using DomainResults.Common;

using WeatherForecast.Models.Responses;

using DataProviders;

using Core.Enumerations;

namespace WeatherForecast.Services {

  public interface IShopCartItemsService {
    (List<GetShopCartItemResponseModel>?, IDomainResult) Get(Guid siteId, Guid userId, Locales locale);
    IDomainResult Delete(Guid siteId, Guid userId);
  }

  public class ShopCartItemsService : IShopCartItemsService {

    ILogger<ShopCartItemsService> _logger;
    IShopCatalogDataProvider _shopCatalogDataProvider;
    IShopCartDataProvider _shopCartDataProvider;

    public ShopCartItemsService(
      ILogger<ShopCartItemsService> logger,
      IShopCatalogDataProvider shopCatalogDataProvider,
      IShopCartDataProvider shopCartDataprovider
    ) {
      _logger = logger;
      _shopCatalogDataProvider = shopCatalogDataProvider;
      _shopCartDataProvider = shopCartDataprovider;
    }

    public (List<GetShopCartItemResponseModel>?, IDomainResult) Get(Guid siteId, Guid userId, Locales locale) {

      var (cartItems, getCartItemsResult) = _shopCartDataProvider.GetAll(siteId, userId);
      if (!getCartItemsResult.IsSuccess || cartItems == null)
        return (null, getCartItemsResult);

      var items = new List<GetShopCartItemResponseModel>();
      foreach (var cartItem in cartItems) {
        var (item, result) = _shopCatalogDataProvider.Get(siteId, cartItem.Sku);
        if (!result.IsSuccess || item == null)
          return (null, result);

        items.Add(new GetShopCartItemResponseModel(item, cartItem, locale));
      }

      return items.Count > 0
        ? IDomainResult.Success(items)
        : IDomainResult.NotFound<List<GetShopCartItemResponseModel>?>();
    }

    public IDomainResult Delete(Guid siteId, Guid userId) => _shopCartDataProvider.DeleteAll(siteId, userId);
  }
}