import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_learn_flutter/src/core/content/rich_content.dart';
import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
import 'package:halkyon_learn_flutter/src/core/widget/adaptive_sheet.dart';
import 'package:halkyon_learn_flutter/src/feature/auth/model/auth_status.dart';
import 'package:halkyon_learn_flutter/src/feature/card/data/card_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/card/data/card_repository.dart';
import 'package:halkyon_learn_flutter/src/feature/card/model/card_content.dart';
import 'package:halkyon_learn_flutter/src/feature/profile/model/public_profile.dart';
import 'package:halkyon_learn_flutter/src/feature/publish/model/publication.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/data/studyset_payload.dart';
import 'package:halkyon_learn_flutter/src/feature/studyset/model/studyset_content.dart';
import 'package:lucide_icons_flutter/lucide_icons.dart';
import 'package:material_ui/material_ui.dart';

import '../../support/fake_auth_gateway.dart';
import '../../support/fake_card_gateway.dart';
import '../../support/fake_profile_gateway.dart';
import '../../support/fake_publish_gateway.dart';
import '../../support/fake_studyset_gateway.dart';
import '../../support/pump_app.dart';
import '../../support/test_dependencies.dart';

const _profile = PublicProfile(
  handle: 'raisondetredev',
  address: 'raisondetredev@halkyon.eu',
);

void main() {
  late FakeStudysetGateway studysets;
  late FakeCardGateway cards;
  late FakePublishGateway publishing;

  setUp(() {
    studysets = FakeStudysetGateway();
    cards = FakeCardGateway();
    publishing = FakePublishGateway();
  });

  /// A studyset on this device before the app starts.
  void stored(
    String id,
    String title, {
    String? license,
    String? parent,
    String description = '',
  }) => studysets.receiveRemoteChange(
    id,
    encodeStudysetPayload(
      StudysetContent(
        title: title,
        description: description.isEmpty
            ? RichContent.empty()
            : RichContent.plain(description),
        license: license,
      ),
    ),
    parentId: parent,
  );

  /// Opens the screen of the studyset [id] as a person with an identity
  /// ([identified]), whose profile is [profile], in a window [width] wide.
  Future<void> showStudyset(
    WidgetTester tester,
    String id, {
    PublicProfile? profile = _profile,
    bool identified = true,
    double width = 1200,
  }) async {
    tester.view.physicalSize = Size(width, 1000);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    await pumpApp(
      tester,
      testDependencies(
        authGateway: FakeAuthGateway(
          status: SignedIn(
            authUserId: 'github-person',
            isIdentified: identified,
          ),
        ),
        studysetGateway: studysets,
        cardGateway: cards,
        profileGateway: FakeProfileGateway(profile: profile),
        publishGateway: publishing,
      ),
      location: RoutePaths.studyset(id),
    );
    await tester.pump(const Duration(seconds: 1));
    await tester.pumpAndSettle();
  }

  Future<void> openSheet(WidgetTester tester) async {
    await tester.tap(find.text('Share'));
    await tester.pumpAndSettle();
  }

  testWidgets('a private studyset is published under a name made from its '
      "title, at its author's handle", (tester) async {
    stored('japanese', 'Japanese', license: 'CC-BY-SA-4.0');
    await showStudyset(tester, 'japanese');
    expect(find.byIcon(LucideIcons.lock), findsOneWidget);

    await openSheet(tester);
    expect(find.text('Private · only you can see it'), findsOneWidget);
    expect(
      find.text('Found at halkyon.eu/@raisondetredev/japanese'),
      findsOneWidget,
    );
    expect(find.text('Allows publishing.'), findsOneWidget);
    await tester.enterText(
      find.widgetWithText(TextField, 'What changed'),
      'The first lessons.',
    );
    await tester.tap(find.text('Publish v1'));
    await tester.pumpAndSettle();

    expect(publishing.publishes.single, (
      studysetId: 'japanese',
      slug: 'japanese',
      notes: 'The first lessons.',
    ));
    expect(find.text('Published v1.'), findsOneWidget);
    expect(find.textContaining('Published · v1'), findsOneWidget);
    expect(find.text('halkyon.eu/@raisondetredev/japanese'), findsOneWidget);
    expect(
      find.text('Fixed since you first published: others refer to it.'),
      findsOneWidget,
    );
    expect(find.text('Publish v2'), findsOneWidget);
  });

