- Introduction on base view model and stateless widget classes

- Implementation of firebase
- Implementation of dependency injection

Took 11 hours 26 minutes

lib/data/FirebaseAuthData.dart

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+// import 'package:firebase_auth/firebase_auth.dart';
+
+import 'package:firebase_auth/firebase_auth.dart';
+
+class FirebaseAuthData {
+  final FirebaseAuth firebaseAuth = FirebaseAuth.instance;
+
+  User getUser() {
+    return firebaseAuth.currentUser;
+  }
+
+  String getUid() {
+    return getUser()?.uid;
+  }
+
+  Future<UserCredential> signUpWithEmailAndPassword(
+      String email, String password) {
+    return firebaseAuth.createUserWithEmailAndPassword(
+        email: email, password: password);
+  }
+
+  Future<UserCredential> signIn(String email, String password) {
+    return firebaseAuth.signInWithEmailAndPassword(
+        email: email, password: password);
+  }
+
+  Future<void> resetPassword(String email) {
+    return firebaseAuth.sendPasswordResetEmail(email: email);
+  }
+
+  Future<void> signOut() {
+    return firebaseAuth.signOut();
+  }
+
+  Future<void> updateUsername(String newEmail) {
+    return getUser().updateEmail(newEmail);
+  }
+
+  Future<void> updatePassword(
+      String email, String password, String newPassword) async {
+    UserCredential credentials = await signIn(email, password);
+    return credentials.user.updatePassword(newPassword);
+  }
+
+  Future<void> updateProfile({String displayName, String photoURL}) {
+    return getUser()
+        .updateProfile(displayName: displayName, photoURL: photoURL);
+  }
+}

lib/data/ViewState.dart

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+import 'package:sealed_class/sealed_class.dart';
+
+@Sealed([Idle, HasStarted, HasData, HasError])
+abstract class ViewState {}
+
+class Idle implements ViewState {}
+
+class HasStarted implements ViewState {}
+
+class HasData implements ViewState {
+  final dynamic data;
+
+  HasData(this.data);
+}
+
+class HasError implements ViewState {
+  final String error;
+
+  HasError(this.error);
+}