using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using NLog;
using NzbDrone.Common.Disk;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Instrumentation.Extensions;
using NzbDrone.Core.Configuration;
using NzbDrone.Core.DecisionEngine;
using NzbDrone.Core.Download;
using NzbDrone.Core.Download.TrackedDownloads;
using NzbDrone.Core.MediaFiles.MediaInfo;
using NzbDrone.Core.Messaging.Commands;
using NzbDrone.Core.Messaging.Events;
using NzbDrone.Core.Parser;
using NzbDrone.Core.Parser.Model;
using NzbDrone.Core.Tv;

namespace NzbDrone.Core.MediaFiles.EpisodeImport.Manual
{
    public interface IManualImportService
    {
        List<ManualImportItem> GetMediaFiles(string path, string downloadId);
    }

    public class ManualImportService : IExecute<ManualImportCommand>, IManualImportService
    {
        private readonly IDiskProvider _diskProvider;
        private readonly IParsingService _parsingService;
        private readonly IDiskScanService _diskScanService;
        private readonly IMakeImportDecision _importDecisionMaker;
        private readonly ISeriesService _seriesService;
        private readonly IMovieService _movieService;
        private readonly IEpisodeService _episodeService;
        private readonly IVideoFileInfoReader _videoFileInfoReader;
        private readonly IImportApprovedEpisodes _importApprovedEpisodes;
        private readonly IImportApprovedMovie _importApprovedMovie;
        private readonly ITrackedDownloadService _trackedDownloadService;
        private readonly IDownloadedMovieImportService _downloadedMovieImportService;
        private readonly IEventAggregator _eventAggregator;
        private readonly IConfigService _config;
        private readonly Logger _logger;

        public ManualImportService(IDiskProvider diskProvider,
                                   IParsingService parsingService,
                                   IDiskScanService diskScanService,
                                   IMakeImportDecision importDecisionMaker,
                                   ISeriesService seriesService,
                                   IMovieService movieService,
                                   IEpisodeService episodeService,
                                   IVideoFileInfoReader videoFileInfoReader,
                                   IImportApprovedEpisodes importApprovedEpisodes,
                                   IImportApprovedMovie importApprovedMovie,
                                   ITrackedDownloadService trackedDownloadService,
                                   IDownloadedMovieImportService downloadedMovieImportService,
                                   IEventAggregator eventAggregator,
                                   IConfigService config,
                                   Logger logger)
        {
            _diskProvider = diskProvider;
            _parsingService = parsingService;
            _diskScanService = diskScanService;
            _importDecisionMaker = importDecisionMaker;
            _seriesService = seriesService;
            _movieService = movieService;
            _episodeService = episodeService;
            _videoFileInfoReader = videoFileInfoReader;
            _importApprovedEpisodes = importApprovedEpisodes;
            _importApprovedMovie = importApprovedMovie;
            _trackedDownloadService = trackedDownloadService;
            _downloadedMovieImportService = downloadedMovieImportService;
            _eventAggregator = eventAggregator;
            _config = config;
            _logger = logger;
        }

        public List<ManualImportItem> GetMediaFiles(string path, string downloadId)
        {
            if (downloadId.IsNotNullOrWhiteSpace())
            {
                var trackedDownload = _trackedDownloadService.Find(downloadId);

                if (trackedDownload == null)
                {
                    return new List<ManualImportItem>();
                }

                path = trackedDownload.DownloadItem.OutputPath.FullPath;
            }

            if (!_diskProvider.FolderExists(path))
            {
                if (!_diskProvider.FileExists(path))
                {
                    return new List<ManualImportItem>();
                }

                return new List<ManualImportItem> { ProcessFile(path, downloadId) };
            }

            return ProcessFolder(path, downloadId);
        }

        private List<ManualImportItem> ProcessFolder(string folder, string downloadId)
        {
            var directoryInfo = new DirectoryInfo(folder);
            var series = _parsingService.GetMovie(directoryInfo.Name);

            if (series == null && downloadId.IsNotNullOrWhiteSpace())
            {
                var trackedDownload = _trackedDownloadService.Find(downloadId);
                series = trackedDownload.RemoteMovie.Movie;
            }

