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 the
/// account's tiles in the app's own words.
class const _PersonApp(final SignedIn person) extends StatelessWidget {
  @override
  Widget build(BuildContext context) => MaterialApp(
    localizationsDelegates: testLocalizationsDelegates,
    supportedLocales: HalkyonAppLocalizations.supportedLocales,
    home: Scaffold(
      body: ListView(
        children: [
          Text('App of ${person.authUserId}'),
          const AccountTiles(
            anonymousNote: 'Your notes stay on this device.',
            signOutAnonymousMessage:
                "This account can't be signed into again, so signing out "
                'deletes it with its notes.',
            deleteMessage: 'Your notes are deleted everywhere.',
          ),
        ],
      ),
    ),
  );
}

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

  Future<void> start(WidgetTester tester, {InstanceChoice? choice}) async {
    dependencies = TestAppDependencies(gateway: gateway);
    final gate = AppScope(
      dependencies: dependencies,
      child: SessionGate(
        look: (context) => (themeMode: ThemeMode.light, locale: null),
        app: _PersonApp.new,
      ),
    );
    await tester.pumpWidget(
      AppFrameScope(
        frame: testFrame(),
        child: switch (choice) {
          final choice? => InstanceScope(
            notifier: choice,
            checker: FakeInstanceChecker(),
            countryNames: MemoryCountryNames(const {}),
            subdivisionNames: const MemorySubdivisionNames({}),
            child: gate,
          ),
          null => gate,
        },
      ),
    );
    await tester.pumpAndSettle();
  }

  setUp(() => gateway = FakeAuthGateway());

  testWidgets('says whose account it is, anonymous on which instance, with '
      "the app's note", (tester) async {
    await start(tester);

    expect(find.text('Anonymous on test.example.org'), findsOneWidget);
    expect(find.text('Your notes stay on this device.'), findsOneWidget);
    expect(
      find.text('Switch account'),
      findsNothing,
      reason: 'no instances to switch among here',
    );
    expect(find.text('Sign out'), findsOneWidget);
    expect(find.text('Delete account'), findsOneWidget);
  });

  testWidgets('says the account is signed in, without the note', (
    tester,
  ) async {
    gateway = FakeAuthGateway(
      status: const SignedIn(authUserId: 'github-person', isIdentified: true),
    );
    await start(tester);

    expect(find.text('Signed in on test.example.org'), findsOneWidget);
    expect(find.text('Your notes stay on this device.'), findsNothing);
  });

  testWidgets('switching account lists the accounts on the device, the '
      'instance in use named', (tester) async {
    final instance = Instance.parse('learn.example.org')!;
    final choice = InstanceChoice(
      MemoryInstanceStore((current: instance, known: [instance])),
      builtIn: instance,
      forget: (instance) async {},
    );
    await choice.load(usedBefore: false);
    await start(tester, choice: choice);

    expect(find.text('Switch account'), findsOneWidget);
    expect(find.text('learn.example.org'), findsWidgets);

    await tester.tap(find.text('Switch account'));
    await tester.pumpAndSettle();

    expect(find.text('Accounts'), findsOneWidget);
  });

  testWidgets('signing out of an anonymous account asks first, in the '
      "app's words, as it deletes it; Cancel keeps it", (tester) async {
    await start(tester);

    await tester.tap(find.text('Sign out'));
    await tester.pumpAndSettle();
    expect(find.text('Sign out?'), findsOneWidget);
    expect(
      find.text(
        "This account can't be signed into again, so signing out deletes "
        'it with its notes.',
      ),
      findsOneWidget,
    );

    await tester.tap(find.text('Cancel'));
    await tester.pumpAndSettle();
    expect(find.text('App of anonymous-1'), findsOneWidget);
    expect(gateway.signOuts, 0);

    await tester.tap(find.text('Sign out'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Sign out').last);
    await tester.pumpAndSettle();

    expect(gateway.status, const SignedOut());
    expect(find.text('Signed out'), findsOneWidget);
  });

  testWidgets('signing out of an identified account asks nothing', (
    tester,
  ) async {
    gateway = FakeAuthGateway(
      status: const SignedIn(authUserId: 'github-person', isIdentified: true),
    );
    await start(tester);

    await tester.tap(find.text('Sign out'));
    await tester.pumpAndSettle();

    expect(find.text('Sign out?'), findsNothing);
    expect(gateway.status, const SignedOut());
  });

