import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:shared_preferences/shared_preferences.dart';

import 'data/autopilot_state.dart';
import 'theme/theme_provider.dart';
import 'screens/cockpit/cockpit_screen.dart';
import 'screens/settings/appearance_settings.dart';
import 'screens/settings/port_settings_screen.dart';

// SharedPreferences keys — must match port_settings_screen.dart
const _kRxKey = 'port.rx';
const _kTxKey = 'port.tx';

Future<void> main() async {
  WidgetsFlutterBinding.ensureInitialized();

  // Load persisted theme before first frame.
  final themeProvider = await AutopilotThemeProvider.load();

  // Create state object early so we can attempt auto-connect.
  final autopilotState = AutopilotState();

  // Attempt to reconnect to the last-used COM ports silently.
  // If the ports are not available (hardware unplugged, different PC, etc.)
  // the exception is swallowed and the UI stays in demo mode.
  try {
    final prefs = await SharedPreferences.getInstance();
    final rxPort = prefs.getString(_kRxKey);
    final txPort = prefs.getString(_kTxKey);
    if (rxPort != null && txPort != null) {
      await autopilotState.connectToSerial(rxPort: rxPort, txPort: txPort);
    }
  } catch (_) {
    // Hardware not available — stay in demo mode.
  }

  runApp(
    MultiProvider(
      providers: [
        ChangeNotifierProvider<AutopilotThemeProvider>.value(
          value: themeProvider,
        ),
        ChangeNotifierProvider<AutopilotState>.value(
          value: autopilotState,
        ),
      ],
      child: const ArAutopilotApp(),
    ),
  );
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'AR-Autopilot',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(useMaterial3: true),
      initialRoute: CockpitScreen.routeName,
      routes: {
        CockpitScreen.routeName:         (_) => const CockpitScreen(),
        AppearanceSettingsScreen.routeName: (_) => const AppearanceSettingsScreen(),
        PortSettingsScreen.routeName:    (_) => const PortSettingsScreen(),
      },
    );
  }
}