using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
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;
using Newtonsoft.Json.Linq;
using NLog;

namespace Jackett.Common.Indexers
{
    public class SolidTorrents : BaseWebIndexer
    {
        private string SearchUrl => SiteLink + "api/v1/search";

        private readonly Dictionary<string, string> APIHeaders = new Dictionary<string, string>()
        {
            {"Accept", "application/json, text/plain, */*"},
        };

        private readonly int MAX_RESULTS_PER_PAGE = 20;
        private readonly int MAX_SEARCH_PAGE_LIMIT = 3; // 20 items per page, 60

        private ConfigurationData ConfigData
        {
            get => configData;
            set => base.configData = value;
        }

        public SolidTorrents(IIndexerConfigurationService configService, WebClient wc, Logger l, IProtectionService ps)
            : base(name: "Solid Torrents",
                   description: "SolidTorrents is a Public torrent meta-search engine",
                   link: "https://solidtorrents.net/",
                   caps: new TorznabCapabilities(),
                   configService: configService,
                   client: wc,
                   logger: l,
                   p: ps,
                   configData: new ConfigurationData())
        {
            Encoding = Encoding.UTF8;
            Language = "en-us";
            Type = "public";

            AddCategoryMapping("Audio", TorznabCatType.Audio);
            AddCategoryMapping("Video", TorznabCatType.Movies);
            AddCategoryMapping("Image", TorznabCatType.OtherMisc);
            AddCategoryMapping("Document", TorznabCatType.BooksComics);
            AddCategoryMapping("eBook", TorznabCatType.BooksEbook);
            AddCategoryMapping("Program", TorznabCatType.PC0day);
            AddCategoryMapping("Android", TorznabCatType.PCPhoneAndroid);
            AddCategoryMapping("Archive", TorznabCatType.Other);
            AddCategoryMapping("Diskimage", TorznabCatType.PCISO);
            AddCategoryMapping("Sourcecode", TorznabCatType.MoviesOther);
            AddCategoryMapping("Database", TorznabCatType.MoviesDVD);
            AddCategoryMapping("Unknown", TorznabCatType.Other);
        }

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

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

            return IndexerConfigurationStatus.Completed;
        }

        private JArray CheckResponse(WebClientStringResult result)
        {
            try
            {
                var json = JsonConvert.DeserializeObject<dynamic>(result.Content);
                if (!(json is JObject) || !(json["results"] is JArray) || json["results"] == null)
                    throw new Exception("Server error");
                return (JArray)json["results"];
            }
            catch (Exception e)
            {
                logger.Error("CheckResponse() Error: ", e.Message);
                throw new ExceptionWithConfigData(result.Content, ConfigData);
            }
        }

        private async Task<JArray> SendSearchRequest(string searchString, string category, int page)
        {
            var queryCollection = new NameValueCollection();
            queryCollection.Add("q", searchString);
            queryCollection.Add("category", category);
            queryCollection.Add("skip", (page * MAX_RESULTS_PER_PAGE).ToString());
            queryCollection.Add("sort", "date");
            queryCollection.Add("fuv", "no");
            var fullSearchUrl = SearchUrl + "?" + queryCollection.GetQueryString();
            var result = await RequestStringWithCookiesAndRetry(fullSearchUrl, null, null, APIHeaders);
            return CheckResponse(result);
        }

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

            var searchString = query.GetQueryString();
            var page = 0;

            var cats = MapTorznabCapsToTrackers(query);
            var category = cats.Count > 0 ? string.Join(",", cats) : "all";

            var isLatestSearch = string.IsNullOrWhiteSpace(searchString);
            var isLastPage = false;

            do
            {
                var result = await SendSearchRequest(searchString, category, page);
                try
                {
                    foreach (var torrent in result)
                    {
                        releases.Add(MakeRelease(torrent));
                    }
                }
                catch (Exception ex)
                {
                    OnParseError(result.ToString(), ex);
                }

                isLastPage = result.Count < MAX_RESULTS_PER_PAGE;
                page++; // update page number

            } while (!isLatestSearch && !isLastPage && page < MAX_SEARCH_PAGE_LIMIT);

            return releases;
        }

        private ReleaseInfo MakeRelease(JToken torrent)
        {
            var release = new ReleaseInfo();

            release.Title = (string)torrent["title"];

            // https://solidtorrents.net/view/5e10885d651df640a70ee826
            release.Comments = new Uri(SiteLink + "view/" + (string)torrent["_id"]);
            release.Guid = release.Comments;

            release.PublishDate = DateTime.Now;
            if (torrent["imported"] != null)
                release.PublishDate = DateTime.Parse((string)torrent["imported"]);

            release.Category = MapTrackerCatToNewznab((string)torrent["category"]);
            release.Size = (long)torrent["size"];

            var swarm = torrent["swarm"];
            release.Seeders = (int)swarm["seeders"];
            release.Peers = release.Seeders + (int)swarm["leechers"];
            release.Grabs = (long)swarm["downloads"];

            release.InfoHash = (string)torrent["infohash"];
            release.MagnetUri = new Uri((string)torrent["magnet"]);

            release.MinimumRatio = 1;
            release.MinimumSeedTime = 172800; // 48 hours
            release.DownloadVolumeFactor = 0;
            release.UploadVolumeFactor = 1;

            return release;
        }
    }
}