using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using CodeHollow.FeedReader;
using SharpRss.Models;
using ToolQit.Extensions;

namespace SharpRss.Services
{
    /// <summary>
    /// Managing RSS feeds and categories.
    /// </summary>
    public class RssService : IDisposable
    {
        public RssService()
        {
            //SetupTestCategoriesAndFeedsAsync();
        }
        private readonly DatabaseService _dbService = new DatabaseService();

        private async void SetupTestCategoriesAndFeedsAsync()
        {
            await _dbService.AddCategoriesAsync(new HashSet<CategoryModel>()
            {
                new CategoryModel() { Name = "All" },
                new CategoryModel() { Name = "RSS" },
                new CategoryModel() { Name = "Tech" },
                new CategoryModel() { Name = "News" }
            });
            await _dbService.AddFeedsAsync(new HashSet<FeedModel>()
            {
                new FeedModel("http://fedoramagazine.org/feed/"),
                new FeedModel("https://www.nasa.gov/rss/dyn/breaking_news.rss"),
                new FeedModel("https://journals.plos.org/plosone/feed/atom"),
                new FeedModel("https://itsfoss.com/feed")
            });
        }

        public async Task<Feed> GetFeedAsync(string rssUrl)
        {
            return await FeedCache.GetFeed(rssUrl);
        }

        public async Task<HashSet<object>> GetAllUnsortedAsync()
        {
            HashSet<object> items = new HashSet<object>();
            var categories = await _dbService.GetCategoriesAsync();
            var feeds = await _dbService.GetFeedsAsync(string.Empty);
            items.UnionWith(categories);
            items.UnionWith(feeds);
            return items;
        }

        public async Task<HashSet<CategoryModel>> GetCategoriesAsync()
        {
            var result = await _dbService.GetCategoriesAsync();
            return result.OrderBy(x => x.Name).ToHashSet();
        }

        public async Task<HashSet<FeedModel>> GetFeedsAsync(CategoryModel? categoryModel = null)
        {
            HashSet<FeedModel> feeds;
            if (categoryModel != null)
                feeds = await _dbService.GetFeedsAsync(categoryModel.CategoryId);
            else
                feeds = await _dbService.GetFeedsAsync();
            return feeds;
        }

        public async void AddCategoryAsync(string name, string? icon, string hexColor)
        {
            CategoryModel categoryModel = new CategoryModel()
            {
                Name = name
            };
            if (icon != null)
                categoryModel.PathIcon = icon;
            if (!hexColor.IsNullEmptyWhiteSpace())
                categoryModel.HexColor = hexColor;
            await _dbService.AddCategoriesAsync(new HashSet<CategoryModel>() { categoryModel });
        }

        public async void AddFeedAsync(string rssUrl, CategoryModel? category = null)
        {
            FeedModel feedModel = new FeedModel(rssUrl, category);
            await _dbService.AddFeedsAsync(new HashSet<FeedModel>() { feedModel });
        }

		public void Dispose()
		{
			_dbService.Dispose();
		}
	}
}