using System;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using Gallery.Util;
using Gallery.Util.Interface;
using Gallery.Util.Model;
using Xamarin.Forms;

namespace Gallery.Sources.Danbooru
{
    public class GallerySource : IGallerySource
    {
        public string Name => "Danbooru";
        public string Route => "danbooru";
        public string FlyoutIconKey => "Danbooru";
        public string HomePage => "https://danbooru.donmai.us";

        public async Task<GalleryItem[]> GetRecentItemsAsync(int page)
        {
            var url = $"https://danbooru.donmai.us/posts?page={page}";
            var (result, error) = await NetHelper.RequestObject(url, @return: content => ResolveGalleryItems(content));

            if (result == null || !string.IsNullOrEmpty(error))
            {
                Log.Error("danbooru.content.load", $"failed to load content array, error: {error}");
                return null;
            }

            return result;
        }

        private GalleryItem[] ResolveGalleryItems(string content)
        {
            var regex = new Regex(
                @"<article id=""post_\d+"".+?data-id=""(\d+)"".+?data-tags=""([^""]+?)"".+?" +
                @"data-width=""(\d+?)"" data-height=""(\d+?)"".+?data-source=""([^""]+?)"".+?" +
                @"data-uploader-id=""(\d+?)"".+?data-normalized-source=""([^""]+?)"".+?" +
                @"data-file-url=""([^""]+?)"".+?data-large-file-url=""([^""]+?)""", RegexOptions.Multiline);
            var matches = regex.Matches(content);
            var items = new GalleryItem[matches.Count];
            for (var i = 0; i < items.Length; i++)
            {
                var g = matches[i].Groups;
                items[i] = new GalleryItem(int.Parse(g[1].Value))
                {
                    Tags = g[2].Value.Split(' '),
                    Width = int.Parse(g[3].Value),
                    Height = int.Parse(g[4].Value),
                    UserId = g[6].Value,
                    Source = g[7].Value,
                    RawUrl = g[8].Value,
                    PreviewUrl = g[9].Value
                };
            }
            return items;
        }

        public void SetCookie()
        {
            throw new NotImplementedException();
        }

        public void InitDynamicResources(string family, ResourceDictionary light, ResourceDictionary dark)
        {
            var icon = new FontImageSource
            {
                FontFamily = family,
                Glyph = "\uf5d2",
                Size = 18.0
            };
            light.Add(FlyoutIconKey, icon);
            dark.Add(FlyoutIconKey, icon);
        }
    }
}