import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:household_keeper/core/database/database.dart';
import 'package:household_keeper/features/tasks/domain/effort_level.dart';
import 'package:household_keeper/features/tasks/domain/frequency.dart';

void main() {
  late AppDatabase db;
  late int room1Id;
  late int room2Id;

  setUp(() async {
    db = AppDatabase(NativeDatabase.memory());
    room1Id = await db.roomsDao.insertRoom(
      RoomsCompanion.insert(name: 'Kueche', iconName: 'kitchen'),
    );
    room2Id = await db.roomsDao.insertRoom(
      RoomsCompanion.insert(name: 'Badezimmer', iconName: 'bathroom'),
    );
  });

  tearDown(() async {
    await db.close();
  });

  group('CalendarDao.watchTasksForDate', () {
    test('returns empty list when no tasks exist', () async {
      final result = await db.calendarDao
          .watchTasksForDate(DateTime(2026, 3, 16))
          .first;
      expect(result, isEmpty);
    });

    test('returns only tasks due on the queried date', () async {
      // Task due on March 16
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Abspuelen',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 16, 9, 30),
      ));
      // Task due on March 15 (should NOT appear)
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Staubsaugen',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.medium,
        nextDueDate: DateTime(2026, 3, 15),
      ));
      // Task due on March 17 (should NOT appear)
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Fenster putzen',
        intervalType: IntervalType.monthly,
        effortLevel: EffortLevel.high,
        nextDueDate: DateTime(2026, 3, 17),
      ));

      final result = await db.calendarDao
          .watchTasksForDate(DateTime(2026, 3, 16))
          .first;
      expect(result.length, 1);
      expect(result.first.task.name, 'Abspuelen');
    });

    test('returns tasks from multiple rooms with correct room pairing',
        () async {
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Kueche Aufgabe',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 20),
      ));
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room2Id,
        name: 'Bad Aufgabe',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.medium,
        nextDueDate: DateTime(2026, 3, 20, 14),
      ));

      final result = await db.calendarDao
          .watchTasksForDate(DateTime(2026, 3, 20))
          .first;
      expect(result.length, 2);

      final names = result.map((t) => t.task.name).toList();
      expect(names, contains('Kueche Aufgabe'));
      expect(names, contains('Bad Aufgabe'));

      final kuecheTask =
          result.firstWhere((t) => t.task.name == 'Kueche Aufgabe');
      expect(kuecheTask.roomName, 'Kueche');
      expect(kuecheTask.roomId, room1Id);

      final badTask =
          result.firstWhere((t) => t.task.name == 'Bad Aufgabe');
      expect(badTask.roomName, 'Badezimmer');
      expect(badTask.roomId, room2Id);
    });

    test('returns tasks sorted alphabetically by name', () async {
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Zitrone putzen',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 18),
      ));
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Abspuelen',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 18, 10),
      ));
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room2Id,
        name: 'Moppen',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.medium,
        nextDueDate: DateTime(2026, 3, 18, 8),
      ));

      final result = await db.calendarDao
          .watchTasksForDate(DateTime(2026, 3, 18))
          .first;
      expect(result.length, 3);
      expect(result[0].task.name, 'Abspuelen');
      expect(result[1].task.name, 'Moppen');
      expect(result[2].task.name, 'Zitrone putzen');
    });

    test('does NOT include overdue carry-over for past dates', () async {
      // Task due on March 10 (overdue relative to March 16)
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Alte Aufgabe',
        intervalType: IntervalType.monthly,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 10),
      ));
      // Task due on March 15 (queried date)
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Richtige Aufgabe',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 15),
      ));

      // Querying March 15 should only return the task due on March 15
      final result = await db.calendarDao
          .watchTasksForDate(DateTime(2026, 3, 15))
          .first;
      expect(result.length, 1);
      expect(result.first.task.name, 'Richtige Aufgabe');
    });
  });

  group('CalendarDao.watchOverdueTasks', () {
    test('returns empty list when no overdue tasks exist', () async {
      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result, isEmpty);
    });

    test('returns tasks whose nextDueDate is before referenceDate', () async {
      // Task due March 15 — overdue relative to March 16
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Ueberfaelliges Task',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 15),
      ));
      // Task due March 10 — also overdue
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Sehr altes Task',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.medium,
        nextDueDate: DateTime(2026, 3, 10),
      ));

      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result.length, 2);
    });

    test('does NOT include tasks due ON the referenceDate', () async {
      // Task due exactly on reference date (March 16) — should NOT appear
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Heutiges Task',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 16),
      ));
      // Task due yesterday (March 15) — should appear
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Gestriges Task',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 15),
      ));

      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result.length, 1);
      expect(result.first.task.name, 'Gestriges Task');
    });

    test('does NOT include tasks due in the future', () async {
      // Future task — should NOT appear
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Zukuenftiges Task',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 20),
      ));

      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result, isEmpty);
    });

    test('returns overdue tasks sorted by nextDueDate ascending', () async {
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Neues Overdue',
        intervalType: IntervalType.daily,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 15),
      ));
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room1Id,
        name: 'Altes Overdue',
        intervalType: IntervalType.monthly,
        effortLevel: EffortLevel.medium,
        nextDueDate: DateTime(2026, 3, 1),
      ));
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room2Id,
        name: 'Mittleres Overdue',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 10),
      ));

      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result.length, 3);
      expect(result[0].task.name, 'Altes Overdue');
      expect(result[1].task.name, 'Mittleres Overdue');
      expect(result[2].task.name, 'Neues Overdue');
    });

    test('returns overdue task with correct room pairing', () async {
      await db.tasksDao.insertTask(TasksCompanion.insert(
        roomId: room2Id,
        name: 'Bad Overdue',
        intervalType: IntervalType.weekly,
        effortLevel: EffortLevel.low,
        nextDueDate: DateTime(2026, 3, 14),
      ));

      final result = await db.calendarDao
          .watchOverdueTasks(DateTime(2026, 3, 16))
          .first;
      expect(result.length, 1);
      expect(result.first.task.name, 'Bad Overdue');
      expect(result.first.roomName, 'Badezimmer');
      expect(result.first.roomId, room2Id);
    });
  });
}