using System;
using System.Collections.Generic;
using System.Collections.Specialized;
using System.Globalization;
using System.Linq;
using System.Net;
using System.Text;
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 Newtonsoft.Json.Linq;
using NLog;

namespace Jackett.Common.Indexers.Abstract
{
    public abstract class GazelleTracker : BaseWebIndexer
    {
        protected string LoginUrl => SiteLink + "login.php";
        protected string APIUrl => SiteLink + "ajax.php";
        protected string DownloadUrl => SiteLink + "torrents.php?action=download&usetoken=" + (useTokens ? "1" : "0") + "&id=";
        protected string DetailsUrl => SiteLink + "torrents.php?torrentid=";
        protected bool supportsFreeleechTokens;
        protected bool imdbInTags;
        protected bool supportsCategories = true; // set to false if the tracker doesn't include the categories in the API search results
        protected bool useTokens = false;
        protected string cookie = "";

        private new ConfigurationDataBasicLogin configData
        {
            get => (ConfigurationDataBasicLogin)base.configData;
            set => base.configData = value;
        }

        public GazelleTracker(IIndexerConfigurationService configService, Utils.Clients.WebClient webClient, Logger logger, IProtectionService protectionService, string name, string desc, string link, bool supportsFreeleechTokens, bool imdbInTags = false, bool has2Fa = false)
            : base(name: name,
                description: desc,
                link: link,
                caps: new TorznabCapabilities(),
                configService: configService,
                client: webClient,
                logger: logger,
                p: protectionService,
                configData: new ConfigurationDataBasicLogin())
        {
            Encoding = Encoding.UTF8;
            this.supportsFreeleechTokens = supportsFreeleechTokens;
            this.imdbInTags = imdbInTags;

            if (has2Fa)
            {
                var cookieHint = new ConfigurationData.DisplayItem(
                "<ol><li>(use this only if 2FA is enabled for your account)</li><li>Login to this tracker with your browser<li>Open the <b>DevTools</b> panel by pressing <b>F12</b><li>Select the <b>Network</b> tab<li>Click on the <b>Doc</b> button<li>Refresh the page by pressing <b>F5</b><li>Select the <b>Headers</b> tab<li>Find 'cookie:' in the <b>Request Headers</b> section<li>Copy & paste the whole cookie string to here.</ol>")
                {
                    Name = "CookieHint"
                };
                configData.AddDynamic("cookieHint", cookieHint);
                var cookieItem = new ConfigurationData.StringItem { Value = "" };
                cookieItem.Name = "Cookie";
                configData.AddDynamic("cookie", cookieItem);
            }

            if (supportsFreeleechTokens)
            {
                var useTokenItem = new ConfigurationData.BoolItem { Value = false };
                useTokenItem.Name = "Use Freeleech Tokens when available";
                configData.AddDynamic("usetoken", useTokenItem);
            }
        }

        public override void LoadValuesFromJson(JToken jsonConfig, bool useProtectionService = false)
        {
            base.LoadValuesFromJson(jsonConfig, useProtectionService);

            var cookieItem = (ConfigurationData.StringItem)configData.GetDynamic("cookie");
            if (cookieItem != null)
            {
                cookie = cookieItem.Value;
            }

            var useTokenItem = (ConfigurationData.BoolItem)configData.GetDynamic("usetoken");
            if (useTokenItem != null)
            {
                useTokens = useTokenItem.Value;
            }

        }

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

            var pairs = new Dictionary<string, string> {
                { "username", configData.Username.Value },
                { "password", configData.Password.Value },
                { "keeplogged", "1"},
            };

            if (!string.IsNullOrWhiteSpace(cookie))
            {
                // Cookie was manually supplied
                CookieHeader = cookie;
                try
                {
                    var results = await PerformQuery(new TorznabQuery());
                    if (!results.Any())
                    {
                        throw new Exception("Your cookie did not work");
                    }

                    IsConfigured = true;
                    SaveConfig();
                    return IndexerConfigurationStatus.Completed;
                }
                catch (Exception e)
                {
                    IsConfigured = false;
                    throw new Exception("Your cookie did not work: " + e.Message);
                }
            }

            var response = await RequestLoginAndFollowRedirect(LoginUrl, pairs, string.Empty, true, SiteLink);
            await ConfigureIfOK(response.Cookies, response.Content != null && response.Content.Contains("logout.php"), () =>
            {
                var loginResultParser = new HtmlParser();
                var loginResultDocument = loginResultParser.ParseDocument(response.Content);
                var loginform = loginResultDocument.QuerySelector("#loginform");
                if (loginform == null)
                    throw new ExceptionWithConfigData(response.Content, configData);

                loginform.QuerySelector("table").Remove();
                var errorMessage = loginform.TextContent.Replace("\n\t", " ").Trim();
                throw new ExceptionWithConfigData(errorMessage, configData);
            });
            return IndexerConfigurationStatus.RequiresTesting;
        }

