//
// StreamTagger.cs
//
// Author:
//   Aaron Bockover <abockover@novell.com>
//
// Copyright (C) 2006-2008 Novell, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//

using System;
using System.Text.RegularExpressions;

using Hyena;
using Banshee.IO;
using Banshee.Collection;

namespace Banshee.Streaming
{
    public static class StreamTagger
    {
        // This is a short list of video types that TagLib# might not support but that
        // we want to make sure are recognized as videos
        private static readonly ExtensionSet VideoExtensions = new ExtensionSet (
            "avi", "divx", "dv", "f4p", "f4v", "flv", "m4v", "mkv", "mov", "ogv", "qt", "ts", "webm");

        public static TagLib.File ProcessUri (SafeUri uri)
        {
            try {
                TagLib.File file = Banshee.IO.DemuxVfs.OpenFile (uri.IsLocalPath ? uri.LocalPath : uri.AbsoluteUri,
                    null, TagLib.ReadStyle.Average);

                if ((file.Properties.MediaTypes & TagLib.MediaTypes.Audio) == 0 &&
                    (file.Properties.MediaTypes & TagLib.MediaTypes.Video) == 0) {
                    throw new TagLib.UnsupportedFormatException ("File does not contain video or audio");
                }
                return file;
            } catch (Exception e) {
                Hyena.Log.DebugFormat ("Encountered a problem processing: {0}", uri.AbsoluteUri);
                Hyena.Log.DebugException (e);
                return null;
            }
        }

        private static string Choose (string priority, string fallback)
        {
            return Choose (priority, fallback, false);
        }

        private static string Choose (string priority, string fallback, bool flip)
        {
            return TrimZero (flip
                ? IsNullOrEmpty (fallback) ? priority : fallback
                : IsNullOrEmpty (priority) ? fallback : priority);
        }

        private static bool IsNullOrEmpty (string s)
        {
            return String.IsNullOrEmpty (s) || TrimZero (s).Length == 0;
        }

        private static string TrimZero (string s)
        {
            return s == null || s.IndexOf ('\0') == -1 ? s : s.Split ('\0')[0];
        }

        #pragma warning disable 0169

        private static int Choose (int priority, int fallback)
        {
            return Choose (priority, fallback, false);
        }

        #pragma warning restore 0169

        private static int Choose (int priority, int fallback, bool flip)
        {
            return flip
                ? (fallback <= 0 ? priority : fallback)
                : (priority <= 0 ? fallback : priority);
        }

        private static void FindTrackMediaAttributes (TrackInfo track, TagLib.File file)
        {
            if ((file.Properties.MediaTypes & TagLib.MediaTypes.Audio) != 0) {
                track.MediaAttributes |= TrackMediaAttributes.AudioStream;
            }

            if ((file.Properties.MediaTypes & TagLib.MediaTypes.Video) != 0) {
                track.MediaAttributes |= TrackMediaAttributes.VideoStream;
            }

            if (file.Tag.FirstGenre == "Podcast" || file.Tag.Album == "Podcast") {
                track.MediaAttributes |= TrackMediaAttributes.Podcast;
            }

            // TODO: Actually figure out, if possible at the tag/file level, if
            // the file is actual music, podcast, audiobook, movie, tv show, etc.
            // For now just assume that if it's only audio and not podcast, it's
            // music, since that's what we've just historically assumed on any media type
            if (!track.HasAttribute (TrackMediaAttributes.VideoStream) &&
                !track.HasAttribute (TrackMediaAttributes.Podcast)) {
                track.MediaAttributes |= TrackMediaAttributes.Music;
            } else {
                // If it was already set, unset it
                track.MediaAttributes &= ~TrackMediaAttributes.Music;
            }
        }

        public static void TrackInfoMerge (TrackInfo track, SafeUri uri)
        {
            track.Uri = uri;
            using (var file = StreamTagger.ProcessUri (uri)) {
                TrackInfoMerge (track, file);

