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 Jackett.Common.Models;
using Jackett.Common.Models.IndexerConfig.Bespoke;
using Jackett.Common.Services.Interfaces;
using Jackett.Common.Utils;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NLog;

namespace Jackett.Common.Indexers
{
    public class AnimeBytes : BaseCachingWebIndexer
    {
        private string ScrapeUrl { get { return SiteLink + "scrape.php"; } }
        private string TorrentsUrl { get { return SiteLink + "torrents.php"; } }
        public bool AllowRaws { get { return configData.IncludeRaw.Value; } }
        public bool InsertSeason { get { return configData.InsertSeason != null && configData.InsertSeason.Value; } }
        public bool AddSynonyms { get { return configData.AddSynonyms.Value; } }
        public bool FilterSeasonEpisode { get { return configData.FilterSeasonEpisode.Value; } }

        private new ConfigurationDataAnimeBytes configData
        {
            get { return (ConfigurationDataAnimeBytes)base.configData; }
            set { base.configData = value; }
        }

        public AnimeBytes(IIndexerConfigurationService configService, Utils.Clients.WebClient client, Logger l, IProtectionService ps)
            : base(name: "AnimeBytes",
                link: "https://animebytes.tv/",
                description: "Powered by Tentacles",
                configService: configService,
                client: client,
                caps: new TorznabCapabilities(TorznabCatType.TVAnime,
                                              TorznabCatType.Movies,
                                              TorznabCatType.BooksComics,
                                              TorznabCatType.ConsolePSP,
                                              TorznabCatType.ConsoleOther,
                                              TorznabCatType.PCGames,
                                              TorznabCatType.AudioMP3,
                                              TorznabCatType.AudioLossless,
                                              TorznabCatType.AudioOther),
                logger: l,
                p: ps,
                configData: new ConfigurationDataAnimeBytes())
        {
            Encoding = Encoding.UTF8;
            Language = "en-us";
            Type = "private";

            webclient.EmulateBrowser = false; // Animebytes doesn't like fake user agents (issue #1535)
        }

        protected override IEnumerable<ReleaseInfo> FilterResults(TorznabQuery query, IEnumerable<ReleaseInfo> input)
        {
            // Prevent filtering
            return input;
        }

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

            if (configData.Passkey.Value.Length != 32)
                throw new Exception("invalid passkey configured: expected length: 32, got " + configData.Passkey.Value.Length.ToString());

            var results = await PerformQuery(new TorznabQuery());
            if (results.Count() == 0)
            {
                throw new Exception("no results found, please report this bug");
            }

            IsConfigured = true;
            SaveConfig();
            return IndexerConfigurationStatus.Completed;
        }

        private string StripEpisodeNumber(string term)
        {
            // Tracer does not support searching with episode number so strip it if we have one
            term = Regex.Replace(term, @"\W(\dx)?\d?\d$", string.Empty);
            term = Regex.Replace(term, @"\W(S\d\d?E)?\d?\d$", string.Empty);
            return term;
        }

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

            if (ContainsMusicCategories(query.Categories))
            {
                foreach (var result in await GetResults(query, "music", query.SanitizedSearchTerm))
                {
                    releases.Add(result);
                }
            }

            foreach (var result in await GetResults(query, "anime", StripEpisodeNumber(query.SanitizedSearchTerm)))
            {
                releases.Add(result);
            }

            return releases.ToArray();
        }

        private bool ContainsMusicCategories(int[] categories)
        {
            var music = new[]
            {
                TorznabCatType.Audio.ID,
                TorznabCatType.AudioMP3.ID,
                TorznabCatType.AudioLossless.ID,
                TorznabCatType.AudioOther.ID,
                TorznabCatType.AudioForeign.ID
            };

            return categories.Length == 0 || music.Any(categories.Contains);
        }

        private async Task<IEnumerable<ReleaseInfo>> GetResults(TorznabQuery query, string searchType, string searchTerm)
        {
            // The result list
            var releases = new List<ReleaseInfo>();

            var queryCollection = new NameValueCollection();

            var cat = "0";
            var queryCats = MapTorznabCapsToTrackers(query);
            if (queryCats.Count == 1)
            {
                cat = queryCats.First().ToString();
            }

            queryCollection.Add("torrent_pass", configData.Passkey.Value);
            queryCollection.Add("type", searchType);
            queryCollection.Add("searchstr", searchTerm);
            var queryUrl = ScrapeUrl + "?" + queryCollection.GetQueryString();

            // Check cache first so we don't query the server for each episode when searching for each episode in a series.
            lock (cache)
            {
                // Remove old cache items
                CleanCache();

                var cachedResult = cache.Where(i => i.Query == queryUrl).FirstOrDefault();
                if (cachedResult != null)
                    return cachedResult.Results.Select(s => (ReleaseInfo)s.Clone()).ToArray();
            }

            // Get the content from the tracker
            var response = await RequestStringWithCookiesAndRetry(queryUrl);
            if (!response.Content.StartsWith("{")) // not JSON => error
                throw new ExceptionWithConfigData("unexcepted response (not JSON)", configData);
            dynamic json = JsonConvert.DeserializeObject<dynamic>(response.Content);

