using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using NLog;
using NzbDrone.Core.Model;
using NzbDrone.Core.Model.Notification;
using NzbDrone.Core.Repository;
using NzbDrone.Core.Repository.Quality;
using Rss;

namespace NzbDrone.Core.Providers
{
    public class RssSyncProvider : IRssSyncProvider
    {
        //Sync with RSS feeds to download files as needed

        private Thread _rssSyncThread;
        private IIndexerProvider _indexerProvider;
        private IRssProvider _rss;
        private ISeriesProvider _series;
        private ISeasonProvider _season;
        private IEpisodeProvider _episode;
        private IHistoryProvider _history;
        private IDownloadProvider _sab;
        private IConfigProvider _configProvider;
        private readonly INotificationProvider _notificationProvider;

        private static readonly Logger Logger = LogManager.GetCurrentClassLogger();

        private ProgressNotification _rssSyncNotification;

        public RssSyncProvider(IIndexerProvider indexerProvider, IRssProvider rss, ISeriesProvider series,
            ISeasonProvider season, IEpisodeProvider episode, IHistoryProvider history, IDownloadProvider sab, INotificationProvider notificationProvider, IConfigProvider configProvider)
        {
            _indexerProvider = indexerProvider;
            _rss = rss;
            _series = series;
            _season = season;
            _episode = episode;
            _history = history;
            _sab = sab;
            _notificationProvider = notificationProvider;
            _configProvider = configProvider;
        }

        #region IRssSyncProvider Members

        public void Begin()
        {
            Logger.Debug("RSS Sync Starting");
            if (_rssSyncThread == null || !_rssSyncThread.IsAlive)
            {
                Logger.Debug("Initializing background sync of RSS Feeds.");
                _rssSyncThread = new Thread(SyncWithRss)
                {
                    Name = "SyncUnmappedFolders",
                    Priority = ThreadPriority.Lowest
                };

                _rssSyncThread.Start();
            }
            else
            {
                Logger.Warn("RSS Sync already in progress. Ignoring request.");
            }

        }

        #endregion

        private void SyncWithRss()
        {
            //Get all enabled RSS providers
            //Download Feeds

            var indexers = _indexerProvider.EnabledIndexers();

            using (_rssSyncNotification = new ProgressNotification("RSS Sync"))
            {
                _notificationProvider.Register(_rssSyncNotification);
                _rssSyncNotification.CurrentStatus = "Starting Scan";
                _rssSyncNotification.ProgressMax = indexers.Count();

                foreach (var i in indexers)
                {
                    Logger.Info("Starting RSS Sync for: {0}", i.IndexerName);
                    //Need to insert the users information in the the URL before trying to use it
                    i.RssUrl = GetUsersUrl(i); //Get the new users specific url (with their information) to use for the Sync

                    if (i.RssUrl == null)
                    {
                        Logger.Debug("Unable to Sync {0}. User Information has not been configured.", i.IndexerName);
                        continue; //Skip this indexer
                    }

                    _rssSyncNotification.CurrentStatus = String.Format("Syncing with RSS Feed: {0}", i.IndexerName);

                    var indexer = new FeedInfoModel(i.IndexerName, i.RssUrl);

                    foreach (RssItem item in _rss.GetFeed(indexer))
                    {
                        NzbInfoModel nzb = Parser.ParseNzbInfo(indexer, item);
                        QueueIfWanted(nzb);
                    }
                }
                _rssSyncNotification.CurrentStatus = "RSS Sync Completed";
                Logger.Info("RSS Sync has successfully completed.");
                Thread.Sleep(3000);
                _rssSyncNotification.Status = ProgressNotificationStatus.Completed;
            }
        }

        private void QueueIfWanted(NzbInfoModel nzb)
        {
            //Do we want this item?
            try
            {
                if (nzb.IsPassworded())
                {
                    Logger.Debug("Skipping Passworded Report {0}", nzb.Title);
                    return;
                }

                var episodeParseResults = Parser.ParseEpisodeInfo(nzb.Title);

                if (episodeParseResults.Count() < 1)
                {
                    Logger.Debug("Unsupported Title: {0}", nzb.Title);
                    return;
                }

                if (episodeParseResults.Count() > 0)
                {
                    //Todo: How to determine if we want the show if the FeedTitle is drastically different from the TitleOnDisk (CSI is one that comes to mind)
                    var series = _series.FindSeries(episodeParseResults[0].SeriesTitle);

                    if (series == null)
                    {
                        Logger.Debug("Show is not being watched: {0}", episodeParseResults[0].SeriesTitle);
                        return;
                    }

