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

namespace WeatherForecast.Services {

  /// <summary>
  /// 
  /// </summary>
  public interface IBlogItemService {
    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="requestModel"></param>
    /// <returns></returns>
    (Guid?, IDomainResult) Post(Guid siteId, PostBlogItemRequestModel requestModel);

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <returns></returns>
    (GetBlogItemResponseModel?, IDomainResult) Get(Guid siteId, Guid blogId);

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="slug"></param>
    /// <returns></returns>
    (GetBlogItemResponseModel?, IDomainResult) GetSlug(Guid siteId, string slug);

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <param name="requestData"></param>
    /// <returns></returns>
    (Guid?, IDomainResult) Update(Guid siteId, Guid blogId, PutBlogItemRequestModel requestData);

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <returns></returns>
    IDomainResult Delete(Guid siteId, Guid blogId);
  }

  /// <summary>
  /// 
  /// </summary>
  public class BlogItemService : IBlogItemService {
    private readonly ILogger<BlogItemService> _logger;
    private readonly IBlogCatalogDataProvider _blogCatalogDataProvider;
    private readonly ICategoryDataProvider _categoryDataProvider;

    /// <summary>
    /// 
    /// </summary>
    /// <param name="logger"></param>
    /// <param name="blogCatalogDataProvider"></param>
    /// <param name="categoryDataProvider"></param>
    public BlogItemService(
      ILogger<BlogItemService> logger,
      IBlogCatalogDataProvider blogCatalogDataProvider,
      ICategoryDataProvider categoryDataProvider
    ) {
      _logger = logger;
      _blogCatalogDataProvider = blogCatalogDataProvider;
      _categoryDataProvider = categoryDataProvider;
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="requestModel"></param>
    /// <returns></returns>
    /// <exception cref="NotImplementedException"></exception>
    public (Guid?, IDomainResult) Post(Guid siteId, PostBlogItemRequestModel requestModel) {
      throw new NotImplementedException();
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <returns></returns>
    public (GetBlogItemResponseModel?, IDomainResult) Get(Guid siteId, Guid blogId) {
      var (item, result) = _blogCatalogDataProvider.Get(siteId, blogId);

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

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

        categories.Add(category);
      }

      return IDomainResult.Success(new GetBlogItemResponseModel(item, categories));
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="slug"></param>
    /// <returns></returns>
    public (GetBlogItemResponseModel?, IDomainResult) GetSlug(Guid siteId, string slug) {
      var (item, result) = _blogCatalogDataProvider.GetBySlug(siteId, slug);

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

      var locale = item.L10n.SingleOrDefault(x => x.Slug == slug)?.Locale ?? Locales.Us;

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

        categories.Add(category);
      }

      return IDomainResult.Success(new GetBlogItemResponseModel(item, categories, locale));
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <param name="requestData"></param>
    /// <returns></returns>
    /// <exception cref="NotImplementedException"></exception>
    public (Guid?, IDomainResult) Update(Guid siteId, Guid blogId, PutBlogItemRequestModel requestData) {
      throw new NotImplementedException();
    }

    /// <summary>
    /// 
    /// </summary>
    /// <param name="siteId"></param>
    /// <param name="blogId"></param>
    /// <returns></returns>
    /// <exception cref="NotImplementedException"></exception>
    public IDomainResult Delete(Guid siteId, Guid blogId) {
      throw new NotImplementedException();
    }
  }
}