import 'package:flutter/services.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:halkyon_learn_flutter/src/core/device_settings/model/device_settings.dart';
import 'package:halkyon_learn_flutter/src/core/router/route_paths.dart';
import 'package:halkyon_learn_flutter/src/feature/assistant/model/connected_assistant.dart';
import 'package:halkyon_learn_flutter/src/feature/assistant/widget/connect_claude_screen.dart';
import 'package:halkyon_learn_flutter/src/feature/settings/widget/settings_screen.dart';
import 'package:material_ui/material_ui.dart';

import '../../support/fake_assistant_gateway.dart';
import '../../support/pump_app.dart';
import '../../support/test_dependencies.dart';

void main() {
  late FakeAssistantGateway gateway;

  setUp(() {
    gateway = FakeAssistantGateway(
      initially: [
        ConnectedAssistant(
          id: 1,
          name: 'Claude',
          host: 'claude.ai',
          connectedAt: DateTime.utc(2026, 10, 9),
          lastUsedAt: DateTime.utc(2026, 10, 10),
        ),
      ],
    );
  });

  Future<void> showApp(
    WidgetTester tester, {
    String location = RoutePaths.connectAssistant,
    bool on = true,
  }) async {
    tester.view.physicalSize = const Size(400, 1000);
    tester.view.devicePixelRatio = 1;
    addTearDown(tester.view.reset);
    await pumpApp(
      tester,
      testDependencies(
        assistantGateway: gateway,
        deviceSettings: DeviceSettings(assistant: on),
      ),
      location: location,
    );
    await tester.pumpAndSettle();
  }

  /// Brings [finder] in Settings into view.
  Future<void> scrollTo(WidgetTester tester, Finder finder) async {
    await tester.scrollUntilVisible(
      finder,
      200,
      scrollable: find
          .descendant(
            of: find.byType(SettingsScreen),
            matching: find.byType(Scrollable),
          )
          .first,
    );
    await tester.ensureVisible(finder);
    await tester.pumpAndSettle();
  }

  testWidgets('Settings offers to connect Claude only while asking Claude is '
      'on', (tester) async {
    await showApp(tester, location: RoutePaths.settings, on: false);
    await scrollTo(tester, find.text('Ask an AI assistant or search the web'));
    expect(find.text('Connect Claude'), findsNothing);

    await tester.tap(find.text('Ask an AI assistant or search the web'));
    await tester.pumpAndSettle();
    await scrollTo(tester, find.text('Connect Claude'));
    await tester.tap(find.text('Connect Claude'));
    await tester.pumpAndSettle();

    expect(find.byType(ConnectClaudeScreen), findsOneWidget);
  });

  testWidgets("shows the connector's address to add in Claude, to copy", (
    tester,
  ) async {
    final copied = <Object?>[];
    tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
      SystemChannels.platform,
      (call) async {
        if (call.method == 'Clipboard.setData') {
          copied.add((call.arguments as Map)['text']);
        }
        return null;
      },
    );
    addTearDown(
      () => tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
        SystemChannels.platform,
        null,
      ),
    );
    await showApp(tester);

    expect(find.text('https://learn.example.org/mcp'), findsOneWidget);
    expect(find.textContaining('learn.example.org through'), findsOneWidget);
    await tester.tap(find.byTooltip('Copy'));
    await tester.pumpAndSettle();

    expect(copied, ['https://learn.example.org/mcp']);
    expect(find.text('Copied'), findsOneWidget);
  });

  testWidgets('shows a code on asking, and a new one replaces it', (
    tester,
  ) async {
    await showApp(tester);

    await tester.tap(find.text('Show a code'));
    await tester.pumpAndSettle();
    expect(find.text('K7QX-M2P0'), findsOneWidget);
    expect(find.textContaining('Valid until'), findsOneWidget);

    await tester.tap(find.text('New code'));
    await tester.pumpAndSettle();
    expect(find.text('K7QX-M2P0'), findsNothing);
    expect(find.text('K7QX-M2P1'), findsOneWidget);
  });

  testWidgets('lists what is connected; disconnecting asks first', (
    tester,
  ) async {
    await showApp(tester);
    expect(find.text('Claude'), findsOneWidget);
    expect(find.textContaining('claude.ai'), findsOneWidget);

    await tester.tap(find.widgetWithText(TextButton, 'Disconnect'));
    await tester.pumpAndSettle();
    expect(find.text('Disconnect Claude?'), findsOneWidget);
    await tester.tap(find.widgetWithText(FilledButton, 'Disconnect'));
    await tester.pumpAndSettle();

    expect(gateway.connected, isEmpty);
    expect(find.text('Nothing connected yet.'), findsOneWidget);
  });

  testWidgets('an instance without a connector says so, and shows no steps', (
    tester,
  ) async {
    gateway = FakeAssistantGateway(url: null);
    await showApp(tester);

    expect(find.textContaining("doesn't offer a connector"), findsOneWidget);
    expect(find.text('Show a code'), findsNothing);
  });

  testWidgets('an instance out of reach says so, and asks again on Try '
      'again', (tester) async {
    gateway.unreachable = true;
    await showApp(tester);
    expect(find.textContaining("can't be reached"), findsOneWidget);

    gateway.unreachable = false;
    await tester.tap(find.text('Try again'));
    await tester.pumpAndSettle();

    expect(find.textContaining("can't be reached"), findsNothing);
    expect(find.text('https://learn.example.org/mcp'), findsOneWidget);
  });
}