            if (series == null)
            {
                var files = _diskScanService.GetVideoFiles(folder);

                return files.Select(file => ProcessFile(file, downloadId, folder)).Where(i => i != null).ToList();
            }

            var folderInfo = Parser.Parser.ParseMovieTitle(directoryInfo.Name, _config.ParsingLeniency > 0);
            var seriesFiles = _diskScanService.GetVideoFiles(folder).ToList();
            var decisions = _importDecisionMaker.GetImportDecisions(seriesFiles, series, folderInfo, SceneSource(series, folder), false);

            return decisions.Select(decision => MapItem(decision, folder, downloadId)).ToList();
        }

        private ManualImportItem ProcessFile(string file, string downloadId, string folder = null)
        {
            if (folder.IsNullOrWhiteSpace())
            {
                folder = new FileInfo(file).Directory.FullName;
            }

            var relativeFile = folder.GetRelativePath(file);

            var movie = _parsingService.GetMovie(relativeFile.Split('\\', '/')[0]);

            if (movie == null)
            {
                movie = _parsingService.GetMovie(relativeFile);
            }

            if (movie == null && downloadId.IsNotNullOrWhiteSpace())
            {
                var trackedDownload = _trackedDownloadService.Find(downloadId);
                movie = trackedDownload.RemoteMovie.Movie;
            }

            if (movie == null)
            {
                var localMovie = new LocalMovie()
                {
                    Path = file,
                    Quality = QualityParser.ParseQuality(file),
                    Size = _diskProvider.GetFileSize(file)
                };

                return MapItem(new ImportDecision(localMovie, new Rejection("Unknown Movie")), folder, downloadId);
            }

            var importDecisions = _importDecisionMaker.GetImportDecisions(new List<string> { file },
                movie, null, SceneSource(movie, folder), true);

            return importDecisions.Any() ? MapItem(importDecisions.First(), folder, downloadId) : new ManualImportItem
                                                                                                  {
                                                                                                      DownloadId = downloadId,
                                                                                                      Path = file,
                                                                                                      RelativePath = folder.GetRelativePath(file),
                                                                                                      Name = Path.GetFileNameWithoutExtension(file),
                                                                                                      Rejections = new List<Rejection>
                                                                                                                   {
                                                                                                                       new Rejection("Unable to process file")
                                                                                                                   }
                                                                                                  };
        }

        //private ManualImportItem ProcessFile(string file, string downloadId, string folder = null)
        //{
        //    if (folder.IsNullOrWhiteSpace())
        //    {
        //        folder = new FileInfo(file).Directory.FullName;
        //    }

        //    var relativeFile = folder.GetRelativePath(file);

        //    var series = _parsingService.GetSeries(relativeFile.Split('\\', '/')[0]);

        //    if (series == null)
        //    {
        //        series = _parsingService.GetSeries(relativeFile);
        //    }

        //    if (series == null && downloadId.IsNotNullOrWhiteSpace())
        //    {
        //        var trackedDownload = _trackedDownloadService.Find(downloadId);
        //        series = trackedDownload.RemoteEpisode.Series;
        //    }

        //    if (series == null)
        //    {
        //        var localEpisode = new LocalEpisode();
        //        localEpisode.Path = file;
        //        localEpisode.Quality = QualityParser.ParseQuality(file);
        //        localEpisode.Size = _diskProvider.GetFileSize(file);

        //        return MapItem(new ImportDecision(localEpisode, new Rejection("Unknown Series")), folder, downloadId);
        //    }

        //    var importDecisions = _importDecisionMaker.GetImportDecisions(new List<string> {file},
        //        series, null, SceneSource(series, folder));

        //    return importDecisions.Any() ? MapItem(importDecisions.First(), folder, downloadId) : null;
        //}

        private bool SceneSource(Series series, string folder)
        {
            return !(series.Path.PathEquals(folder) || series.Path.IsParentPath(folder));
        }

        private bool SceneSource(Movie movie, string folder)
        {
            return !(movie.Path.PathEquals(folder) || movie.Path.IsParentPath(folder));
        }

        //private ManualImportItem MapItem(ImportDecision decision, string folder, string downloadId)
        //{
        //    var item = new ManualImportItem();

