// lib/main.dart

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'services/media_service.dart';
import 'screens/player_screen.dart';
import 'screens/permission_screen.dart';

void main() {
  WidgetsFlutterBinding.ensureInitialized();
  // Force portrait
  SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]);
  runApp(const OpenVinylApp());
}

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'OpenVinyl',
      debugShowCheckedModeBanner: false,
      theme: ThemeData.dark(useMaterial3: true),
      home: AppEntry(mediaService: MediaService()),
    );
  }
}

/// Checks notification permission on startup, shows the right screen.
class AppEntry extends StatefulWidget {
  final MediaService mediaService;
  const AppEntry({super.key, required this.mediaService});

  @override
  State<AppEntry> createState() => _AppEntryState();
}

class _AppEntryState extends State<AppEntry> with WidgetsBindingObserver {
  bool? _hasPermission; // null = loading

  @override
  void initState() {
    super.initState();
    WidgetsBinding.instance.addObserver(this);
    _checkPermission();
  }

  @override
  void dispose() {
    WidgetsBinding.instance.removeObserver(this);
    super.dispose();
  }

  // Re-check permission when the user returns from system settings
  @override
  void didChangeAppLifecycleState(AppLifecycleState state) {
    if (state == AppLifecycleState.resumed && _hasPermission == false) {
      _checkPermission();
    }
  }

  Future<void> _checkPermission() async {
    final granted = await widget.mediaService.hasPermission();
    setState(() => _hasPermission = granted);
  }

  @override
  Widget build(BuildContext context) {
    if (_hasPermission == null) {
      // Still loading
      return const Scaffold(
        backgroundColor: Color(0xFF0D0D0D),
        body: Center(
          child: CircularProgressIndicator(color: Colors.white30),
        ),
      );
    }

    if (!_hasPermission!) {
      return PermissionScreen(
        mediaService: widget.mediaService,
        onPermissionGranted: () => setState(() => _hasPermission = true),
      );
    }

    return PlayerScreen(mediaService: widget.mediaService);
  }
}