import 'dart:async';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:latlong2/latlong.dart';
import 'package:geolocator/geolocator.dart';
import 'package:provider/provider.dart';
import '../providers/auth_provider.dart';
import '../providers/map_provider.dart';
import '../providers/share_provider.dart';
import '../services/geo_service.dart';

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

  @override
  State<MapScreen> createState() => _MapScreenState();
}

class _MapScreenState extends State<MapScreen> {
  LatLng _center = const LatLng(40.7128, -74.0060);
  bool _loading = true;
  Timer? _trackingTimer;
  Timer? _geoTimer;

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

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

  Future<void> _initLocationAndShare() async {
    try {
      if (!await Geolocator.isLocationServiceEnabled()) {
        setState(() => _loading = false);
        return;
      }

      final position = await Geolocator.getCurrentPosition();
      setState(() {
        _center = LatLng(position.latitude, position.longitude);
      });

      if (!mounted) return;

      final authProvider = context.read<AuthProvider>();
      final shareProvider = context.read<ShareProvider>();

      if (authProvider.token.isNotEmpty) {
        await shareProvider.createShare(
          authProvider.token,
          position.longitude,
          position.latitude,
        );
      }

      if (!mounted) return;
      setState(() => _loading = false);

      _geoTimer = Timer.periodic(
        const Duration(seconds: 30),
        (_) => _updateGeolocation(),
      );
    } catch (_) {
      setState(() => _loading = false);
    }
  }

  Future<void> _updateGeolocation() async {
    try {
      final position = await Geolocator.getCurrentPosition();
      setState(() {
        _center = LatLng(position.latitude, position.longitude);
      });

      if (!mounted) return;

      final authProvider = context.read<AuthProvider>();
      final shareProvider = context.read<ShareProvider>();

        await GeoService().updatePosition(
          authProvider.token,
          shareProvider.geoId,
          position.longitude,
          position.latitude,
        );
    } catch (_) {}
  }

  void _copyShareLink() {
    final shareProvider = context.read<ShareProvider>();
    if (shareProvider.shareId.isNotEmpty) {
      Clipboard.setData(ClipboardData(text: 'watch/${shareProvider.shareId}'));
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Ссылка скопирована')),
      );
    }
  }

  void _startTracking() {
    final authProvider = context.read<AuthProvider>();
    final shareProvider = context.read<ShareProvider>();
    
    if (shareProvider.trackingShareId.isEmpty) {
      showDialog(
        context: context,
        builder: (context) {
          final TextEditingController _controller = TextEditingController();
          return AlertDialog(
            title: const Text('Отслеживание'),
            content: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                const Text('Введите Share ID для отслеживания:'),
                const SizedBox(height: 16),
                TextField(
                  controller: _controller,
                  decoration: const InputDecoration(
                    hintText: 'Введите Share ID',
                    border: OutlineInputBorder(),
                  ),
                ),
              ],
            ),
            actions: [
              TextButton(
                onPressed: () => Navigator.pop(context),
                child: const Text('Отмена'),
              ),
              TextButton(
                onPressed: () async {
                  final shareId = _controller.text.trim();
                  if (shareId.isNotEmpty) {
                    Navigator.pop(context);
                    final token = authProvider.token;
                    await shareProvider.startTracking(shareId, token);
                    _trackingTimer = Timer.periodic(
                      const Duration(seconds: 5),
                      (_) => shareProvider.updateTrackedPosition(),
                    );
                  }
                },
                child: const Text('Начать'),
              ),
            ],
          );
        },
      );
    } else {
      shareProvider.stopTracking();
      _trackingTimer?.cancel();
    }
  }

  @override
  Widget build(BuildContext context) {
    final authProvider = context.watch<AuthProvider>();
    final _ = context.watch<MapProvider>();
    final shareProvider = context.watch<ShareProvider>();

    if (_loading) {
      return Scaffold(
        body: const Center(child: CircularProgressIndicator()),
      );
    }

    Marker? trackedMarker;
    if (shareProvider.trackedPosition != null) {
      final pos = shareProvider.trackedPosition!;
      final lat = pos['y'] as double;
      final lng = pos['x'] as double;
      trackedMarker = Marker(
        point: LatLng(lat, lng),
        width: 40,
        height: 40,
        child: const Icon(
          Icons.person,
          color: Colors.red,
          size: 30,
        ),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: Text(
          'Family Safety Map\n${_center.latitude.toStringAsFixed(4)}, ${_center.longitude.toStringAsFixed(4)}',
          textAlign: TextAlign.center,
        ),
        actions: [
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _updateGeolocation,
          ),
          IconButton(
            icon: const Icon(Icons.share),
            onPressed: _copyShareLink,
          ),
          IconButton(
            icon: Icon(
              shareProvider.trackingShareId.isEmpty
                  ? Icons.person_search
                  : Icons.person,
              color: shareProvider.trackingShareId.isEmpty
                  ? null
                  : Colors.red,
            ),
            onPressed: _startTracking,
          ),
          IconButton(
            icon: const Icon(Icons.logout),
            onPressed: () {
              _geoTimer?.cancel();
              authProvider.logout();
              Navigator.of(context).pushReplacementNamed('/');
            },
          ),
        ],
      ),
      body: FlutterMap(
        options: MapOptions(
          center: _center,
          zoom: 12.0,
        ),
        children: [
          TileLayer(
            urlTemplate: 'https://tile.openstreetmap.org/{z}/{x}/{y}.png',
          ),
          MarkerLayer(
            markers: [
              Marker(
                point: _center,
                width: 40,
                height: 40,
                child: const Icon(
                    Icons.my_location,
                    color: Colors.blue,
                    size: 30,)

              ),
              if (trackedMarker != null) trackedMarker,
            ],
          ),
        ],
      ),
    );
  }
}