import 'dart:async';

import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
import 'package:halkyon_learn_flutter/src/core/widget/chevron_field.dart';
import 'package:halkyon_learn_flutter/src/feature/auth/model/auth_status.dart';
import 'package:halkyon_learn_flutter/src/feature/profile/bloc/public_profile_bloc.dart';
import 'package:halkyon_learn_flutter/src/feature/profile/data/profile_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/profile/model/public_profile.dart';
import 'package:material_ui/material_ui.dart';

import '../../support/fake_auth_gateway.dart';
import '../../support/fake_file_picker.dart';
import '../../support/fake_profile_gateway.dart';
import '../../support/pump_app.dart';
import '../../support/test_dependencies.dart';

void main() {
  /// Opens the Profile tab of a person with an identity, whose profile the
  /// instance answers through [profiles].
  Future<void> showProfile(
    WidgetTester tester,
    FakeProfileGateway profiles, {
    bool identified = true,
    FakeFilePicker? files,
  }) async {
    tester.view.physicalSize = const Size(1000, 1800);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    await pumpApp(
      tester,
      testDependencies(
        authGateway: FakeAuthGateway(
          status: SignedIn(
            authUserId: 'github-person',
            isIdentified: identified,
          ),
        ),
        profileGateway: profiles,
        files: files,
      ),
      location: RoutePaths.profile,
    );
    await tester.pumpAndSettle();
  }

  Finder field(String label) => find.widgetWithText(TextField, label);

  /// The dialog's field for the handle.
  Finder handleInDialog() => find.descendant(
    of: find.byType(AlertDialog),
    matching: find.byType(TextField),
  );

  /// Types [handle] into the handle's dialog and waits for the instance to
  /// say whether it is free.
  Future<void> typeHandle(WidgetTester tester, String handle) async {
    await tester.enterText(handleInDialog(), handle);
    await tester.pump(const Duration(milliseconds: 400));
    await tester.pumpAndSettle();
  }

  testWidgets('a person with an identity writes first, then chooses a '
      'handle in a dialog saying whether it is free; that makes the profile '
      'with what was written', (tester) async {
    final profiles = FakeProfileGateway(taken: {'Tizian'});
    await showProfile(tester, profiles);

    expect(find.text('Public profile'), findsOneWidget);
    expect(find.text('Save'), findsNothing);
    await tester.enterText(field('Display name'), 'Tizian');
    await tester.enterText(field('Bio'), 'Learning Japanese.');
    await tester.tap(find.text('Display name'));
    await tester.pumpAndSettle();
    // Nothing to save without a handle.
    expect(profiles.saves, isEmpty);

    await tester.tap(find.text('Choose a handle'));
    await tester.pumpAndSettle();
    expect(find.text('Choose your handle'), findsOneWidget);
    await typeHandle(tester, 'tizian');
    expect(find.text('Someone else has this handle.'), findsOneWidget);
    expect(
      tester
          .widget<FilledButton>(find.widgetWithText(FilledButton, 'Choose'))
          .onPressed,
      isNull,
    );
    await typeHandle(tester, 'raisondetredev');
    expect(find.text('@raisondetredev is free'), findsOneWidget);
    await tester.tap(find.widgetWithText(FilledButton, 'Choose'));
    await tester.pumpAndSettle();

    expect(
      find.text('Others find you as @raisondetredev@halkyon.eu'),
      findsOneWidget,
    );
    expect(find.text('@raisondetredev'), findsOneWidget);
    expect(profiles.profile!.displayName, 'Tizian');
    expect(profiles.profile!.bio, 'Learning Japanese.');
    expect(find.text('Saved'), findsOneWidget);
  });

  testWidgets('a profile saves a field when it is left or Enter is pressed, '
      'only what changed, without losing what is being written', (
    tester,
  ) async {
    final profiles = FakeProfileGateway(
      profile: const PublicProfile(
        handle: 'raisondetredev',
        address: 'raisondetredev@halkyon.eu',
        displayName: 'Tizian',
      ),
    );
    await showProfile(tester, profiles);

