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{
  "timeZone": "America/Los_Angeles",
  "exceptionLogging": "STACKDRIVER",
  "runtimeVersion": "V8",
  "addOns": {
    "common": {
      "name": "Calculator",
      "logoUrl": "https://www.gstatic.com/images/branding/productlogos/calculator_search/v1/web-24dp/logo_calculator_search_color_1x_web_24dp.png",
      "useLocaleFromApp": true
    },
    "flows": {
      "workflowElements": [
        {
          "id": "calculatorDemo",
          "state": "ACTIVE",
          "name": "Calculate",
          "description": "Asks the user for two values and a math operation, then performs the math operation on the values and outputs the result.",
          "workflowAction": {
            "inputs": [
              {
                "id": "value1",
                "description": "value1",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              },
              {
                "id": "value2",
                "description": "value2",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              },
              {
                "id": "operation",
                "description": "operation",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "STRING"
                }
              }
            ],
            "outputs": [
              {
                "id": "result",
                "description": "Calculated result",
                "cardinality": "SINGLE",
                "dataType": {
                  "basicType": "INTEGER"
                }
              }
            ],
            "onConfigFunction": "onConfigCalculate",
            "onExecuteFunction": "onExecuteCalculate"
          }
        }
      ]
    }
  }
}

/**
 * Generates and displays a configuration card for the sample calculation step.
 *
 * This function creates a card with input fields for two values and a drop-down
 * for selecting an arithmetic operation.
 *
 * The input fields are configured to let the user select outputs from previous
 * steps as input values using the `hostAppDataSource` property.
 */
function onConfigCalculate() {
  const firstInput = CardService.newTextInput()
  .setFieldName("value1")
  .setTitle("First Value")
  .setHostAppDataSource(
    CardService.newHostAppDataSource()
      .setWorkflowDataSource(
        CardService.newWorkflowDataSource()
          .setIncludeVariables(true)
      )
  );
  const secondInput = CardService.newTextInput()
    .setFieldName("value2")
    .setTitle("Second Value").setHostAppDataSource(
      CardService.newHostAppDataSource()
        .setWorkflowDataSource(
          CardService.newWorkflowDataSource()
            .setIncludeVariables(true)
        )
    );
  const selectionInput = CardService.newSelectionInput()
    .setTitle("operation")
    .setFieldName("operation")
    .setType(CardService.SelectionInputType.DROPDOWN)
    .addItem("+", "+", false)
    .addItem("-", "-", true)
    .addItem("x", "x", false)
    .addItem("/", "/", false);

  const sections = CardService.newCardSection()
    .setHeader("Action_sample: Calculate")
    .setId("section_1")
    .addWidget(firstInput)
    .addWidget(selectionInput)
    .addWidget(secondInput)

  var card = CardService.newCardBuilder()
    .addSection(sections)
    .build();

  return card;
}

/**
* Returns output variables from a step.
*
* This function constructs an object that, when returned, sends the
* provided variable values as output from the current step.
* The variable values are logged to the console for debugging purposes.
*/
function outputVariables(variableDataMap) {
const workflowAction = AddOnsResponseService.newReturnOutputVariablesAction()
  .setVariableDataMap(variableDataMap);

const hostAppAction = AddOnsResponseService.newHostAppAction()
  .setWorkflowAction(workflowAction);

const renderAction = AddOnsResponseService.newRenderActionBuilder()
  .setHostAppAction(hostAppAction)
  .build();

return renderAction;
}

/**
 * Executes the calculation step based on the inputs from a flow event.
 *
 * This function retrieves input values and the operation from the flow event,
 * performs the calculation, and returns the result as an output variable.
 * The function logs the event for debugging purposes.
 */
function onExecuteCalculate(event) {
  console.log("output: " + JSON.stringify(event));
  var calculatedValue = 0;
  var value1 = event.workflow.actionInvocation.inputs["value1"].integerValues[0];
  var value2 = event.workflow.actionInvocation.inputs["value2"].integerValues[0];
  var operation = event.workflow.actionInvocation.inputs["operation"].stringValues[0];

  if (operation == "+") {
    calculatedValue = value1 + value2;
  } else if (operation == "-") {
    calculatedValue = value1 - value2;
  } else if (operation == "x") {
    calculatedValue = value1 * value2;
  } else if (operation == "/") {
    calculatedValue = value1 / value2;
  }

  const variableDataMap = { "result": AddOnsResponseService.newVariableData().addIntegerValue(calculatedValue) };

  return outputVariables(variableDataMap);
}