import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

final notifications = FlutterLocalNotificationsPlugin();

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  const androidSettings = AndroidInitializationSettings('@mipmap/ic_launcher');
  const settings = InitializationSettings(android: androidSettings);
  await notifications.initialize(settings);
  await notifications.resolvePlatformSpecificImplementation<AndroidFlutterLocalNotificationsPlugin>()?.requestNotificationsPermission();
  runApp(const TimerApp());
}

class TimerApp extends StatelessWidget {
  const TimerApp({super.key});

  @override
  Widget build(BuildContext context) => MaterialApp(
        theme: ThemeData(useMaterial3: true, colorScheme: ColorScheme.fromSeed(
          seedColor: Colors.deepPurple,
          brightness: Brightness.light,
        )),
        home: const TimerScreen(),
      );
}

class TimerScreen extends StatefulWidget {
  const TimerScreen({super.key});

  @override
  State<TimerScreen> createState() => _TimerScreenState();
}

class _TimerScreenState extends State<TimerScreen> {
  int duration = 60;
  int remaining = 60;
  Timer? timer;
  bool isRunning = false;

  void _showNotification() async {
    const androidDetails = AndroidNotificationDetails(
      'timer_channel',
      'Таймер',
      channelDescription: 'Уведомления таймера',
      importance: Importance.high,
      priority: Priority.high,
    );
    const details = NotificationDetails(android: androidDetails);
    await notifications.show(0, 'Таймер завершён!', 'Время вышло.', details);
  }

  void _startTimer() {
    setState(() => isRunning = true);
    timer = Timer.periodic(const Duration(seconds: 1), (_) {
      if (remaining > 0) {
        setState(() => remaining--);
      } else {
        timer?.cancel();
        _showNotification();
        setState(() => isRunning = false);
      }
    });
  }

  void _pauseTimer() {
    timer?.cancel();
    setState(() => isRunning = false);
  }

  void _resetTimer() {
    timer?.cancel();
    setState(() {
      isRunning = false;
      remaining = duration;
    });
  }

  void _selectDuration() {
    showModalBottomSheet(
      context: context,
      builder: (_) => Column(
        mainAxisSize: MainAxisSize.min,
        children: [1, 5, 10, 15, 30, 60].map((m) {
          return ListTile(
            title: Text('$m мин'),
            onTap: () {
              setState(() {
                duration = m * 60;
                remaining = duration;
              });
              Navigator.pop(context);
            },
          );
        }).toList(),
      ),
    );
  }

  @override
  void dispose() {
    timer?.cancel();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    final minutes = (remaining / 60).floor();
    final seconds = remaining % 60;
    final progress = duration > 0 ? (remaining / duration) as double : 0.0;

    return Scaffold(
      appBar: AppBar(title: const Text('Таймер')),
      body: Column(
        mainAxisAlignment: MainAxisAlignment.center,
        children: [
          GestureDetector(
            onTap: _selectDuration,
            child: Stack(
              alignment: Alignment.center,
              children: [
                SizedBox(
                  width: 200,
                  height: 200,
                  child: CircularProgressIndicator(
                    value: progress,
                    strokeWidth: 8,
                  ),
                ),
                Text(
                  '${minutes.toString().padLeft(2, '0')}:${seconds.toString().padLeft(2, '0')}',
                  style: Theme.of(context).textTheme.displayMedium,
                ),
              ],
            ),
          ),
          const SizedBox(height: 40),
          Row(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              FloatingActionButton(
                onPressed: isRunning ? _pauseTimer : _startTimer,
                child: Icon(isRunning ? Icons.pause : Icons.play_arrow),
              ),
              if (remaining != duration) ...[
                const SizedBox(width: 16),
                OutlinedButton(onPressed: _resetTimer, child: const Text('Сброс')),
              ],
            ],
          ),
        ],
      ),
    );
  }
}