adding bunch of stuff for user getting

services/userService.tsx

@@ -1,5 +1,37 @@
-class UserService {
-  
-}
+import { User as FirUser } from "firebase/auth";
+import { Firestore, getFirestore, doc, getDoc } from "firebase/firestore";
+import { User } from '../models/user'
 
-export {}
+export default class UserService {
+  private db : Firestore = getFirestore()
+  private static collectionName: string = "users"
+
+  constructor() {
+
+  }
+
+  // give back the avatar based on the person's google account avatar or if they set one then
+  getUserAvatar(firstName: string, lastName: string, avatar: string = null) {
+    if (avatar) {
+      return avatar
+    }
+
+    return `https://ui-avatars.com/api/?name=${firstName}+${lastName}`
+  }
+
+  async getUser(userId: string) : Promise<User | null> {
+    const docRef = doc(this.db, UserService.collectionName, userId);
+    const docSnap = await getDoc(docRef);
+
+    if (docSnap.exists()) {
+      console.log("Document data:", docSnap.data());
+      let user: User = docSnap.data() as User
+      return user
+    } else {
+      // doc.data() will be undefined in this case
+      console.log("user not found!");
+      
+      return null
+    }
+  }
+}