// SPDX-License-Identifier: Apache-2.0
pragma solidity 0.8.18;


contract ERC165CheckerMock {
  bytes4 constant InvalidID = 0xffffffff;
  bytes4 constant ERC165ID = 0x01ffc9a7;

  function doesContractImplementInterface(address _contract, bytes4 _interfaceId) external view returns (bool) {
    uint256 success;
    uint256 result;

    (success, result) = noThrowCall(_contract, ERC165ID);
    if (success == 0 || result == 0) {
      return false;
    }

    (success, result) = noThrowCall(_contract, InvalidID);
    if (success == 0 || result != 0) {
      return false;
    }

    (success, result) = noThrowCall(_contract, _interfaceId);
    if (success == 1 && result == 1) {
      return true;
    }
    return false;
  }

  function noThrowCall(
    address _contract,
    bytes4 _interfaceId
  ) private view returns (
    uint256 success,
    uint256 result
  ) {
    bytes4 erc165ID = ERC165ID;

    assembly {
      let x := mload(0x40)               // Find empty storage location using "free memory pointer"
      mstore(x, erc165ID)                // Place signature at beginning of empty storage
      mstore(add(x, 0x04), _interfaceId) // Place first argument directly next to signature

      success := staticcall(
        30000,     // 30k gas
        _contract, // To addr
        x,         // Inputs are stored at location x
        0x24,      // Inputs are 36 bytes long
        x,         // Store output over input (saves space)
        0x20       // Outputs are 32 bytes long
      )

      result := mload(x)                 // Load the result
    }
  }
}