  testWidgets("Explore's description starts as the studyset's own and goes "
      'with the release; the next publish starts from it', (tester) async {
    stored(
      'japanese',
      'Japanese',
      license: 'CC-BY-SA-4.0',
      description: 'From N5 on.',
    );
    await showStudyset(tester, 'japanese');
    await openSheet(tester);

    expect(find.text('Description on Explore'), findsOneWidget);
    expect(find.text('From N5 on.'), findsWidgets);
    await tester.tap(find.text('Publish v1'));
    await tester.pumpAndSettle();

    expect(publishing.descriptions.single?.plainText, 'From N5 on.');
    expect(find.text('Publish v2'), findsOneWidget);
  });

  testWidgets('a published studyset shows a globe, its releases and where '
      'it is', (tester) async {
    stored('japanese', 'Japanese', license: 'CC-BY-NC-ND-4.0');
    publishing = FakePublishGateway(
      publications: {
        'japanese': Publication(
          publicId: 'p',
          slug: 'nihongo',
          location: 'halkyon.eu/@raisondetredev/nihongo',
          releases: [
            Release(
              version: 2,
              releasedAt: DateTime.utc(2026, 10, 9),
              license: 'CC-BY-NC-ND-4.0',
              notes: 'N4 kanji',
            ),
            Release(
              version: 1,
              releasedAt: DateTime.utc(2026, 10, 2),
              license: 'CC-BY-NC-ND-4.0',
            ),
          ],
        ),
      },
    );
    await showStudyset(tester, 'japanese');
    expect(find.byIcon(LucideIcons.globe), findsOneWidget);

    await openSheet(tester);

    expect(find.text('Releases'), findsOneWidget);
    expect(find.text('N4 kanji'), findsOneWidget);
    expect(
      find.text(
        'Allows publishing as it is: learners keep their changes to '
        'themselves.',
      ),
      findsOneWidget,
    );
    expect(
      tester.widget<TextField>(find.widgetWithText(TextField, 'Name')).readOnly,
      isTrue,
    );
    expect(find.text('Publish v3'), findsOneWidget);
  });

  testWidgets('a published studyset is taken off Explore, after asking', (
    tester,
  ) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    publishing = FakePublishGateway(
      publications: {
        'japanese': Publication(
          publicId: 'p',
          slug: 'japanese',
          location: 'halkyon.eu/@raisondetredev/japanese',
          releases: [
            Release(
              version: 1,
              releasedAt: DateTime.utc(2026, 10, 9),
              license: 'CC-BY-4.0',
            ),
          ],
        ),
      },
    );
    await showStudyset(tester, 'japanese');

    await openSheet(tester);
    await tester.ensureVisible(find.text('Take off Explore'));
    await tester.pumpAndSettle();
    await tester.tap(find.text('Take off Explore'));
    await tester.pumpAndSettle();
    expect(find.text('Take it off Explore?'), findsOneWidget);
    await tester.tap(find.text('Take off Explore').last);
    await tester.pumpAndSettle();

    expect(find.text('Taken off Explore.'), findsOneWidget);
    expect(find.text('Withdrawn · copies get no updates'), findsOneWidget);
    expect(find.text('Take off Explore'), findsNothing);
    expect(find.text('Publish v2'), findsOneWidget);
  });

  testWidgets('without a public profile it asks for one first, and leads '
      'there', (tester) async {
    stored('japanese', 'Japanese', license: 'CC0-1.0');
    await showStudyset(tester, 'japanese', profile: null);

    await openSheet(tester);
    expect(
      find.text('A release names you by your public profile. Make one first.'),
      findsOneWidget,
    );
    expect(find.textContaining('Publish v'), findsNothing);
    await tester.tap(find.text('Make a public profile'));
    await tester.pumpAndSettle();

    expect(find.text('Public profile'), findsOneWidget);
  });

