import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:hive_flutter/hive_flutter.dart';
import '../models/user_profile.dart';
import '../models/cycle_entry.dart';

import 'package:uuid/uuid.dart';
import '../services/cycle_service.dart';

/// Provider for the user profile
final userProfileProvider =
    StateNotifierProvider<UserProfileNotifier, UserProfile?>((ref) {
  return UserProfileNotifier();
});

/// Notifier for the user profile
class UserProfileNotifier extends StateNotifier<UserProfile?> {
  UserProfileNotifier() : super(null) {
    _loadProfile();
  }

  void _loadProfile() {
    final box = Hive.box<UserProfile>('user_profile');
    state = box.get('current_user');
  }

  Future<void> updateProfile(UserProfile profile) async {
    final box = Hive.box<UserProfile>('user_profile');
    await box.put('current_user', profile);
    state = profile;
  }

  Future<void> updateThemeMode(AppThemeMode themeMode) async {
    if (state != null) {
      await updateProfile(state!.copyWith(themeMode: themeMode));
    }
  }

  Future<void> updateAccentColor(String accentColor) async {
    if (state != null) {
      await updateProfile(state!.copyWith(accentColor: accentColor));
    }
  }

  Future<void> updateRelationshipStatus(
      RelationshipStatus relationshipStatus) async {
    if (state != null) {
      await updateProfile(
          state!.copyWith(relationshipStatus: relationshipStatus));
    }
  }

  Future<void> clearProfile() async {
    final box = Hive.box<UserProfile>('user_profile');
    await box.clear();
    state = null;
  }
}

/// Provider for cycle entries
final cycleEntriesProvider =
    StateNotifierProvider<CycleEntriesNotifier, List<CycleEntry>>((ref) {
  return CycleEntriesNotifier();
});

/// Notifier for cycle entries
class CycleEntriesNotifier extends StateNotifier<List<CycleEntry>> {
  CycleEntriesNotifier() : super([]) {
    _loadEntries();
  }

  void _loadEntries() {
    final box = Hive.box<CycleEntry>('cycle_entries');
    state = box.values.toList()..sort((a, b) => b.date.compareTo(a.date));
  }

  Future<void> addEntry(CycleEntry entry) async {
    final box = Hive.box<CycleEntry>('cycle_entries');
    await box.put(entry.id, entry);
    _loadEntries();
  }

  Future<void> updateEntry(CycleEntry entry) async {
    final box = Hive.box<CycleEntry>('cycle_entries');
    await box.put(entry.id, entry);
    _loadEntries();
  }

  Future<void> deleteEntry(String id) async {
    final box = Hive.box<CycleEntry>('cycle_entries');
    await box.delete(id);
    _loadEntries();
  }

  Future<void> deleteEntriesForMonth(int year, int month) async {
    final box = Hive.box<CycleEntry>('cycle_entries');
    final keysToDelete = <dynamic>[];
    for (var entry in box.values) {
      if (entry.date.year == year && entry.date.month == month) {
        keysToDelete.add(entry.key);
      }
    }
    await box.deleteAll(keysToDelete);
    _loadEntries();
  }

  Future<void> clearEntries() async {
    final box = Hive.box<CycleEntry>('cycle_entries');
    await box.clear();
    state = [];
  }

  Future<void> generateExampleData(String userId) async {
    await clearEntries();
    final box = Hive.box<CycleEntry>('cycle_entries');
    final today = DateTime.now();

    // Generate 3 past cycles (~28 days each)
    DateTime cycleStart = today.subtract(const Duration(days: 84)); // 3 * 28

    while (cycleStart.isBefore(today)) {
      // Create Period (5 days)
      for (int i = 0; i < 5; i++) {
        final date = cycleStart.add(Duration(days: i));
        if (date.isAfter(today)) break;

        final isHeavy = i == 1 || i == 2;
        final entry = CycleEntry(
          id: const Uuid().v4(),
          date: date,
          isPeriodDay: true,
          flowIntensity: isHeavy ? FlowIntensity.heavy : FlowIntensity.medium,
          mood: i == 1 ? MoodLevel.sad : null,
          crampIntensity: i == 0 ? 3 : null,
          hasHeadache: i == 0,
          createdAt: date,
          updatedAt: date,
        );
        await box.put(entry.id, entry);
      }

      // Add random ovulation symptoms near day 14
      final ovulationDay = cycleStart.add(const Duration(days: 14));
      if (ovulationDay.isBefore(today)) {
        final entry = CycleEntry(
          id: const Uuid().v4(),
          date: ovulationDay,
          isPeriodDay: false,
          energyLevel: 4, // High energy
          mood: MoodLevel.veryHappy,
          createdAt: ovulationDay,
          updatedAt: ovulationDay,
        );
        await box.put(entry.id, entry);
      }

      cycleStart = cycleStart.add(const Duration(days: 28));
    }

    _loadEntries();
  }
}

/// Computed provider for current cycle info
final currentCycleInfoProvider = Provider((ref) {
  final user = ref.watch(userProfileProvider);
  final entries = ref.watch(cycleEntriesProvider);
  return CycleService.calculateCycleInfo(user, entries);
});