import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'package:household_keeper/core/database/database.dart';
import 'package:household_keeper/core/router/router.dart';
import 'package:household_keeper/features/home/domain/daily_plan_models.dart';
import 'package:household_keeper/features/home/presentation/daily_plan_providers.dart';
import 'package:household_keeper/features/rooms/presentation/room_providers.dart';
import 'package:household_keeper/features/tasks/domain/effort_level.dart';
import 'package:household_keeper/features/tasks/domain/frequency.dart';
import 'package:household_keeper/l10n/app_localizations.dart';

/// Helper to create a test [Task] with sensible defaults.
Task _makeTask({
  int id = 1,
  int roomId = 1,
  String name = 'Test Task',
  required DateTime nextDueDate,
}) {
  return Task(
    id: id,
    roomId: roomId,
    name: name,
    intervalType: IntervalType.weekly,
    intervalDays: 7,
    effortLevel: EffortLevel.medium,
    nextDueDate: nextDueDate,
    createdAt: DateTime(2026, 1, 1),
  );
}

/// Helper to create a [TaskWithRoom].
TaskWithRoom _makeTaskWithRoom({
  int id = 1,
  int roomId = 1,
  String taskName = 'Test Task',
  String roomName = 'Kueche',
  required DateTime nextDueDate,
}) {
  return TaskWithRoom(
    task: _makeTask(
      id: id,
      roomId: roomId,
      name: taskName,
      nextDueDate: nextDueDate,
    ),
    roomName: roomName,
    roomId: roomId,
  );
}

/// Build the app with dailyPlanProvider overridden to the given state.
Widget _buildApp(DailyPlanState planState) {
  return ProviderScope(
    overrides: [
      dailyPlanProvider.overrideWith(
        (ref) => Stream.value(planState),
      ),
      roomWithStatsListProvider.overrideWith(
        (ref) => Stream.value([]),
      ),
    ],
    child: MaterialApp.router(
      routerConfig: router,
      localizationsDelegates: AppLocalizations.localizationsDelegates,
      supportedLocales: const [Locale('de')],
      locale: const Locale('de'),
    ),
  );
}

void main() {
  setUp(() {
    SharedPreferences.setMockInitialValues({});
  });

  group('HomeScreen empty states', () {
    testWidgets('shows no-tasks empty state when no tasks exist at all',
        (tester) async {
      await tester.pumpWidget(_buildApp(const DailyPlanState(
        overdueTasks: [],
        todayTasks: [],
        tomorrowTasks: [],
        completedTodayCount: 0,
        totalTodayCount: 0,
      )));
      await tester.pumpAndSettle();

      // Should show "Noch keine Aufgaben angelegt" (dailyPlanNoTasks)
      expect(find.text('Noch keine Aufgaben angelegt'), findsOneWidget);
      // Should show action button to create a room
      expect(find.text('Raum erstellen'), findsOneWidget);
    });

    testWidgets('shows all-clear state when all tasks are done',
        (tester) async {
      await tester.pumpWidget(_buildApp(const DailyPlanState(
        overdueTasks: [],
        todayTasks: [],
        tomorrowTasks: [],
        completedTodayCount: 3,
        totalTodayCount: 3,
      )));
      await tester.pumpAndSettle();

      // Should show celebration empty state
      expect(find.text('Alles erledigt! \u{1F31F}'), findsOneWidget);
      expect(find.byIcon(Icons.celebration_outlined), findsOneWidget);
      // Progress card should show 3/3
      expect(find.text('3 von 3 erledigt'), findsOneWidget);
    });
  });

  group('HomeScreen normal state', () {
    testWidgets('shows progress card with correct counts', (tester) async {
      final now = DateTime.now();
      final today = DateTime(now.year, now.month, now.day);

      await tester.pumpWidget(_buildApp(DailyPlanState(
        overdueTasks: [],
        todayTasks: [
          _makeTaskWithRoom(
            id: 1,
            taskName: 'Staubsaugen',
            roomName: 'Wohnzimmer',
            nextDueDate: today,
          ),
        ],
        tomorrowTasks: [],
        completedTodayCount: 2,
        totalTodayCount: 3,
      )));
      await tester.pumpAndSettle();