  testWidgets("a licence that doesn't allow passing it on is said, and the "
      'studysets inside the instance refuses are named', (tester) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    stored('kanji', 'Kanji', parent: 'japanese');
    publishing.refusals.add(
      PublishRefused(PublishProblem.licenseNotOpen, items: ['kanji']),
    );
    await showStudyset(tester, 'japanese');

    await openSheet(tester);
    await tester.tap(find.text('Publish v1'));
    await tester.pumpAndSettle();

    expect(
      // Tests speak American English.
      find.text("These studysets' licenses don't allow passing them on: Kanji"),
      findsOneWidget,
    );
  });

  testWidgets('a copy keeps the licence its original asks for', (
    tester,
  ) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    publishing.refusals.add(
      PublishRefused(PublishProblem.licenseMustStay, license: 'CC-BY-SA-4.0'),
    );
    await showStudyset(tester, 'japanese');

    await openSheet(tester);
    await tester.tap(find.text('Publish v1'));
    await tester.pumpAndSettle();

    expect(
      find.text(
        'Its original asks adaptations to stay under CC-BY-SA-4.0: choose '
        'it under Edit, for every studyset in it.',
      ),
      findsOneWidget,
    );
  });

  testWidgets('a studyset without a licence says so', (tester) async {
    stored('japanese', 'Japanese');
    await showStudyset(tester, 'japanese');

    await openSheet(tester);

    expect(find.text('None'), findsOneWidget);
    expect(
      find.text("Doesn't allow passing it on. Choose another under Edit."),
      findsOneWidget,
    );
  });

  testWidgets('a card changed differently on two devices is named, and '
      'opens', (tester) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    final repository = CardRepository(cards);
    final id = await repository.create(
      'japanese',
      CardContent(
        front: RichContent.plain('猫'),
        back: RichContent.plain('cat'),
      ),
    );
    final created = (await repository.cardsOf('japanese')).single;
    await repository.save(
      created,
      CardContent(
        front: RichContent.plain('猫'),
        back: RichContent.plain('a cat'),
      ),
    );
    cards.receiveRemoteRevision(
      id: 'rev-elsewhere',
      cardId: id,
      parents: created.heads,
      payload: encodeCardPayload(
        CardContent(
          front: RichContent.plain('猫'),
          back: RichContent.plain('the cat'),
        ),
      ),
    );
    publishing.refusals.add(
      PublishRefused(PublishProblem.conflicts, items: [id]),
    );
    await showStudyset(tester, 'japanese');

    await openSheet(tester);
    await tester.tap(find.text('Publish v1'));
    await tester.pumpAndSettle();
    expect(
      find.text(
        'These were changed differently on two devices. Settle them first:',
      ),
      findsOneWidget,
    );
    final unsettled = find.descendant(
      of: find.byType(SheetScaffold),
      matching: find.text('猫'),
    );
    await tester.ensureVisible(unsettled);
    await tester.pumpAndSettle();
    await tester.tap(unsettled);
    await tester.pumpAndSettle();

    expect(find.byType(SheetScaffold), findsNothing);
    expect(publishing.publishes, hasLength(1));
  });

  testWidgets('on a phone it is an icon that says the studyset is private', (
    tester,
  ) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    await showStudyset(tester, 'japanese', width: 400);

    expect(find.byTooltip('Share: private'), findsOneWidget);
    await tester.tap(find.byTooltip('Share: private'));
    await tester.pumpAndSettle();
    expect(find.text('Private · only you can see it'), findsOneWidget);
  });

  testWidgets('an anonymous person is told how to publish, and the instance '
      "isn't asked", (tester) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    publishing.fail = Exception('must not be asked');
    await showStudyset(tester, 'japanese', identified: false);

    await openSheet(tester);

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

  testWidgets('without the instance, it says so and tries again', (
    tester,
  ) async {
    stored('japanese', 'Japanese', license: 'CC-BY-4.0');
    publishing.fail = Exception('offline');
    await showStudyset(tester, 'japanese');

    await openSheet(tester);
    expect(find.text("Publishing can't be reached right now."), findsOneWidget);
    publishing.fail = null;
    await tester.tap(find.text('Retry'));
    await tester.pumpAndSettle();

    expect(find.text('Publish v1'), findsOneWidget);
  });
}