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Note for what is changed for week 3 task

AUTH Service

1. Isolated Auth Directory (lib/auth/)

Created a dedicated module to handle the logic and definitions of authentication:

  • auth_user.dart: An abstract representation of the authenticated user, stripping away provider-specific data.
  • auth_provider.dart: A formal interface (contract) defining necessary operations like logIn, createUser, and logOut.
  • auth_exceptions.dart: A collection of custom, provider-agnostic exceptions.
  • firebase_auth_provider.dart: The concrete implementation of the AuthProvider interface specifically for Firebase.

2. Generic AuthService (The Facade)

Updated lib/auth_service.dart to act as a singleton facade.

  • It wraps the AuthProvider and exposes its methods to the rest of the app.
  • Benefit: Switching from Firebase to another provider (like Supabase or a custom backend) now only requires changing one line of code in the service initialization.
import 'auth/auth_provider.dart';
import 'auth/auth_user.dart';
import 'auth/firebase_auth_provider.dart';

export 'auth/auth_user.dart';
export 'auth/auth_exceptions.dart';
export 'auth/auth_provider.dart';

Replace firebase_auth_provider.dart with other provider.

3. Clean Exception Handling

Refactored login_view.dart and register_view.dart to catch domain-specific exceptions:

  • Old way: Catching FirebaseAuthException.
  • New way: Catching UserNotFoundAuthException or WeakPasswordAuthException.
  • Result: The UI layer remains "blind" to the backend technology, resulting in cleaner, more readable code.

4. Decoupled Entry Point

Modified main.dart to remove direct Firebase dependencies.

  • Replaced Firebase-specific setup with AuthService().initialize().
  • The application entry point is now completely unaware of which authentication provider is being utilized under the hood.

CRUD local storage

Key Components

  • DatabaseNote: A model class representing the database row (ID, Text, UserID).
  • NotesService: A singleton service handling database initialization, table creation, and CRUD (Create, Read, Update, Delete) operations.
  • FutureBuilder Integration: The NotesView uses a FutureBuilder to asynchronously load and refresh the notes list.

Platform Note

sqflite is a native plugin. It does not support Flutter Web. * To test the notes feature, you must use an Android or iOS emulator/device. * Running on Web will result in a Database not open exception.

this one use sqflite as dependency

dependencies:
  flutter:
    sdk: flutter
  # Add these three lines:
  sqflite: ^2.3.0
  path_provider: ^2.1.2
  path: ^1.9.0

look for it on pubspec.yaml and add it

next run these to install it 

flutter pub get

also to make sure that the app work properly on waydroid we need to change the build engine

<application
        android:label="first_app"
        android:name="${applicationName}"
        android:icon="@mipmap/ic_launcher">

        <meta-data
            android:name="io.flutter.embedding.android.EnableImpeller"
            android:value="false" />

        <activity
            android:name=".MainActivity"
            ... >
            </activity>
    </application>

make sure it look like this

look for this at android/app/src/main/AndroidManifest.xml