      // Progress card should show 2/3
      expect(find.text('2 von 3 erledigt'), findsOneWidget);
      expect(find.byType(LinearProgressIndicator), findsOneWidget);
    });

    testWidgets('shows overdue section when overdue tasks exist',
        (tester) async {
      final now = DateTime.now();
      final today = DateTime(now.year, now.month, now.day);
      final yesterday = today.subtract(const Duration(days: 1));

      await tester.pumpWidget(_buildApp(DailyPlanState(
        overdueTasks: [
          _makeTaskWithRoom(
            id: 1,
            taskName: 'Boden wischen',
            roomName: 'Kueche',
            nextDueDate: yesterday,
          ),
        ],
        todayTasks: [
          _makeTaskWithRoom(
            id: 2,
            taskName: 'Staubsaugen',
            roomName: 'Wohnzimmer',
            nextDueDate: today,
          ),
        ],
        tomorrowTasks: [],
        completedTodayCount: 0,
        totalTodayCount: 2,
      )));
      await tester.pumpAndSettle();

      // Should show overdue section header
      expect(find.text('\u00dcberf\u00e4llig'), findsOneWidget);
      // Should show today section header (may also appear as relative date)
      expect(find.text('Heute'), findsAtLeast(1));
      // Should show both tasks
      expect(find.text('Boden wischen'), findsOneWidget);
      expect(find.text('Staubsaugen'), findsOneWidget);
      // Should show room name tags
      expect(find.text('Kueche'), findsOneWidget);
      expect(find.text('Wohnzimmer'), findsOneWidget);
    });

    testWidgets('shows collapsed tomorrow section with count',
        (tester) async {
      final now = DateTime.now();
      final today = DateTime(now.year, now.month, now.day);
      final tomorrow = today.add(const Duration(days: 1));

      await tester.pumpWidget(_buildApp(DailyPlanState(
        overdueTasks: [],
        todayTasks: [
          _makeTaskWithRoom(
            id: 1,
            taskName: 'Staubsaugen',
            roomName: 'Wohnzimmer',
            nextDueDate: today,
          ),
        ],
        tomorrowTasks: [
          _makeTaskWithRoom(
            id: 2,
            taskName: 'Fenster putzen',
            roomName: 'Schlafzimmer',
            nextDueDate: tomorrow,
          ),
          _makeTaskWithRoom(
            id: 3,
            taskName: 'Bett beziehen',
            roomName: 'Schlafzimmer',
            nextDueDate: tomorrow,
          ),
        ],
        completedTodayCount: 0,
        totalTodayCount: 1,
      )));
      await tester.pumpAndSettle();

      // Should show collapsed tomorrow section with count
      expect(find.text('Demn\u00e4chst (2)'), findsOneWidget);
      // Tomorrow tasks should NOT be visible (collapsed by default)
      expect(find.text('Fenster putzen'), findsNothing);
    });

    testWidgets('today tasks have checkboxes', (tester) async {
      final now = DateTime.now();
      final today = DateTime(now.year, now.month, now.day);

      await tester.pumpWidget(_buildApp(DailyPlanState(
        overdueTasks: [],
        todayTasks: [
          _makeTaskWithRoom(
            id: 1,
            taskName: 'Staubsaugen',
            roomName: 'Wohnzimmer',
            nextDueDate: today,
          ),
        ],
        tomorrowTasks: [],
        completedTodayCount: 0,
        totalTodayCount: 1,
      )));
      await tester.pumpAndSettle();

      // Today task should have a checkbox
      expect(find.byType(Checkbox), findsOneWidget);
    });
  });
}