import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';
import 'package:relationship_saver/app/presentation/app_shell.dart';
import 'package:relationship_saver/core/config/app_theme.dart';
import 'package:relationship_saver/core/llm/llm_config.dart';
import 'package:relationship_saver/features/ai_digest/application/llm_digest_background_scheduler.dart';
import 'package:relationship_saver/features/ai_digest/presentation/ai_digest_notification_listener.dart';
import 'package:relationship_saver/features/auth/application/session_controller.dart';
import 'package:relationship_saver/features/auth/presentation/sign_in_view.dart';
import 'package:relationship_saver/features/reminders/application/reminder_notification_listener.dart';
import 'package:relationship_saver/features/share_intake/presentation/incoming_share_listener.dart';
import 'package:relationship_saver/features/sync/application/sync_background_runner.dart';
import 'package:relationship_saver/integrations/backend/models/backend_models.dart';

/// Root app widget that wires auth, shell entry, and global listeners.
class RelationshipSaverApp extends ConsumerStatefulWidget {
  const RelationshipSaverApp({super.key});

  @override
  ConsumerState<RelationshipSaverApp> createState() =>
      _RelationshipSaverAppState();
}

class _RelationshipSaverAppState extends ConsumerState<RelationshipSaverApp> {
  @override
  void initState() {
    super.initState();
    unawaited(ref.read(llmConfigProvider.notifier).initialize());
  }

  @override
  Widget build(BuildContext context) {
    final WidgetRef ref = this.ref;
    final AsyncValue<AuthSession?> sessionState = ref.watch(
      sessionControllerProvider,
    );

    return MaterialApp(
      title: 'Relationship Saver',
      debugShowCheckedModeBanner: false,
      theme: AppTheme.light(),
      home: Scaffold(
        body: sessionState.when(
          data: (AuthSession? session) => session == null
              ? const SignInView()
              : const IncomingShareListener(
                  child: ReminderNotificationListener(
                    child: AiDigestNotificationListener(
                      child: LlmDigestBackgroundRunner(
                        child: SyncBackgroundRunner(child: AppShell()),
                      ),
                    ),
                  ),
                ),
          loading: () => const Center(child: CircularProgressIndicator()),
          error: (Object error, StackTrace stackTrace) => const SignInView(),
        ),
      ),
    );
  }
}