From 003af19e3f039985ec73565cee3d3ad7345e0e9b Mon Sep 17 00:00:00 2001
From: iiSaLMaN <slmanarendo1950@gmail.com>
Date: Wed, 9 Oct 2019 23:04:34 +0300
Subject: [PATCH] Introduce legacy skin configuration

---
 osu.Game/Skinning/LegacySkin.cs              | 18 ++++++++++++++++--
 osu.Game/Skinning/LegacySkinConfiguration.cs | 20 ++++++++++++++++++++
 2 files changed, 36 insertions(+), 2 deletions(-)
 create mode 100644 osu.Game/Skinning/LegacySkinConfiguration.cs

diff --git a/osu.Game/Skinning/LegacySkin.cs b/osu.Game/Skinning/LegacySkin.cs
index fea15458e4..25703b30dc 100644
--- a/osu.Game/Skinning/LegacySkin.cs
+++ b/osu.Game/Skinning/LegacySkin.cs
@@ -26,6 +26,8 @@ namespace osu.Game.Skinning
         [CanBeNull]
         protected IResourceStore<SampleChannel> Samples;
 
+        protected new LegacySkinConfiguration Configuration => (LegacySkinConfiguration)base.Configuration;
+
         public LegacySkin(SkinInfo skin, IResourceStore<byte[]> storage, AudioManager audioManager)
             : this(skin, new LegacySkinResourceStore<SkinFileInfo>(skin, storage), audioManager, "skin.ini")
         {
@@ -37,9 +39,9 @@ namespace osu.Game.Skinning
             Stream stream = storage?.GetStream(filename);
             if (stream != null)
                 using (LineBufferedReader reader = new LineBufferedReader(stream))
-                    Configuration = new LegacySkinDecoder().Decode(reader);
+                    base.Configuration = new LegacySkinDecoder().Decode(reader);
             else
-                Configuration = new DefaultSkinConfiguration();
+                base.Configuration = new LegacySkinConfiguration { LegacyVersion = LegacySkinConfiguration.LATEST_VERSION };
 
             if (storage != null)
             {
@@ -71,6 +73,18 @@ namespace osu.Game.Skinning
                 case GlobalSkinColour colour:
                     return SkinUtils.As<TValue>(getCustomColour(colour.ToString()));
 
+                case LegacySkinConfigurations legacy:
+                    switch (legacy)
+                    {
+                        case LegacySkinConfigurations.Version:
+                            if (Configuration.LegacyVersion.HasValue)
+                                return SkinUtils.As<TValue>(new BindableDouble(Configuration.LegacyVersion.Value));
+
+                            break;
+                    }
+
+                    break;
+
                 case SkinCustomColourLookup customColour:
                     return SkinUtils.As<TValue>(getCustomColour(customColour.Lookup.ToString()));
 
diff --git a/osu.Game/Skinning/LegacySkinConfiguration.cs b/osu.Game/Skinning/LegacySkinConfiguration.cs
new file mode 100644
index 0000000000..022f613562
--- /dev/null
+++ b/osu.Game/Skinning/LegacySkinConfiguration.cs
@@ -0,0 +1,20 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+namespace osu.Game.Skinning
+{
+    public class LegacySkinConfiguration : DefaultSkinConfiguration
+    {
+        public const double LATEST_VERSION = 2.5;
+
+        /// <summary>
+        /// Legacy version of this skin.
+        /// </summary>
+        public double? LegacyVersion { get; internal set; }
+    }
+
+    public enum LegacySkinConfigurations
+    {
+        Version,
+    }
+}