                if (file == null) {
                    track.TrackTitle = uri.AbsoluteUri;
                }
            }
        }

        public static void TrackInfoMerge (TrackInfo track, TagLib.File file)
        {
            TrackInfoMerge (track, file, false);
        }

        public static void TrackInfoMerge (TrackInfo track, TagLib.File file, bool preferTrackInfo)
        {
            TrackInfoMerge (track, file, preferTrackInfo, false, false);
        }

        public static void TrackInfoMerge (TrackInfo track, TagLib.File file, bool preferTrackInfo, bool import_rating, bool import_play_count)
        {
            // TODO support these as arrays:
            // Performers[] (track artists), AlbumArtists[], Composers[], Genres[]

            // Note: this should be kept in sync with the metadata written in the SaveToFile method

            if (file != null) {
                track.Uri = new SafeUri (file.Name);
                track.MimeType = file.MimeType;
                track.Duration = file.Properties.Duration;
                track.BitRate  = file.Properties.AudioBitrate;
                track.SampleRate  = file.Properties.AudioSampleRate;
                track.BitsPerSample  = file.Properties.BitsPerSample;

                FindTrackMediaAttributes (track, file);

                track.ArtistName = Choose (file.Tag.JoinedPerformers, track.ArtistName, preferTrackInfo);
                track.ArtistNameSort = Choose (file.Tag.JoinedPerformersSort, track.ArtistNameSort, preferTrackInfo);
                track.ArtistMusicBrainzId = Choose (file.Tag.MusicBrainzArtistId, track.ArtistMusicBrainzId, preferTrackInfo);
                track.AlbumTitle = Choose (file.Tag.Album, track.AlbumTitle, preferTrackInfo);
                track.AlbumTitleSort = Choose (file.Tag.AlbumSort, track.AlbumTitleSort, preferTrackInfo);
                track.AlbumMusicBrainzId = Choose (file.Tag.MusicBrainzReleaseId, track.AlbumMusicBrainzId, preferTrackInfo);
                // AlbumArtist cannot be set until the track is marked as a compilation.
                track.IsCompilation = preferTrackInfo ? track.IsCompilation : IsCompilation (file);
                track.AlbumArtist = Choose (file.Tag.FirstAlbumArtist, track.AlbumArtist, preferTrackInfo);
                track.AlbumArtistSort = Choose (file.Tag.FirstAlbumArtistSort, track.AlbumArtistSort, preferTrackInfo);

                track.TrackTitle = Choose (file.Tag.Title, track.TrackTitle, preferTrackInfo);
                track.TrackTitleSort = Choose (file.Tag.TitleSort, track.TrackTitleSort, preferTrackInfo);
                track.MusicBrainzId = Choose (file.Tag.MusicBrainzTrackId, track.MusicBrainzId, preferTrackInfo);
                track.Genre = Choose (file.Tag.FirstGenre, track.Genre, preferTrackInfo);
                track.Composer = Choose (file.Tag.FirstComposer, track.Composer, preferTrackInfo);
                track.Conductor = Choose (file.Tag.Conductor, track.Conductor, preferTrackInfo);
                track.Grouping = Choose (file.Tag.Grouping, track.Grouping, preferTrackInfo);
                track.Copyright = Choose (file.Tag.Copyright, track.Copyright, preferTrackInfo);
                track.Comment = Choose (file.Tag.Comment, track.Comment, preferTrackInfo);

                track.TrackNumber = Choose ((int)file.Tag.Track, track.TrackNumber, preferTrackInfo);
                track.TrackCount = Choose ((int)file.Tag.TrackCount, track.TrackCount, preferTrackInfo);
                track.DiscNumber = Choose ((int)file.Tag.Disc, track.DiscNumber, preferTrackInfo);
                track.DiscCount = Choose ((int)file.Tag.DiscCount, track.DiscCount, preferTrackInfo);
                track.Year = Choose ((int)file.Tag.Year, track.Year, preferTrackInfo);
                track.Bpm = Choose ((int)file.Tag.BeatsPerMinute, track.Bpm, preferTrackInfo);

