using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
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.Linq;
using NLog;

namespace Jackett.Common.Indexers
{
    [ExcludeFromCodeCoverage]
    public class AniLibria : BaseWebIndexer
    {
        private static readonly Regex _EpisodeRegex = new Regex(@"(?:[SsEe]?\d{1,4}){1,2}$");

        public AniLibria(IIndexerConfigurationService configService, Utils.Clients.WebClient wc, Logger l, IProtectionService ps, ICacheService cs)
            : base(id: "AniLibria",
                   name: "AniLibria",
                   description: "AniLibria is a Public torrent tracker for anime, voiced on russian by AniLibria team",
                   link: "https://www.anilibria.tv/",
                   caps: new TorznabCapabilities
                   {
                       TvSearchParams = new List<TvSearchParam>
                       {
                           TvSearchParam.Q, TvSearchParam.Season, TvSearchParam.Ep
                       }
                   },
                   configService: configService,
                   client: wc,
                   logger: l,
                   p: ps,
                   cacheService: cs,
                   configData: new ConfigurationDataAniLibria())
        {
            Encoding = Encoding.UTF8;
            Language = "ru-ru";
            Type = "public";

            // Configure the category mappings
            AddCategoryMapping(1, TorznabCatType.TVAnime, "Anime");
        }

        private ConfigurationDataAniLibria Configuration => (ConfigurationDataAniLibria)configData;

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

        // If the search string is empty use the latest releases
        protected override async Task<IEnumerable<ReleaseInfo>> PerformQuery(TorznabQuery query)
            => query.IsTest || string.IsNullOrWhiteSpace(query.SearchTerm)
            ? await FetchNewReleases()
            : await PerformSearch(query);

        private async Task<IEnumerable<ReleaseInfo>> PerformSearch(TorznabQuery query)
        {
            var title = _EpisodeRegex.Replace(query.SearchTerm, string.Empty).TrimEnd();
            var queryParameters = new NameValueCollection
            {
                { "filter", "names,poster.url,code,torrents.list,season.year" },
                { "limit", "100" }
            };
            var response = await RequestWithCookiesAndRetryAsync(Configuration.ApiLink.Value + "/searchTitles?" + queryParameters.GetQueryString() + "&search=" + Uri.EscapeDataString(title));
            if (response.Status != HttpStatusCode.OK)
                throw new WebException($"AniLibria search returned unexpected result. Expected 200 OK but got {response.Status}.", WebExceptionStatus.ProtocolError);

            var results = ParseApiResults(response.ContentString);
            return results.Where(release => query.MatchQueryStringAND(release.Title, null, title));
            ;
        }

        private async Task<IEnumerable<ReleaseInfo>> FetchNewReleases()
        {
            var queryParameters = new NameValueCollection
            {
                { "limit", "100" },
                { "filter", "names,poster.url,code,torrents.list,season.year" }
            };
            var response = await RequestWithCookiesAndRetryAsync(Configuration.ApiLink.Value + "/getUpdates?" + queryParameters.GetQueryString());
            if (response.Status != HttpStatusCode.OK)
                throw new WebException($"AniLibria search returned unexpected result. Expected 200 OK but got {response.Status}.", WebExceptionStatus.ProtocolError);

            return ParseApiResults(response.ContentString);
        }

        private string composeTitle(dynamic json)
        {
            var title = json.names.ru;
            title += " / " + json.names.en;
            if (json.alternative is string)
                title += " / " + json.names.alternative;
            title += " " + json.season.year;
            return title;
        }

        private List<ReleaseInfo> ParseApiResults(string json)
        {
            var releases = new List<ReleaseInfo>();
            foreach (dynamic r in JArray.Parse(json))
            {
                var baseRelease = new ReleaseInfo
                {
                    Title = composeTitle(r),
                    Poster = new Uri(Configuration.StaticLink.Value + r.poster.url),
                    Details = new Uri(SiteLink + "/release/" + r.code + ".html"),
                    DownloadVolumeFactor = 0,
                    UploadVolumeFactor = 1,
                    Category = new[]
                    {
                        TorznabCatType.TVAnime.ID
                    }
                };
                foreach (var t in r.torrents.list)
                {
                    var release = (ReleaseInfo)baseRelease.Clone();
                    release.Title += " [" + t.quality["string"] + "] - " + t.series["string"];
                    release.Size = t.total_size;
                    release.Seeders = t.seeders;
                    release.Peers = t.leechers + t.seeders;
                    release.Grabs = t.downloads;
                    release.Link = new Uri(SiteLink + t.url);
                    release.Guid = new Uri(SiteLink + t.url);
                    release.PublishDate = new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc).AddSeconds(Convert.ToDouble(t.uploaded_timestamp)).ToLocalTime();
                    releases.Add(release);
                }
            }

            return releases;
        }
    }
}