import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import '../models/alarm_model.dart';
import '../core/notification_service.dart';
import 'package:uuid/uuid.dart';

class AlarmsScreen extends ConsumerStatefulWidget {
  const AlarmsScreen({super.key});

  @override
  ConsumerState<AlarmsScreen> createState() => _AlarmsScreenState();
}

class _AlarmsScreenState extends ConsumerState<AlarmsScreen> {
  List<AlarmModel> _alarms = [];
  bool _isLoading = true;

  @override
  void initState() {
    super.initState();
    _loadAlarms();
  }

  Future<void> _loadAlarms() async {
    setState(() => _isLoading = true);
    // TODO: Загрузить из Firestore/Hive
    setState(() {
      _alarms = [];
      _isLoading = false;
    });
  }

  Future<void> _toggleAlarm(AlarmModel alarm) async {
    final updated = alarm.copyWith(isEnabled: !alarm.isEnabled);
    setState(() {
      final index = _alarms.indexWhere((a) => a.id == alarm.id);
      if (index != -1) {
        _alarms[index] = updated;
      }
    });

    if (updated.isEnabled) {
      await notificationService.scheduleNotification(
        id: updated.hashCode,
        title: updated.title,
        body: 'Напоминание: ${updated.title}',
        scheduledDate: updated.dateTime,
      );
    } else {
      await notificationService.cancelNotification(updated.hashCode);
    }
  }

  Future<void> _deleteAlarm(String id) async {
    final alarm = _alarms.firstWhere((a) => a.id == id);
    await notificationService.cancelNotification(alarm.hashCode);

    setState(() {
      _alarms.removeWhere((a) => a.id == id);
    });
  }

  Future<void> _showAddAlarmDialog() async {
    final titleController = TextEditingController();
    DateTime selectedDate = DateTime.now();
    TimeOfDay selectedTime = TimeOfDay.now();

    await showDialog(
      context: context,
      builder: (context) => StatefulBuilder(
        builder: (context, setDialogState) => AlertDialog(
          title: const Text('Новый будильник'),
          content: SingleChildScrollView(
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                TextField(
                  controller: titleController,
                  decoration: const InputDecoration(
                    labelText: 'Название',
                    border: OutlineInputBorder(),
                  ),
                ),
                const SizedBox(height: 16),
                ListTile(
                  leading: const Icon(Icons.calendar_today),
                  title: const Text('Дата'),
                  subtitle: Text(
                    '${selectedDate.day}.${selectedDate.month}.${selectedDate.year}',
                  ),
                  trailing: const Icon(Icons.arrow_forward_ios, size: 16),
                  onTap: () async {
                    final picked = await showDatePicker(
                      context: context,
                      initialDate: selectedDate,
                      firstDate: DateTime.now(),
                      lastDate: DateTime.now().add(const Duration(days: 365)),
                    );
                    if (picked != null) {
                      setDialogState(() => selectedDate = picked);
                    }
                  },
                ),
                ListTile(
                  leading: const Icon(Icons.access_time),
                  title: const Text('Время'),
                  subtitle: Text(selectedTime.format(context)),
                  trailing: const Icon(Icons.arrow_forward_ios, size: 16),
                  onTap: () async {
                    final picked = await showTimePicker(
                      context: context,
                      initialTime: selectedTime,
                    );
                    if (picked != null) {
                      setDialogState(() => selectedTime = picked);
                    }
                  },
                ),
              ],
            ),
          ),
          actions: [
            TextButton(
              onPressed: () => Navigator.pop(context),
              child: const Text('Отмена'),
            ),
            ElevatedButton(
              onPressed: () {
                if (titleController.text.isEmpty) return;

                final dateTime = DateTime(
                  selectedDate.year,
                  selectedDate.month,
                  selectedDate.day,
                  selectedTime.hour,
                  selectedTime.minute,
                );

                final alarm = AlarmModel(
                  id: const Uuid().v4(),
                  title: titleController.text,
                  dateTime: dateTime,
                  isEnabled: true,
                  createdAt: DateTime.now(),
                  updatedAt: DateTime.now(),
                );

                setState(() {
                  _alarms.add(alarm);
                });

                notificationService.scheduleNotification(
                  id: alarm.hashCode,
                  title: alarm.title,
                  body: 'Будильник: ${alarm.title}',
                  scheduledDate: alarm.dateTime,
                );

                Navigator.pop(context);
              },
              child: const Text('Создать'),
            ),
          ],
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return const Scaffold(
        body: Center(child: CircularProgressIndicator()),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('Будильники'),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _loadAlarms,
            tooltip: 'Обновить',
          ),
        ],
      ),
      body: _alarms.isEmpty
          ? _buildEmptyState()
          : ListView.builder(
              padding: const EdgeInsets.all(16),
              itemCount: _alarms.length,
              itemBuilder: (context, index) {
                final alarm = _alarms[index];
                return _buildAlarmCard(alarm);
              },
            ),
      floatingActionButton: FloatingActionButton(
        onPressed: _showAddAlarmDialog,
        child: const Icon(Icons.add),
      ),
    );
  }

  Widget _buildEmptyState() {
    return Center(
      child: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          Icon(Icons.alarm, size: 100, color: Colors.grey[400]),
          const SizedBox(height: 24),
          Text(
            'Нет будильников',
            style: TextStyle(fontSize: 20, color: Colors.grey[600]),
          ),
          const SizedBox(height: 8),
          Text(
            'Создайте первый будильник',
            style: TextStyle(color: Colors.grey[500]),
          ),
        ],
      ),
    );
  }

  Widget _buildAlarmCard(AlarmModel alarm) {
    return Card(
      margin: const EdgeInsets.only(bottom: 12),
      child: ListTile(
        leading: Icon(
          alarm.isEnabled ? Icons.alarm : Icons.alarm_off,
          color: alarm.isEnabled ? Colors.blue : Colors.grey,
        ),
        title: Text(
          alarm.title,
          style: TextStyle(
            fontWeight: FontWeight.bold,
            color: alarm.isEnabled ? null : Colors.grey,
          ),
        ),
        subtitle: Text(
          '${alarm.dateTime.day}.${alarm.dateTime.month}.${alarm.dateTime.year} '
          '${alarm.dateTime.hour.toString().padLeft(2, '0')}:'
          '${alarm.dateTime.minute.toString().padLeft(2, '0')}',
        ),
        trailing: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Switch(
              value: alarm.isEnabled,
              onChanged: (_) => _toggleAlarm(alarm),
            ),
            IconButton(
              icon: const Icon(Icons.delete, color: Colors.red),
              onPressed: () => _deleteAlarm(alarm.id),
            ),
          ],
        ),
      ),
    );
  }
}