import 'dart:developer';
import 'package:drift_postgres/drift_postgres.dart';
import 'package:injectable/injectable.dart';
import 'package:mnemo_cards_backend/api/purchase/google_play_purchase_handler.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';
import 'package:drift/drift.dart' as drift;

import 'rustore/rustore_purchase_handler.dart';
import 'yoo_money.dart';
import '../../packs/product_availability_manager.dart';
import '../../repository/export.dart';

/// Result of creating YooKassa payment URL
class YookassaPaymentResult {
  final String confirmationUrl;
  final String paymentId;

  YookassaPaymentResult({
    required this.confirmationUrl,
    required this.paymentId,
  });
}

@lazySingleton
class PaymentManager {
  final PaymentRepository _paymentRepository;
  final SubscriptionRepository _subscriptionRepository;
  final UserRepository _userRepository;
  final ProductAvailabilityManager _productAvailabilityManager;
  late final GooglePlayPurchaseHandler googlePurchaseHandler;
  final YooMoneyHandler _yooMoneyHandler;
  final RustorePurchaseHandler _rustorePurchaseHandler;
  final AppDatabase _db;

  PaymentManager(
    this._paymentRepository,
    this._subscriptionRepository,
    this._userRepository,
    this._productAvailabilityManager,
    this._yooMoneyHandler,
    this._rustorePurchaseHandler,
    this._db,
  );

  /// Создать платеж в базе данных
  Future<PaymentDto> createPayment(PaymentDto paymentDto, String userId) async {
    print('🔍 PaymentManager.createPayment: Starting');
    print(
      '🔍 PaymentManager.createPayment: userId=$userId, externalToken=${paymentDto.externalToken}',
    );
    print(
      '🔍 PaymentManager.createPayment: Calling paymentRepository.createPayment',
    );
    final payment = await _paymentRepository.createPayment(paymentDto, userId);
    print('✅ PaymentManager.createPayment: Payment created successfully');
    return payment;
  }

  /// Обновить платеж в базе данных
  Future<void> updatePayment(String paymentId, PaymentDto paymentDto) async {
    await _paymentRepository.updatePayment(paymentId, paymentDto);
  }

  /// Получить платеж по ID
  Future<PaymentDto?> getPaymentById(String id) async {
    return await _paymentRepository.getPaymentById(id);
  }

  /// Получить последний платеж для пользователя и пака
  /// Используется при возврате с ЮКассы без paymentId
  Future<PaymentDto?> getLatestPaymentForUserAndPack({
    required String userId,
    required String packId,
  }) async {
    return await _paymentRepository.getLatestPaymentForUserAndPack(
      userId: userId,
      packId: packId,
    );
  }

  /// Выдать продукт пользователю (для промокодов и других бесплатных активаций)
  Future<void> grantProductToUser(
    String userId,
    MnemoCardsProductDto product,
  ) async {
    await _db.transaction(() async {
      if (product.type == MnemoCardsProductType.pack && product.id != null) {
        await _productAvailabilityManager.grantProductAccess(
          userId: userId,
          product: product,
          grantType: 'promo_code',
        );
        log('Granted pack ${product.id} to user $userId via promo code');
      } else if (product.type == MnemoCardsProductType.subscription &&
          product.id != null) {
        final planId = product.id!;
        final plan = await _subscriptionRepository.getPlanById(planId);
        if (plan != null) {
          final now = DateTime.now();
          final endDate = now.add(Duration(days: plan.durationDays));

          await _subscriptionRepository.createSubscription(
            UserSubscriptionsCompanion.insert(
              userId: userId,
              start: PgDateTime(now),
              finish: PgDateTime(endDate),
              features: drift.Value(plan.features.map((f) => f.name).toList()),
            ),
          );
          log('Granted subscription $planId to user $userId via promo code');
        }
      }
    });
  }

  /// Обработать платеж - дать доступ к купленным пакетам и подпискам
  Future<void> processPayment(Payment payment) async {
    if (payment.status == PaymentStatus.processed.name) {
      log('Payment already processed');
      return;
    }

    if (payment.status != PaymentStatus.succeeded.name) {
      throw Exception('Payment status is not succeeded');
    }

    // Получить пользователя
    final userModel = await _userRepository.getUserById(payment.userId);
    if (userModel == null) {
      log('User not found: ${payment.userId}');
      return;
    }

    // Извлечь IDs пакетов из продуктов
    final packIds = <String>[];
    try {
      if (payment.products.isNotEmpty && payment.products != '[]') {
        for (final product in payment.products) {
          final productMap = product as Map<String, dynamic>;
          if (productMap['type'] == 'pack' && productMap['id'] != null) {
            packIds.add(productMap['id'].toString());
          }
        }
      }
    } catch (e) {
      log('Error parsing products: $e');
    }

