import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_app/halkyon_app.dart';
import 'package:halkyon_app/testing.dart';
import 'package:material_ui/material_ui.dart';

/// A signed-in person's app as a test makes one: whose it is, and a way to
/// sign out.
class const _PersonApp(final SignedIn person) extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
    localizationsDelegates: testLocalizationsDelegates,
    supportedLocales: HalkyonAppLocalizations.supportedLocales,
    home: Scaffold(
      body: Builder(
        builder: (context) => Column(
          children: [
            Text('App of ${person.authUserId}'),
            TextButton(
              onPressed: () => context.read<SessionBloc>().add(
                const SessionEventSignOutRequested(),
              ),
              child: const Text('Sign out'),
            ),
          ],
        ),
      ),
    ),
  );
}

void main() {
  late FakeAuthGateway gateway;
  late TestAppDependencies dependencies;

  setUp(() {
    gateway = FakeAuthGateway();
    dependencies = TestAppDependencies(gateway: gateway);
  });

  Future<void> start(WidgetTester tester) async {
    await tester.pumpWidget(
      AppFrameScope(
        frame: testFrame(),
        child: AppScope(
          dependencies: dependencies,
          child: SessionGate(
            look: (context) => (themeMode: ThemeMode.light, locale: null),
            app: _PersonApp.new,
          ),
        ),
      ),
    );
    await tester.pumpAndSettle();
  }

  testWidgets('shows the app once signed in anonymously at a first start', (
    tester,
  ) async {
    await start(tester);

    expect(find.text('App of anonymous-1'), findsOneWidget);
  });

  testWidgets('offers to try again when signing in fails', (tester) async {
    gateway.signInError = Exception('No connection');
    await start(tester);

    expect(find.text("Couldn't reach the server."), findsOneWidget);

    gateway.signInError = null;
    await tester.tap(find.text('Try again'));
    await tester.pumpAndSettle();
    expect(find.text('App of anonymous-2'), findsOneWidget);
  });

  testWidgets('signed out, it asks how to start on the instance, making no '
      'account; starting without one makes one', (tester) async {
    await dependencies.signedOut.write(signedOut: true);
    await start(tester);

    expect(find.text('Signed out'), findsOneWidget);
    expect(find.text('Start on test.example.org:'), findsOneWidget);
    expect(find.text('Sign in with GitHub'), findsOneWidget);
    expect(find.text('Create an account'), findsOneWidget);
    expect(
      find.text('Use another instance'),
      findsNothing,
      reason: 'no instances to choose among here',
    );
    expect(gateway.signIns, 0);

    await tester.tap(find.text('Start without an account'));
    await tester.pumpAndSettle();

    expect(find.text('App of anonymous-1'), findsOneWidget);
    expect(dependencies.signedOut.signedOut, isFalse);
  });

  testWidgets('from there, GitHub signs in its person; a GitHub account '
      'nobody here has yet is said so', (tester) async {
    await dependencies.signedOut.write(signedOut: true);
    await start(tester);

    gateway.gitHubError = const GitHubSignInFailed(
      GitHubSignInProblem.unknownAccount,
    );
    await tester.tap(find.text('Sign in with GitHub'));
    await tester.pumpAndSettle();
    expect(
      find.text(
        // The package's sentence, then the app's on where GitHub is added.
        'No account here signs in with this GitHub account yet. Start '
        'without an account, then add GitHub in Settings.',
      ),
      findsOneWidget,
    );

    gateway.gitHubError = null;
    await tester.tap(find.text('Sign in with GitHub'));
    await tester.pumpAndSettle();
    // A password is offered first (ADR 0017, D2), while the sign-in is
    // recent enough to set one; put off, the person's app.
    expect(find.text('Set up a password'), findsWidgets);
    await tester.tap(find.text('Later'));
    await tester.pumpAndSettle();
    expect(find.text('App of github-person'), findsOneWidget);
    expect(gateway.signIns, 0);
  });

  testWidgets('after GitHub, offers no password to someone who has one, or '
      'where the instance offers none', (tester) async {
    dependencies.passwordGateway.offered = false;
    await dependencies.signedOut.write(signedOut: true);
    await start(tester);

    await tester.tap(find.text('Sign in with GitHub'));
    await tester.pumpAndSettle();
    expect(find.text('Later'), findsNothing);
    expect(find.text('App of github-person'), findsOneWidget);
  });

  testWidgets('offers only the ways the instance has', (tester) async {
    gateway.offersGitHub = false;
    dependencies.passwordGateway.offered = false;
    await dependencies.signedOut.write(signedOut: true);
    await start(tester);

    expect(find.text('Sign in with GitHub'), findsNothing);
    expect(find.text('Create an account'), findsNothing);
    expect(find.text('Start without an account'), findsOneWidget);
  });

  testWidgets('signing out, or the instance ending the session, asks how to '
      'start', (tester) async {
    gateway = FakeAuthGateway(
      status: const SignedIn(authUserId: 'ada', isIdentified: true),
    );
    dependencies = TestAppDependencies(gateway: gateway);
    await start(tester);
    expect(find.text('App of ada'), findsOneWidget);

    await tester.tap(find.text('Sign out'));
    await tester.pumpAndSettle();
    expect(find.text('Signed out'), findsOneWidget);
    expect(dependencies.signedOut.signedOut, isTrue);

    await tester.tap(find.text('Start without an account'));
    await tester.pumpAndSettle();
    gateway.revokeSession();
    await tester.pumpAndSettle();
    expect(find.text('Signed out'), findsOneWidget);
  });
}