using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using AngleSharp.Html.Parser;
using Jackett.Common.Models;
using Jackett.Common.Models.IndexerConfig;
using Jackett.Common.Services.Interfaces;
using Jackett.Common.Utils;
using Jackett.Common.Utils.Clients;
using Newtonsoft.Json.Linq;
using NLog;

namespace Jackett.Common.Indexers
{
    [ExcludeFromCodeCoverage]
    public class HDTorrents : BaseWebIndexer
    {
        private string SearchUrl => SiteLink + "torrents.php?";
        private string LoginUrl => SiteLink + "login.php";
        private readonly Regex _posterRegex = new Regex(@"src=\\'./([^']+)\\'", RegexOptions.IgnoreCase);
        private readonly HashSet<string> _freeleechRanks = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
        {
            "VIP",
            "Uploader",
            "HD Internal",
            "Moderator",
            "Administrator",
            "Owner"
        };

        public override string[] AlternativeSiteLinks { get; protected set; } =
        {
            "https://hdts.ru/",
            "https://hd-torrents.org/",
            "https://hd-torrents.net/",
            "https://hd-torrents.me/"
        };

        private new ConfigurationDataBasicLogin configData => (ConfigurationDataBasicLogin)base.configData;

        public HDTorrents(IIndexerConfigurationService configService, WebClient w, Logger l, IProtectionService ps,
            ICacheService cs)
            : base(id: "hdtorrents",
                   name: "HD-Torrents",
                   description: "HD-Torrents is a private torrent website with HD torrents and strict rules on their content.",
                   link: "https://hdts.ru/", // Domain https://hdts.ru/ seems more reliable
                   caps: new TorznabCapabilities
                   {
                       TvSearchParams = new List<TvSearchParam>
                       {
                           TvSearchParam.Q, TvSearchParam.Season, TvSearchParam.Ep, TvSearchParam.ImdbId
                       },
                       MovieSearchParams = new List<MovieSearchParam>
                       {
                           MovieSearchParam.Q, MovieSearchParam.ImdbId
                       },
                       MusicSearchParams = new List<MusicSearchParam>
                       {
                           MusicSearchParam.Q
                       }
                   },
                   configService: configService,
                   client: w,
                   logger: l,
                   p: ps,
                   cacheService: cs,
                   configData: new ConfigurationDataBasicLogin(
                       "For best results, change the <b>Torrents per page:</b> setting to <b>100</b> on your account profile."))
        {
            Encoding = Encoding.UTF8;
            Language = "en-us";
            Type = "private";

            // Movie
            AddCategoryMapping("70", TorznabCatType.MoviesUHD, "Movie/UHD/Blu-Ray");
            AddCategoryMapping("1", TorznabCatType.MoviesHD, "Movie/Blu-Ray");
            AddCategoryMapping("71", TorznabCatType.MoviesUHD, "Movie/UHD/Remux");
            AddCategoryMapping("2", TorznabCatType.MoviesHD, "Movie/Remux");
            AddCategoryMapping("5", TorznabCatType.MoviesHD, "Movie/1080p/i");
            AddCategoryMapping("3", TorznabCatType.MoviesHD, "Movie/720p");
            AddCategoryMapping("64", TorznabCatType.MoviesUHD, "Movie/2160p");
            AddCategoryMapping("63", TorznabCatType.Audio, "Movie/Audio Track");

            // TV Show
            AddCategoryMapping("72", TorznabCatType.TVUHD, "TV Show/UHD/Blu-ray");
            AddCategoryMapping("59", TorznabCatType.TVHD, "TV Show/Blu-ray");
            AddCategoryMapping("73", TorznabCatType.TVUHD, "TV Show/UHD/Remux");
            AddCategoryMapping("60", TorznabCatType.TVHD, "TV Show/Remux");
            AddCategoryMapping("30", TorznabCatType.TVHD, "TV Show/1080p/i");
            AddCategoryMapping("38", TorznabCatType.TVHD, "TV Show/720p");
            AddCategoryMapping("65", TorznabCatType.TVUHD, "TV Show/2160p");

            // Music
            AddCategoryMapping("44", TorznabCatType.Audio, "Music/Album");
            AddCategoryMapping("61", TorznabCatType.AudioVideo, "Music/Blu-Ray");
            AddCategoryMapping("62", TorznabCatType.AudioVideo, "Music/Remux");
            AddCategoryMapping("57", TorznabCatType.AudioVideo, "Music/1080p/i");
            AddCategoryMapping("45", TorznabCatType.AudioVideo, "Music/720p");
            AddCategoryMapping("66", TorznabCatType.AudioVideo, "Music/2160p");

            // XXX
            AddCategoryMapping("58", TorznabCatType.XXX, "XXX/Blu-ray");
            AddCategoryMapping("74", TorznabCatType.XXX, "XXX/UHD/Blu-ray");
            AddCategoryMapping("48", TorznabCatType.XXX, "XXX/1080p/i");
            AddCategoryMapping("47", TorznabCatType.XXX, "XXX/720p");
            AddCategoryMapping("67", TorznabCatType.XXX, "XXX/2160p");
        }

        public override async Task<IndexerConfigurationStatus> ApplyConfiguration(JToken configJson)
        {
            LoadValuesFromJson(configJson);

            var loginPage = await RequestWithCookiesAsync(LoginUrl, string.Empty);

            var pairs = new Dictionary<string, string> {
                { "uid", configData.Username.Value },
                { "pwd", configData.Password.Value }
            };

            var result = await RequestLoginAndFollowRedirect(LoginUrl, pairs, loginPage.Cookies, true, null, LoginUrl);

            await ConfigureIfOK(
                result.Cookies, result.ContentString?.Contains("If your browser doesn't have javascript enabled") == true,
                () => throw new ExceptionWithConfigData("Couldn't login", configData));
            return IndexerConfigurationStatus.RequiresTesting;
        }

        protected override async Task<IEnumerable<ReleaseInfo>> PerformQuery(TorznabQuery query)
        {
            var releases = new List<ReleaseInfo>();
            var searchUrl = SearchUrl + string.Join(
                string.Empty, MapTorznabCapsToTrackers(query).Select(cat => $"category[]={cat}&"));
            var queryCollection = new NameValueCollection
            {
                {"search", query.ImdbID ?? query.GetQueryString()},
                {"active", "0"},
                {"options", "0"}
            };