    // Извлечь IDs подписок из продуктов
    final subscriptionIds = <String>[];
    try {
      if (payment.products.isNotEmpty && payment.products != '[]') {
        for (final product in payment.products) {
          final productMap = product as Map<String, dynamic>;
          if (productMap['type'] == 'subscription' &&
              productMap['id'] != null) {
            subscriptionIds.add(productMap['id'].toString());
          }
        }
      }
    } catch (e) {
      log('Error parsing products: $e');
    }

    await _db.transaction(() async {
      // Дать доступ к пакетам
      for (final packId in packIds) {
        await _productAvailabilityManager.grantPackAccess(
          userId: payment.userId,
          packId: packId,
          grantType: 'purchase',
        );
        log('Granted access to pack $packId for user ${payment.userId}');
      }

      // Создать подписки
      for (final subscriptionId in subscriptionIds) {
        final plan = await _subscriptionRepository.getPlanById(subscriptionId);
        if (plan != null) {
          final now = DateTime.now();
          final endDate = now.add(Duration(days: plan.durationDays));

          await _subscriptionRepository.createSubscription(
            UserSubscriptionsCompanion.insert(
              userId: payment.userId,
              start: PgDateTime(now),
              finish: PgDateTime(endDate),
              features: drift.Value(plan.features.map((f) => f.name).toList()),
            ),
          );
          log(
            'Created subscription for user ${payment.userId}, plan: $subscriptionId',
          );
        }
      }

      // Обновить статус платежа
      // Note: Payment class should have an id field when returned from queries
      // If payment.id doesn't work, the database needs to be regenerated
      // For now, we'll try to find the payment by externalToken and update it
      if (payment.externalToken != null && payment.externalToken!.isNotEmpty) {
        try {
          // Try to update by externalToken (if it's used as identifier)
          // TODO: Once database is regenerated, use payment.id directly
          await _paymentRepository.updatePaymentStatus(
            payment.externalToken!,
            PaymentStatus.processed.name,
          );
          log('Payment processed successfully for user ${payment.userId}');
        } catch (e) {
          log('Warning: Could not update payment status: $e');
          log(
            'Payment processed for user ${payment.userId}, but status update failed. Database regeneration may be needed.',
          );
        }
      } else {
        log(
          'Payment processed for user ${payment.userId}, but cannot update status without externalToken or payment.id',
        );
      }
    });
  }

  /// Проверить платеж Google Play
  Future<bool> checkGooglePayment({
    required String productId,
    required String token,
    required UserModel? user,
  }) async {
    if (user == null) return false;

    try {
      // Найти платеж по external token
      final payment = await _db.paymentDao.getPaymentByExternalToken(token);
      if (payment == null) {
        log('Payment not found for token: $token');
        return false;
      }

      // Проверить статус в Google Play
      final acknowledged = await googlePurchaseHandler.acknowledge(
        productId,
        token,
      );
      if (!acknowledged) {
        // Use token as payment identifier since Payment.id might not be available
        await _db.paymentDao.updatePaymentStatus(
          token,
          PaymentStatus.waiting.name,
        );
        return false;
      }

      // Обновить статус платежа
      // Use token as payment identifier
      await _db.paymentDao.updatePaymentStatus(
        token,
        PaymentStatus.succeeded.name,
      );

      // Обработать платеж
      await processPayment(payment);

      return true;
    } catch (e) {
      log('Error checking Google payment: $e');
      return false;
    }
  }

  /// Проверить платеж RuStore
  Future<bool> checkRustorePayment({
    required String productId,
    required String subscriptionToken,
    required UserModel? user,
  }) async {
    if (user == null) return false;

    try {
      final rustorePurchaseResponse = await _rustorePurchaseHandler
          .checkPayment(subscriptionToken);

      // Найти платеж по продукту
      final paymentsDto = await _paymentRepository.getPaymentsByProduct(
        productId,
      );
      final paymentDto = paymentsDto.isNotEmpty ? paymentsDto.first : null;

      if (paymentDto == null) {
        log('Payment not found for product: $productId');
        return false;
      }

      if (rustorePurchaseResponse?.invoiceStatus.name == 'paid') {
        // Find payment id by productId or use subscriptionToken
        final token = paymentDto.externalToken ?? subscriptionToken;
        if (token.isNotEmpty) {
          await _paymentRepository.updatePaymentStatus(
            token,
            PaymentStatus.succeeded.name,
          );
        }
        // Обработать платеж - нужно получить Payment из БД для processPayment
        final payment = await _db.paymentDao.getPaymentByExternalToken(token);
        if (payment != null) {
          await processPayment(payment);
        }
        return true;
      }

      return false;
    } catch (e) {
      log('Error checking RuStore payment: $e');
      return false;
    }
  }

