import 'package:flutter/foundation.dart';
import '../models/supplement.dart';
import '../models/supplement_intake.dart';
import '../services/database_helper.dart';
import '../services/notification_service.dart';

class SupplementProvider with ChangeNotifier {
  final DatabaseHelper _databaseHelper = DatabaseHelper.instance;
  final NotificationService _notificationService = NotificationService();

  List<Supplement> _supplements = [];
  List<Map<String, dynamic>> _todayIntakes = [];
  List<Map<String, dynamic>> _monthlyIntakes = [];
  bool _isLoading = false;

  List<Supplement> get supplements => _supplements;
  List<Map<String, dynamic>> get todayIntakes => _todayIntakes;
  List<Map<String, dynamic>> get monthlyIntakes => _monthlyIntakes;
  bool get isLoading => _isLoading;

  Future<void> initialize() async {
    await _notificationService.initialize();
    await _notificationService.requestPermissions();
    await loadSupplements();
    await loadTodayIntakes();
  }

  Future<void> loadSupplements() async {
    _isLoading = true;
    notifyListeners();

    try {
      print('Loading supplements from database...');
      _supplements = await _databaseHelper.getAllSupplements();
      print('Loaded ${_supplements.length} supplements');
      for (var supplement in _supplements) {
        print('Supplement: ${supplement.name}');
      }
    } catch (e) {
      print('Error loading supplements: $e');
      if (kDebugMode) {
        print('Error loading supplements: $e');
      }
    } finally {
      _isLoading = false;
      notifyListeners();
    }
  }

  Future<void> addSupplement(Supplement supplement) async {
    try {
      print('Adding supplement: ${supplement.name}');
      final id = await _databaseHelper.insertSupplement(supplement);
      print('Supplement inserted with ID: $id');
      final newSupplement = supplement.copyWith(id: id);
      
      // Schedule notifications (skip if there's an error)
      try {
        await _notificationService.scheduleSupplementReminders(newSupplement);
        print('Notifications scheduled');
      } catch (notificationError) {
        print('Warning: Could not schedule notifications: $notificationError');
      }
      
      await loadSupplements();
      print('Supplements reloaded, count: ${_supplements.length}');
    } catch (e) {
      print('Error adding supplement: $e');
      if (kDebugMode) {
        print('Error adding supplement: $e');
      }
      rethrow;
    }
  }

  Future<void> updateSupplement(Supplement supplement) async {
    try {
      await _databaseHelper.updateSupplement(supplement);
      
      // Reschedule notifications
      await _notificationService.scheduleSupplementReminders(supplement);
      
      await loadSupplements();
    } catch (e) {
      if (kDebugMode) {
        print('Error updating supplement: $e');
      }
    }
  }

  Future<void> deleteSupplement(int id) async {
    try {
      await _databaseHelper.deleteSupplement(id);
      
      // Cancel notifications
      await _notificationService.cancelSupplementReminders(id);
      
      await loadSupplements();
    } catch (e) {
      if (kDebugMode) {
        print('Error deleting supplement: $e');
      }
    }
  }

  Future<void> recordIntake(int supplementId, double dosage, {int? unitsTaken, String? notes}) async {
    try {
      final intake = SupplementIntake(
        supplementId: supplementId,
        takenAt: DateTime.now(),
        dosageTaken: dosage,
        unitsTaken: unitsTaken ?? 1,
        notes: notes,
      );

      await _databaseHelper.insertIntake(intake);
      await loadTodayIntakes();
      
      // Show confirmation notification
      final supplement = _supplements.firstWhere((s) => s.id == supplementId);
      final unitsText = unitsTaken != null && unitsTaken > 1 ? '$unitsTaken ${supplement.unitType}' : '';
      await _notificationService.showInstantNotification(
        'Supplement Taken',
        'Recorded ${supplement.name}${unitsText.isNotEmpty ? ' - $unitsText' : ''} ($dosage ${supplement.unit})',
      );
    } catch (e) {
      if (kDebugMode) {
        print('Error recording intake: $e');
      }
    }
  }

  Future<void> loadTodayIntakes() async {
    try {
      _todayIntakes = await _databaseHelper.getIntakesWithSupplementsForDate(DateTime.now());
      notifyListeners();
    } catch (e) {
      if (kDebugMode) {
        print('Error loading today\'s intakes: $e');
      }
    }
  }

  Future<void> loadMonthlyIntakes(int year, int month) async {
    try {
      _monthlyIntakes = await _databaseHelper.getIntakesWithSupplementsForMonth(year, month);
      notifyListeners();
    } catch (e) {
      if (kDebugMode) {
        print('Error loading monthly intakes: $e');
      }
    }
  }

  Future<List<Map<String, dynamic>>> getIntakesForDate(DateTime date) async {
    try {
      return await _databaseHelper.getIntakesWithSupplementsForDate(date);
    } catch (e) {
      if (kDebugMode) {
        print('Error loading intakes for date: $e');
      }
      return [];
    }
  }

  Future<void> deleteIntake(int intakeId) async {
    try {
      await _databaseHelper.deleteIntake(intakeId);
      await loadTodayIntakes();
    } catch (e) {
      if (kDebugMode) {
        print('Error deleting intake: $e');
      }
    }
  }
}