  testWidgets("deleting the account asks first, in the app's words; Cancel "
      'keeps it', (tester) async {
    await start(tester);

    await tester.tap(find.text('Delete account'));
    await tester.pumpAndSettle();
    expect(find.text('Delete your account?'), findsOneWidget);
    expect(find.text('Your notes are deleted everywhere.'), findsOneWidget);

    await tester.tap(find.text('Cancel'));
    await tester.pumpAndSettle();
    expect(gateway.accountDeletions, 0);

    await tester.tap(find.text('Delete account'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();

    expect(gateway.accountDeletions, 1);
    expect(find.text('Signed out'), findsOneWidget);
  });

  testWidgets('deleting an account whose setup never finished asks for the '
      'password and a code by mail', (tester) async {
    // The first person the fake password gateway makes.
    const person = '00000000-0000-4000-8000-000000000001';
    gateway = FakeAuthGateway(
      status: const SignedIn(authUserId: person, isIdentified: true),
    );
    await start(tester);
    dependencies.passwordGateway.addAccount(
      'anna@example.org',
      password: 'correct horse',
      crypto: dependencies.crypto,
      finished: false,
    );
    dependencies.addresses.addresses[person] = 'anna@example.org';
    Finder field(String label) => find.widgetWithText(TextField, label);

    await tester.tap(find.text('Delete account'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();

    expect(find.textContaining('a code by mail confirms it'), findsOneWidget);
    await tester.enterText(field('Current password'), 'correct horse');
    await tester.tap(find.text('Email me a code'));
    await tester.pumpAndSettle();
    expect(
      dependencies.passwordGateway.mailed.single.purpose,
      MailCodePurpose.deletion,
    );
    expect(find.textContaining('anna@example.org'), findsOneWidget);
    expect(gateway.accountDeletions, 0);

    await tester.enterText(
      field('Code from the email'),
      dependencies.passwordGateway.codeFor('anna@example.org'),
    );
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();

    expect(gateway.accountDeletions, 1);
    expect(
      dependencies.passwordGateway.accounts,
      isNot(contains('anna@example.org')),
    );
  });

  testWidgets('deleting an account with a password asks for it and a '
      'code, which a wrong one fails, deleting nothing', (tester) async {
    // The first person the fake password gateway makes.
    const person = '00000000-0000-4000-8000-000000000001';
    gateway = FakeAuthGateway(
      status: const SignedIn(authUserId: person, isIdentified: true),
    );
    await start(tester);
    dependencies.passwordGateway.addAccount(
      'anna@example.org',
      password: 'correct horse',
      crypto: dependencies.crypto,
    );
    // The address this device signed in with, which deleting sends.
    dependencies.addresses.addresses[person] = 'anna@example.org';
    Finder field(String label) => find.widgetWithText(TextField, label);

    await tester.tap(find.text('Delete account'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();

    expect(gateway.accountDeletions, 0);
    expect(field('Current password'), findsOneWidget);
    await tester.enterText(field('Current password'), 'wrong horse');
    await tester.enterText(
      field('Code from your authenticator app'),
      fakeTotpCode,
    );
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();
    expect(
      find.text("The address, the password or the code isn't right."),
      findsOneWidget,
    );
    expect(gateway.accountDeletions, 0);
    expect(dependencies.passwordGateway.accounts, contains('anna@example.org'));

    await tester.enterText(field('Current password'), 'correct horse');
    await tester.tap(find.text('Delete account').last);
    await tester.pumpAndSettle();

    expect(gateway.accountDeletions, 1);
    expect(
      dependencies.passwordGateway.accounts,
      isNot(contains('anna@example.org')),
    );
    expect(find.text('Signed out'), findsOneWidget);
  });

  testWidgets('speaks German', (tester) async {
    await start(tester);
    final german = lookupHalkyonAppLocalizations(const Locale('de'));

    expect(
      german.accountAnonymousOn('test.example.org'),
      'Anonym auf test.example.org',
    );
    expect(german.accountSignedInOn('x'), 'Angemeldet auf x');
    expect(german.accountSwitch, 'Konto wechseln');
    expect(german.accountSignOut, 'Abmelden');
    expect(german.accountSignOutTitle, 'Abmelden?');
    expect(german.accountDelete, 'Konto löschen');
    expect(german.accountDeleteTitle, 'Dein Konto löschen?');
  });
}