using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using AngleSharp.Dom;
using AngleSharp.Html.Parser;

using Jackett.Common.Models;
using Jackett.Common.Models.IndexerConfig;
using Jackett.Common.Services.Interfaces;
using Jackett.Common.Utils;
using Newtonsoft.Json.Linq;
using NLog;
using WebClient = Jackett.Common.Utils.Clients.WebClient;
using static Jackett.Common.Models.IndexerConfig.ConfigurationData;

namespace Jackett.Common.Indexers
{
    // ReSharper disable once UnusedType.Global
    public class DivxTotal : BaseWebIndexer
    {
        private const int MaxResultsPerPage = 15;
        private const int MaxSearchPageLimit = 3;
        private static class DivxTotalCategories
        {
            public static string Peliculas => "peliculas";
            public static string PeliculasHd => "peliculas-hd";
            public static string Peliculas3D => "peliculas-3-d";
            public static string PeliculasDvdr => "peliculas-dvdr";
            public static string Series => "series";
            public static string Programas => "programas";
            public static string Otros => "otros";
        }
        private static class DivxTotalFizeSizes
        {
            public static long Peliculas => 2147483648; // 2 GB
            public static long PeliculasDvdr => 5368709120; // 5 GB
            public static long Series => 524288000; // 500 MB
            public static long Otros => 524288000; // 500 MB
        }

        public DivxTotal(IIndexerConfigurationService configService, WebClient w, Logger l, IProtectionService ps)
            : base(name: "DivxTotal",
                description: "DivxTotal is a SPANISH site for Movies, TV series and Software",
                link: "https://www.divxtotal.la/",
                caps: new TorznabCapabilities(),
                configService: configService,
                client: w,
                logger: l,
                p: ps,
                configData: new ConfigurationData())
        {
            Encoding = Encoding.UTF8;
            Language = "es-es";
            Type = "public";

            var matchWords = new BoolItem() { Name = "Match words in title", Value = true };
            configData.AddDynamic("MatchWords", matchWords);

            AddCategoryMapping(DivxTotalCategories.Peliculas, TorznabCatType.MoviesSD);
            AddCategoryMapping(DivxTotalCategories.PeliculasHd, TorznabCatType.MoviesSD);
            AddCategoryMapping(DivxTotalCategories.Peliculas3D, TorznabCatType.MoviesHD);
            AddCategoryMapping(DivxTotalCategories.PeliculasDvdr, TorznabCatType.MoviesDVD);
            AddCategoryMapping(DivxTotalCategories.Series, TorznabCatType.TVSD);
            AddCategoryMapping(DivxTotalCategories.Programas, TorznabCatType.PC);
            AddCategoryMapping(DivxTotalCategories.Otros, TorznabCatType.OtherMisc);
        }

        public override async Task<IndexerConfigurationStatus> ApplyConfiguration(JToken configJson)
        {
            configData.LoadValuesFromJson(configJson);
            var releases = await PerformQuery(new TorznabQuery());

            await ConfigureIfOK(string.Empty, releases.Any(), () =>
                throw new Exception("Could not find releases from this URL"));

            return IndexerConfigurationStatus.Completed;
        }

        protected override async Task<IEnumerable<ReleaseInfo>> PerformQuery(TorznabQuery query)
        {
            var releases = new List<ReleaseInfo>();

            var matchWords = ((BoolItem)configData.GetDynamic("MatchWords")).Value;
            matchWords = query.SearchTerm != "" && matchWords;

            // we remove parts from the original query
            query = ParseQuery(query);
            var qc = new NameValueCollection {{"s", query.SearchTerm}};

            var page = 1;
            var isLastPage = false;
            do
            {
                var url = SiteLink + "page/" + page + "/?" + qc.GetQueryString();
                var result = await RequestStringWithCookies(url);

                if (result.Status != HttpStatusCode.OK)
                    throw new ExceptionWithConfigData(result.Content, configData);

                try
                {
                    var searchResultParser = new HtmlParser();
                    var doc = searchResultParser.ParseDocument(result.Content);

                    var table = doc.QuerySelector("table.table");
                    if (table == null)
                        break;
                    var rows = table.QuerySelectorAll("tr");
                    isLastPage = rows.Length -1 < MaxResultsPerPage; // rows includes the header
                    var isHeader = true;
                    foreach (var row in rows)
                    {
                        if (isHeader) {
                            isHeader = false;
                            continue;
                        }