                if (import_rating || import_play_count) {
                    int file_rating = 0, file_playcount = 0;
                    StreamRatingTagger.GetRatingAndPlayCount (file, ref file_rating, ref file_playcount);
                    if (import_rating) {
                        track.Rating = Choose (file_rating, track.Rating, preferTrackInfo);
                    }
                    if (import_play_count) {
                        track.PlayCount = Choose (file_playcount, track.PlayCount, preferTrackInfo);
                    }
                }
            } else {
                track.MediaAttributes = TrackMediaAttributes.AudioStream;
                if (track.Uri != null && VideoExtensions.IsMatchingFile (track.Uri.AbsoluteUri)) {
                    track.MediaAttributes |= TrackMediaAttributes.VideoStream;
                }
            }

            track.FileSize = Banshee.IO.File.GetSize (track.Uri);
            track.FileModifiedStamp = Banshee.IO.File.GetModifiedTime (track.Uri);
            track.LastSyncedStamp = DateTime.Now;

            if (String.IsNullOrEmpty (track.TrackTitle)) {
                try {
                    string filename = System.Web.HttpUtility.UrlDecode (
                        System.IO.Path.GetFileNameWithoutExtension (track.Uri.AbsoluteUri));
                    if (!String.IsNullOrEmpty (filename)) {
                        track.TrackTitle = filename;
                    }
                } catch {}
            }

            // TODO look for track number in the file name if not set?
            // TODO could also pull artist/album from folders _iff_ files two levels deep in the MusicLibrary folder
            // TODO these ideas could also be done in an extension that collects such hacks
        }

        private static bool IsCompilation (TagLib.File file)
        {
            try {
                var xiph_tag = file.GetTag(TagLib.TagTypes.Xiph, true) as TagLib.Ogg.XiphComment;
                if (xiph_tag != null && xiph_tag.IsCompilation)
                    return true;
            } catch {}

            try {
                TagLib.Id3v2.Tag id3v2_tag = file.GetTag(TagLib.TagTypes.Id3v2, true) as TagLib.Id3v2.Tag;
                if (id3v2_tag != null && id3v2_tag.IsCompilation)
                    return true;
            } catch {}

            try {
                TagLib.Mpeg4.AppleTag apple_tag = file.GetTag(TagLib.TagTypes.Apple,true) as TagLib.Mpeg4.AppleTag;
                if (apple_tag != null && apple_tag.IsCompilation)
                    return true;
            } catch {}

            // FIXME the FirstAlbumArtist != FirstPerformer check might return true for half the
            // tracks on a compilation album, but false for some
            // TODO checked for 'Soundtrack' (and translated) in the title?
            if (file.Tag.Performers.Length > 0 && file.Tag.AlbumArtists.Length > 0 &&
                (file.Tag.Performers.Length != file.Tag.AlbumArtists.Length ||
                file.Tag.FirstAlbumArtist != file.Tag.FirstPerformer)) {
                return true;
            }
            return false;
        }

        private static void SaveIsCompilation (TagLib.File file, bool is_compilation)
        {
            try {
                var xiph_tag = file.GetTag(TagLib.TagTypes.Xiph, true) as TagLib.Ogg.XiphComment;
                if (xiph_tag != null) {
                    xiph_tag.IsCompilation = is_compilation;
                    return;
                }
            } catch {}

            try {
                TagLib.Id3v2.Tag id3v2_tag = file.GetTag(TagLib.TagTypes.Id3v2, true) as TagLib.Id3v2.Tag;
                if (id3v2_tag != null) {
                    id3v2_tag.IsCompilation = is_compilation;
                    return;
                }
            } catch {}

