From b1b4e77178922249b6e523e11110c76472c57bf1 Mon Sep 17 00:00:00 2001
From: Luke Pulverenti <luke.pulverenti@gmail.com>
Date: Wed, 7 Aug 2013 11:59:13 -0400
Subject: [PATCH] reduced property virtualization

---
 .../Entities/Audio/MusicAlbum.cs              |  54 --------
 MediaBrowser.Controller/Entities/BaseItem.cs  |   8 +-
 .../Resolvers/EntityResolutionHelper.cs       |  31 +++--
 .../MediaBrowser.Providers.csproj             |   1 +
 .../Music/AlbumInfoFromSongProvider.cs        | 126 ++++++++++++++++++
 5 files changed, 148 insertions(+), 72 deletions(-)
 create mode 100644 MediaBrowser.Providers/Music/AlbumInfoFromSongProvider.cs

diff --git a/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs b/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
index 36cf995f5d..485afcaef9 100644
--- a/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
+++ b/MediaBrowser.Controller/Entities/Audio/MusicAlbum.cs
@@ -54,24 +54,6 @@ namespace MediaBrowser.Controller.Entities.Audio
             get { return Parent as MusicArtist ?? UnknwonArtist; }
         }
 
-        /// <summary>
-        /// Override to point to first child (song)
-        /// </summary>
-        /// <value>The production year.</value>
-        public override int? ProductionYear
-        {
-            get
-            {
-                var child = Children.FirstOrDefault();
-
-                return child == null ? base.ProductionYear : child.ProductionYear;
-            }
-            set
-            {
-                base.ProductionYear = value;
-            }
-        }
-
         /// <summary>
         /// Override to point to first child (song)
         /// </summary>
@@ -92,24 +74,6 @@ namespace MediaBrowser.Controller.Entities.Audio
             }
         }
 
-        /// <summary>
-        /// Override to point to first child (song)
-        /// </summary>
-        /// <value>The studios.</value>
-        public override List<string> Studios
-        {
-            get
-            {
-                var child = Children.FirstOrDefault();
-
-                return child == null ? base.Studios : child.Studios;
-            }
-            set
-            {
-                base.Studios = value;
-            }
-        }
-
         /// <summary>
         /// Gets or sets the images.
         /// </summary>
@@ -149,24 +113,6 @@ namespace MediaBrowser.Controller.Entities.Audio
             return RecursiveChildren.OfType<Audio>().Any(i => i.HasArtist(artist));
         }
 
-        /// <summary>
-        /// Gets or sets the name.
-        /// </summary>
-        /// <value>The name.</value>
-        public override string Name
-        {
-            get
-            {
-                var song = RecursiveChildren.OfType<Audio>().FirstOrDefault(i => !string.IsNullOrEmpty(i.Album));
-
-                return song == null ? base.Name : song.Album;
-            }
-            set
-            {
-                base.Name = value;
-            }
-        }
-
         /// <summary>
         /// Gets or sets the music brainz release group id.
         /// </summary>
diff --git a/MediaBrowser.Controller/Entities/BaseItem.cs b/MediaBrowser.Controller/Entities/BaseItem.cs
index ab30d9ef73..d8dec46452 100644
--- a/MediaBrowser.Controller/Entities/BaseItem.cs
+++ b/MediaBrowser.Controller/Entities/BaseItem.cs
@@ -532,12 +532,12 @@ namespace MediaBrowser.Controller.Entities
         {
             get { return Genres; }
         }
-        
+
         /// <summary>
         /// Gets or sets the studios.
         /// </summary>
         /// <value>The studios.</value>
-        public virtual List<string> Studios { get; set; }
+        public List<string> Studios { get; set; }
 
         /// <summary>
         /// Gets or sets the genres.
@@ -613,7 +613,7 @@ namespace MediaBrowser.Controller.Entities
         /// Gets or sets the production year.
         /// </summary>
         /// <value>The production year.</value>
-        public virtual int? ProductionYear { get; set; }
+        public int? ProductionYear { get; set; }
 
         /// <summary>
         /// If the item is part of a series, this is it's number in the series.
@@ -1022,7 +1022,7 @@ namespace MediaBrowser.Controller.Entities
             {
                 rating = OfficialRatingForComparison;
             }
-            
+
             if (string.IsNullOrEmpty(rating))
             {
                 return !user.Configuration.BlockNotRated;
diff --git a/MediaBrowser.Controller/Resolvers/EntityResolutionHelper.cs b/MediaBrowser.Controller/Resolvers/EntityResolutionHelper.cs
index 9564bf5a8c..db57544de7 100644
--- a/MediaBrowser.Controller/Resolvers/EntityResolutionHelper.cs
+++ b/MediaBrowser.Controller/Resolvers/EntityResolutionHelper.cs
@@ -70,20 +70,23 @@ namespace MediaBrowser.Controller.Resolvers
         /// <summary>
         /// The audio file extensions
         /// </summary>
-        private static readonly Dictionary<string,string> AudioFileExtensions = new[] { 
-            ".mp3",
-            ".flac",
-            ".wma",
-            ".aac",
-            ".acc",
-            ".m4a",
-            ".m4b",
-            ".wav",
-            ".ape",
-            ".ogg",
-            ".oga"
+        public static readonly string[] AudioFileExtensions = new[]
+            {
+                ".mp3",
+                ".flac",
+                ".wma",
+                ".aac",
+                ".acc",
+                ".m4a",
+                ".m4b",
+                ".wav",
+                ".ape",
+                ".ogg",
+                ".oga"
 
-        }.ToDictionary(i => i, StringComparer.OrdinalIgnoreCase);
+            };
+
+        private static readonly Dictionary<string, string> AudioFileExtensionsDictionary = AudioFileExtensions.ToDictionary(i => i, StringComparer.OrdinalIgnoreCase);
 