                        await ParseRelease(releases, row, query, matchWords);
                    }
                }
                catch (Exception ex)
                {
                    OnParseError(result.Content, ex);
                }

                page++; // update page number

            } while (!isLastPage && page <= MaxSearchPageLimit);

            return releases;
        }

        public override async Task<byte[]> Download(Uri link)
        {
            // for tv series we already have the link
            var downloadUrl = link.ToString();
            // for other categories we have to do another step
            if (!downloadUrl.EndsWith(".torrent"))
            {
                var result = await RequestStringWithCookies(downloadUrl);

                if (result.Status != HttpStatusCode.OK)
                    throw new ExceptionWithConfigData(result.Content, configData);

                var searchResultParser = new HtmlParser();
                var doc = searchResultParser.ParseDocument(result.Content);

                var onclick = doc.QuerySelector("a[onclick*=\"/download/torrent.php\"]")
                    .GetAttribute("onclick");
                downloadUrl = OnclickToDownloadLink(onclick);
            }

            var content = await base.Download(new Uri(downloadUrl));
            return content;
        }


        private async Task ParseRelease(ICollection<ReleaseInfo> releases, IParentNode row, TorznabQuery query,
            bool matchWords)
        {
            var anchor = row.QuerySelector("a");
            var commentsLink = anchor.GetAttribute("href");
            var title = anchor.TextContent.Trim();
            var cat = commentsLink.Split('/')[3];
            var categories = MapTrackerCatToNewznab(cat);
            var publishStr = row.QuerySelectorAll("td")[2].TextContent.Trim();
            var publishDate = TryToParseDate(publishStr, DateTime.Now);
            var sizeStr = row.QuerySelectorAll("td")[3].TextContent.Trim();

            // return results only for requested categories
            if (query.Categories.Any() && !query.Categories.Contains(categories.First()))
                return;

            // match the words in the query with the titles
            if (matchWords && !CheckTitleMatchWords(query.SearchTerm, title))
                return;

            // parsing is different for each category
            if (cat == DivxTotalCategories.Series)
            {
                await ParseSeriesRelease(releases, query, commentsLink, cat, publishDate);
            } else if (query.Episode == null) // if it's scene series, we don't return other categories
            {
                if (cat == DivxTotalCategories.Peliculas || cat == DivxTotalCategories.PeliculasHd ||
                    cat == DivxTotalCategories.Peliculas3D || cat == DivxTotalCategories.PeliculasDvdr)
                    ParseMovieRelease(releases, query, title, commentsLink, cat, publishDate, sizeStr);
                else
                {
                    var size = TryToParseSize(sizeStr, DivxTotalFizeSizes.Otros);
                    GenerateRelease(releases, title, commentsLink, commentsLink, cat, publishDate, size);
                }
            }
        }

        private async Task ParseSeriesRelease(ICollection<ReleaseInfo> releases, TorznabQuery query,
            string commentsLink, string cat, DateTime publishDate)
        {
            var result = await RequestStringWithCookies(commentsLink);

            if (result.Status != HttpStatusCode.OK)
                throw new ExceptionWithConfigData(result.Content, configData);

            var searchResultParser = new HtmlParser();
            var doc = searchResultParser.ParseDocument(result.Content);

            var tables = doc.QuerySelectorAll("table.table");
            foreach (var table in tables)
            {
                var rows = table.QuerySelectorAll("tr");
                var isHeader = true;
                foreach (var row in rows)
                {
                    if (isHeader) {
                        isHeader = false;
                        continue;
                    }

                    var anchor = row.QuerySelector("a");
                    var episodeTitle = anchor.TextContent.Trim();
                    var onclick = anchor.GetAttribute("onclick");
                    var downloadLink = OnclickToDownloadLink(onclick);
                    var episodePublishStr = row.QuerySelectorAll("td")[3].TextContent.Trim();
                    var episodePublish = TryToParseDate(episodePublishStr, publishDate);

