From d83ed1abec86de94856c61177ef08bdba7d62296 Mon Sep 17 00:00:00 2001
From: Samarth Agarwal <samarthagarwal@live.com>
Date: Thu, 7 Jun 2018 22:56:55 +0530
Subject: [PATCH] Added updateLikesCount

---
 .firebaserc            |  5 +++++
 .gitignore             |  1 +
 firebase.json          |  8 ++++++++
 functions/src/index.ts | 40 +++++++++++++++++++++++++++++++++++++---
 4 files changed, 51 insertions(+), 3 deletions(-)
 create mode 100644 .firebaserc
 create mode 100644 firebase.json

diff --git a/.firebaserc b/.firebaserc
new file mode 100644
index 00000000..2e1e7524
--- /dev/null
+++ b/.firebaserc
@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "feedlyapp-9df9a"
+  }
+}
diff --git a/.gitignore b/.gitignore
index faf05750..a230b0b7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,6 +20,7 @@ npm-debug.log*
 coverage/
 dist/
 node_modules/
+functions/node_modules
 tmp/
 temp/
 hooks/
diff --git a/firebase.json b/firebase.json
new file mode 100644
index 00000000..67a15010
--- /dev/null
+++ b/firebase.json
@@ -0,0 +1,8 @@
+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint",
+      "npm --prefix \"$RESOURCE_DIR\" run build"
+    ]
+  }
+}
diff --git a/functions/src/index.ts b/functions/src/index.ts
index 9abe97e1..5f683897 100644
--- a/functions/src/index.ts
+++ b/functions/src/index.ts
@@ -1,8 +1,42 @@
 import * as functions from 'firebase-functions';
+import * as admin from 'firebase-admin';
+
+admin.initializeApp(functions.config().firebase);
 
 // Start writing Firebase Functions
 // https://firebase.google.com/docs/functions/typescript
 
-export const helloWorld = functions.https.onRequest((request, response) => {
- response.send("Hello from Firebase!");
-});
+export const updateLikesCount = functions.https.onRequest((request, response) => {
+
+    console.log(request.body);
+
+    const postId = request.body.postId;
+    const userId = request.body.userId;
+    const action = request.body.action; // 'like' or 'unlike'
+
+    admin.firestore().collection("posts").doc(postId).get().then((data) => {
+
+        let likesCount = data.data().likesCount || 0;
+        let likes = data.data().likes || [];
+
+        let updateData = {};
+
+        if(action == "like"){
+            updateData["likesCount"] = ++likesCount;
+            updateData[`likes.${userId}`] = true;
+        } else {
+            updateData["likesCount"] = --likesCount;
+            updateData[`likes.${userId}`] = false;
+        }
+
+        admin.firestore().collection("posts").doc(postId).update(updateData).then(() => {
+            response.status(200).send("Done")
+        }).catch((err) => {
+            response.status(err.code).send(err.message);
+        })
+
+    }).catch((err) => {
+        response.status(err.code).send(err.message);
+    })
+
+})