import 'package:flutter_test/flutter_test.dart';

import 'package:sxchnge_analytics/sxchnge_analytics.dart';

import 'package:sxchnge_auth/sxchnge_auth.dart';

void main() {
  late DateTime now;
  late DummyTwoFactorService service;
  setUp(() {
    now = DateTime(2026, 9, 12);
    service = DummyTwoFactorService(delay: Duration.zero, now: () => now);
  });
  Matcher error(FactorError code) =>
      throwsA(isA<FactorException>().having((e) => e.code, 'code', code));
  Future<FactorGrant> grant(FactorPurpose purpose, String op) async {
    final c = (await service.begin(purpose, op))!;
    return service.verify(c.id, '123456');
  }

  test(
    'protection is off until enrollment code and setting update complete',
    () async {
      final c = (await service.begin(FactorPurpose.enable, 'enable'))!;
      expect((await service.fetch()).enabled, false);
      await expectLater(
        service.verify(c.id, '000000'),
        error(FactorError.invalid),
      );
      expect((await service.fetch()).enabled, false);
      final g = await service.verify(c.id, '123456');
      expect((await service.fetch()).enabled, false);
      expect((await service.setEnabled(true, g.token)).enabled, true);
      await expectLater(
        service.setEnabled(false, g.token),
        error(FactorError.required),
      );
      final off = await grant(FactorPurpose.disable, 'disable');
      expect((await service.setEnabled(false, off.token)).enabled, false);
    },
  );
  test('grant is scope bound, one-use and expires', () async {
    final g = await grant(FactorPurpose.enable, 'enable');
    await expectLater(
      service.authorize(FactorPurpose.disable, 'disable', g.token),
      error(FactorError.required),
    );
    await expectLater(
      service.authorize(FactorPurpose.enable, 'other', g.token),
      error(FactorError.required),
    );
    now = now.add(const Duration(minutes: 6));
    await expectLater(
      service.authorize(FactorPurpose.enable, 'enable', g.token),
      error(FactorError.expired),
    );
  });
  test('resend has cooldown and invalidates old challenge', () async {
    final a = (await service.begin(FactorPurpose.enable, 'enable'))!;
    await expectLater(service.resend(a.id), error(FactorError.cooldown));
    await expectLater(
      service.begin(FactorPurpose.enable, 'enable'),
      error(FactorError.cooldown),
    );
    now = now.add(const Duration(seconds: 31));
    final b = await service.resend(a.id);
    await expectLater(
      service.verify(a.id, '123456'),
      error(FactorError.expired),
    );
    expect((await service.verify(b.id, '123456')).token, isNotEmpty);
  });
  test(
    'attempt limit survives resend and resets only after lock expires',
    () async {
      var c = (await service.begin(FactorPurpose.enable, 'enable'))!;
      for (var i = 0; i < 4; i++) {
        await expectLater(
          service.verify(c.id, '000000'),
          error(FactorError.invalid),
        );
      }
      now = now.add(const Duration(seconds: 31));
      c = await service.resend(c.id);
      await expectLater(
        service.verify(c.id, '000000'),
        error(FactorError.locked),
      );
      await expectLater(
        service.verify(c.id, '123456'),
        error(FactorError.locked),
      );
      await expectLater(
        service.begin(FactorPurpose.enable, 'enable'),
        error(FactorError.locked),
      );
      now = now.add(const Duration(minutes: 6));
      c = (await service.begin(FactorPurpose.enable, 'enable'))!;
      expect((await service.verify(c.id, '123456')).token, isNotEmpty);
    },
  );
  test('verification retry recovers the same unconsumed grant', () async {
    final c = (await service.begin(FactorPurpose.enable, 'enable'))!;
    final a = await service.verify(c.id, '123456');
    final b = await service.verify(c.id, '123456');
    expect(a.token, b.token);
    await service.setEnabled(true, a.token);
    await expectLater(
      service.verify(c.id, '123456'),
      error(FactorError.expired),
    );
  });
  test(
    'credential acceptance is pending until factor completes login',
    () async {
      service = DummyTwoFactorService(enabled: true, delay: Duration.zero);
      final login = LoginProvider(
        GuardedLoginService(
          const DummyLoginService(delay: Duration.zero),
          service,
        ),
      );
      addTearDown(login.dispose);
      await login.login(
        email: 'person@example.com',
        password: 'secret',
        locale: 'en',
      );
      expect(login.state.status, AuthStatus.challenge);
      expect(login.state.result!.userId, isEmpty);
      final c = login.state.result!.challenge!;
      final g = await service.verify(c.id, '123456');
      await login.complete(c, g);
      expect(login.state.status, AuthStatus.success);
      expect(login.state.result!.challenge, null);
    },
  );
  test(
    'login without enabled factor retains original success contract',
    () async {
      final login = LoginProvider(
        GuardedLoginService(
          const DummyLoginService(delay: Duration.zero),
          service,
        ),
      );
      addTearDown(login.dispose);
      await login.login(
        email: 'person@example.com',
        password: 'secret',
        locale: 'en',
      );
      expect(login.state.status, AuthStatus.success);
    },
  );
  test('stub factor policy cannot report a production login outcome', () async {
    final guarded = GuardedLoginService(_AcceptedCredentials(), service);
    final result = await guarded.login(
      const LoginRequest(
        email: 'person@example.com',
        password: 'secret',
        locale: 'en',
      ),
    );
    expect(result.isSimulated, true);
    expect(guarded.isSimulated, true);
  });
  test('provider ignores verification result after disposal', () async {
    final c = (await service.begin(FactorPurpose.enable, 'enable'))!;
    final recorder = JourneyRecorder(DummyAnalyticsService());
    addTearDown(recorder.dispose);
    final provider = TwoFactorProvider(
      service,
      c,
      recorder: recorder,
      journey: JourneyKind.security,
      now: () => now,
    );
    final pending = provider.submit('123456');
    provider.dispose();
    await pending;
    expect(provider.result, null);
  });
  test(
    'authenticator challenge is method aware and cannot resend email',
    () async {
      service = DummyTwoFactorService(
        enabled: true,
        delay: Duration.zero,
        method: FactorMethod.authenticator,
      );
      final c = (await service.begin(FactorPurpose.login, 'login'))!;
      expect(c.method, FactorMethod.authenticator);
      await expectLater(service.resend(c.id), error(FactorError.required));
    },
  );
  test('service errors never toggle protection', () async {
    final g = await grant(FactorPurpose.enable, 'enable');
    service.nextError = FactorError.unavailable;
    await expectLater(
      service.setEnabled(true, g.token),
      error(FactorError.unavailable),
    );
    expect((await service.fetch()).enabled, false);
  });
}

class _AcceptedCredentials implements LoginService {
  @override
  Future<AuthResult> login(LoginRequest request) async =>
      const AuthResult(userId: 'account', isSimulated: false);
}