// SPDX-License-Identifier: MIT
pragma solidity ^0.8.24;

import {IDiamondCut} from "../src/interfaces/IDiamondCut.sol";

/**
 * @title FacetCutHelper
 * @notice Helper contract to get function selectors from facet contracts
 */
library FacetCutHelper {
    function getSelectors(address facet) internal view returns (bytes4[] memory) {
        bytes memory facetCode = _getCreationCode(facet);
        return _extractSelectors(facetCode);
    }

    function _getCreationCode(address contractAddress) internal view returns (bytes memory) {
        uint256 size;
        assembly {
            size := extcodesize(contractAddress)
        }
        bytes memory code = new bytes(size);
        assembly {
            extcodecopy(contractAddress, add(code, 0x20), 0, size)
        }
        return code;
    }

    function _extractSelectors(bytes memory bytecode) internal pure returns (bytes4[] memory) {
        // Simplified selector extraction - in production use proper parsing
        // This is a placeholder - actual implementation would parse bytecode
        bytes4[] memory selectors = new bytes4[](100); // Max selectors
        uint256 count = 0;
        
        // This is a simplified version - proper implementation would parse the bytecode
        // For now, return empty and require manual selector lists
        return new bytes4[](0);
    }
}