Make the movies results random once the cache expires #2837

src/Ombi.Helpers/LinqHelpers.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 
 namespace Ombi.Helpers
 {
@@ -21,5 +22,31 @@ namespace Ombi.Helpers
         {
             return new HashSet<T>(source, comparer);
         }
+
+        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source)
+        {
+            return source.Shuffle(new Random());
+        }
+
+        public static IEnumerable<T> Shuffle<T>(this IEnumerable<T> source, Random rng)
+        {
+            if (source == null) throw new ArgumentNullException(nameof(source));
+            if (rng == null) throw new ArgumentNullException(nameof(rng));
+
+            return source.ShuffleIterator(rng);
+        }
+
+        private static IEnumerable<T> ShuffleIterator<T>(
+            this IEnumerable<T> source, Random rng)
+        {
+            var buffer = source.ToList();
+            for (int i = 0; i < buffer.Count; i++)
+            {
+                int j = rng.Next(i, buffer.Count);
+                yield return buffer[j];
+
+                buffer[j] = buffer[i];
+            }
+        }
     }
 }