Added logic to determine method member validity and obtain visibility function

MiraAPI/GameOptions/Attributes/ModdedOptionVisibilityAttribute.cs

@@ -24,15 +24,78 @@ public sealed class ModdedOptionVisiblityAttribute(Type? holderType = null, stri
     {
     }
 
-#pragma warning disable S3011 // Reflection should not be used to increase accessibility of classes, methods, or fields
     internal Func<bool>? GetVisibility(AbstractOptionGroup group, PropertyInfo property)
     {
+        MemberInfo? member = GetVisibilityMember(group, property, out Type type);
+
+        if (member is MethodInfo vMethod)
+        {
+            if (vMethod.ReturnType != typeof(bool))
+            {
+                Error($"Method {memberName} does not return a bool.");
+                return null;
+            }
+            var paramList = vMethod.GetParameters();
+            if (paramList.Length > 0)
+            {
+                Error($"Method {memberName} has too many parameters.");
+                return null;
+            }
+
+            return () => (bool)vMethod.Invoke(group, null)!;
+        }
+        // TODO: Properties and/or fields
+
+        Error($"Valid member {memberName} does not exist in group {type.FullName}.");
         return null;
     }
 
     internal Func<int, bool>? GetListVisibility(AbstractOptionGroup group, PropertyInfo property)
     {
+        MemberInfo? member = GetVisibilityMember(group, property, out Type type);
+
+        if (member is MethodInfo vMethod)
+        {
+            if (vMethod.ReturnType != typeof(bool))
+            {
+                Error($"Method {memberName} does not return a bool.");
+                return null;
+            }
+            var paramList = vMethod.GetParameters();
+            if (paramList.Length > 1)
+            {
+                Error($"Method {memberName} has too many parameters.");
+                return null;
+            }
+            if (paramList.Length == 0)
+            {
+                return _ => (bool)vMethod.Invoke(group, null)!;
+            }
+
+            if (paramList[0].ParameterType != typeof(int))
+            {
+                Error($"Method {memberName}'s parameter is not an int.");
+                return null;
+            }
+            return i => (bool)vMethod.Invoke(group, [i])!;
+        }
+        // TODO: Properties and/or fields
+
+        Error($"Valid member {memberName} does not exist in group {type.FullName}.");
         return null;
     }
+
+#pragma warning disable S3011 // Reflection should not be used to increase accessibility of classes, methods, or fields
+    private MemberInfo? GetVisibilityMember(AbstractOptionGroup group, PropertyInfo property, out Type type)
+    {
+        type = holderType ?? group.GetType();
+        memberName ??= $"{property.Name}Visible";
+        BindingFlags flags = BindingFlags.Static | BindingFlags.Public;
+        if (holderType == null)
+        {
+            flags |= BindingFlags.Instance | BindingFlags.NonPublic;
+        }
+        return type.GetMember(memberName, flags).FirstOrDefault();
+    }
 #pragma warning restore S3011 // Reflection should not be used to increase accessibility of classes, methods, or fields
 }