2 files changed, 70 insertions, 6 deletions
diff --git a/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryModel.cs b/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryModel.cs
index e4ab168e..581a524c 100644
--- a/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryModel.cs
+++ b/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryModel.cs
@@ -1,3 +1,5 @@
+using System;
+
 namespace StardewModdingAPI.Toolkit.Framework.Clients.WebApi
 {
     /// <summary>Metadata about a mod.</summary>
@@ -12,19 +14,50 @@ namespace StardewModdingAPI.Toolkit.Framework.Clients.WebApi
         /// <summary>The mod name.</summary>
         public string Name { get; set; }
 
+        /// <summary>The main version.</summary>
+        public ModEntryVersionModel Main { get; set; }
+
+        /// <summary>The latest optional version, if newer than <see cref="Main"/>.</summary>
+        public ModEntryVersionModel Optional { get; set; }
+
+        /// <summary>The errors that occurred while fetching update data.</summary>
+        public string[] Errors { get; set; } = new string[0];
+
+        /****
+        ** Backwards-compatible fields
+        ****/
         /// <summary>The mod's latest version number.</summary>
-        public string Version { get; set; }
+        [Obsolete("Use " + nameof(ModEntryModel.Main))]
+        internal string Version { get; private set; }
 
         /// <summary>The mod's web URL.</summary>
-        public string Url { get; set; }
+        [Obsolete("Use " + nameof(ModEntryModel.Main))]
+        internal string Url { get; private set; }
 
         /// <summary>The mod's latest optional release, if newer than <see cref="Version"/>.</summary>
-        public string PreviewVersion { get; set; }
+        [Obsolete("Use " + nameof(ModEntryModel.Optional))]
+        internal string PreviewVersion { get; private set; }
 
         /// <summary>The web URL to the mod's latest optional release, if newer than <see cref="Version"/>.</summary>
-        public string PreviewUrl { get; set; }
+        [Obsolete("Use " + nameof(ModEntryModel.Optional))]
+        internal string PreviewUrl { get; private set; }
 
-        /// <summary>The errors that occurred while fetching update data.</summary>
-        public string[] Errors { get; set; } = new string[0];
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Set backwards-compatible fields.</summary>
+        /// <param name="version">The requested API version.</param>
+        public void SetBackwardsCompatibility(ISemanticVersion version)
+        {
+            if (version.IsOlderThan("2.6-beta.19"))
+            {
+                this.Version = this.Main?.Version?.ToString();
+                this.Url = this.Main?.Url;
+
+                this.PreviewVersion = this.Optional?.Version?.ToString();
+                this.PreviewUrl = this.Optional?.Url;
+            }
+        }
     }
 }
diff --git a/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryVersionModel.cs b/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryVersionModel.cs
new file mode 100644
index 00000000..dadb8c10
--- /dev/null
+++ b/src/StardewModdingAPI.Toolkit/Framework/Clients/WebApi/ModEntryVersionModel.cs
@@ -0,0 +1,31 @@
+namespace StardewModdingAPI.Toolkit.Framework.Clients.WebApi
+{
+    /// <summary>Metadata about a version.</summary>
+    public class ModEntryVersionModel
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>The version number.</summary>
+        public ISemanticVersion Version { get; set; }
+
+        /// <summary>The mod page URL.</summary>
+        public string Url { get; set; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        public ModEntryVersionModel() { }
+
+        /// <summary>Construct an instance.</summary>
+        /// <param name="version">The version number.</param>
+        /// <param name="url">The mod page URL.</param>
+        public ModEntryVersionModel(ISemanticVersion version, string url)
+        {
+            this.Version = version;
+            this.Url = url;
+        }
+    }
+}