        // hook to adjust the search term
        protected virtual string GetSearchTerm(TorznabQuery query) => query.GetQueryString();

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

            var searchUrl = APIUrl;
            var queryCollection = new NameValueCollection();

            queryCollection.Add("action", "browse");
            //queryCollection.Add("group_results", "0"); # results won't include all information
            queryCollection.Add("order_by", "time");
            queryCollection.Add("order_way", "desc");


            if (!string.IsNullOrWhiteSpace(query.ImdbID))
            {
                if (imdbInTags)
                    queryCollection.Add("taglist", query.ImdbID);
                else
                    queryCollection.Add("cataloguenumber", query.ImdbID);
            }
            else if (!string.IsNullOrWhiteSpace(searchString))
            {
                queryCollection.Add("searchstr", searchString);
            }

            if (query.Artist != null)
                queryCollection.Add("artistname", query.Artist);

            if (query.Label != null)
                queryCollection.Add("recordlabel", query.Label);

            if (query.Year != null)
                queryCollection.Add("year", query.Year.ToString());

            if (query.Album != null)
                queryCollection.Add("groupname", query.Album);

            if (supportsCategories)
            {
                foreach (var cat in MapTorznabCapsToTrackers(query))
                {
                    queryCollection.Add("filter_cat[" + cat + "]", "1");
                }
            }

            searchUrl += "?" + queryCollection.GetQueryString();

            var response = await RequestStringWithCookiesAndRetry(searchUrl);

            if (response.IsRedirect || query.IsTest)
            {
                // re-login
                await ApplyConfiguration(null);
                response = await RequestStringWithCookiesAndRetry(searchUrl);
            }

            try
            {
                var json = JObject.Parse(response.Content);
                foreach (JObject r in json["response"]["results"])
                {
                    var groupTime = DateTimeUtil.UnixTimestampToDateTime(long.Parse((string)r["groupTime"]));
                    var groupName = WebUtility.HtmlDecode((string)r["groupName"]);
                    var artist = WebUtility.HtmlDecode((string)r["artist"]);
                    var cover = (string)r["cover"];
                    var tags = r["tags"].ToList();
                    var groupYear = (string)r["groupYear"];
                    var releaseType = (string)r["releaseType"];

                    var release = new ReleaseInfo();

                    release.PublishDate = groupTime;

                    if (!string.IsNullOrEmpty(cover))
                        release.BannerUrl = new Uri(cover);

                    release.Title = "";
                    if (!string.IsNullOrEmpty(artist))
                        release.Title += artist + " - ";
                    release.Title += groupName;
                    if (!string.IsNullOrEmpty(groupYear) && groupYear != "0")
                        release.Title += " [" + groupYear + "]";
                    if (!string.IsNullOrEmpty(releaseType) && releaseType != "Unknown")
                        release.Title += " [" + releaseType + "]";

                    release.Description = "";
                    if (tags != null && tags.Count > 0 && (string)tags[0] != "")
                        release.Description += "Tags: " + string.Join(", ", tags) + "\n";

                    if (imdbInTags)
                    {
                        var imdbTags = tags
                            .Select(tag => ParseUtil.GetImdbID((string)tag))
                            .Where(tag => tag != null);
                        if (imdbTags.Count() == 1)
                            release.Imdb = imdbTags.First();
                    }

                    if (r["torrents"] is JArray)
                    {
                        foreach (JObject torrent in r["torrents"])
                        {
                            var release2 = (ReleaseInfo)release.Clone();
                            FillReleaseInfoFromJson(release2, torrent);
                            if (ReleaseInfoPostParse(release2, torrent, r))
                                releases.Add(release2);
                        }
                    }
                    else
                    {
                        FillReleaseInfoFromJson(release, r);
                        if (ReleaseInfoPostParse(release, r, r))
                            releases.Add(release);
                    }
                }
            }
            catch (Exception ex)
            {
                OnParseError(response.Content, ex);
            }

            return releases;
        }

        // hook to add/modify the parsed information, return false to exclude the torrent from the results
        protected virtual bool ReleaseInfoPostParse(ReleaseInfo release, JObject torrent, JObject result) => true;

        private void FillReleaseInfoFromJson(ReleaseInfo release, JObject torrent)
        {
            var torrentId = torrent["torrentId"];