         /// <summary>
         /// Determines whether [is audio file] [the specified args].
@@ -99,7 +102,7 @@ namespace MediaBrowser.Controller.Resolvers
                 return false;
             }
 
-            return AudioFileExtensions.ContainsKey(extension);
+            return AudioFileExtensionsDictionary.ContainsKey(extension);
         }
 
         /// <summary>
diff --git a/MediaBrowser.Providers/MediaBrowser.Providers.csproj b/MediaBrowser.Providers/MediaBrowser.Providers.csproj
index 345cf581e7..ce924df06e 100644
--- a/MediaBrowser.Providers/MediaBrowser.Providers.csproj
+++ b/MediaBrowser.Providers/MediaBrowser.Providers.csproj
@@ -66,6 +66,7 @@
     <Compile Include="Movies\OpenMovieDatabaseProvider.cs" />
     <Compile Include="Movies\PersonProviderFromXml.cs" />
     <Compile Include="Movies\TmdbPersonProvider.cs" />
+    <Compile Include="Music\AlbumInfoFromSongProvider.cs" />
     <Compile Include="Music\ArtistProviderFromXml.cs" />
     <Compile Include="Music\ArtistsPostScanTask.cs" />
     <Compile Include="Music\FanArtAlbumProvider.cs" />
diff --git a/MediaBrowser.Providers/Music/AlbumInfoFromSongProvider.cs b/MediaBrowser.Providers/Music/AlbumInfoFromSongProvider.cs
new file mode 100644
index 0000000000..3abdf8a276
--- /dev/null
+++ b/MediaBrowser.Providers/Music/AlbumInfoFromSongProvider.cs
@@ -0,0 +1,126 @@
+using MediaBrowser.Common.Extensions;
+using MediaBrowser.Controller.Configuration;
+using MediaBrowser.Controller.Entities;
+using MediaBrowser.Controller.Entities.Audio;
+using MediaBrowser.Controller.Providers;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.Logging;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace MediaBrowser.Providers.Music
+{
+    public class AlbumInfoFromSongProvider : BaseMetadataProvider
+    {
+        public AlbumInfoFromSongProvider(ILogManager logManager, IServerConfigurationManager configurationManager)
+            : base(logManager, configurationManager)
+        {
+        }
+
+        public override bool Supports(BaseItem item)
+        {
+            return item is MusicAlbum;
+        }
+
+        protected override bool NeedsRefreshInternal(BaseItem item, BaseProviderInfo providerInfo)
+        {
+            // If song metadata has changed
+            if (GetComparisonData((MusicAlbum)item) != providerInfo.FileStamp)
+            {
+                return true;
+            }
+
+            return base.NeedsRefreshInternal(item, providerInfo);
+        }
+        /// <summary>
+        /// Gets the data.
+        /// </summary>
+        /// <param name="album">The album.</param>
+        /// <returns>Guid.</returns>
+        private Guid GetComparisonData(MusicAlbum album)
+        {
+            var songs = album.RecursiveChildren.OfType<Audio>().ToList();
+
+            return GetComparisonData(songs);
+        }
+
+        private Guid GetComparisonData(List<Audio> songs)
+        {
+            var albumNames = songs.Select(i => i.AlbumArtist)
+                .Where(i => !string.IsNullOrEmpty(i))
+                .Distinct(StringComparer.OrdinalIgnoreCase)
+                .ToList();
+
+            var studios = songs.SelectMany(i => i.Studios)
+               .Distinct(StringComparer.OrdinalIgnoreCase)
+               .ToList();
+
+            var genres = songs.SelectMany(i => i.Genres)
+               .Distinct(StringComparer.OrdinalIgnoreCase)
+               .ToList();
+
+            albumNames.AddRange(studios);
+            albumNames.AddRange(genres);
+
+            return string.Join(string.Empty, albumNames.OrderBy(i => i).ToArray()).GetMD5();
+        }
+
+        public override Task<bool> FetchAsync(BaseItem item, bool force, CancellationToken cancellationToken)
+        {
+            var album = (MusicAlbum)item;
+
+            BaseProviderInfo data;
+            if (!item.ProviderData.TryGetValue(Id, out data))
+            {
+                data = new BaseProviderInfo();
+                item.ProviderData[Id] = data;
+            }
+
+            var songs = album.RecursiveChildren.OfType<Audio>().ToList();
+
+            if (!item.LockedFields.Contains(MetadataFields.Name))
+            {
+                var name = songs.Select(i => i.Name).FirstOrDefault(i => !string.IsNullOrEmpty(i));
+
+                if (!string.IsNullOrEmpty(name))
+                {
+                    album.Name = name;
+                }
+            }
+
+            var year = songs.Select(i => i.ProductionYear ?? 1800).FirstOrDefault(i => i != 1800);
+
+            if (year != 1800)
+            {
+                album.ProductionYear = year;
+            }
+
+            if (!item.LockedFields.Contains(MetadataFields.Studios))
+            {
+                album.Studios = songs.SelectMany(i => i.Studios)
+                    .Distinct(StringComparer.OrdinalIgnoreCase)
+                    .ToList();
+            }
+
+            if (!item.LockedFields.Contains(MetadataFields.Genres))
+            {
+                album.Genres = songs.SelectMany(i => i.Genres)
+                    .Distinct(StringComparer.OrdinalIgnoreCase)
+                    .ToList();
+            }
+
+            data.FileStamp = GetComparisonData(songs);
+
+            SetLastRefreshed(item, DateTime.UtcNow);
+            return TrueTaskResult;
+        }
+
+        public override MetadataProviderPriority Priority
+        {
+            get { return MetadataProviderPriority.Second; }
+        }
+    }
+}