using AngleSharp;
using AngleSharp.Html.Dom;
using NadekoBot.Core.Services;
using NadekoBot.Modules.Searches.Common;
using Newtonsoft.Json;
using System;
using System.Linq;
using System.Net.Http;
using System.Threading.Tasks;
using Serilog;

namespace NadekoBot.Modules.Searches.Services
{
    public class AnimeSearchService : INService
    {
        private readonly IDataCache _cache;
        private readonly IHttpClientFactory _httpFactory;

        public AnimeSearchService(IDataCache cache, IHttpClientFactory httpFactory)
        {
            _cache = cache;
            _httpFactory = httpFactory;
        }

        public async Task<AnimeResult> GetAnimeData(string query)
        {
            if (string.IsNullOrWhiteSpace(query))
                throw new ArgumentNullException(nameof(query));
            try
            {

                var link = "https://aniapi.nadeko.bot/anime/" + Uri.EscapeDataString(query.Replace("/", " ", StringComparison.InvariantCulture));
                link = link.ToLowerInvariant();
                var (ok, data) = await _cache.TryGetAnimeDataAsync(link).ConfigureAwait(false);
                if (!ok)
                {
                    using (var http = _httpFactory.CreateClient())
                    {
                        data = await http.GetStringAsync(link).ConfigureAwait(false);
                    }
                    await _cache.SetAnimeDataAsync(link, data).ConfigureAwait(false);
                }


                return JsonConvert.DeserializeObject<AnimeResult>(data);
            }
            catch
            {
                return null;
            }
        }

        public async Task<NovelResult> GetNovelData(string query)
        {
            if (string.IsNullOrWhiteSpace(query))
                throw new ArgumentNullException(nameof(query));

            query = query.Replace(" ", "-", StringComparison.InvariantCulture);
            try
            {
                var link = "http://www.novelupdates.com/series/" + Uri.EscapeDataString(query.Replace("/", " ", StringComparison.InvariantCulture));
                link = link.ToLowerInvariant();
                var (ok, data) = await _cache.TryGetNovelDataAsync(link).ConfigureAwait(false);
                if (!ok)
                {
                    var config = Configuration.Default.WithDefaultLoader();
                    using (var document = await BrowsingContext.New(config).OpenAsync(link).ConfigureAwait(false))
                    {
                        var imageElem = document.QuerySelector("div.seriesimg > img");
                        if (imageElem == null)
                            return null;
                        var imageUrl = ((IHtmlImageElement)imageElem).Source;

                        var descElem = document.QuerySelector("div#editdescription > p");
                        var desc = descElem.InnerHtml;

                        var genres = document.QuerySelector("div#seriesgenre").Children
                            .Select(x => x as IHtmlAnchorElement)
                            .Where(x => x != null)
                            .Select(x => $"[{x.InnerHtml}]({x.Href})")
                            .ToArray();

                        var authors = document
                            .QuerySelector("div#showauthors")
                            .Children
                            .Select(x => x as IHtmlAnchorElement)
                            .Where(x => x != null)
                            .Select(x => $"[{x.InnerHtml}]({x.Href})")
                            .ToArray();

                        var score = ((IHtmlSpanElement)document
                            .QuerySelector("h5.seriesother > span.uvotes"))
                            .InnerHtml;

                        var status = document
                            .QuerySelector("div#editstatus")
                            .InnerHtml;
                        var title = document
                            .QuerySelector("div.w-blog-content > div.seriestitlenu")
                            .InnerHtml;

                        var obj = new NovelResult()
                        {
                            Description = desc,
                            Authors = authors,
                            Genres = genres,
                            ImageUrl = imageUrl,
                            Link = link,
                            Score = score,
                            Status = status,
                            Title = title,
                        };

                        await _cache.SetNovelDataAsync(link,
                            JsonConvert.SerializeObject(obj)).ConfigureAwait(false);

                        return obj;
                    }
                }

                return JsonConvert.DeserializeObject<NovelResult>(data);
            }
            catch (Exception ex)
            {
                Log.Error(ex, "Error getting novel data");
                return null;
            }
        }

        public async Task<MangaResult> GetMangaData(string query)
        {
            if (string.IsNullOrWhiteSpace(query))
                throw new ArgumentNullException(nameof(query));
            try
            {

                var link = "https://aniapi.nadeko.bot/manga/" + Uri.EscapeDataString(query.Replace("/", " ", StringComparison.InvariantCulture));
                link = link.ToLowerInvariant();
                var (ok, data) = await _cache.TryGetAnimeDataAsync(link).ConfigureAwait(false);
                if (!ok)
                {
                    using (var http = _httpFactory.CreateClient())
                    {
                        data = await http.GetStringAsync(link).ConfigureAwait(false);
                    }
                    await _cache.SetAnimeDataAsync(link, data).ConfigureAwait(false);
                }


                return JsonConvert.DeserializeObject<MangaResult>(data);
            }
            catch
            {
                return null;
            }
        }
    }
}