  /// Проверить платеж YooKassa
  Future<bool> checkYookassaPayment(String token) async {
    try {
      final paymentDto = await _paymentRepository.getPaymentByExternalToken(
        token,
      );
      if (paymentDto == null) {
        print('Payment not found for token: $token');
        return false;
      }

      // Проверить статус в YooKassa
      final yookassaPayment = await _yooMoneyHandler.checkPayment(token);

      if (yookassaPayment.status == 'succeeded') {
        // Use token as payment identifier
        await _paymentRepository.updatePaymentStatus(
          token,
          PaymentStatus.succeeded.name,
        );
        // Обработать платеж - нужно получить Payment из БД для processPayment
        final payment = await _db.paymentDao.getPaymentByExternalToken(token);
        if (payment != null) {
          await processPayment(payment);
        }
        return true;
      } else if (yookassaPayment.status == 'canceled') {
        await _paymentRepository.updatePaymentStatus(
          token,
          PaymentStatus.canceled.name,
        );
      }

      return false;
    } catch (e) {
      log('Error checking YooKassa payment: $e');
      return false;
    }
  }

  /// Создать URL для оплаты через YooKassa
  Future<YookassaPaymentResult> createYookassaUrl({
    required String amount,
    required String description,
    required String userId,
    List<MnemoCardsProductDto> products = const [],
    String? packId,
  }) async {
    print('🔍 PaymentManager.createYookassaUrl: Starting');
    print(
      '🔍 PaymentManager.createYookassaUrl: amount=$amount, userId=$userId, products=${products.length}',
    );

    print(
      '🔍 PaymentManager.createYookassaUrl: Calling YooMoneyHandler.createPayment',
    );
    final yookassaPayment = await _yooMoneyHandler.createPayment(
      amount: amount,
      description: description,
      userId: userId,
      packId: packId,
    );
    print(
      '✅ PaymentManager.createYookassaUrl: YooKassa payment created, id=${yookassaPayment.id}',
    );

    if (yookassaPayment.confirmationUrl == null) {
      print('❌ PaymentManager.createYookassaUrl: confirmationUrl is null');
      throw Exception('Failed to create YooKassa payment URL');
    }

    // Создать запись платежа в БД
    print('🔍 PaymentManager.createYookassaUrl: Creating payment in database');
    final paymentDto = PaymentDto(
      amount: amount,
      currency: 'RUB',
      date: DateTime.now(),
      status: PaymentStatus.created,
      paymentSystem: PaymentSystem.yookassa,
      products: products,
      externalToken: yookassaPayment.id,
      meta: null,
    );

    print('🔍 PaymentManager.createYookassaUrl: Calling createPayment');
    await createPayment(paymentDto, userId);
    print('✅ PaymentManager.createYookassaUrl: Payment created in database');

    print(
      '✅ PaymentManager.createYookassaUrl: Returning confirmationUrl and paymentId',
    );
    return YookassaPaymentResult(
      confirmationUrl: yookassaPayment.confirmationUrl!,
      paymentId: yookassaPayment.id,
    );
  }

  /// Получить платежи пользователя
  Future<List<PaymentDto>> getUserPayments(String userIdString) async {
    return await _paymentRepository.getPaymentsByUserId(userIdString);
  }

  /// Проверить и обработать платеж (для cron задач)
  Future<void> checkAndProcessPayment(Payment payment) async {
    // Если платеж уже обработан, пропускаем
    if (payment.status == PaymentStatus.processed.name) {
      return;
    }

    // Если статус unknown, пропускаем
    if (payment.status == PaymentStatus.unknown.name) {
      return;
    }

    try {
      final system = PaymentSystem.values.firstWhere(
        (s) => s.name == payment.paymentSystem,
        orElse: () => PaymentSystem.yookassa,
      );

      if (system == PaymentSystem.yookassa && payment.externalToken != null) {
        await checkYookassaPayment(payment.externalToken!);
      } else if (system == PaymentSystem.rustore &&
          payment.externalToken != null) {
        // Для RuStore нужен productId - получаем из products
        if (payment.products.isNotEmpty && payment.products != '[]') {
          try {
            if (payment.products.isNotEmpty) {
              final firstProduct = payment.products.first;
              final productId = firstProduct['id']?.toString();
              if (productId != null && payment.externalToken != null) {
                final user = await _userRepository.getUserById(payment.userId);
                await checkRustorePayment(
                  productId: productId,
                  subscriptionToken: payment.externalToken!,
                  user: user,
                );
              }
            }
          } catch (e) {
            log('Error parsing products for RuStore payment: $e');
          }
        }
      }
    } catch (e, s) {
      log('Error checking payment for user ${payment.userId}: $e');
      print(s);
    }
  }
}