simple-task-no-prepayment.ts

// ============= ============= Create Simple Task with NO Prepayment Use Case Business Logic  ============= ============= //
  // #region Create Simple Task With NO Prepayment Use Case Business Logic

  /**************************************************************************
   * Create Simple Task With NO Prepayment Use Case Business Logic
   * The difference with the simple create task is we will transfer the execution gas fees
   * at the time of execution, for that we will require our contract to hold balance
   *
   * Step 1 : createTaskNoPrepayment()
   *          - requiere the contract to have funds or to receive funds
   *          - will create the task, we add ETH as the feetoken 
   *          - will store the taskId
   *
   * Step 2 : checkerNoPrepayment() Function.
   *          - Check If the task can be executed , in this case if we do not have headache
   *          - returns the execPayload of startPartyNoPrepayment()
   *
   * Step 3 : Executable Function: startPartyNoPrepayment()
   *          - get Fee Details and transfer the requiered funds to Gelato
   *          - will Start the party setting lastPartyStart to block.timestamp
   *          - will cause a headache
   *************************************************************************/

  function createTaskNoPrepayment() public payable {
    require(taskIdByUser[msg.sender] == bytes32(0), "TASK_STILL_ACTIVE");

    require(
      msg.value >= 0.1 ether || address(this).balance > 0.1 ether,
      "NO_FUNDING"
    );

    bytes32 taskId = IOps(ops).createTaskNoPrepayment(
      address(this),
      this.startPartyNoPrepayment.selector,
      address(this),
      abi.encodeWithSelector(this.checkerNoPrepayment.selector),
      ETH
    );
    taskIdByUser[msg.sender] = taskId;
  }

  function checkerNoPrepayment()
    external
    view
    returns (bool canExec, bytes memory execPayload)
  {
      canExec = headachePresent == false;

    execPayload = abi.encodeWithSelector(this.startPartyNoPrepayment.selector);
  }

  function startPartyNoPrepayment() external onlyOps {
    require(headachePresent == false, "NOT_READY");

    //// every task will be payed with a transfer of funds to gelato

    uint256 fee;
    address feeToken;

    (fee, feeToken) = IOps(ops).getFeeDetails();

    _transfer(fee, feeToken);
    lastPartyStart = block.timestamp;
    headachePresent = true;
  }

  // #endregion Create Simple Task Without Prepayment Use Case Business Logic