import 'dart:developer';
import 'dart:io';

import 'package:mnemo_cards_backend/api/mnemo_shelf.dart';
import 'package:mnemo_cards_backend/cron/add_free_packs.dart';
import 'package:mnemo_cards_backend/cron/backup.dart';
import 'package:mnemo_cards_backend/cron/cron_executor.dart';
import 'package:mnemo_cards_backend/cron/generate_promocodes.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_backend/discounts/discounts_manager.dart';
import 'package:mnemo_cards_backend/user/user_manager.dart';
import 'package:mnemo_cards_backend/tests/test_manager.dart';

import 'api/di/injector.dart';
import 'cron/check_admins.dart';
import 'cron/check_payment.dart';
import 'cron/delete_old_archives.dart';
import 'cron/discount_campaign_task.dart';
import 'cron/tasks_seeder.dart';
import 'cron/test_generator.dart';
import 'cron/update_online_users.dart';
import 'packs/free_packs_distributor.dart';

late AppDatabase database;

late final String WORK_DIR;

/// Инициализация подключения к PostgreSQL
Future<AppDatabase> _initDatabase() async {
  var attempt = 0;
  const maxAttempts = 5;
  
  while (attempt < maxAttempts) {
    print('Attempt ${attempt + 1}/$maxAttempts to connect to PostgreSQL...');
    
    try {
      // Создать подключение из environment variables
      final db = AppDatabase.fromEnvironment();
      
      // Проверить подключение
      await db.customSelect('SELECT 1').getSingle();
      
      print('✅ Successfully connected to PostgreSQL');
      return database = db;
      
    } catch (e, s) {
      print('❌ Error connecting to PostgreSQL: $e');
      log('Error connecting to PostgreSQL: $e', error: e, stackTrace: s);
      
      attempt++;
      if (attempt < maxAttempts) {
        final delay = Duration(seconds: attempt * 5);
        print('Retrying in ${delay.inSeconds} seconds...');
        await Future.delayed(delay);
      }
    }
  }
  
  throw Exception('Failed to connect to PostgreSQL after $maxAttempts attempts');
}

void main() async {
  print('🚀 Starting Mnemo Cards Backend...');
  
  // Читаем environment variables
  final backupDir = Platform.environment['BACKUP_DIR'] ?? '../backups/';
  WORK_DIR = Platform.environment['WORK_DIR'] ?? '/root/mnemo_cards_backend';
  final debugMode = Platform.environment['DEBUG'] == 'true' ||
      Platform.environment['DEBUG'] == '1';
  
  print('📂 Working directory: $WORK_DIR');
  print('🐛 Debug mode: $debugMode');
  
  print(
    'running server in ${(await Process.run('pwd', [], runInShell: true)).stdout}',
  );

  // For rustore payments
  // final rustoreEnabled = false;
  // if (rustoreEnabled) {
  //   final pythonInit = await Process.run(
  //     workingDirectory: WORK_DIR,
  //     './prepare_python.sh',
  //     [],
  //     runInShell: true,
  //   );
  //   print(pythonInit.stdout);
  //   print(pythonInit.stderr);
  // } else {
  //   log('\n\n*******\nRUSTORE IS DISABLED\n******\n\n', level: 1000);
  // }
  
  // Инициализация PostgreSQL
  try {
    await _initDatabase();
    
    // Настройка зависимостей (AppDatabase уже регистрируется через @singleton в modules.dart)
    configureDependencies();
    
    // Запуск API сервера
    print('🌐 Starting API server...');
    await getIt<MnemoShelf>().initV2();
    
    // Запуск cron jobs
    print('⏰ Starting cron jobs...');
    // ignore: unawaited_futures
    CronManager([
      DeleteOldArchives(),
      CheckAdminsTask(database),
      getIt.get<CheckPaymentTask>(),
      AddFreePacks(getIt.get<FreePacksDistributor>(), database),
      Backup(backupDir),
      GeneratePromocodes(database),
      DiscountCampaignTask(getIt.get<DiscountsManager>(), database),
      UpdateOnlineUsersTask(getIt.get<UserManager>()),
      TasksSeederTask(database),
      TestGeneratorTask(getIt.get<TestManager>(), database),
    ]).init();
    
    print('✅ Backend started successfully!');
    
  } catch (e, s) {
    print('❌ Fatal error starting backend: $e');
    log('Fatal error starting backend: $e', error: e, stackTrace: s);
    exit(1);
  }
  
  // Обработка SIGTERM для graceful shutdown
  ProcessSignal.sigterm.watch().listen((signal) async {
    print('🛑 Received SIGTERM, shutting down gracefully...');
    
    try {
      // Закрыть подключение к БД
      await database.close();
      print('✅ Database connection closed');
    } catch (e, s) {
      print('❌ Error closing database: $e');
      log('Error closing database: $e', error: e, stackTrace: s);
    }
    
    exit(0);
  });
}