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/**
 * Google Cloud Function that handles all Google Workspace Add On events for
 * the contact manager app.
 *
 * @param {Object} req Request sent from Google Chat space
 * @param {Object} res Response to send back
 */
exports.contactManager = function contactManager(req, res) {
  const chatEvent = req.body.chat;
  // Handle MESSAGE events
  if(chatEvent.messagePayload) {
    return res.send(handleMessage(req.body));
  // Handle button clicks
  } else if(chatEvent.buttonClickedPayload) {
    switch(req.body.commonEventObject.parameters.actionName) {
        case "openInitialDialog":
            return res.send(openInitialDialog(req.body));
        case "openConfirmationDialog":
            return res.send(openConfirmationDialog(req.body));
        case "submitDialog":
            return res.send(submitDialog(req.body));
    }
  }
};

/**
 * Responds to a message in Google Chat.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} response that handles dialogs.
 */
function handleMessage(event) {
  // Reply with a message that contains a button to open the initial dialog
  return { hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
    text: "To add a contact, use the `ADD CONTACT` button below.",
    accessoryWidgets: [{ buttonList: { buttons: [{
      text: "ADD CONTACT",
      onClick: { action: {
        // Use runtime environment variable set with self URL
        function: process.env.BASE_URL,
        parameters: [{ key: "actionName", value: "openInitialDialog" }],
        interaction: "OPEN_DIALOG"
      }}
    }]}}]
  }}}}};
}

/**
 * Opens the initial step of the dialog that lets users add contact details.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} open the dialog.
 */
function openInitialDialog(event) {
  return { action: { navigations: [{ pushCard: { sections: [{ widgets: [{
    textInput: {
      name: "contactName",
      label: "First and last name",
      type: "SINGLE_LINE"
    }},
    WIDGETS, {
    buttonList: { buttons: [{
      text: "NEXT",
      onClick: { action: {
        // Use runtime environment variable set with self URL
        function: process.env.BASE_URL,
        parameters: [{ key: "actionName", value: "openConfirmationDialog" }]
      }}
    }]}}
  ]}]}}]}};
}

/**
 * Opens the second step of the dialog that lets users confirm details.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} update the dialog.
 */
function openConfirmationDialog(event) {
  // Retrieve the form input values
  const name = event.commonEventObject.formInputs["contactName"].stringInputs.value[0];
  return { action: { navigations: [{ pushCard: { sections: [{ widgets: [{
    // Display the input values for confirmation
    textParagraph: { text: "<b>Name:</b> " + name }},
    WIDGETS, {
    buttonList: { buttons: [{
      text: "SUBMIT",
      onClick: { action: {
        // Use runtime environment variable set with self URL
        function: process.env.BASE_URL,
        parameters: [{
          key: "actionName", value: "submitDialog" }, {
          // Pass input values as parameters for last dialog step (submission)
          key: "contactName", value: name
        }]
      }}
    }]}}]
  }]}}]}};
}

/**
 * Responds to a message in Google Chat.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} response that handles dialogs.
 */
function onMessage(event) {
  // Reply with a message that contains a button to open the initial dialog
  return { hostAppDataAction: { chatDataAction: { createMessageAction: { message: {
    text: "To add a contact, use the `ADD CONTACT` button below.",
    accessoryWidgets: [{ buttonList: { buttons: [{
      text: "ADD CONTACT",
      onClick: { action: {
        function: "openInitialDialog",
        interaction: "OPEN_DIALOG"
      }}
    }]}}]
  }}}}};
}

/**
 * Opens the initial step of the dialog that lets users add contact details.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} open the dialog.
 */
function openInitialDialog(event) {
  return { action: { navigations: [{ pushCard: { sections: [{ widgets: [{
    textInput: {
      name: "contactName",
      label: "First and last name",
      type: "SINGLE_LINE"
    }},
    WIDGETS, {
    buttonList: { buttons: [{
      text: "NEXT",
      onClick: { action: { function : "openConfirmationDialog" }}
    }]}}
  ]}]}}]}};
}

/**
 * Opens the second step of the dialog that lets users confirm details.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} update the dialog.
 */
function openConfirmationDialog(event) {
  // Retrieve the form input values
  const name = event.commonEventObject.formInputs["contactName"].stringInputs.value[0];
  return { action: { navigations: [{ pushCard: { sections: [{ widgets: [{
    // Display the input values for confirmation
    textParagraph: { text: "<b>Name:</b> " + name }},
    WIDGETS, {
    buttonList: { buttons: [{
      text: "SUBMIT",
      onClick: { action: {
        function: "submitDialog",
        // Pass input values as parameters for last dialog step (submission)
        parameters: [{ key: "contactName", value: name }]
      }}
    }]}}]
  }]}}]}};
}

/**
 * Handles submission and closes the dialog.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} close the dialog with a status in text notification.
 */
function submitDialog(event) {
  // Validate the parameters.
  if (!event.commonEventObject.parameters["contactName"]) {
    return { action: {
      navigations: [{ endNavigation: "CLOSE_DIALOG"}],
      notification: { text: "Failure, the contact name was missing!" }
    }};
  }

  return { action: {
    navigations: [{ endNavigation: "CLOSE_DIALOG"}],
    notification: { text: "Success, the contact was added!" }
  }};
}

/**
 * Handles submission and closes the dialog.
 *
 * @param {Object} event The event object from the Google Workspace Add-on.
 * @return {Object} close the dialog with a status in text notification.
 */
function submitDialog(event) {
  // Validate the parameters.
  if (!event.commonEventObject.parameters["contactName"]) {
    return { action: {
      navigations: [{ endNavigation: "CLOSE_DIALOG"}],
      notification: { text: "Failure, the contact name was missing!" }
    }};
  }

  return { action: {
    navigations: [{ endNavigation: "CLOSE_DIALOG"}],
    notification: { text: "Success, the contact was added!" }
  }};
}