implement

dotnet/AipsCore/Domain/Models/Whiteboard/ValueObjects/WhiteboardCode.cs

@@ -1,6 +1,7 @@
 using AipsCore.Domain.Abstract.Rule;
 using AipsCore.Domain.Abstract.ValueObject;
 using AipsCore.Domain.Common.Validation.Rules;
+using AipsCore.Domain.Models.Whiteboard.External;
 using AipsCore.Domain.Models.Whiteboard.Validation;
 
 namespace AipsCore.Domain.Models.Whiteboard.ValueObjects;
@@ -25,4 +26,32 @@ public record WhiteboardCode : AbstractValueObject
             new WhiteboardCodeCharsetRule(CodeValue)
         ];
     }
+
+    public async static Task<WhiteboardCode> GenerateUniqueAsync(IWhiteboardRepository whiteboardRepository)
+    {
+        WhiteboardCode whiteboardCode;
+        bool codeExists;
+
+        do
+        {
+            whiteboardCode = Generate();
+
+            codeExists = await whiteboardRepository.WhiteboardCodeExists(whiteboardCode);
+        } while (codeExists);
+
+        return whiteboardCode;
+    }
+
+    public static WhiteboardCode Generate()
+    {
+        var rng = new Random();
+        char[] result = new char[8];
+
+        for (int i = 0; i < result.Length; i++)
+        {
+            result[i] = (char)('0' + rng.Next(0, 10));
+        }
+        
+        return new WhiteboardCode(new string(result));
+    }
 }