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// Respond to button clicks on attached cards
if (event.type === "CARD_CLICKED") {

  // Open the first dialog.
  if (event.common.invokedFunction === "openDialog") {
    openDialog(event);
  }

  // Open the second dialog.
  if (event.common.invokedFunction === "openNextDialog") {
    openNextDialog(event);
  }
}

/**
* Opens and starts a dialog that lets users add details about a contact.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openDialog(event) {
  res.json({ "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      { "buttonList": { "buttons": [{
        "text": "Next",
        "onClick": { "action": {
          "function": "openNextDialog"
        }}
      }]}}
    ]}]}}}
  }});
};

/**
* Opens a second dialog that lets users add more contact details.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openNextDialog(event) {
  res.json({ "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      {
        "horizontalAlignment": "END",
        "buttonList": { "buttons": [{
          "text": "Submit",
          "onClick": { "action": {
            "function": "submitDialog"
          }}
        }]}
      }
    ]}]}}}
  }});
}

from typing import Any, Mapping

import flask
import functions_framework

@functions_framework.http
def main(req: flask.Request) -> Mapping[str, Any]:
  """Responds to a MESSAGE event in Google Chat that includes the /createContact
     slash command by opening a dialog.

  Args:
      req (flask.Request): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """

  if req.method == 'GET':
    return 'Sorry, this function must be called from a Google Chat.'

  request = req.get_json(silent=True)

  if request.get('type') == 'CARD_CLICKED':
    if invoked_function := request.get('common', dict()).get('invokedFunction'):
      if invoked_function == 'open_dialog':
        return open_dialog(request)

      elif invoked_function == 'open_next_dialog':
        return open_dialog(request)

def open_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a dialog in Google Chat.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return { "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      { "buttonList": { "buttons": [{
        "text": "Next",
        "onClick": { "action": {
          "function": "open_next_dialog"
        }}
      }]}}
    ]}]}}}
  }}

def open_next_dialog(request: Mapping[str, Any]) -> Mapping[str, Any]:
  """Opens a second dialog that lets users add more contact details.

  Args:
      request (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: open a Dialog in response to a card's button click.
  """
  return { "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      {
        "horizontalAlignment": "END",
        "buttonList": { "buttons": [{
          "text": "Submit",
          "onClick": { "action": {
            "function": "submit_dialog"
          }}
        }]}
      }
    ]}]}}}
  }}

/**
* Responds to a CARD_CLICKED event in Google Chat.
*
* @param {Object} event the event object from Google Chat
*/
function onCardClick(event) {

  // When a user clicks a card, the Chat app checks to see which function to run.
  if (event.common.invokedFunction === "openDialog") {
    return openDialog(event);
  }

  if (event.common.invokedFunction === "openNextDialog") {
    return openNextDialog(event);
  }
}

/**
* Opens and starts a dialog that lets users add details about a contact.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openDialog(event) {
  return { "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      { "buttonList": { "buttons": [{
        "text": "Next",
        "onClick": { "action": {
          "function": "openNextDialog"
        }}
      }]}}
    ]}]}}}
  }};
}

/**
* Opens a second dialog that lets users add more contact details.
*
* @param {object} event the event object from Google Chat.
*
* @return {object} open a dialog.
*/
function openNextDialog(event) {
  return { "actionResponse": {
    "type": "DIALOG",
    "dialogAction": { "dialog": { "body": { "sections": [{ "widgets": [
      WIDGETS,
      {
        "horizontalAlignment": "END",
        "buttonList": { "buttons": [{
          "text": "Submit",
          "onClick": { "action": {
            "function": "submitDialog"
          }}
        }]}
      }
    ]}]}}}
  }};
}

/**
* Checks for a form input error, the absence of
* a "name" value, and returns an error if absent.
* Otherwise, confirms successful receipt of a dialog.
*
* Confirms successful receipt of a dialog.
*
* @param {Object} event the event object from Chat API.
*
* @return {Object} open a Dialog in Google Chat.
*/
function submitDialog(event) {

  // Checks to make sure the user entered a value
  // in a dialog. If no value detected, returns
  // an error message. Any "actionStatus" value other than "OK"
  // gets returned as an error.
  if (event.common.formInputs.WIDGET_NAME.stringInputs.value[0] === "") {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "ERROR_MESSAGE"
        }
      }
    });

    // Otherwise the Chat app indicates that it received
    // form data from the dialog. An "actionStatus" of "OK" is
    // interpreted as code 200, and the dialog closes.
  } else {
    res.json({
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    });
  }
}

def receive_dialog(event: Mapping[str, Any]) -> Mapping[str, Any]:
  """Checks for a form input error, the absence of a "name" value, and returns
     an error if absent. Otherwise, confirms successful receipt of a dialog.

  Args:
      event (Mapping[str, Any]): the event object from Chat API.

  Returns:
      Mapping[str, Any]: the response.
  """

  if common := event.get('common'):
    if form_inputs := common.get('formInputs'):
      if contact_name := form_inputs.get('WIDGET_NAME'):
        if string_inputs := contact_name.get('stringInputs'):
          if name := string_inputs.get('value')[0]:
            return {
              'actionResponse': {
                'type': 'DIALOG',
                'dialogAction': {
                  'actionStatus': 'OK'
                }
              }
            }
          else:
            return {
              'actionResponse': {
                'type': 'DIALOG',
                'dialogAction': {
                  'actionStatus': 'ERROR_MESSAGE'
                }
              }
            }

/**
* Checks for a form input error, the absence of
* a "name" value, and returns an error if absent.
* Otherwise, confirms successful receipt of a dialog.
*
* Confirms successful receipt of a dialog.
*
* @param {Object} event the event object from Chat API.
*
* @return {object} open a Dialog in Google Chat.
*/
function submitDialog(event) {

  // Checks to make sure the user entered a value
  // in a dialog. If no value detected, returns
  // an error message. Any "actionStatus" value other than "OK"
  // gets returned as an error.
  if (event.common.formInputs.WIDGET_NAME[""].stringInputs.value[0] === "") {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "ERROR_MESSAGE"
        }
      }
    };

    // Otherwise the Chat app indicates that it received
    // form data from the dialog. An "actionStatus" of "OK" is
    // interpreted as code 200, and the dialog closes.
  } else {
    return {
      "actionResponse": {
        "type": "DIALOG",
        "dialogAction": {
          "actionStatus": "OK"
        }
      }
    };
  }
}