    await tester.enterText(field('Display name'), 'Tizian K.');
    await tester.testTextInput.receiveAction(TextInputAction.done);
    await tester.pumpAndSettle();
    expect(profiles.saves.single.displayName, 'Tizian K.');

    await tester.enterText(field('Bio'), 'Learning Japanese.');
    // Into the next field: the bio is left, and saves.
    await tester.tap(find.text('Add link'));
    await tester.pumpAndSettle();
    expect(profiles.saves.last.bio, 'Learning Japanese.');
    expect(profiles.saves, hasLength(2));

    await tester.enterText(
      find.widgetWithText(TextField, 'https://…'),
      'https://halkyon.app',
    );
    await tester.testTextInput.receiveAction(TextInputAction.done);
    await tester.pumpAndSettle();
    expect(profiles.profile!.links, ['https://halkyon.app']);
    // What was written stays as it was written.
    expect(find.text('Tizian K.'), findsOneWidget);

    await tester.tap(find.byTooltip('Remove link'));
    await tester.pumpAndSettle();
    expect(profiles.profile!.links, isEmpty);
    expect(profiles.saves, hasLength(4));
  });

  testWidgets('the handle changes through the dialog, which says one is '
      'yours', (tester) async {
    final profiles = FakeProfileGateway(
      profile: const PublicProfile(
        handle: 'raisondetredev',
        address: 'raisondetredev@halkyon.eu',
        displayName: 'Tizian',
      ),
    );
    await showProfile(tester, profiles);

    await tester.tap(find.text('@raisondetredev'));
    await tester.pumpAndSettle();
    expect(find.text('Change your handle'), findsOneWidget);
    expect(find.text('This is your handle'), findsOneWidget);
    await typeHandle(tester, 'tizian_k');
    await tester.tap(find.widgetWithText(FilledButton, 'Change'));
    await tester.pumpAndSettle();

    expect(profiles.profile!.handle, 'tizian_k');
    expect(profiles.profile!.displayName, 'Tizian');
    expect(find.text('@tizian_k'), findsOneWidget);
  });

  testWidgets('once its person has published, the handle is fixed and the '
      'profile stays', (tester) async {
    await showProfile(
      tester,
      FakeProfileGateway(
        profile: const PublicProfile(
          handle: 'raisondetredev',
          address: 'raisondetredev@halkyon.eu',
          handleFixed: true,
        ),
      ),
    );

    expect(
      find.text('Fixed since you published: others refer to it.'),
      findsOneWidget,
    );
    expect(
      tester.widget<ChevronField>(find.byType(ChevronField)).onTap,
      isNull,
    );
    expect(find.text('Remove profile'), findsNothing);
  });

  testWidgets('removing a profile asks first, then frees its handle', (
    tester,
  ) async {
    final profiles = FakeProfileGateway(
      profile: const PublicProfile(
        handle: 'raisondetredev',
        address: 'raisondetredev@halkyon.eu',
      ),
    );
    await showProfile(tester, profiles);

    await tester.tap(find.text('Remove profile'));
    await tester.pumpAndSettle();
    expect(find.text('Remove your public profile?'), findsOneWidget);
    await tester.tap(find.text('Remove profile').last);
    await tester.pumpAndSettle();

    expect(find.text('Profile removed.'), findsOneWidget);
    expect(profiles.profile, isNull);
  });

  testWidgets('a saved profile takes a picture as its avatar, and gives it '
      'up', (tester) async {
    final profiles = FakeProfileGateway(
      profile: const PublicProfile(
        handle: 'raisondetredev',
        address: 'raisondetredev@halkyon.eu',
      ),
    );
    final files = FakeFilePicker()
      ..next = (name: 'me.jpg', bytes: Uint8List.fromList([1, 2, 3]));
    await showProfile(tester, profiles, files: files);

    await tester.tap(find.text('Choose picture'));
    await tester.pumpAndSettle();

