using DomainResults.Common;

using DataProviders.Collections;

using Core.Abstractions;

using WeatherForecast.Models.Cetegories.Responses;
using WeatherForecast.Models.Cetegories.Requests;

namespace WeatherForecast.Services {

  /// <summary>
  /// 
  /// </summary>
  public interface ICategoryItemsService {

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="requestData"></param>
    /// <returns></returns>
    (GetCategoryItemsLocalizedResponseModel?, IDomainResult) Get(Guid siteId, GetCategoryItemsLocalizedRequestModel requestData);
  }

  /// <summary>
  /// 
  /// </summary>
  public class CategoryItemsService : ServiceBase<CategoryItemsService>, ICategoryItemsService {

    private readonly ICategoryDataProvider _categoryDataProvider;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="logger"></param>
    /// <param name="categoryDataProvider"></param>
    public CategoryItemsService(
      ILogger<CategoryItemsService> logger,
      ICategoryDataProvider categoryDataProvider
    ) : base(logger) {
      _categoryDataProvider = categoryDataProvider;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="requestData"></param>
    /// <returns></returns>
    public (GetCategoryItemsLocalizedResponseModel?, IDomainResult) Get(Guid siteId, GetCategoryItemsLocalizedRequestModel requestData) {
      
      var (count, getCountResult) = _categoryDataProvider.Count(siteId);
        if (!getCountResult.IsSuccess || count == null)
          return (null, getCountResult);

      var skip = (requestData.CurrentPage - 1) * requestData.ItemsPerPage;
      var take = requestData.ItemsPerPage;

      var totalPages = (int)Math.Ceiling((decimal)count / take);

      var (items, result) = _categoryDataProvider.GetAll(siteId);
        if (!result.IsSuccess || items == null)
          return (null, result);

      return IDomainResult.Success(new GetCategoryItemsLocalizedResponseModel(requestData.CurrentPage, totalPages, items.Select(x =>
        new GetCategoryItemLocalizedResponseModel(x, requestData.Locale)).ToList()));
    }
  }
}