            try {
                TagLib.Mpeg4.AppleTag apple_tag = file.GetTag(TagLib.TagTypes.Apple,true) as TagLib.Mpeg4.AppleTag;
                if (apple_tag != null) {
                    apple_tag.IsCompilation = is_compilation;
                    return;
                }
            } catch {}
        }

        public static bool SaveToFile (TrackInfo track, bool write_metadata, bool write_rating, bool write_play_count)
        {
            // Note: this should be kept in sync with the metadata read in StreamTagger.cs
            TagLib.File file = ProcessUri (track.Uri);
            if (file == null) {
                return false;
            }

            if (write_metadata) {
                file.Tag.Performers = new string [] { track.ArtistName };
                file.Tag.PerformersSort = new string [] { track.ArtistNameSort };
                file.Tag.Album = track.AlbumTitle;
                file.Tag.AlbumSort = track.AlbumTitleSort;
                file.Tag.MusicBrainzReleaseId = track.AlbumMusicBrainzId;
                file.Tag.AlbumArtists = track.AlbumArtist == null ? new string [0] : new string [] {track.AlbumArtist};
                file.Tag.AlbumArtistsSort = (track.AlbumArtistSort == null ? new string [0] : new string [] {track.AlbumArtistSort});
                file.Tag.MusicBrainzArtistId = track.ArtistMusicBrainzId;
                // Bug in taglib-sharp-2.0.3.0: Crash if you send it a genre of "{ null }"
                // on a song with both ID3v1 and ID3v2 metadata. It's happy with "{}", though.
                // (see http://forum.taglib-sharp.com/viewtopic.php?f=5&t=239 )
                file.Tag.Genres = (track.Genre == null) ? new string[] {} : new string [] { track.Genre };
                file.Tag.Title = track.TrackTitle;
                file.Tag.TitleSort = track.TrackTitleSort;
                file.Tag.MusicBrainzTrackId = track.MusicBrainzId;
                file.Tag.Track = (uint)track.TrackNumber;
                file.Tag.TrackCount = (uint)track.TrackCount;
                file.Tag.Composers = new string [] { track.Composer };
                file.Tag.Conductor = track.Conductor;
                file.Tag.Grouping = track.Grouping;
                file.Tag.Copyright = track.Copyright;
                file.Tag.Comment = track.Comment;
                file.Tag.Disc = (uint)track.DiscNumber;
                file.Tag.DiscCount = (uint)track.DiscCount;
                file.Tag.Year = (uint)track.Year;
                file.Tag.BeatsPerMinute = (uint)track.Bpm;

                SaveIsCompilation (file, track.IsCompilation);
            }

            if (write_rating) {
                // FIXME move StreamRatingTagger to taglib#
                StreamRatingTagger.StoreRating (track.Rating, file);
            }
            if (write_play_count){
                StreamRatingTagger.StorePlayCount (track.PlayCount,file);
            }

            file.Save ();
            file.Dispose ();

            track.FileSize = Banshee.IO.File.GetSize (track.Uri);
            track.FileModifiedStamp = Banshee.IO.File.GetModifiedTime (track.Uri);
            track.LastSyncedStamp = DateTime.Now;
            return true;
        }

        public static void TrackInfoMerge (TrackInfo track, StreamTag tag)
        {
            try {
                switch (tag.Name) {
                    case CommonTags.Artist:
                        track.ArtistName = Choose ((string)tag.Value, track.ArtistName);
                        break;
                    case CommonTags.ArtistSortName:
                    case CommonTags.MusicBrainzSortName:
                        track.ArtistNameSort = Choose ((string)tag.Value, track.ArtistNameSort);
                        break;
                    case CommonTags.Title:
                        //track.TrackTitle = Choose ((string)tag.Value, track.TrackTitle);
                        string title = Choose ((string)tag.Value, track.TrackTitle);

