mnemo_cards/lib/features/purchase/google_purchase_handler.dart

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

import 'package:in_app_purchase/in_app_purchase.dart';
import 'package:in_app_purchase_android/billing_client_wrappers.dart';
import 'package:in_app_purchase_android/in_app_purchase_android.dart';
import 'package:mnemo_cards/features/analytics/analytics.dart';
import 'package:mnemo_cards/managers/repository/repository.dart';
import 'package:mnemo_cards_common/mnemo_cards_common.dart';

import 'purchase_handler.dart';

class GooglePurchaseHandler implements PurchaseHandler {
  final InAppPurchase _inAppPurchase = InAppPurchase.instance;
  final Repository _repository;

  StreamSubscription? _subscription;

  GooglePurchaseHandler(this._repository);

  Future<void> initPurchase({
    required String id,
    required MnemoCardsProductType productType,
    required String paymentId,
    String? source,
  }) async {
    if (productType == MnemoCardsProductType.unknown) {
      log('unknown product type');
      return;
    }
    if (!await isAvailable) {
      log('Google play payment not available');
      return;
    }
    final productId = paymentId.split('/').first;
    final subscriptionId = paymentId.split('/').last;
    final products = await _getStoreProduct(productId);
    if (products.isEmpty) {
      Analytics.buyError(
        null,
        paymentSystem,
        paymentId: paymentId,
        id: id,
        message: 'No products',
      );
      return;
    }

    switch (productType) {
      case MnemoCardsProductType.pack:
        final product = products.first;
        await _buyInStore(product);
        return;
      case MnemoCardsProductType.subscription:
        // choosing the right subscription plan
        final subs = products.first.productDetails.subscriptionOfferDetails;
        final index = subs?.indexWhere((s) => s.basePlanId == subscriptionId);
        if (index == null) {
          Analytics.buyError(
            null,
            paymentSystem,
            paymentId: paymentId,
            id: id,
            message: 'Unknown subscription id',
          );
          return;
        }
        await _buyInStore(products[index]);
        return;
      case MnemoCardsProductType.discount:
        return;
      case MnemoCardsProductType.unknown:
        Analytics.buyError(
          null,
          paymentSystem,
          paymentId: paymentId,
          id: id,
          message: 'Unknown product type',
        );
        return;
    }
  }

  Future<List<GooglePlayProductDetails>> _getStoreProduct(
      String googlePlayId) async {
    final productDetailResponse = await _inAppPurchase.queryProductDetails({
      googlePlayId,
    });

    if (productDetailResponse.error != null ||
        productDetailResponse.productDetails.isEmpty) {
      Analytics.buyError(
        null,
        paymentSystem,
        paymentId: googlePlayId,
        data: {
          'msg': 'cant get product details ${productDetailResponse.error}',
          'not_found': productDetailResponse.notFoundIDs.join(','),
        },
      );
      return [];
    }

    return productDetailResponse.productDetails.cast();
  }

  Future<bool> _buyInStore(ProductDetails product) async {
    final PurchaseParam purchaseParam = PurchaseParam(productDetails: product);
    product as GooglePlayProductDetails;
    if (product.productDetails.productType == ProductType.inapp) {
      final result = await InAppPurchase.instance.buyConsumable(
        purchaseParam: purchaseParam,
      );
      return result;
    } else {
      final result = InAppPurchase.instance.buyNonConsumable(
        purchaseParam: purchaseParam,
      );
      return result;
    }
  }

  Future<void> completePurchase(PurchaseDetails purchaseDetails) async {
    await InAppPurchase.instance.completePurchase(purchaseDetails);
  }

  Future<void> _onPurchased(PurchaseDetails purchaseDetails) async {
    try {
      final result = await checkPurchase(
        product: MnemoCardsProduct(
          id: purchaseDetails.productID,
          type: MnemoCardsProductType.unknown,
        ),
        paymentToken: purchaseDetails.verificationData.serverVerificationData,
      );
      if (result) {
        Analytics.buyComplete(
          null,
          paymentSystem,
          message: purchaseDetails.productID,
        );
        log('Purchased');
      } else {
        Analytics.buyError(
          null,
          PaymentSystem.yookassa,
          message: 'payment not verified ${purchaseDetails.productID}',
        );
      }
    } catch (e, s) {
      log(e.toString(), stackTrace: s);
    }
  }

  Future<bool> get isAvailable => _inAppPurchase.isAvailable();

  @override
  PaymentSystem get paymentSystem => PaymentSystem.google;

  @override
  Future<bool> checkPurchase({
    required MnemoCardsProduct product,
    required String paymentToken,
  }) async {
    final result = await _repository.checkPayment(
      product: product,
      key: paymentToken,
      paymentSystem: paymentSystem,
    );
    return result;
  }

  Future<void> init() async {
    if (Platform.isAndroid) {
      _subscription = _inAppPurchase.purchaseStream.listen(
        (List<PurchaseDetails> events) {
          Future.forEach(
            events,
            (PurchaseDetails purchaseDetails) async {
              if (purchaseDetails.pendingCompletePurchase ||
                  purchaseDetails.status == PurchaseStatus.purchased) {
                Analytics.buyEvent(
                  null,
                  paymentSystem,
                  message: 'onPurchased',
                  data: {
                    'status': purchaseDetails.status.name,
                    'product': purchaseDetails.productID,
                    'date': purchaseDetails.transactionDate,
                  },
                );
                _onPurchased(purchaseDetails);
              }
            },
          );
        },
      );
    }
  }

  Future<void> dispose() async {
    await _subscription?.cancel();
    _subscription = null;
  }
}