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Scripts/Helpers/RNG.cs

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+using System;
+
+public static class RandomHelper
+{
+    // Single Random instance for the whole app
+    private static readonly Random _rand = new Random();
+
+    // Random integer [min, max] inclusive
+    public static int Int(int min, int max)
+    {
+        return _rand.Next(min, max + 1); // max is inclusive
+    }
+
+    // Random float [min, max)
+    public static float Float(float min, float max)
+    {
+        return (float)(_rand.NextDouble() * (max - min) + min);
+    }
+
+    // Random double [min, max)
+    public static double Double(double min, double max)
+    {
+        return _rand.NextDouble() * (max - min) + min;
+    }
+
+    // Random element from an array
+    public static T Choice<T>(T[] array)
+    {
+        if (array == null || array.Length == 0)
+            throw new ArgumentException("Array cannot be null or empty.");
+        return array[_rand.Next(array.Length)];
+    }
+
+    // Random enum value
+    public static T ChoiceEnum<T>() where T : Enum
+    {
+        Array values = Enum.GetValues(typeof(T));   // returns System.Array
+        return (T)values.GetValue(_rand.Next(values.Length)); // use GetValue
+    }
+}