/**

* Copyright 2017 Google Inc. All Rights Reserved.

*

* Licensed under the Apache License, Version 2.0 (the 'License');

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an 'AS IS' BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

"use strict";

// [START all]

// [START import]

// The Cloud Functions for Firebase SDK to create Cloud Functions and set up triggers.

const functions = require('firebase-functions/v1');

// The Firebase Admin SDK to access Firestore.

const admin = require("firebase-admin");

admin.initializeApp();

// [END import]

// [START addMessage]

// Take the text parameter passed to this HTTP endpoint and insert it into

// Firestore under the path /messages/:documentId/original

// [START addMessageTrigger]

exports.addMessage = functions.https.onRequest(async (req, res) => {

// [END addMessageTrigger]

// Grab the text parameter.

const original = req.query.text;

// [START adminSdkAdd]

// Push the new message into Firestore using the Firebase Admin SDK.

const writeResult = await admin

.firestore()

.collection("messages")

.add({ original: original });

// Send back a message that we've successfully written the message

res.json({ result: `Message with ID: ${writeResult.id} added.` });

// [END adminSdkAdd]

});

// [END addMessage]

// [START makeUppercase]

// Listens for new messages added to /messages/:documentId/original and creates an

// uppercase version of the message to /messages/:documentId/uppercase

// [START makeUppercaseTrigger]

exports.makeUppercase = functions.firestore

.document("/messages/{documentId}")

.onCreate((snap, context) => {

// [END makeUppercaseTrigger]

// [START makeUppercaseBody]

// Grab the current value of what was written to Firestore.

const original = snap.data().original;

// Access the parameter `{documentId}` with `context.params`

functions.logger.log("Uppercasing", context.params.documentId, original);

const uppercase = original.toUpperCase();

// You must return a Promise when performing asynchronous tasks inside a Functions such as

// writing to Firestore.

// Setting an 'uppercase' field in Firestore document returns a Promise.

return snap.ref.set({ uppercase }, { merge: true });

// [END makeUppercaseBody]

});

// [END makeUppercase]

// [END all]