using DomainResults.Common;

using WeatherForecast.Models.Responses;

using DataProviders;

using Core.Enumerations;
using Core.Abstractions;

namespace WeatherForecast.Services {

  /// <summary>
  /// 
  /// </summary>
  public interface IShopCartItemsService {

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <param name="locale"></param>
    /// <returns></returns>
    (List<ShopCartItemResponseModel>?, IDomainResult) Get(Guid siteId, Guid userId, string locale = "en-US");
    
    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <returns></returns>
    IDomainResult Delete(Guid siteId, Guid userId);
  }

  /// <summary>
  /// 
  /// </summary>
  public class ShopCartItemsService : IShopCartItemsService {

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

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

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <param name="locale"></param>
    /// <returns></returns>
    public (List<ShopCartItemResponseModel>?, IDomainResult) Get(Guid siteId, Guid userId, string locale = "en-US") {

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

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

        items.Add(new ShopCartItemResponseModel(item, cartItem, Enumeration.FromDisplayName<Locales>(locale)));
      }

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

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="userId"></param>
    /// <returns></returns>
    public IDomainResult Delete(Guid siteId, Guid userId) => _shopCartDataProvider.DeleteAll(siteId, userId);
  }
}