    expect(profiles.avatars.single, [1, 2, 3]);
    expect(files.asked.single, contains('jpg'));
    expect(find.text('Saved'), findsOneWidget);
    await tester.tap(find.text('Remove picture'));
    await tester.pumpAndSettle();
    expect(profiles.profile!.avatarUrl, isNull);
    expect(find.text('Remove picture'), findsNothing);
  });

  testWidgets('a profile not yet saved has no picture to choose', (
    tester,
  ) async {
    await showProfile(tester, FakeProfileGateway());

    expect(find.text('Choose your handle to add a picture.'), findsOneWidget);
    expect(find.text('Choose picture'), findsNothing);
  });

  testWidgets('an anonymous person is told how to have one', (tester) async {
    await showProfile(tester, FakeProfileGateway(), identified: false);

    expect(
      find.text('Sign in to have a public profile and publish.'),
      findsOneWidget,
    );
    expect(find.text('Public profile'), findsNothing);
  });

  testWidgets('without the instance, it says so and tries again', (
    tester,
  ) async {
    final profiles = FakeProfileGateway()..fail = Exception('offline');
    await showProfile(tester, profiles);

    expect(
      find.text("Your public profile can't be reached right now."),
      findsOneWidget,
    );
    profiles.fail = null;
    await tester.tap(find.text('Retry'));
    await tester.pumpAndSettle();
    expect(find.byType(ChevronField), findsOneWidget);
  });

  test('a save asked for while another is on its way follows it, the '
      'latest of those waiting; a handle chosen holds for the saves after '
      'it', () async {
    final gateway = _HeldProfileGateway(
      profile: const PublicProfile(
        handle: 'raisondetredev',
        address: 'raisondetredev@halkyon.eu',
      ),
    );
    final bloc = PublicProfileBloc(ProfileRepository(gateway))
      ..add(const PublicProfileEventStarted());
    addTearDown(bloc.close);
    await bloc.stream.firstWhere((state) => state is PublicProfileStateReady);

    PublicProfileEventSaved saved(String name, {String? handle}) =>
        PublicProfileEventSaved(
          displayName: name,
          bio: '',
          links: const [],
          handle: handle,
        );
    bloc
      ..add(saved('A'))
      ..add(saved('A', handle: 'tizian'))
      ..add(saved('B'));
    await pumpEventQueue();
    gateway.release();
    await pumpEventQueue();
    gateway.release();
    await pumpEventQueue();

    // The second gave way to the third, which kept its handle.
    expect(
      [for (final s in gateway.saves) (s.handle, s.displayName)],
      [
        ('raisondetredev', 'A'),
        ('tizian', 'B'),
      ],
    );
  });

  test(
    'the repository leaves blank links out and trims what it saves',
    () async {
      final profiles = FakeProfileGateway();
      await ProfileRepository(profiles).save(
        handle: ' tizian ',
        displayName: ' Tizian ',
        bio: '',
        links: ['', ' https://halkyon.app '],
      );

      expect(profiles.profile!.handle, 'tizian');
      expect(profiles.profile!.links, ['https://halkyon.app']);
    },
  );

  group('verified links', () {
    PublicProfile withLinks(List<String> links) => PublicProfile(
      handle: 'raisondetredev',
      address: 'raisondetredev@halkyon.eu',
      links: links,
      pageUrl: 'https://halkyon.eu/@raisondetredev',
    );

    testWidgets('the profile page to link back to shows, and its address '
        'copies', (tester) async {
      String? copied;
      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
        SystemChannels.platform,
        (call) async {
          if (call.method == 'Clipboard.setData') {
            copied = (call.arguments as Map)['text'] as String?;
          }
          return null;
        },
      );
      addTearDown(
        () => tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
          SystemChannels.platform,
          null,
        ),
      );
      await showProfile(tester, FakeProfileGateway(profile: withLinks([])));

      expect(
        find.text('Your profile page: halkyon.eu/@raisondetredev'),
        findsOneWidget,
      );
      await tester.tap(find.byTooltip('Copy the address'));
      await tester.pumpAndSettle();

      expect(copied, 'https://halkyon.eu/@raisondetredev');
      expect(find.text('Address copied.'), findsOneWidget);
    });

