trcr/lib/main_screen.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:traccar_client/main.dart';
import 'package:traccar_client/preferences.dart';
import 'package:flutter_background_geolocation/flutter_background_geolocation.dart' as bg;

import 'l10n/app_localizations.dart';

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

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

class _MainScreenState extends State<MainScreen> {
  bool trackingEnabled = false;
  bool? isMoving;

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

  void _initState() async {
    final state = await bg.BackgroundGeolocation.state;
    setState(() {
      trackingEnabled = state.enabled;
      isMoving = state.isMoving;
    });
    bg.BackgroundGeolocation.onEnabledChange((bool enabled) {
      setState(() {
        trackingEnabled = enabled;
      });
    });
    bg.BackgroundGeolocation.onMotionChange((bg.Location location) {
      setState(() {
        isMoving = location.isMoving;
      });
    });
  }

  Future<void> _checkBatteryOptimizations(BuildContext context) async {
    try {
      if (!await bg.DeviceSettings.isIgnoringBatteryOptimizations) {
        final request = await bg.DeviceSettings.showIgnoreBatteryOptimizations();
        if (!request.seen && context.mounted) {
          showDialog(
            context: context,
            builder: (_) => AlertDialog(
              scrollable: true,
              content: Text(AppLocalizations.of(context)!.optimizationMessage),
              actions: [
                TextButton(
                  onPressed: () {
                    Navigator.of(context).pop();
                    bg.DeviceSettings.show(request);
                  },
                  child: Text(AppLocalizations.of(context)!.okButton),
                ),
              ],
            ),
          );
        }
      }
    } catch (error) {
      debugPrint(error.toString());
    }
  }

  @override
  Widget build(BuildContext context) {
    final deviceId = Preferences.instance.getString(Preferences.id) ?? '';
    return Scaffold(
      appBar: AppBar(
        title: const Text('Traccar Client'),
      ),
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Card(
                child: Padding(
                  padding: const EdgeInsets.all(24),
                  child: Column(
                    children: [
                      Text(
                        'Device ID',
                        style: Theme.of(context).textTheme.labelLarge,
                      ),
                      const SizedBox(height: 8),
                      SelectableText(
                        deviceId,
                        style: Theme.of(context).textTheme.headlineSmall?.copyWith(
                          fontFamily: 'monospace',
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ],
                  ),
                ),
              ),
              const SizedBox(height: 16),
              Card(
                child: SwitchListTile(
                  title: const Text('Continuous Tracking'),
                  subtitle: Text(
                    trackingEnabled
                        ? 'Sending location updates'
                        : 'Location tracking disabled',
                  ),
                  value: trackingEnabled,
                  activeTrackColor: isMoving == false
                      ? Theme.of(context).colorScheme.error
                      : null,
                  onChanged: (bool value) async {
                    if (value) {
                      try {
                        await bg.BackgroundGeolocation.start();
                        if (mounted) {
                          _checkBatteryOptimizations(context);
                        }
                      } on PlatformException catch (error) {
                        if (!mounted) return;
                        messengerKey.currentState?.showSnackBar(
                          SnackBar(
                            content: Text(error.message ?? error.code),
                          ),
                        );
                      }
                    } else {
                      bg.BackgroundGeolocation.stop();
                    }
                  },
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}