Implement ConstHelper

AyCode.Core/Helpers/ConstHelper.cs

@@ -0,0 +1,47 @@
+using System.Reflection;
+
+namespace AyCode.Core.Helpers;
+
+public sealed class ConstHelper
+{
+    private static readonly Dictionary<string, Dictionary<int, string>?> ObjectsByNamesByValue = new();
+
+    public static string NameByValue<T>(int value) where T : class
+        => GetNameByValue(GetNamesByType(typeof(T).Name) ?? FillNames<T>(), value);
+
+    public static string NameByValue(string typeName, int value)
+        => GetNameByValue(GetNamesByType(typeName), value);
+
+
+    private static string GetNameByValue(IReadOnlyDictionary<int, string>? namesByValue, int value)
+        => namesByValue != null && namesByValue.TryGetValue(value, out var fieldName) ? $"[{fieldName}:{value}]" : $"...:{value}]";
+
+    private static Dictionary<int, string>? GetNamesByType(string typeName)
+    {
+        lock (ObjectsByNamesByValue)
+        {
+            if (ObjectsByNamesByValue.TryGetValue(typeName, out var namesByValue) && namesByValue!.Count > 0)
+                return namesByValue;
+        }
+
+        return null;
+    }
+
+    private static Dictionary<int, string> FillNames<T>() where T : class
+    {
+        var objectType = typeof(T);
+        var namesByValue = new Dictionary<int, string>();
+
+        lock (ObjectsByNamesByValue)
+        {
+            foreach (var fld in objectType.GetFields().Where(x => (x.Attributes & FieldAttributes.Literal) != 0 && x.FieldType == typeof(int)))
+            {
+                namesByValue[(int)fld.GetValue(null)!] = fld.Name;
+            }
+
+            ObjectsByNamesByValue[objectType.Name] = namesByValue;
+        }
+
+        return namesByValue;
+    }
+}