import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:hive_flutter/hive_flutter.dart';
import 'package:intl/intl.dart';
import '../../../data/services/myquran_sholat_service.dart';
import '../../../data/services/prayer_service.dart';
import '../../../data/services/location_service.dart';
import '../../../data/local/hive_boxes.dart';
import '../../../data/local/models/app_settings.dart';

/// Represents a single prayer time entry.
class PrayerTimeEntry {
  final String name;
  final String time; // "HH:mm"
  final bool isActive;
  PrayerTimeEntry({
    required this.name,
    required this.time,
    this.isActive = false,
  });
}

/// Full day prayer schedule from myQuran API.
class DaySchedule {
  final String cityName;
  final String province;
  final String date; // yyyy-MM-dd
  final String tanggal; // formatted date from API
  final Map<String, String> times; // {imsak, subuh, terbit, dhuha, dzuhur, ashar, maghrib, isya}

  DaySchedule({
    required this.cityName,
    required this.province,
    required this.date,
    required this.tanggal,
    required this.times,
  });

  /// Is this schedule for tomorrow?
  bool get isTomorrow {
    final todayStr = DateFormat('yyyy-MM-dd').format(DateTime.now());
    return date.compareTo(todayStr) > 0;
  }

  /// Get prayer time entries as a list.
  List<PrayerTimeEntry> get prayerList {
    final now = DateTime.now();
    final formatter = DateFormat('HH:mm');
    final currentTime = formatter.format(now);

    final prayers = [
      PrayerTimeEntry(name: 'Imsak', time: times['imsak'] ?? '-'),
      PrayerTimeEntry(name: 'Subuh', time: times['subuh'] ?? '-'),
      PrayerTimeEntry(name: 'Terbit', time: times['terbit'] ?? '-'),
      PrayerTimeEntry(name: 'Dhuha', time: times['dhuha'] ?? '-'),
      PrayerTimeEntry(name: 'Dzuhur', time: times['dzuhur'] ?? '-'),
      PrayerTimeEntry(name: 'Ashar', time: times['ashar'] ?? '-'),
      PrayerTimeEntry(name: 'Maghrib', time: times['maghrib'] ?? '-'),
      PrayerTimeEntry(name: 'Isya', time: times['isya'] ?? '-'),
    ];

    // Find the next prayer
    int activeIndex = -1;
    if (isTomorrow) {
      // User specifically requested to show tomorrow's Subuh as upcoming
      activeIndex = 1; // 0=Imsak, 1=Subuh
    } else {
      for (int i = 0; i < prayers.length; i++) {
        if (prayers[i].time != '-' && prayers[i].time.compareTo(currentTime) > 0) {
          activeIndex = i;
          break;
        }
      }
    }

    if (activeIndex >= 0) {
      prayers[activeIndex] = PrayerTimeEntry(
        name: prayers[activeIndex].name,
        time: prayers[activeIndex].time,
        isActive: true,
      );
    }

    return prayers;
  }

  /// Get the next prayer name and time.
  PrayerTimeEntry? get nextPrayer {
    final list = prayerList;
    for (final p in list) {
      if (p.isActive) return p;
    }
    // If none active and it's today, all prayers have passed
    return null;
  }
}

/// Default Jakarta city ID from myQuran API.
const _defaultCityId = '58a2fc6ed39fd083f55d4182bf88826d';

/// Provider for the user's selected city ID (stored in Hive settings).
final selectedCityIdProvider = StateProvider<String>((ref) {
  final box = Hive.box<AppSettings>(HiveBoxes.settings);
  final settings = box.get('default');
  final stored = settings?.lastCityName ?? '';
  if (stored.contains('|')) {
    return stored.split('|').last;
  }
  return _defaultCityId;
});

/// Provider for today's prayer times using myQuran API.
final prayerTimesProvider = FutureProvider<DaySchedule?>((ref) async {
  final cityId = ref.watch(selectedCityIdProvider);
  final today = DateFormat('yyyy-MM-dd').format(DateTime.now());

  DaySchedule? schedule;

  // Try API first
  final jadwal =
      await MyQuranSholatService.instance.getDailySchedule(cityId, today);

  if (jadwal != null) {
    final cityInfo = await MyQuranSholatService.instance.getCityInfo(cityId);
    schedule = DaySchedule(
      cityName: cityInfo?['kabko'] ?? 'Jakarta',
      province: cityInfo?['prov'] ?? 'DKI Jakarta',
      date: today,
      tanggal: jadwal['tanggal'] ?? today,
      times: jadwal,
    );
  }

  // Check if all prayers today have passed
  if (schedule != null && !schedule.isTomorrow && schedule.nextPrayer == null) {
    // All prayers passed, fetch tomorrow's schedule
    final tomorrow = DateTime.now().add(const Duration(days: 1));
    final tomorrowStr = DateFormat('yyyy-MM-dd').format(tomorrow);
    
    final tmrwJadwal = 
        await MyQuranSholatService.instance.getDailySchedule(cityId, tomorrowStr);
        
    if (tmrwJadwal != null) {
      final cityInfo = await MyQuranSholatService.instance.getCityInfo(cityId);
      schedule = DaySchedule(
        cityName: cityInfo?['kabko'] ?? 'Jakarta',
        province: cityInfo?['prov'] ?? 'DKI Jakarta',
        date: tomorrowStr,
        tanggal: tmrwJadwal['tanggal'] ?? tomorrowStr,
        times: tmrwJadwal,
      );
    }
  }

  if (schedule != null) {
    return schedule;
  }

  // Fallback to adhan package
  final position = await LocationService.instance.getCurrentLocation();
  double lat = position?.latitude ?? -6.2088;
  double lng = position?.longitude ?? 106.8456;

  final result = PrayerService.instance.getPrayerTimes(lat, lng, DateTime.now());
  if (result != null) {
    final timeFormat = DateFormat('HH:mm');
    return DaySchedule(
      cityName: 'Jakarta',
      province: 'DKI Jakarta',
      date: today,
      tanggal: DateFormat('EEEE, dd/MM/yyyy').format(DateTime.now()),
      times: {
        'imsak': timeFormat.format(result.fajr.subtract(const Duration(minutes: 10))),
        'subuh': timeFormat.format(result.fajr),
        'terbit': timeFormat.format(result.sunrise),
        'dhuha': timeFormat.format(result.sunrise.add(const Duration(minutes: 15))),
        'dzuhur': timeFormat.format(result.dhuhr),
        'ashar': timeFormat.format(result.asr),
        'maghrib': timeFormat.format(result.maghrib),
        'isya': timeFormat.format(result.isha),
      },
    );
  }

  return null;
});

/// Provider for monthly prayer schedule (for Imsakiyah screen).
final monthlyScheduleProvider =
    FutureProvider.family<Map<String, Map<String, String>>, String>(
        (ref, month) async {
  final cityId = ref.watch(selectedCityIdProvider);
  return MyQuranSholatService.instance.getMonthlySchedule(cityId, month);
});

/// Provider for current city name.
final cityNameProvider = FutureProvider<String>((ref) async {
  final box = Hive.box<AppSettings>(HiveBoxes.settings);
  final settings = box.get('default');
  final stored = settings?.lastCityName ?? '';
  if (stored.contains('|')) {
    return stored.split('|').first;
  }
  
  final cityId = ref.watch(selectedCityIdProvider);
  final info = await MyQuranSholatService.instance.getCityInfo(cityId);
  if (info != null) {
    return '${info['kabko']}, ${info['prov']}';
  }
  return 'Kota Jakarta, DKI Jakarta';
});