add base Generator class, it implements IGenerator

Generate() methods call FillNumbers to get number values.
Numbers are randomized, sized according to limits, unique (no duplicates) and sorted.

Lottery/Generator.cs

@@ -1,56 +1,97 @@
 namespace Lottery
 {
-    /// <summary>
-    /// 
-    /// </summary>
-    class UKGenerator : IGenerator
-    {
-        public int Count { get; } = 6;
+    record Limits(int Count, int Lower, int Upper);
 
-        public List<int> Generate()
+    /// <summary>
+    /// Abstract base class for generators
+    /// It implements the IGenerator interface
+    /// Provides some default implementation
+    /// </summary>
+    class Generator : IGenerator
     { 
-            List<int> numbers = [];
-            for (int i = 0; i < Count; i++)
+        public virtual Numbers Generate() => throw new NotImplementedException();
+
+        protected static void FillNumbers(List<int> NumberList, Limits Limits)
         {
-                numbers.Add(Random.Shared.Next(60));
+            List<int> Candidates = Enumerable.Range(Limits.Lower, Limits.Upper).ToList();
+
+            for (int i = 0; i < Limits.Count; i++)
+            {
+                int RandomIndex = Random.Shared.Next(Candidates.Count);
+                NumberList.Add(Candidates[RandomIndex]);
+                Candidates.RemoveAt(RandomIndex);
             }
-            return numbers;
+            NumberList.Sort();
         }
     }
 
     /// <summary>
-    /// 
+    /// Concrete UKGenerator class.
+    /// Generates six balls from 1 to 59
     /// </summary>
-    class EuroGenerator : IGenerator
+    class UKGenerator : Generator
     {
-        public int Count { get; } = 8;
+        private readonly Limits Limits = new(6, 1, 59);
 
-        public List<int> Generate()
+        public override Numbers Generate()
         {
-            List<int> numbers = [];
-            for (int i = 0; i < Count; i++)
-            {
-                numbers.Add(Random.Shared.Next(60));
-            }
-            return numbers;
+            Numbers Numbers = new(KindOfLotto.Uk, []);
+            Generator.FillNumbers(Numbers.Normal, Limits);
+            return Numbers;
         }
     }
 
     /// <summary>
-    /// 
+    /// Concrete EuroGenerator class.
+    /// Generates five balls from 1 to 50 and two balls from 1 to 12
     /// </summary>
-    class SetForLifeGenerator : IGenerator
+    class EuroGenerator : Generator
     {
-        public int Count { get; } = 10;
+        private readonly Limits NormalLimits = new(5, 1, 50);
+        private readonly Limits SpecialLimits = new(2, 1, 12);
 
-        public List<int> Generate()
+        public override Numbers Generate()
         {
-            List<int> numbers = [];
-            for (int i = 0; i < Count; i++)
-            {
-                numbers.Add(Random.Shared.Next(60));
+            NumbersWithSpecial Numbers = new(KindOfLotto.Euro, [], []);
+            Generator.FillNumbers(Numbers.Normal, NormalLimits);
+            Generator.FillNumbers(Numbers.Special, SpecialLimits);
+            return Numbers;
         }
-            return numbers;
+    }
+
+    /// <summary>
+    /// Concrete SetForLifeGenerator class.
+    /// Generates five balls from 1 to 47 and one ball from 1 to 10
+    /// </summary>
+    class SetForLifeGenerator : Generator
+    {
+        private readonly Limits NormalLimits = new(5, 1, 47);
+        private readonly Limits SpecialLimits = new(1, 1, 10);
+
+        public override Numbers Generate()
+        {
+            NumbersWithSpecial Numbers = new(KindOfLotto.SetForLife, [], []);
+            Generator.FillNumbers(Numbers.Normal, NormalLimits);
+            Generator.FillNumbers(Numbers.Special, SpecialLimits);
+            return Numbers;
+        }
+    }
+
+    /// <summary>
+    /// Concrete ThunderBallGenerator class.
+    /// Generates fives balls from 1 to 39 and one ball from 1 to 14
+    /// </summary>
+    class ThunderBallGenerator : Generator
+    {
+        private readonly Limits NormalLimits = new(5, 1, 39);
+        private readonly Limits SpecialLimits = new(1, 1, 14);
+
+        public override Numbers Generate()
+        {
+            NumbersWithSpecial Numbers = new(KindOfLotto.Thunderball, [], []);
+            Generator.FillNumbers(Numbers.Normal, NormalLimits);
+            Generator.FillNumbers(Numbers.Special, SpecialLimits);
+            return Numbers;
         }
     }
 }