        //    item.Path = decision.LocalEpisode.Path;
        //    item.RelativePath = folder.GetRelativePath(decision.LocalEpisode.Path);
        //    item.Name = Path.GetFileNameWithoutExtension(decision.LocalEpisode.Path);
        //    item.DownloadId = downloadId;

        //    if (decision.LocalEpisode.Series != null)
        //    {
        //        item.Series = decision.LocalEpisode.Series;
        //    }

        //    if (decision.LocalEpisode.Episodes.Any())
        //    {
        //        item.SeasonNumber = decision.LocalEpisode.SeasonNumber;
        //        item.Episodes = decision.LocalEpisode.Episodes;
        //    }

        //    item.Quality = decision.LocalEpisode.Quality;
        //    item.Size = _diskProvider.GetFileSize(decision.LocalEpisode.Path);
        //    item.Rejections = decision.Rejections;

        //    return item;
        //}

        private ManualImportItem MapItem(ImportDecision decision, string folder, string downloadId)
        {
            var item = new ManualImportItem();

            item.Path = decision.LocalMovie.Path;
            item.RelativePath = folder.GetRelativePath(decision.LocalMovie.Path);
            item.Name = Path.GetFileNameWithoutExtension(decision.LocalMovie.Path);
            item.DownloadId = downloadId;

            if (decision.LocalMovie.Movie != null)
            {
                item.Movie = decision.LocalMovie.Movie;
            }

            item.Quality = decision.LocalMovie.Quality;
            item.Size = _diskProvider.GetFileSize(decision.LocalMovie.Path);
            item.Rejections = decision.Rejections;

            return item;
        }

        public void Execute(ManualImportCommand message)
        {
            _logger.ProgressTrace("Manually importing {0} files using mode {1}", message.Files.Count, message.ImportMode);

            var imported = new List<ImportResult>();
            var importedTrackedDownload = new List<ManuallyImportedFile>();

            for (int i = 0; i < message.Files.Count; i++)
            {
                _logger.ProgressTrace("Processing file {0} of {1}", i + 1, message.Files.Count);

                var file = message.Files[i];
                var movie = _movieService.GetMovie(file.MovieId);
                var parsedMovieInfo = Parser.Parser.ParseMoviePath(file.Path, _config.ParsingLeniency > 0) ?? new ParsedMovieInfo();
                var mediaInfo = _videoFileInfoReader.GetMediaInfo(file.Path);
                var existingFile = movie.Path.IsParentPath(file.Path);

                var localMovie = new LocalMovie
                {
                    ExistingFile = false,
                    MediaInfo = mediaInfo,
                    ParsedMovieInfo = parsedMovieInfo,
                    Path = file.Path,
                    Quality = file.Quality,
                    Movie = movie,
                    Size = 0
                };

                //TODO: Cleanup non-tracked downloads

                var importDecision = new ImportDecision(localMovie);

                if (file.DownloadId.IsNullOrWhiteSpace())
                {
                    imported.AddRange(_importApprovedMovie.Import(new List<ImportDecision> { importDecision }, !existingFile, null, message.ImportMode));
                }

                else
                {
                    var trackedDownload = _trackedDownloadService.Find(file.DownloadId);
                    var importResult = _importApprovedMovie.Import(new List<ImportDecision> { importDecision }, true, trackedDownload.DownloadItem, message.ImportMode).First();

                    imported.Add(importResult);

                    importedTrackedDownload.Add(new ManuallyImportedFile
                    {
                        TrackedDownload = trackedDownload,
                        ImportResult = importResult
                    });
                }
            }

            _logger.ProgressTrace("Manually imported {0} files", imported.Count);

            foreach (var groupedTrackedDownload in importedTrackedDownload.GroupBy(i => i.TrackedDownload.DownloadItem.DownloadId).ToList())
            {
                var trackedDownload = groupedTrackedDownload.First().TrackedDownload;

                if (_diskProvider.FolderExists(trackedDownload.DownloadItem.OutputPath.FullPath))
                {
                    if (_downloadedMovieImportService.ShouldDeleteFolder(
                            new DirectoryInfo(trackedDownload.DownloadItem.OutputPath.FullPath),
                            trackedDownload.RemoteMovie.Movie) && !trackedDownload.DownloadItem.IsReadOnly)
                    {
                        _diskProvider.DeleteFolder(trackedDownload.DownloadItem.OutputPath.FullPath, true);
                    }
                }

                if (groupedTrackedDownload.Select(c => c.ImportResult).Count(c => c.Result == ImportResultType.Imported) >= Math.Max(1, 1)) //TODO: trackedDownload.RemoteMovie.Movie.Count is always 1?
                {
                    trackedDownload.State = TrackedDownloadStage.Imported;
                    _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload));
                }
            }
        }