                    Logger.Debug("Show is being watched: {0}", series.Title);

                    nzb.TitleFix = GetTitleFix(episodeParseResults, series.SeriesId); //Get the TitleFix so we can use it later
                    nzb.Proper = Parser.ParseProper(nzb.Title);

                    //Loop through the list of the episodeParseResults to ensure that all the episodes are needed)
                    foreach (var episode in episodeParseResults)
                    {
                        //IsEpisodeWanted?
                        var episodeModel = new EpisodeModel();
                        episodeModel.Proper = nzb.Proper;
                        episodeModel.SeriesId = series.SeriesId;
                        episodeModel.SeriesTitle = series.Title;
                        episodeModel.Quality = Parser.ParseQuality(nzb.Title);
                        episodeModel.SeasonNumber = episode.SeasonNumber;
                        episodeModel.EpisodeNumber = episode.EpisodeNumber;

                        if (!_episode.IsNeeded(episodeModel))
                            return;

                        var titleFix = GetTitleFix(new List<EpisodeParseResult> { episode }, episodeModel.SeriesId);
                        _sab.IsInQueue(titleFix);
                    }
                }
            }

            catch (Exception ex)
            {
                Logger.ErrorException("Error Parsing NZB: " + ex.Message, ex);
            }
        }

        private string GetTitleFix(List<EpisodeParseResult> episodes, int seriesId)
        {
            var series = _series.GetSeries(seriesId);

            int seasonNumber = 0;
            string episodeNumbers = String.Empty;
            string episodeTitles = String.Empty;

            foreach (var episode in episodes)
            {
                var episodeInDb = _episode.GetEpisode(seriesId, episode.SeasonNumber, episode.EpisodeNumber);

                if (episodeInDb == null)
                {
                    Logger.Debug("Episode Not found in Database");
                    return String.Format("{0} - {1}x{2:00}", series.Title, episode.SeasonNumber, episode.SeriesTitle);
                }

                seasonNumber = episodeInDb.SeasonNumber;
                episodeNumbers = String.Format("{0}x{1:00}", episodeNumbers, episodeInDb.EpisodeNumber);
                episodeTitles = String.Format("{0} + {1}", episodeTitles, episodeInDb.Title);
            }

            return String.Format("{0} - {1}{2} - {3}", series.Title, seasonNumber, episodeNumbers, episodeTitles);
        }

        private string GetUsersUrl(Indexer indexer)
        {
            if (indexer.IndexerName == "NzbMatrix")
            {
                var nzbMatrixUsername = _configProvider.GetValue("NzbMatrixUsername", String.Empty, false);
                var nzbMatrixApiKey = _configProvider.GetValue("NzbMatrixApiKey", String.Empty, false);

                if (!String.IsNullOrEmpty(nzbMatrixUsername) && !String.IsNullOrEmpty(nzbMatrixApiKey))
                    return indexer.RssUrl.Replace("{USERNAME}", nzbMatrixUsername).Replace("{APIKEY}", nzbMatrixApiKey);

                //Todo: Perform validation at the config level so a user is unable to enable a provider until user details are provided
                return null; //Return Null if Provider is enabled, but user information is not supplied.
            }

            if (indexer.IndexerName == "NzbsOrg")
            {
                var nzbsOrgUId = _configProvider.GetValue("NzbsOrgUId", String.Empty, false);
                var nzbsOrgHash = _configProvider.GetValue("NzbsOrgHash", String.Empty, false);

                if (!String.IsNullOrEmpty(nzbsOrgUId) && !String.IsNullOrEmpty(nzbsOrgHash))
                    return indexer.RssUrl.Replace("{UID}", nzbsOrgUId).Replace("{HASH}", nzbsOrgHash);

                //Todo: Perform validation at the config level so a user is unable to enable a provider until user details are provided
                return null; //Return Null if Provider is enabled, but user information is not supplied.
            }

            if (indexer.IndexerName == "NzbsOrg")
            {
                var nzbsrusUId = _configProvider.GetValue("NzbsrusUId", String.Empty, false);
                var nzbsrusHash = _configProvider.GetValue("NzbsrusHash", String.Empty, false);

                if (!String.IsNullOrEmpty(nzbsrusUId) && !String.IsNullOrEmpty(nzbsrusHash))
                    return indexer.RssUrl.Replace("{UID}", nzbsrusUId).Replace("{HASH}", nzbsrusHash);

                //Todo: Perform validation at the config level so a user is unable to enable a provider until user details are provided
                return null; //Return Null if Provider is enabled, but user information is not supplied.
            }

            return indexer.RssUrl; //Currently other providers do not require user information to be substituted, simply return the RssUrl
        }
    }
}