            var time = (string)torrent["time"];
            if (!string.IsNullOrEmpty(time))
            {
                release.PublishDate = DateTime.ParseExact(time + " +0000", "yyyy-MM-dd HH:mm:ss zzz", CultureInfo.InvariantCulture);
            }

            var flags = new List<string>();

            var format = (string)torrent["format"];
            if (!string.IsNullOrEmpty(format))
                flags.Add(WebUtility.HtmlDecode(format));

            var encoding = (string)torrent["encoding"];
            if (!string.IsNullOrEmpty(encoding))
                flags.Add(encoding);

            if (torrent["hasLog"] != null && (bool)torrent["hasLog"])
            {
                var logScore = (string)torrent["logScore"];
                flags.Add("Log (" + logScore + "%)");
            }

            if (torrent["hasCue"] != null && (bool)torrent["hasCue"])
                flags.Add("Cue");

            // tehconnection.me specific?
            var lang = (string)torrent["lang"];
            if (!string.IsNullOrEmpty(lang) && lang != "---")
                flags.Add(lang);

            var media = (string)torrent["media"];
            if (!string.IsNullOrEmpty(media))
                flags.Add(media);

            // tehconnection.me specific?
            var resolution = (string)torrent["resolution"];
            if (!string.IsNullOrEmpty(resolution))
                flags.Add(resolution);

            // tehconnection.me specific?
            var container = (string)torrent["container"];
            if (!string.IsNullOrEmpty(container))
                flags.Add(container);

            // tehconnection.me specific?
            var codec = (string)torrent["codec"];
            if (!string.IsNullOrEmpty(codec))
                flags.Add(codec);

            // tehconnection.me specific?
            var audio = (string)torrent["audio"];
            if (!string.IsNullOrEmpty(audio))
                flags.Add(audio);

            // tehconnection.me specific?
            var subbing = (string)torrent["subbing"];
            if (!string.IsNullOrEmpty(subbing) && subbing != "---")
                flags.Add(subbing);

            if (torrent["remastered"] != null && (bool)torrent["remastered"])
            {
                var remasterYear = (string)torrent["remasterYear"];
                var remasterTitle = WebUtility.HtmlDecode((string)torrent["remasterTitle"]);
                flags.Add(remasterYear + (!string.IsNullOrEmpty(remasterTitle) ? " " + remasterTitle : ""));
            }

            if (flags.Count > 0)
                release.Title += " " + string.Join(" / ", flags);

            release.Size = (long)torrent["size"];
            release.Seeders = (int)torrent["seeders"];
            release.Peers = (int)torrent["leechers"] + release.Seeders;
            release.Comments = new Uri(DetailsUrl + torrentId);
            release.Guid = release.Comments;
            release.Link = new Uri(DownloadUrl + torrentId);
            var category = (string)torrent["category"];
            if (category == null || category.Contains("Select Category"))
                release.Category = MapTrackerCatToNewznab("1");
            else
                release.Category = MapTrackerCatDescToNewznab(category);
            release.Files = (int)torrent["fileCount"];
            release.Grabs = (int)torrent["snatches"];
            release.DownloadVolumeFactor = 1;
            release.UploadVolumeFactor = 1;
            if ((bool)torrent["isFreeleech"])
            {
                release.DownloadVolumeFactor = 0;
            }
            var isPersonalFreeleech = (bool?)torrent["isPersonalFreeleech"];
            if (isPersonalFreeleech != null && isPersonalFreeleech == true)
            {
                release.DownloadVolumeFactor = 0;
            }
            if ((bool)torrent["isNeutralLeech"])
            {
                release.DownloadVolumeFactor = 0;
                release.UploadVolumeFactor = 0;
            }
        }

        public override async Task<byte[]> Download(Uri link)
        {
            var content = await base.Download(link);

            // Check if we're out of FL tokens/torrent is to large
            // most gazelle trackers will simply return the torrent anyway but e.g. redacted will return an error
            var requestLink = link.ToString();
            if (content.Length >= 1
                && content[0] != 'd' // simple test for torrent vs HTML content
                && requestLink.Contains("usetoken=1"))
            {
                var html = Encoding.GetString(content);
                if (html.Contains("You do not have any freeleech tokens left.")
                    || html.Contains("You do not have enough freeleech tokens left.")
                    || html.Contains("This torrent is too large."))
                {
                    // download again with usetoken=0
                    var requestLinkNew = requestLink.Replace("usetoken=1", "usetoken=0");
                    content = await base.Download(new Uri(requestLinkNew));
                }
            }

            return content;
        }
    }
}