        //public void Execute(ManualImportCommand message)
        //{
        //    _logger.ProgressTrace("Manually importing {0} files using mode {1}", message.Files.Count, message.ImportMode);

        //    var imported = new List<ImportResult>();
        //    var importedTrackedDownload = new List<ManuallyImportedFile>();

        //    for (int i = 0; i < message.Files.Count; i++)
        //    {
        //        _logger.ProgressTrace("Processing file {0} of {1}", i + 1, message.Files.Count);

        //        var file = message.Files[i];
        //        var series = _seriesService.GetSeries(file.SeriesId);
        //        var episodes = _episodeService.GetEpisodes(file.EpisodeIds);
        //        var parsedEpisodeInfo = Parser.Parser.ParsePath(file.Path) ?? new ParsedEpisodeInfo();
        //        var mediaInfo = _videoFileInfoReader.GetMediaInfo(file.Path);
        //        var existingFile = series.Path.IsParentPath(file.Path);

        //        var localEpisode = new LocalEpisode
        //        {
        //            ExistingFile = false,
        //            Episodes = episodes,
        //            MediaInfo = mediaInfo,
        //            ParsedEpisodeInfo = parsedEpisodeInfo,
        //            Path = file.Path,
        //            Quality = file.Quality,
        //            Series = series,
        //            Size = 0
        //        };

        //        //TODO: Cleanup non-tracked downloads

        //        var importDecision = new ImportDecision(localEpisode);

        //        if (file.DownloadId.IsNullOrWhiteSpace())
        //        {
        //            imported.AddRange(_importApprovedEpisodes.Import(new List<ImportDecision> { importDecision }, !existingFile, null, message.ImportMode));
        //        }

        //        else
        //        {
        //            var trackedDownload = _trackedDownloadService.Find(file.DownloadId);
        //            var importResult = _importApprovedEpisodes.Import(new List<ImportDecision> { importDecision }, true, trackedDownload.DownloadItem, message.ImportMode).First();

        //            imported.Add(importResult);

        //            importedTrackedDownload.Add(new ManuallyImportedFile
        //                                        {
        //                                            TrackedDownload = trackedDownload,
        //                                            ImportResult = importResult
        //                                        });
        //        }
        //    }

        //    _logger.ProgressTrace("Manually imported {0} files", imported.Count);

        //    foreach (var groupedTrackedDownload in importedTrackedDownload.GroupBy(i => i.TrackedDownload.DownloadItem.DownloadId).ToList())
        //    {
        //        var trackedDownload = groupedTrackedDownload.First().TrackedDownload;

        //        if (_diskProvider.FolderExists(trackedDownload.DownloadItem.OutputPath.FullPath))
        //        {
        //            if (_downloadedEpisodesImportService.ShouldDeleteFolder(
        //                    new DirectoryInfo(trackedDownload.DownloadItem.OutputPath.FullPath),
        //                    trackedDownload.RemoteEpisode.Series) && !trackedDownload.DownloadItem.IsReadOnly)
        //            {
        //                _diskProvider.DeleteFolder(trackedDownload.DownloadItem.OutputPath.FullPath, true);
        //            }
        //        }

        //        if (groupedTrackedDownload.Select(c => c.ImportResult).Count(c => c.Result == ImportResultType.Imported) >= Math.Max(1, trackedDownload.RemoteEpisode.Episodes.Count))
        //        {
        //            trackedDownload.State = TrackedDownloadStage.Imported;
        //            _eventAggregator.PublishEvent(new DownloadCompletedEvent(trackedDownload));
        //        }
        //    }
        //}
    }
}