                    // Convert the title to Scene format
                    episodeTitle = ParseDivxTotalSeriesTitle(episodeTitle, query);

                    // if the original query was in scene format, we filter the results to match episode
                    // query.Episode != null means scene title
                    if (query.Episode != null && !episodeTitle.Contains(query.GetEpisodeSearchString()))
                        continue;

                    GenerateRelease(releases, episodeTitle, commentsLink, downloadLink, cat, episodePublish,
                        DivxTotalFizeSizes.Series);
                }
            }
        }

        private void ParseMovieRelease(ICollection<ReleaseInfo> releases, TorznabQuery query, string title,
            string commentsLink, string cat, DateTime publishDate, string sizeStr)
        {
            // parse tags in title, we need to put the year after the real title (before the tags)
            // La Maldicion ( HD-CAM)
            // Mascotas 2 4K (1080p) (DUAL)
            // Dragon Ball Super: Broly [2018] [DVD9] [PAL] [Español]
            var tags = "";
            var queryMatches = Regex.Matches(title, @"[\[\(]([^\]\)]+)[\]\)]", RegexOptions.IgnoreCase);
            foreach (Match m in queryMatches)
            {
                tags += " " + m.Groups[1].Value.Trim();
                title = title.Replace(m.Groups[0].Value, "");
            }
            title = title.Trim();
            title = Regex.Replace(title, " 4K$", "", RegexOptions.IgnoreCase);

            // add the year
            title = query.Year != null ? title + " " + query.Year : title;

            // add the tags
            title += tags.ToUpper();

            // add suffix and calculate the size
            var size = TryToParseSize(sizeStr, DivxTotalFizeSizes.Peliculas);
            if (cat == DivxTotalCategories.Peliculas)
                title += " SPANISH DVDRip XviD";
            else if (cat == DivxTotalCategories.PeliculasHd || cat == DivxTotalCategories.Peliculas3D)
                title += " SPANISH BDRip x264";
            else if (cat == DivxTotalCategories.PeliculasDvdr)
            {
                 title += " SPANISH DVDR";
                 size = TryToParseSize(sizeStr, DivxTotalFizeSizes.PeliculasDvdr);
            }
            else
                throw new Exception("Unknown category " + cat);

            GenerateRelease(releases, title, commentsLink, commentsLink, cat, publishDate, size);
        }

        private void GenerateRelease(ICollection<ReleaseInfo> releases, string title, string commentsLink,
            string downloadLink, string cat, DateTime publishDate, long size)
        {
            // ReSharper disable once UseObjectOrCollectionInitializer
            var release = new ReleaseInfo();

            release.Title = title;
            release.Comments = new Uri(commentsLink);
            release.Link = new Uri(downloadLink);
            release.Guid = release.Link;

            release.Category = MapTrackerCatToNewznab(cat);
            release.PublishDate = publishDate;
            release.Size = size;

            release.Files = 1;

            release.Seeders = 1;
            release.Peers = 2;

            release.MinimumRatio = 1;
            release.MinimumSeedTime = 172800;
            release.DownloadVolumeFactor = 0;
            release.UploadVolumeFactor = 1;

            releases.Add(release);
        }

        private static string OnclickToDownloadLink(string onclick)
        {
            // onclick="post('/download/torrent.php', {u: 'aHR0cHM6Ly93d3cuZGl2eHRvdGF='});"
            var base64EncodedData = onclick.Split('\'')[3];
            var base64EncodedBytes = Convert.FromBase64String(base64EncodedData);
            return Encoding.UTF8.GetString(base64EncodedBytes);
        }

