import 'dart:async';

import 'package:flutter/material.dart';
import 'package:traccar_client/bridge/location_bridge.dart';
import 'package:traccar_client/preferences.dart';
import 'package:traccar_client/settings_screen.dart';
import 'package:traccar_client/status_screen.dart';

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

  @override
  State<MainScreen> createState() => _MainScreenState();
}

class _MainScreenState extends State<MainScreen> {
  StreamSubscription<Map<String, dynamic>>? _locationSubscription;
  bool _isTracking = false;
  String _lastLat = '--';
  String _lastLon = '--';
  String _lastSpeed = '--';
  String _lastTime = '--';

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

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

  Future<void> _initLocationStream() async {
    final status = await LocationBridge.getStatus();
    if (mounted) {
      setState(() {
        _isTracking = status?['isTracking'] == true;
        final lat = status?['lastLatitude'];
        final lon = status?['lastLongitude'];
        if (lat != null && lat != 0.0) {
          _lastLat = lat.toStringAsFixed(4);
        }
        if (lon != null && lon != 0.0) {
          _lastLon = lon.toStringAsFixed(4);
        }
        final speed = status?['lastSpeed'];
        if (speed != null) {
          _lastSpeed = '${(speed * 3.6).toStringAsFixed(0)} km/h';
        }
        final timestamp = status?['lastTimestamp'];
        if (timestamp != null) {
          _lastTime = _formatTime(
            DateTime.fromMillisecondsSinceEpoch(timestamp),
          );
        }
      });
    }

    _locationSubscription = LocationBridge.locationUpdates.listen((location) {
      if (mounted) {
        setState(() {
          _lastLat = location['latitude']?.toStringAsFixed(4) ?? '--';
          _lastLon = location['longitude']?.toStringAsFixed(4) ?? '--';
          _lastSpeed = location['speed'] != null
              ? '${(location['speed'] * 3.6).toStringAsFixed(0)} km/h'
              : '--';
          _lastTime = location['timestamp'] != null
              ? _formatTime(
                  DateTime.fromMillisecondsSinceEpoch(location['timestamp']),
                )
              : '--';
        });
      }
    });
  }

  String _formatTime(DateTime dt) {
    return '${dt.hour.toString().padLeft(2, '0')}:${dt.minute.toString().padLeft(2, '0')}:${dt.second.toString().padLeft(2, '0')}';
  }

  Future<void> _toggleTracking() async {
    final previousState = _isTracking;
    final newState = !_isTracking;

    setState(() {
      _isTracking = newState;
    });

    bool success;
    if (newState) {
      success = await LocationBridge.startTracking(config: {
        'serverUrl': Preferences.serverUrl,
        'deviceId': Preferences.deviceId,
        'password': Preferences.password,
        'accuracy': Preferences.accuracy,
        'distanceFilter': Preferences.distanceFilter,
        'interval': Preferences.interval,
        'heartbeat': Preferences.heartbeat,
        'offlineBuffer': Preferences.offlineBuffer,
        'stopDetection': Preferences.stopDetection,
      });
    } else {
      success = await LocationBridge.stopTracking();
    }

    if (!success && mounted) {
      setState(() {
        _isTracking = previousState;
      });
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text(previousState ? 'Failed to stop tracking' : 'Failed to start tracking'),
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Traccar Client'), centerTitle: true),
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            _buildStatusCard(),
            const SizedBox(height: 24),
            _buildTrackingToggle(),
            const Spacer(),
            _buildActionButtons(),
          ],
        ),
      ),
    );
  }

  Widget _buildStatusCard() {
    return Card(
      child: Padding(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            Text(
              'Last Location',
              style: Theme.of(context).textTheme.titleMedium,
            ),
            const SizedBox(height: 16),
            _buildInfoRow('Lat', _lastLat),
            _buildInfoRow('Lon', _lastLon),
            _buildInfoRow('Speed', _lastSpeed),
            _buildInfoRow('Time', _lastTime),
          ],
        ),
      ),
    );
  }

  Widget _buildInfoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4.0),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text(label),
          Text(value, style: const TextStyle(fontWeight: FontWeight.bold)),
        ],
      ),
    );
  }

  Widget _buildTrackingToggle() {
    return SwitchListTile(
      title: Text(_isTracking ? 'Tracking: ON' : 'Tracking: OFF'),
      subtitle: Text(
        _isTracking ? 'Location updates active' : 'Tap to start tracking',
      ),
      value: _isTracking,
      onChanged: (_) => _toggleTracking(),
      activeTrackColor: Colors.green,
    );
  }

  Widget _buildActionButtons() {
    return Column(
      children: [
        if (_isTracking)
          Padding(
            padding: const EdgeInsets.only(bottom: 16),
            child: SizedBox(
              width: double.infinity,
              child: ElevatedButton.icon(
                onPressed: () async {
                  final success = await LocationBridge.reportLocation();
                  if (mounted) {
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                        content: Text(
                          success
                              ? 'Location sent to server'
                              : 'Failed - check logs',
                        ),
                        duration: Duration(seconds: 2),
                      ),
                    );
                  }
                },
                icon: const Icon(Icons.send),
                label: const Text('Send Location'),
              ),
            ),
          ),
        Row(
          children: [
            Expanded(
              child: ElevatedButton.icon(
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(builder: (_) => const SettingsScreen()),
                  );
                },
                icon: const Icon(Icons.settings),
                label: const Text('Settings'),
              ),
            ),
            const SizedBox(width: 16),
            Expanded(
              child: ElevatedButton.icon(
                onPressed: () {
                  Navigator.push(
                    context,
                    MaterialPageRoute(builder: (_) => const StatusScreen()),
                  );
                },
                icon: const Icon(Icons.history),
                label: const Text('Status/Logs'),
              ),
            ),
          ],
        ),
      ],
    );
  }
}