import 'dart:async';
import 'dart:math';

import 'package:aitrainer_app/model/cache.dart';
import 'package:aitrainer_app/model/product.dart';
import 'package:aitrainer_app/model/product_test.dart';
import 'package:aitrainer_app/service/logging.dart';
import 'package:aitrainer_app/service/product_test_service.dart';
import 'package:bloc/bloc.dart';
import 'package:equatable/equatable.dart';

part 'sales_event.dart';
part 'sales_state.dart';

class SalesBloc extends Bloc<SalesEvent, SalesState> with Logging {
  List<ProductTest> tests = List();
  List<Product> product2Display = List();
  int productSet = -1;
  SalesBloc() : super(SalesInitial());

  @override
  Stream<SalesState> mapEventToState(
    SalesEvent event,
  ) async* {
    try {
      if (event is SalesLoad) {
        yield SalesLoading();
        this.getProductSet();
        yield SalesReady();
      } else if (event is SalesPurchase) {
        final int productId = event.productId;
        trace("Requesting purchase for" + productId.toString());
        //PlatformPurchaseApi().requestPurchase(null);
      }
    } on Exception catch (ex) {
      yield SalesError(message: ex.toString());
    }
  }

  void getProductSet() {
    int productId = 0;
    this.tests = Cache().productTests;

    if (tests.isEmpty) {
      var rand = Random.secure();
      productSet = rand.nextInt(5) + 1;
    } else {
      trace("Previous ProductTest: " + tests[0].toJson().toString());
      productId = tests[0].productId;
      for (var elem in Cache().products) {
        Product product = elem as Product;
        if (product.productId == productId) {
          productSet = product.productSet;
          break;
        }
      }
    }

    ProductTest productTest = ProductTest();
    trace("ProductSet: " + productSet.toString());
    for (var elem in Cache().products) {
      Product product = elem as Product;
      if (product.productSet == productSet) {
        productId = product.productId;
        product2Display.add(product);
      }
    }

    product2Display.sort((a, b) {
      return a.sort < b.sort ? a.sort : b.sort;
    });

    productTest.productId = productId;
    productTest.customerId = Cache().userLoggedIn.customerId;
    productTest.dateView = DateTime.now();
    ProductTestApi().saveProductTest(productTest);
    Cache().productTests.add(productTest);
  }
}