// SPDX-License-Identifier: MIT
/**
  ∩~~~~∩ 
  ξ ･×･ ξ 
  ξ　~　ξ 
  ξ　　 ξ 
  ξ　　 “~～~～〇 
  ξ　　　　　　 ξ 
  ξ ξ ξ~～~ξ ξ ξ 
　 ξ_ξξ_ξ　ξ_ξξ_ξ
Alpaca Fin Corporation
*/
// For testing purpose.

pragma solidity 0.6.12;

contract MockContractContext {
  function executeTransaction(
    address target,
    uint value,
    string calldata signature,
    bytes calldata data
  ) external payable returns (bytes memory) {
    bytes memory callData;

    if (bytes(signature).length == 0) {
      callData = data;
    } else {
      callData = abi.encodePacked(bytes4(keccak256(bytes(signature))), data);
    }

    // solium-disable-next-line security/no-call-value
    (bool success, bytes memory returnData) = target.call{value: value}(callData);
    require(success, _getRevertMsg(returnData));

    return returnData;
  }

  function _getRevertMsg(bytes memory _returnData) internal pure returns (string memory) {
    // If the _res length is less than 68, then the transaction failed silently (without a revert message)
    if (_returnData.length < 68) return "Transaction reverted silently";

    assembly {
      // Slice the sighash.
      _returnData := add(_returnData, 0x04)
    }
    return abi.decode(_returnData, (string)); // All that remains is the revert string
  }
}