                        // Try our best to figure out common patterns in poor radio metadata.
                        // Often only one tag is sent on track changes inside the stream,
                        // which is title, and usually contains artist and track title, separated
                        // with a " - " string.
                        if (track.IsLive && title.Contains (" - ")) {
                            string [] parts = Regex.Split (title, " - ");
                            track.TrackTitle = parts[1].Trim ();
                            track.ArtistName = parts[0].Trim ();

                            // Often, the title portion contains a postfix with more information
                            // that will confuse lookups, such as "Talk [Studio Version]".
                            // Strip out the [] part.
                            Match match = Regex.Match (track.TrackTitle, "^(.+)[ ]+\\[.*\\]$");
                            if (match.Groups.Count == 2) {
                                track.TrackTitle = match.Groups[1].Value;
                            }
                        } else {
                            track.TrackTitle = title;
                        }
                        break;
                    case CommonTags.TitleSortName:
                        track.TrackTitleSort = Choose ((string)tag.Value, track.TrackTitleSort);
                        break;
                    case CommonTags.Album:
                        track.AlbumTitle = Choose ((string)tag.Value, track.AlbumTitle);
                        break;
                    case CommonTags.AlbumSortName:
                        track.AlbumTitleSort = Choose ((string)tag.Value, track.AlbumTitleSort);
                        break;
                    case CommonTags.Disc:
                    case CommonTags.AlbumDiscNumber:
                        int disc = (int)tag.Value;
                        track.DiscNumber = disc == 0 ? track.DiscNumber : disc;
                        break;
                    case CommonTags.AlbumDiscCount:
                        int count = (int)tag.Value;
                        track.DiscCount = count == 0 ? track.DiscCount : count;
                        break;
                    case CommonTags.Genre:
                        track.Genre = Choose ((string)tag.Value, track.Genre);
                        break;
                    case CommonTags.Composer:
                        track.Composer = Choose ((string)tag.Value, track.Composer);
                        break;
                    case CommonTags.Copyright:
                        track.Copyright = Choose ((string)tag.Value, track.Copyright);
                        break;
                    case CommonTags.LicenseUri:
                        track.LicenseUri = Choose ((string)tag.Value, track.LicenseUri);
                        break;
                    case CommonTags.Comment:
                        track.Comment = Choose ((string)tag.Value, track.Comment);
                        break;
                    case CommonTags.TrackNumber:
                        int track_number = (int)tag.Value;
                        track.TrackNumber = track_number == 0 ? track.TrackNumber : track_number;
                        break;
                    case CommonTags.TrackCount:
                        track.TrackCount = (int)tag.Value;
                        break;
                    case CommonTags.BeatsPerMinute:
                        track.Bpm = (int)tag.Value;
                        break;
                    case CommonTags.Duration:
                        if (tag.Value is TimeSpan) {
                            track.Duration = (TimeSpan)tag.Value;
                        } else {
                            track.Duration = new TimeSpan ((uint)tag.Value * TimeSpan.TicksPerMillisecond);
                        }
                        break;
                    case CommonTags.MoreInfoUri:
                        track.MoreInfoUri = (SafeUri)tag.Value;
                        break;
                    /* No year tag in GST it seems
                    case CommonTags.Year:
                        track.Year = (uint)tag.Value;
                        break;*/
                    case CommonTags.NominalBitrate:
                        track.BitRate = (int)tag.Value;
                        break;
                    case CommonTags.StreamType:
                        track.MimeType = (string)tag.Value;
                        break;
                    case CommonTags.VideoCodec:
                        if (tag.Value != null) {
                            track.MediaAttributes |= TrackMediaAttributes.VideoStream;
                        }
                        break;
                    /*case CommonTags.AlbumCoverId:
                        foreach(string ext in TrackInfo.CoverExtensions) {
                            string path = Paths.GetCoverArtPath((string) tag.Value, "." + ext);
                            if(System.IO.File.Exists(path)) {
                                track.CoverArtFileName = path;
                                break;
                            }
                        }
                        break;*/
                }
            } catch {
            }
        }
    }
}
