cast to DiamondStorage
     */
    function diamondStorage() internal pure returns (DiamondStorage storage ds) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }

    /**
     * @notice Add a supported interface to the Diamond
     *
     * @param _interfaceId - the interface to add
     */
    function addSupportedInterface(bytes4 _interfaceId) internal {

        // Get the DiamondStorage struct
        DiamondStorage storage ds = diamondStorage();

        // Flag the interfaces as supported
        ds.supportedInterfaces[_interfaceId] = true;
    }

    /**
     * @notice Implementation of ERC-165 interface detection standard.
     *
     * @param _interfaceId - the sighash of the given interface
     */
    function supportsInterface(bytes4 _interfaceId) internal view returns (bool) {

        // Get the DiamondStorage struct
        DiamondStorage storage ds = diamondStorage();

        // Return the value
        return ds.supportedInterfaces[_interfaceId] || false;
    }

}
/**
 * @title DiamondLib
 *
 * @notice Diamond storage slot and supported interfaces
 *
 * @notice Based on Nick Mudge's gas-optimized diamond-2 reference,
 * with modifications to support role-based access and management of
 * supported interfaces.
 *
 * Reference Implementation  : https://github.com/mudgen/diamond-2-hardhat
 * EIP-2535 Diamond Standard : https://eips.ethereum.org/EIPS/eip-2535
 *
 * N.B. Facet management functions from original `DiamondLib` were refactor/extracted
 * to JewelerLib, since business facets also use this library for access control and
 * managing supported interfaces.
 *
 * @author Nick Mudge <nick@perfectabstractions.com> (https://twitter.com/mudgen)
 * @author Cliff Hall <cliff@futurescale.com> (https://twitter.com/seaofarrows)
 */
function diamondStorage() internal pure returns (DiamondStorage storage ds) {
        bytes32 position = DIAMOND_STORAGE_POSITION;
        assembly {
            ds.slot := position
        }
    }
/**
 * @notice Get the Diamond storage slot
 *
 * @return ds - Diamond storage slot cast to DiamondStorage
 */