using Core.Abstractions;
using Core.DomainObjects;
using Core.Enumerations;
using DataProviders;
using DomainResults.Common;
using WeatherForecast.Models;
using WeatherForecast.Models.Responses;

namespace WeatherForecast.Services {

  /// <summary>
  /// 
  /// </summary>
  public interface IShopItemsService {

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="category"></param>
    /// <param name="currentPage"></param>
    /// <param name="itemsPerPage"></param>
    /// <param name="locale"></param>
    /// <param name="searchText"></param>
    /// <returns></returns>
    (ShopItemsResponseModel?, IDomainResult) Get(Guid siteId, Guid? category, int currentPage, int itemsPerPage, string? locale, string? searchText);
    
    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <returns></returns>
    IDomainResult Delete(Guid siteId);
  }

  /// <summary>
  /// 
  /// </summary>
  public class ShopItemsService : IShopItemsService {
    private readonly ILogger<ShopItemsService> _logger;
    private readonly IShopCatalogDataProvider _shopCatalogDataProvider;
    private readonly ICategoryDataProvider _categoryDataProvider;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="logger"></param>
    /// <param name="shopCatalogDataprovider"></param>
    /// <param name="categoryDataProvider"></param>
    public ShopItemsService(
      ILogger<ShopItemsService> logger,
      IShopCatalogDataProvider shopCatalogDataprovider,
      ICategoryDataProvider categoryDataProvider
    ) {
      _logger = logger;
      _shopCatalogDataProvider = shopCatalogDataprovider;
      _categoryDataProvider = categoryDataProvider;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="category"></param>
    /// <param name="currentPage"></param>
    /// <param name="itemsPerPage"></param>
    /// <param name="locale"></param>
    /// <param name="searchText"></param>
    /// <returns></returns>
    public (ShopItemsResponseModel?, IDomainResult) Get(Guid siteId, Guid? category, int currentPage, int itemsPerPage, string? locale, string? searchText) {
      var (items, result) = _shopCatalogDataProvider.GetAll(siteId, currentPage > 0 ? ((currentPage - 1) * itemsPerPage) : 0, itemsPerPage);

      if (!result.IsSuccess || items == null)
        return (null, result);


      var shopItems = new List<ShopItemResponseModel>();
      foreach (var item in items) {

        var categories = new List<Category>();
        if (item.Categories != null) {
          foreach (var catId in item.Categories) {
            var (cat, getCategoryResult) = _categoryDataProvider.Get(siteId, catId);
            if (!getCategoryResult.IsSuccess || cat == null)
              return (null, getCategoryResult);

            categories.Add(cat);
          }
        }

        if(locale != null)
          shopItems.Add(new ShopItemResponseModel(item, categories, Enumeration.FromDisplayName<Locales>(locale) ?? Locales.Us));
        else
          shopItems.Add(new ShopItemResponseModel(item, categories));
      }

      return shopItems.Count > 0
        ? IDomainResult.Success(new ShopItemsResponseModel(currentPage, 0, shopItems))
        : IDomainResult.NotFound<ShopItemsResponseModel?>();
    }

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