        private static bool CheckTitleMatchWords(string queryStr, string title)
        {
            // this code split the words, remove words with 2 letters or less, remove accents and lowercase
            var queryMatches = Regex.Matches(queryStr, @"\b[\w']*\b");
            var queryWords = from m in queryMatches.Cast<Match>()
                where !string.IsNullOrEmpty(m.Value) && m.Value.Length > 2
                select Encoding.UTF8.GetString(Encoding.GetEncoding("ISO-8859-8").GetBytes(m.Value.ToLower()));

            var titleMatches = Regex.Matches(title, @"\b[\w']*\b");
            var titleWords = from m in titleMatches.Cast<Match>()
                where !string.IsNullOrEmpty(m.Value) && m.Value.Length > 2
                select Encoding.UTF8.GetString(Encoding.GetEncoding("ISO-8859-8").GetBytes(m.Value.ToLower()));
            titleWords = titleWords.ToArray();

            return queryWords.All(word => titleWords.Contains(word));
        }

        private static TorznabQuery ParseQuery(TorznabQuery query)
        {
            // Eg. Marco.Polo.2014.S02E08

            // the season/episode part is already parsed by Jackett
            // query.SanitizedSearchTerm = Marco.Polo.2014.
            // query.Season = 2
            // query.Episode = 8
            var searchTerm = query.SanitizedSearchTerm;

            // replace punctuation symbols with spaces
            // searchTerm = Marco Polo 2014
            searchTerm = Regex.Replace(searchTerm, @"[-._\(\)@/\\\[\]\+\%]", " ");
            searchTerm = Regex.Replace(searchTerm, @"\s+", " ");
            searchTerm = searchTerm.Trim();

            // we parse the year and remove it from search
            // searchTerm = Marco Polo
            // query.Year = 2014
            var r = new Regex("([ ]+([0-9]{4}))$", RegexOptions.IgnoreCase);
            var m = r.Match(searchTerm);
            if (m.Success)
            {
                query.Year = int.Parse(m.Groups[2].Value);
                searchTerm = searchTerm.Replace(m.Groups[1].Value, "");
            }

            // remove some words
            searchTerm = Regex.Replace(searchTerm, @"\b(espa[ñn]ol|spanish|castellano|spa)\b", "", RegexOptions.IgnoreCase);

            query.SearchTerm = searchTerm;
            return query;
        }

        private static string ParseDivxTotalSeriesTitle(string episodeTitle, TorznabQuery query)
        {
            // episodeTitle = American Horror Story6x04
            var newTitle = episodeTitle;
            try
            {
                var r = new Regex("(([0-9]+)x([0-9]+)[^0-9]*)$", RegexOptions.IgnoreCase);
                var m = r.Match(newTitle);
                if (m.Success)
                {
                    var season = "S" + m.Groups[2].Value.PadLeft(2, '0');
                    var episode = "E" + m.Groups[3].Value.PadLeft(2, '0');
                    // if the original query was in scene format, we have to put the year back
                    // query.Episode != null means scene title
                    var year = query.Episode != null && query.Year != null ? " " + query.Year : "";
                    newTitle = newTitle.Replace(m.Groups[1].Value, year + " " + season + episode);
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e);
                throw;
            }
            newTitle += " SPANISH SDTV XviD";
            // return American Horror Story S06E04 SPANISH SDTV XviD
            return newTitle;
        }

        private static DateTime TryToParseDate(string dateToParse, DateTime dateDefault)
        {
            try
            {
                return DateTime.ParseExact(dateToParse, "dd-MM-yyyy", CultureInfo.InvariantCulture);
            }
            catch
            {
                // ignored
            }
            return dateDefault;
        }

        private static long TryToParseSize(string sizeToParse, long sizeDefault)
        {
            try
            { 
                return ReleaseInfo.GetBytes(sizeToParse);
            }
            catch
            {
                // ignored
            }
            return sizeDefault;
        }
    }
}