Rebuilt how AI Studio knows what a model can do (#960)

app/Tests/Models/Corpus/RebuiltRules.cs

@@ -0,0 +1,60 @@
+using AIStudio.Models;
+using AIStudio.Models.Registry;
+using AIStudio.Provider;
+
+namespace AIStudio.Tests.Models.Corpus;
+
+/// <summary>
+/// Asks the rebuilt rules about a corpus entry, in the words the old ones answered in.
+/// </summary>
+/// <remarks>
+/// The two systems say the same things in different shapes: the old one hands out a list of
+/// capabilities, the new one a profile whose reasoning is a field of its own rather than one of
+/// three flags. Comparing them at all needs one of the two translated, and translating the new one
+/// into the old vocabulary is the direction which loses nothing -- the profile knows more, and
+/// everything the old answer could say has a place in it.
+/// </remarks>
+public static class RebuiltRules
+{
+    /// <summary>
+    /// Asks the rebuilt rules about one corpus entry.
+    /// </summary>
+    /// <param name="entry">The entry to ask about.</param>
+    /// <returns>The capabilities, in the vocabulary the old rules answered in.</returns>
+    public static IReadOnlyList<Capability> Ask(CorpusEntry entry) => AsCapabilities(ModelRegistry.Shared.Profile(entry.Provider, entry.ModelId));
+
+    /// <summary>
+    /// Writes a profile as the list of capabilities the old rules would have answered with.
+    /// </summary>
+    /// <remarks>
+    /// The reasoning field turns back into the flag which stands for it. That mapping is the whole
+    /// reason the flags stay in the vocabulary: a person writing an override still says
+    /// ALWAYS_REASONING, and the expert dialog still shows those five choices.
+    /// </remarks>
+    /// <param name="profile">The profile to write out.</param>
+    /// <returns>The capabilities.</returns>
+    public static IReadOnlyList<Capability> AsCapabilities(in ModelProfile profile)
+    {
+        // A profile handed in by reference cannot be reached from inside a query, and copying one
+        // costs nothing:
+        var answered = profile;
+        var stated = Enum.GetValues<Capability>()
+            .Where(capability => capability is not Capability.NONE && answered.Has(capability))
+            .ToList();
+
+        var reasoning = ReasoningAsCapability(profile.Reasoning);
+        if (reasoning is not Capability.NONE)
+            stated.Add(reasoning);
+
+        return stated;
+    }
+
+    private static Capability ReasoningAsCapability(ReasoningSupport reasoning) => reasoning switch
+    {
+        ReasoningSupport.OPTIONAL => Capability.OPTIONAL_REASONING,
+        ReasoningSupport.ON_BY_DEFAULT => Capability.REASONING_BY_DEFAULT,
+        ReasoningSupport.ALWAYS => Capability.ALWAYS_REASONING,
+
+        _ => Capability.NONE,
+    };
+}