nkbmusic/lib/main.dart

import 'package:audio_service/audio_service.dart';
import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:go_router/go_router.dart';
import 'package:shared_preferences/shared_preferences.dart';
import 'package:supabase_flutter/supabase_flutter.dart';

import 'app/router.dart';
import 'app/theme.dart';
import 'audio/nk_audio_handler.dart';
import 'audio/player_providers.dart';
import 'audio/sound_settings.dart';
import 'core/env.dart';
import 'data/user_library.dart';
import 'offline/download_store.dart';

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

  if (Env.hasSupabase) {
    await Supabase.initialize(url: Env.supabaseUrl, publishableKey: Env.supabasePublishableKey);
  }

  final prefs = await SharedPreferences.getInstance();
  final audioHandler = await AudioService.init(
    builder: NkAudioHandler.new,
    config: const AudioServiceConfig(
      androidNotificationChannelId: 'com.metatroncubesolutions.nanga_kathai.playback',
      androidNotificationChannelName: 'Nanga Kathai playback',
      androidNotificationOngoing: true,
      androidStopForegroundOnPause: true,
    ),
  );

  final downloads = await DownloadStore.open();
  audioHandler.localSource = (item) => downloads.sourceFor(item.id, tag: item);

  runApp(
    ProviderScope(
      overrides: [
        sharedPrefsProvider.overrideWithValue(prefs),
        audioHandlerProvider.overrideWithValue(audioHandler),
        downloadStoreProvider.overrideWithValue(downloads),
      ],
      child: const NangaKathaiApp(),
    ),
  );
}

class NangaKathaiApp extends ConsumerWidget {
  const NangaKathaiApp({super.key});

  @override
  Widget build(BuildContext context, WidgetRef ref) {
    ref.watch(soundSettingsProvider); // apply the saved equalizer and boost at startup
    final router = ref.watch(routerProvider);
    // Guests hear a short preview of each song, then are invited to sign up.
    ref.listen(positionProvider, (_, next) {
      final position = next.value ?? Duration.zero;
      if (!Env.hasSupabase || isSignedIn || position < guestPreview) return;
      final handler = ref.read(audioHandlerProvider);
      if (!handler.playbackState.value.playing) return;
      handler
        ..pause()
        ..seek(Duration.zero);
      final context = router.routerDelegate.navigatorKey.currentContext;
      if (context != null) _showPreviewEnded(context);
    });
    return MaterialApp.router(
      title: 'Nanga Kathai',
      debugShowCheckedModeBanner: false,
      theme: buildNkTheme(),
      routerConfig: router,
    );
  }
}

const guestPreview = Duration(seconds: 30);

void _showPreviewEnded(BuildContext context) {
  showModalBottomSheet<void>(
    context: context,
    backgroundColor: NkColors.surface,
    showDragHandle: true,
    builder: (sheet) => SafeArea(
      child: Padding(
        padding: const EdgeInsets.fromLTRB(24, 0, 24, 24),
        child: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            Text('Enjoying the song?', style: Theme.of(sheet).textTheme.headlineSmall),
            const SizedBox(height: 8),
            const Text(
              'Previews are 30 seconds. Create a free account to listen to every song in full.',
              style: TextStyle(color: NkColors.muted, height: 1.5),
            ),
            const SizedBox(height: 20),
            FilledButton(
              onPressed: () {
                Navigator.pop(sheet);
                GoRouter.of(context).push('/login?mode=signup');
              },
              child: const Text('Create free account'),
            ),
            TextButton(
              onPressed: () {
                Navigator.pop(sheet);
                GoRouter.of(context).push('/login');
              },
              child: const Text('I already have an account'),
            ),
          ],
        ),
      ),
    ),
  );
}