import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import 'cache/metadata_prefetcher.dart';
import 'cache/prefetcher.dart';
import 'cache/sync_controller.dart';
import 'shared/live_events_dispatcher.dart';
import 'shared/routing.dart';
import 'theme/theme_data.dart';
import 'theme/theme_mode_provider.dart';

class MinstrelApp extends ConsumerStatefulWidget {
  const MinstrelApp({super.key});

  @override
  ConsumerState<MinstrelApp> createState() => _MinstrelAppState();
}

class _MinstrelAppState extends ConsumerState<MinstrelApp> {
  @override
  void initState() {
    super.initState();
    // Activate offline-mode infrastructure once the first frame ships.
    // SyncController.sync() is connectivity-aware (no-ops on no auth /
    // no server URL), so calling it unconditionally is safe.
    // Reading prefetcherProvider runs its constructor, which wires the
    // queue + settings listeners.
    WidgetsBinding.instance.addPostFrameCallback((_) {
      // ignore: unawaited_futures
      ref.read(syncControllerProvider.notifier).sync();
      ref.read(prefetcherProvider);
      // Metadata prefetcher: when /api/home returns, fire background
      // albumProvider/artistProvider reads for the top-N items in
      // each section so subsequent taps are drift hits, not network
      // round trips.
      ref.read(metadataPrefetcherProvider);
      // Live events (#392): subscribes to /api/events/stream and
      // invalidates publicly-scoped providers when relevant events
      // arrive. Also installs an AppLifecycleState observer for
      // resume-time defensive invalidation.
      ref.read(liveEventsDispatcherProvider);
    });
  }

  @override
  Widget build(BuildContext context) {
    final router = ref.watch(routerProvider);
    final mode = ref.watch(themeModeProvider).value ?? AppThemeMode.system;
    return MaterialApp.router(
      title: 'Minstrel',
      theme: buildLightTheme(),
      darkTheme: buildDarkTheme(),
      themeMode: mode.materialMode,
      routerConfig: router,
    );
  }
}