    testWidgets('a link saved is checked by itself, and gets a checkmark once '
        'its page links back, without a message', (tester) async {
      final profiles = FakeProfileGateway(profile: withLinks([]))
        ..linkingBack.add('https://halkyon.app');
      await showProfile(tester, profiles);

      await tester.tap(find.text('Add link'));
      await tester.pumpAndSettle();
      await tester.enterText(
        find.widgetWithText(TextField, 'https://…'),
        'https://halkyon.app',
      );
      await tester.testTextInput.receiveAction(TextInputAction.done);
      await tester.pumpAndSettle();

      expect(profiles.linkChecks, 1);
      expect(find.byTooltip('Links back to your profile'), findsOneWidget);
      expect(find.textContaining('Checked:'), findsNothing);
    });

    testWidgets('Check links checks again, and says how many link back', (
      tester,
    ) async {
      final profiles = FakeProfileGateway(
        profile: withLinks(['https://halkyon.app', 'https://example.org']),
      )..linkingBack.add('https://example.org');
      await showProfile(tester, profiles);
      expect(find.byTooltip('Links back to your profile'), findsNothing);

      await tester.tap(find.text('Check links'));
      await tester.pumpAndSettle();

      expect(
        find.text('Checked: 1 of 2 links link back to your profile.'),
        findsOneWidget,
      );
      expect(find.byTooltip('Links back to your profile'), findsOneWidget);
    });

    testWidgets('checking too often says so', (tester) async {
      final profiles = FakeProfileGateway(
        profile: withLinks(['https://halkyon.app']),
      )..refuseLinkChecks = true;
      await showProfile(tester, profiles);

      await tester.tap(find.text('Check links'));
      await tester.pumpAndSettle();

      expect(
        find.text('The links were checked too often. Try again in an hour.'),
        findsOneWidget,
      );
    });

    test('a check that ends after a save keeps what was saved, and adds the '
        "check's answer to it", () async {
      final profiles =
          FakeProfileGateway(
              profile: withLinks(['https://a.example']),
            )
            ..linkingBack.add('https://a.example')
            ..checkWaits = Completer();
      final bloc = PublicProfileBloc(ProfileRepository(profiles))
        ..add(const PublicProfileEventStarted());
      addTearDown(bloc.close);
      await expectLater(
        bloc.stream,
        emitsThrough(isA<PublicProfileStateReady>()),
      );

      bloc.add(const PublicProfileEventLinksChecked());
      await expectLater(
        bloc.stream,
        emits(
          isA<PublicProfileStateReady>().having(
            (state) => state.checkingLinks,
            'checking',
            isTrue,
          ),
        ),
      );
      bloc.add(
        const PublicProfileEventSaved(
          displayName: 'Tizian',
          bio: '',
          links: ['https://a.example'],
        ),
      );
      await expectLater(
        bloc.stream,
        emitsThrough(
          isA<PublicProfileStateReady>().having(
            (state) => state.outcome,
            'outcome',
            PublicProfileOutcome.saved,
          ),
        ),
      );
      profiles.checkWaits!.complete();

      await expectLater(
        bloc.stream,
        emits(
          isA<PublicProfileStateReady>()
              .having((state) => state.profile?.displayName, 'name', 'Tizian')
              .having(
                (state) => state.profile?.verifiedLinks,
                'verified',
                ['https://a.example'],
              ),
        ),
      );
    });
  });
}

/// Saves only once [release] lets each through.
class _HeldProfileGateway({super.profile}) extends FakeProfileGateway {
  final _held = <Completer<void>>[];

  /// Lets the save waiting longest through.
  void release() => _held.removeAt(0).complete();

  @override
  Future<PublicProfile> save({
    required String handle,
    required String displayName,
    required String bio,
    required List<String> links,
  }) async {
    final held = Completer<void>();
    _held.add(held);
    await held.future;
    return await super.save(
      handle: handle,
      displayName: displayName,
      bio: bio,
      links: links,
    );
  }
}