Added updateLikesCount

.firebaserc

@@ -0,0 +1,5 @@
+{
+  "projects": {
+    "default": "feedlyapp-9df9a"
+  }
+}

.gitignore

@@ -20,6 +20,7 @@ npm-debug.log*
 coverage/
 dist/
 node_modules/
+functions/node_modules
 tmp/
 temp/
 hooks/

firebase.json

@@ -0,0 +1,8 @@
+{
+  "functions": {
+    "predeploy": [
+      "npm --prefix \"$RESOURCE_DIR\" run lint",
+      "npm --prefix \"$RESOURCE_DIR\" run build"
+    ]
+  }
+}

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);
+    })
+
+})