            // manually url encode parenthesis to prevent "hacking" detection
            searchUrl += queryCollection.GetQueryString().Replace("(", "%28").Replace(")", "%29");

            var results = await RequestWithCookiesAndRetryAsync(searchUrl);
            try
            {
                var parser = new HtmlParser();
                var dom = parser.ParseDocument(results.ContentString);

                var userInfo = dom.QuerySelector("table.navus tr");
                var userRank = userInfo.Children[1].TextContent.Replace("Rank:", string.Empty).Trim();
                var hasFreeleech = _freeleechRanks.Contains(userRank);

                var rows = dom.QuerySelectorAll("table.mainblockcontenttt tr:has(td.mainblockcontent)");
                foreach (var row in rows.Skip(1))
                {
                    if (row.Children.Length == 2)
                        continue; // fix bug with search: cohen

                    var mainLink = row.Children[2].QuerySelector("a");
                    var title = mainLink.TextContent;
                    var details = new Uri(SiteLink + mainLink.GetAttribute("href"));

                    var posterMatch = _posterRegex.Match(mainLink.GetAttribute("onmouseover"));
                    var poster = posterMatch.Success ? new Uri(SiteLink + posterMatch.Groups[1].Value.Replace("\\", "/")) : null;

                    var link = new Uri(SiteLink + row.Children[4].FirstElementChild.GetAttribute("href"));
                    var description = row.Children[2].QuerySelector("span").TextContent;
                    var size = ReleaseInfo.GetBytes(row.Children[7].TextContent);

                    var dateTag = row.Children[6].FirstElementChild;
                    var dateString = string.Join(" ", dateTag.Attributes.Select(attr => attr.Name));
                    var publishDate = DateTime.ParseExact(dateString, "dd MMM yyyy HH:mm:ss zz00", CultureInfo.InvariantCulture).ToLocalTime();

                    var catStr = row.FirstElementChild.FirstElementChild.GetAttribute("href").Split('=')[1];
                    var cat = MapTrackerCatToNewznab(catStr);

                    // Sometimes the uploader column is missing, so seeders, leechers, and grabs may be at a different index.
                    // There's room for improvement, but this works for now.
                    var endIndex = row.Children.Length;

                    //Maybe use row.Children.Index(Node) after searching for an element instead?
                    if (row.Children[endIndex - 1].TextContent == "Edit")
                        endIndex -= 1;
                    // moderators get additional delete, recommend and like links
                    else if (row.Children[endIndex - 4].TextContent == "Edit")
                        endIndex -= 4;

                    int? seeders = null;
                    int? peers = null;
                    if (ParseUtil.TryCoerceInt(row.Children[endIndex - 3].TextContent, out var rSeeders))
                    {
                        seeders = rSeeders;
                        if (ParseUtil.TryCoerceInt(row.Children[endIndex - 2].TextContent, out var rLeechers))
                            peers = rLeechers + rSeeders;
                    }

                    var grabs = ParseUtil.TryCoerceLong(row.Children[endIndex - 1].TextContent, out var rGrabs)
                        ? (long?)rGrabs
                        : null;

                    var dlVolumeFactor = 1.0;
                    var upVolumeFactor = 1.0;
                    if (row.QuerySelector("img[src$=\"no_ratio.png\"]") != null)
                    {
                        dlVolumeFactor = 0;
                        upVolumeFactor = 0;
                    }
                    else if (hasFreeleech || row.QuerySelector("img[src$=\"free.png\"]") != null)
                        dlVolumeFactor = 0;
                    else if (row.QuerySelector("img[src$=\"50.png\"]") != null)
                        dlVolumeFactor = 0.5;
                    else if (row.QuerySelector("img[src$=\"25.png\"]") != null)
                        dlVolumeFactor = 0.75;
                    else if (row.QuerySelector("img[src$=\"75.png\"]") != null)
                        dlVolumeFactor = 0.25;

                    var imdbLink = row.QuerySelector("a[href*=\"www.imdb.com/title/\"]")?.GetAttribute("href");
                    var imdb = !string.IsNullOrWhiteSpace(imdbLink) ? ParseUtil.GetLongFromString(imdbLink) : null;

                    var release = new ReleaseInfo
                    {
                        Title = title,
                        Details = details,
                        Guid = details,
                        Link = link,
                        PublishDate = publishDate,
                        Category = cat,
                        Description = description,
                        Poster = poster,
                        Imdb = imdb,
                        Size = size,
                        Grabs = grabs,
                        Seeders = seeders,
                        Peers = peers,
                        DownloadVolumeFactor = dlVolumeFactor,
                        UploadVolumeFactor = upVolumeFactor,
                        MinimumRatio = 1,
                        MinimumSeedTime = 172800 // 48 hours
                    };

                    releases.Add(release);
                }
            }
            catch (Exception ex)
            {
                OnParseError(results.ContentString, ex);
            }

            return releases;
        }
    }
}