// SPDX-License-Identifier: MIT
pragma solidity ^0.8.23;

// interfaces

// libraries
import {EnumerableSet} from "@openzeppelin/contracts/utils/structs/EnumerableSet.sol";

// contracts

library DiamondCutStorage {
    // keccak256(abi.encode(uint256(keccak256("diamond.facets.cut.storage")) - 1)) & ~bytes32(uint256(0xff))
    bytes32 internal constant STORAGE_SLOT =
        0xc6b63261e9313602f31108199c5a3f80ebd1f09ec3eaeb70561a2265ce2fc900;

    /// @notice Facet cut struct
    /// @param facet Set of facets
    /// @param facetBySelector Mapping of function selectors to their facet
    /// @param selectorsByFacet Mapping of facet to function selectors
    // @custom:storage-location erc7201:diamond.facets.cut.storage
    struct Layout {
        EnumerableSet.AddressSet facets;
        mapping(bytes4 selector => address facet) facetBySelector;
        mapping(address => EnumerableSet.Bytes32Set) selectorsByFacet;
    }

    function layout() internal pure returns (Layout storage ds) {
        bytes32 slot = STORAGE_SLOT;
        assembly {
            ds.slot := slot
        }
    }
}