            // Parse
            try
            {
                if (json["error"] != null)
                    throw new Exception(json["error"].ToString());

                var Matches = (long)json["Matches"];

                if(Matches > 0)
                {
                    var groups = (JArray)json.Groups;

                    foreach (JObject group in groups)
                    {
                        var synonyms = new List<string>();
                        var groupID = (long)group["ID"];
                        var Image = (string)group["Image"];
                        var ImageUrl = (string.IsNullOrWhiteSpace(Image) ? null : new Uri(Image));
                        var Year = (int)group["Year"];
                        var GroupName = (string)group["GroupName"];
                        var SeriesName = (string)group["SeriesName"];
                        var Artists = (string)group["Artists"];

                        var mainTitle = WebUtility.HtmlDecode((string)group["FullName"]);
                        if (SeriesName != null)
                            mainTitle = SeriesName;

                        synonyms.Add(mainTitle);

                        // If the title contains a comma then we can't use the synonyms as they are comma seperated
                        if (!mainTitle.Contains(",") && AddSynonyms)
                        {
                            var symnomnNames = WebUtility.HtmlDecode((string)group["Synonymns"]);

                            if (!string.IsNullOrWhiteSpace(symnomnNames))
                            {
                                foreach (var name in symnomnNames.Split(",".ToCharArray(), StringSplitOptions.RemoveEmptyEntries))
                                {
                                    var theName = name.Trim();
                                    if (!theName.Contains("&#") && !string.IsNullOrWhiteSpace(theName))
                                    {
                                        synonyms.Add(theName);
                                    }
                                }
                            }
                        }

                        List<int> Category = null;
                        var category = (string)group["CategoryName"];

                        var Description = (string)group["Description"];

                        foreach (JObject torrent in group["Torrents"])
                        {
                            var releaseInfo = "S01";
                            string episode = null;
                            int? season = null;
                            var EditionTitle = (string)torrent["EditionData"]["EditionTitle"];
                            if (!string.IsNullOrWhiteSpace(EditionTitle))
                                releaseInfo = WebUtility.HtmlDecode(EditionTitle);

                            Regex SeasonRegEx = new Regex(@"Season (\d+)", RegexOptions.Compiled);
                            var SeasonRegExMatch = SeasonRegEx.Match(releaseInfo);
                            if (SeasonRegExMatch.Success)
                                season = ParseUtil.CoerceInt(SeasonRegExMatch.Groups[1].Value);

                            Regex EpisodeRegEx = new Regex(@"Episode (\d+)", RegexOptions.Compiled);
                            var EpisodeRegExMatch = EpisodeRegEx.Match(releaseInfo);
                            if (EpisodeRegExMatch.Success)
                                episode = EpisodeRegExMatch.Groups[1].Value;

                            releaseInfo = releaseInfo.Replace("Episode ", "");
                            releaseInfo = releaseInfo.Replace("Season ", "S");
                            releaseInfo = releaseInfo.Trim();

                            int test = 0;
                            if (InsertSeason && int.TryParse(releaseInfo, out test) && releaseInfo.Length <= 3)
                            {
                                releaseInfo = "E0" + releaseInfo;
                            }

                            if (FilterSeasonEpisode)
                            {
                                if (query.Season != 0 && season != null && season != query.Season) // skip if season doesn't match
                                    continue;
                                if (query.Episode != null && episode != null && episode != query.Episode) // skip if episode doesn't match
                                    continue;
                            }
                            var torrentID = (long)torrent["ID"];
                            var Property = (string)torrent["Property"];
                            Property = Property.Replace(" | Freeleech", "");
                            var Link = (string)torrent["Link"];
                            var LinkUri = new Uri(Link);
                            var UploadTimeString = (string)torrent["UploadTime"];
                            var UploadTime = DateTime.ParseExact(UploadTimeString, "yyyy-MM-dd HH:mm:ss", CultureInfo.InvariantCulture);
                            var PublushDate = DateTime.SpecifyKind(UploadTime, DateTimeKind.Utc).ToLocalTime();
                            var CommentsLink = TorrentsUrl + "?id=" + groupID.ToString() + "&torrentid=" + torrentID.ToString();
                            var CommentsLinkUri = new Uri(CommentsLink);
                            var Size = (long)torrent["Size"];
                            var Snatched = (long)torrent["Snatched"];
                            var Seeders = (int)torrent["Seeders"];
                            var Leechers = (int)torrent["Leechers"];
                            var FileCount = (long)torrent["FileCount"];
                            var Peers = Seeders + Leechers;

                            var RawDownMultiplier = (int?)torrent["RawDownMultiplier"];
                            if (RawDownMultiplier == null)
                                RawDownMultiplier = 0;
                            var RawUpMultiplier = (int?)torrent["RawUpMultiplier"];
                            if (RawUpMultiplier == null)
                                RawDownMultiplier = 0;

