import 'dart:convert';
import 'dart:developer';
import 'dart:io';
import 'package:dio/dio.dart';
import 'package:googleapis/androidpublisher/v3.dart' as ap;
import 'package:googleapis/firestore/v1.dart' as fs;

import 'package:googleapis_auth/auth_io.dart' as auth;
import 'package:injectable/injectable.dart';
import 'package:mnemo_cards_backend/api/purchase/google_play_purchase_handler.dart';
import 'package:mnemo_cards_backend/api/purchase/rustore/rustore_purchase_response.dart';
import 'package:mnemo_cards_backend/database/database.dart';
import 'package:mnemo_cards_backend/user/user_drift_extension.dart';
import 'package:mnemo_cards_common_backend/mnemo_cards_common_backend.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';
import 'package:yookassa_client/yookassa_client.dart';
import 'package:drift/drift.dart' as drift;

import 'payment_drift_extension.dart';
import '../../main.dart' as backend_main;

import '../../packs/pack_manager.dart';
import '../../packs/products_price_resolver.dart';
import '../subscription/subscription_manager.dart';
import 'iap_repository.dart';
import 'rustore/rustore_purchase_handler.dart';
import 'yoo_money.dart';

@lazySingleton
class PaymentManager {
  final AppDatabase _db;
  final PackManager _packManager;
  final SubscriptionManager _subscriptionManager;
  late final GooglePlayPurchaseHandler googlePurchaseHandler;
  final YooMoneyHandler _yooMoneyHandler;
  final RustorePurchaseHandler _rustorePurchaseHandler;
  final ProductsPriceResolver _productsPriceResolver;

  PaymentManager(
    this._db,
    this._packManager,
    this._subscriptionManager,
    this._yooMoneyHandler,
    this._rustorePurchaseHandler,
    this._productsPriceResolver,
  );

  /// Создать платеж в базе данных
  Future<PaymentDto> createPayment(PaymentDto paymentDto, int userId) async {
    final companion = paymentDto.toCompanion(userId);
    final paymentId = await _db.paymentDao.createPayment(companion);
    final payment = await _db.paymentDao.getPaymentById(paymentId);
    if (payment == null) {
      throw Exception('Failed to create payment');
    }
    return payment.toDto();
  }

  /// Обновить платеж в базе данных
  Future<void> updatePayment(int paymentId, PaymentDto paymentDto) async {
    final companion = paymentDto.toUpdateCompanion(paymentId);
    await _db.paymentDao.updatePaymentCompanion(companion);
  }

  /// Получить платеж по ID
  Future<PaymentDto?> getPaymentById(int id) async {
    final payment = await _db.paymentDao.getPaymentById(id);
    return payment?.toDto();
  }

  /// Создать обработчики платежей Google Play
  Future<Map<String, GooglePlayPurchaseHandler>>
      _createPurchaseHandlers() async {
    return {};
  }

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

            await _db.subscriptionDao.createUserSubscription(
              UserSubscriptionsCompanion.insert(
                userId: userId,
                start: now,
                finish: endDate,
                features: drift.Value(plan.features as List<dynamic>),
              ),
            );
            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 user = await _db.userDao.getUserWithDataById(payment.userId);
    if (user == null) {
      log('User not found: ${payment.userId}');
      return;
    }

      // Извлечь IDs пакетов из продуктов
    final packIds = <int>[];
    if (payment.products != null) {
      for (final product in payment.products!) {
        final productMap = product as Map<String, dynamic>;
        if (productMap['type'] == 'pack' && productMap['id'] != null) {
          packIds.add(int.parse(productMap['id'].toString()));
        }
      }
    }

    // Извлечь IDs подписок из продуктов
    final subscriptionIds = <int>[];
    if (payment.products != null) {
      for (final product in payment.products!) {
        final productMap = product as Map<String, dynamic>;
        if (productMap['type'] == 'subscription' && productMap['id'] != null) {
          subscriptionIds.add(int.parse(productMap['id'].toString()));
        }
      }
    }

    await _db.transaction(() async {
      // Дать доступ к пакетам
      for (final packId in packIds) {
        await _db.userDao.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 _db.subscriptionDao.getPlanById(subscriptionId);
        if (plan != null) {
          final now = DateTime.now();
          final endDate = now.add(Duration(days: plan.durationDays));

          await _db.subscriptionDao.createUserSubscription(
            UserSubscriptionsCompanion.insert(
              userId: payment.userId,
              start: now,
              finish: endDate,
              features: drift.Value(plan.features as List<dynamic>),
            ),
          );
          log('Created subscription for user ${payment.userId}, plan: $subscriptionId');
        }
      }

      // Обновить статус платежа
      await _db.paymentDao.updatePaymentStatus(payment.id, PaymentStatus.processed.name);
      log('Payment ${payment.id} processed successfully');
    });
  }

  /// 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) {
        await _db.paymentDao.updatePaymentStatus(payment.id, PaymentStatus.waiting.name);
        return false;
      }

      // Обновить статус платежа
      await _db.paymentDao.updatePaymentStatus(payment.id, 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 payments = await _db.paymentDao.getPaymentsByProduct(productId);
      final payment = payments.isNotEmpty ? payments.first : null;

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

      if (rustorePurchaseResponse?.invoiceStatus.name == 'paid') {
        await _db.paymentDao.updatePaymentStatus(payment.id, PaymentStatus.succeeded.name);
        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 payment = await _db.paymentDao.getPaymentByExternalToken(token);
      if (payment == null) {
        log('Payment not found for token: $token');
        return false;
      }

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

      if (yookassaPayment.status == 'succeeded') {
        await _db.paymentDao.updatePaymentStatus(payment.id, PaymentStatus.succeeded.name);
        await processPayment(payment);
        return true;
      } else if (yookassaPayment.status == 'canceled') {
        await _db.paymentDao.updatePaymentStatus(payment.id, PaymentStatus.canceled.name);
      }

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

  /// Создать URL для оплаты через YooKassa
  Future<String> createYookassaUrl({
    required String amount,
    required String description,
    required String userId,
  }) async {
    final yookassaPayment = await _yooMoneyHandler.createPayment(
      amount: amount,
      description: description,
      userId: userId,
    );

    if (yookassaPayment.confirmationUrl == null) {
      throw Exception('Failed to create YooKassa payment URL');
    }

    // Создать запись платежа в БД
    final paymentDto = PaymentDto(
      amount: amount,
      currency: 'RUB',
      date: DateTime.now(),
      status: PaymentStatus.created,
      paymentSystem: PaymentSystem.yookassa,
      packs: [],
      subscription: false,
      products: [],
      externalToken: yookassaPayment.id,
      meta: null,
    );

    await createPayment(paymentDto, int.parse(userId));

    return yookassaPayment.confirmationUrl!;
  }

  /// Получить платежи пользователя
  Future<List<PaymentDto>> getUserPayments(String userIdString) async {
    final userId = int.tryParse(userIdString);
    if (userId == null) return [];

    final payments = await _db.paymentDao.getPaymentsByUserId(userId);
    return payments.map((p) => p.toDto()).toList();
  }

  /// 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 != null && payment.products!.isNotEmpty) {
          final firstProduct = payment.products!.first as Map<String, dynamic>;
          final productId = firstProduct['id']?.toString();
          if (productId != null) {
            final user = await _db.userDao.getUserById(payment.userId);
            await checkRustorePayment(
              productId: productId,
              subscriptionToken: payment.externalToken!,
              user: user != null ? await user.toUserModel() : null,
            );
          }
        }
      }
    } catch (e, s) {
      log('Error checking payment ${payment.id}: $e');
      print(s);
    }
  }
}