                            if (searchType == "anime")
                            {
                                if (GroupName == "TV Series")
                                    Category = new List<int> { TorznabCatType.TVAnime.ID };

                                // Ignore these categories as they'll cause hell with the matcher
                                // TV Special, OVA, ONA, DVD Special, BD Special

                                if (GroupName == "Movie")
                                    Category = new List<int> { TorznabCatType.Movies.ID };

                                if (category == "Manga" || category == "Oneshot" || category == "Anthology" || category == "Manhwa" || category == "Manhua" || category == "Light Novel")
                                    Category = new List<int> { TorznabCatType.BooksComics.ID };

                                if (category == "Novel" || category == "Artbook")
                                    Category = new List<int> { TorznabCatType.BooksComics.ID };

                                if (category == "Game" || category == "Visual Novel")
                                {
                                    if (Property.Contains(" PSP "))
                                        Category = new List<int> { TorznabCatType.ConsolePSP.ID };
                                    if (Property.Contains("PSX"))
                                        Category = new List<int> { TorznabCatType.ConsoleOther.ID };
                                    if (Property.Contains(" NES "))
                                        Category = new List<int> { TorznabCatType.ConsoleOther.ID };
                                    if (Property.Contains(" PC "))
                                        Category = new List<int> { TorznabCatType.PCGames.ID };
                                }
                            }
                            else if (searchType == "music")
                            {
                                if (category == "Single" || category == "EP" || category == "Album" || category == "Compilation" || category == "Soundtrack" || category == "Remix CD" || category == "PV" || category == "Live Album" || category == "Image CD" || category == "Drama CD" || category == "Vocal CD")
                                {
                                    if (Property.Contains(" Lossless "))
                                        Category = new List<int> { TorznabCatType.AudioLossless.ID };
                                    else if (Property.Contains("MP3"))
                                        Category = new List<int> { TorznabCatType.AudioMP3.ID };
                                    else
                                        Category = new List<int> { TorznabCatType.AudioOther.ID };
                                }
                            }

                            // We dont actually have a release name >.> so try to create one
                            var releaseTags = Property.Split("|".ToCharArray(), StringSplitOptions.RemoveEmptyEntries).ToList();
                            for (int i = releaseTags.Count - 1; i >= 0; i--)
                            {
                                releaseTags[i] = releaseTags[i].Trim();
                                if (string.IsNullOrWhiteSpace(releaseTags[i]))
                                    releaseTags.RemoveAt(i);
                            }

                            var releasegroup = releaseTags.LastOrDefault();
                            if (releasegroup != null && releasegroup.Contains("(") && releasegroup.Contains(")"))
                            {
                                // Skip raws if set
                                if (releasegroup.ToLowerInvariant().StartsWith("raw") && !AllowRaws)
                                {
                                    continue;
                                }

                                var start = releasegroup.IndexOf("(");
                                releasegroup = "[" + releasegroup.Substring(start + 1, (releasegroup.IndexOf(")") - 1) - start) + "] ";
                            }
                            else
                            {
                                releasegroup = string.Empty;
                            }

                            var infoString = "";

                            for (int i = 0; i + 1 < releaseTags.Count(); i++)
                            {
                                if (releaseTags[i] == "Raw" && !AllowRaws)
                                    continue;
                                infoString += "[" + releaseTags[i] + "]";
                            }

                            var MinimumSeedTime = 259200;
                            //  Additional 5 hours per GB
                            MinimumSeedTime += (int)((Size / 1000000000) * 18000);

                            foreach (var title in synonyms)
                            {
                                string releaseTitle = null;
                                if (GroupName == "Movie")
                                {
                                    releaseTitle = string.Format("{0} {1} {2}{3}", title, Year, releasegroup, infoString);
                                }
                                else
                                {
                                    releaseTitle = string.Format("{0}{1} {2} {3}", releasegroup, title, releaseInfo, infoString);
                                }

                                var release = new ReleaseInfo();
                                release.MinimumRatio = 1;
                                release.MinimumSeedTime = MinimumSeedTime;
                                release.Title = releaseTitle;
                                release.Comments = CommentsLinkUri;
                                release.Guid = new Uri(CommentsLinkUri + "&nh=" + StringUtil.Hash(title)); // Sonarr should dedupe on this url - allow a url per name.
                                release.Link = LinkUri;
                                release.BannerUrl = ImageUrl;
                                release.PublishDate = PublushDate;
                                release.Category = Category;
                                release.Description = Description;
                                release.Size = Size;
                                release.Seeders = Seeders;
                                release.Peers = Peers;
                                release.Grabs = Snatched;
                                release.Files = FileCount;
                                release.DownloadVolumeFactor = RawDownMultiplier;
                                release.UploadVolumeFactor = RawUpMultiplier;

                                releases.Add(release);
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                OnParseError(response.Content, ex);
            }

            // Add to the cache
            lock (cache)
            {
                cache.Add(new CachedQueryResult(queryUrl, releases));
            }

            return releases.Select(s => (ReleaseInfo)s.Clone());
        }
    }
}