remove the Generator hierarchy and the IGenerator interface

remove the Numbers class.

Limits are now passed to the constructor of each Lottery class.

{Generator}.Generate is now a static method.

Spin button renamed to Play button

Lottery/Generator.cs

@@ -1,101 +1,19 @@
 namespace Lottery
 {
-    record Limits(int Count, int Lower, int Upper);
+    internal class Generator
-
-    /// <summary>
-    /// Abstract base class for generators
-    /// All subclasses must implement the IGenerator interface
-    /// Provides some default implementation
-    /// </summary>
-    class Generator : IGenerator
     {
-        public virtual Numbers Generate() => throw new NotImplementedException();
+        public static List<int> Generate(Limits Limits)
-
-        protected static void FillNumbers(List<int> NumberList, Limits Limits)
         {
             List<int> Candidates = Enumerable.Range(Limits.Lower, Limits.Upper).ToList();
+            List<int> Numbers = [];
 
             for (int i = 0; i < Limits.Count; i++)
             {
                 int RandomIndex = Random.Shared.Next(Candidates.Count);
-                NumberList.Add(Candidates[RandomIndex]);
+                Numbers.Add(Candidates[RandomIndex]);
                 Candidates.RemoveAt(RandomIndex);
             }
-            NumberList.Sort();
+            Numbers.Sort();
-        }
-
-        protected static void FillNumbers(
-            List<int> NormalList, Limits NormalLimits, 
-            List<int> SpecialList, Limits SpecialLimits)
-        {
-            FillNumbers(NormalList, NormalLimits);
-            FillNumbers(SpecialList, SpecialLimits);
-        }
-    }
-
-    /// <summary>
-    /// Concrete UKLottoGenerator class.
-    /// Generates six balls from 1 to 59
-    /// </summary>
-    class UKLottoGenerator : Generator
-    {
-        private readonly Limits Limits = new(6, 1, 59);
-
-        public override Numbers Generate()
-        {
-            Numbers Numbers = new([]);
-            Generator.FillNumbers(Numbers.Normal, Limits);
-            return Numbers;
-        }
-    }
-
-    /// <summary>
-    /// Concrete EuroMillionsGenerator class.
-    /// Generates five balls from 1 to 50 and two balls from 1 to 12
-    /// </summary>
-    class EuroMillionsGenerator : Generator
-    {
-        private readonly Limits NormalLimits = new(5, 1, 50);
-        private readonly Limits SpecialLimits = new(2, 1, 12);
-
-        public override Numbers Generate()
-        {
-            NumbersWithSpecial Numbers = new([], []);
-            Generator.FillNumbers(Numbers.Normal, NormalLimits, Numbers.Special, SpecialLimits);
-            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([], []);
-            Generator.FillNumbers(Numbers.Normal, NormalLimits, 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([], []);
-            Generator.FillNumbers(Numbers.Normal, NormalLimits, Numbers.Special, SpecialLimits);
             return Numbers;
         }
     }

Lottery/IGenerator.cs

@@ -1,10 +0,0 @@
-namespace Lottery
-{
-    /// <summary>
-    /// All Generators must implement the Generate method
-    /// </summary>
-    interface IGenerator
-    {
-        Numbers Generate();
-    }
-}

Lottery/Lottery.cs

@@ -1,53 +1,36 @@
 namespace Lottery
 {
-    /// <summary>
+    internal class Lottery(Limits limits)
-    /// Base Lottery class, use it for lotteries that generate a single set of numbers.
-    /// SpecialIdentifier may be overridden for Lotteries with Special values.
-    /// </summary>
-    /// <param name="Generator">A fully formed Generator</param>
-    internal class Lottery(IGenerator Generator)
     {
-        protected Numbers GenerateNumbers() => Generator.Generate();
+        protected Limits Limits => limits;
-
+        public virtual string Play() => $"Numbers: {string.Join(", ", Generator.Generate(Limits))}";
-        public virtual string Output()
-        {
-            var numbers = GenerateNumbers();
-            return $"Numbers: {string.Join(", ", numbers.Normal)}";
-        }
     }
 
-    /// <summary>
+    internal class LotteryWithSpecial(Limits limits, Limits specialLimits) : Lottery(limits)
-    /// Abstract base class, for lotteries with special values.
-    /// It subclasses Lottery.
-    /// </summary>
-    /// <param name="Generator">A fully formed Generator</param>
-    internal class LotteryWithSpecial(IGenerator Generator) : Lottery(Generator)
     {
+        protected Limits SpecialLimits => specialLimits;
         protected virtual string SpecialIdentifier => throw new NotImplementedException();
 
-        public override string Output()
+        public override string Play()
         {
-            var numbers = GenerateNumbers() as NumbersWithSpecial
-                ?? throw new LotteryException($"Unable to generate numbers for {this}");
-
             return string.Join("\t", [
-                $"Numbers: {string.Join(", ", numbers.Normal)}",
+                $"Numbers: {string.Join(", ", Generator.Generate(Limits))}",
-                $"{SpecialIdentifier}: {string.Join(", ", numbers.Special)}",
+                $"{SpecialIdentifier}: {string.Join(", ", Generator.Generate(SpecialLimits))}",
             ]);
         }
     }
 
-    internal class EuroMillionsLotteryWithSpecial(IGenerator Generator) : LotteryWithSpecial(Generator)
+    internal class EuroMillionsLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
     {
         protected override string SpecialIdentifier => "Lucky Stars";
     }
 
-    internal class SetForLifeLotteryWithSpecial(IGenerator Generator) : LotteryWithSpecial(Generator)
+    internal class SetForLifeLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
     {
         protected override string SpecialIdentifier => "Life Ball";
     }
 
-    internal class ThunderballLotteryWithSpecial(IGenerator Generator) : LotteryWithSpecial(Generator)
+    internal class ThunderballLottery(Limits limits, Limits specialLimits) : LotteryWithSpecial(limits, specialLimits)
     {
         protected override string SpecialIdentifier => "Thunderball";
     }

Lottery/MainPage.xaml

@@ -9,9 +9,9 @@
             Spacing="25">
             <Picker x:Name="LotteryPicker" Title="Pick your lottery" SelectedIndexChanged="LotteryPicker_SelectedIndexChanged" />
 
-            <Label x:Name="NumbersLabel" Text="Click Spin button to generate" HorizontalOptions="Center" FontSize="Medium"  />
+            <Label x:Name="NumbersLabel" Text="Click Play button to generate numbers" HorizontalOptions="Center" FontSize="Medium"  />
 
-            <Button x:Name="SpinButton" Text="Spin" Clicked="SpinButton_Clicked"/>
+            <Button x:Name="PlayButton" Text="Play" Clicked="PlayButton_Clicked"/>
         </VerticalStackLayout>
     </ScrollView>
 

Lottery/MainPage.xaml.cs

@@ -1,12 +1,14 @@
 namespace Lottery
 {
+    internal record Limits(int Count, int Lower, int Upper);
+
     public partial class MainPage : ContentPage
     {
         readonly List<Lottery> Lotteries = [
-            new Lottery(new UKLottoGenerator()), 
+            new Lottery(limits: new Limits(6, 1, 59)), 
-            new EuroMillionsLotteryWithSpecial(new EuroMillionsGenerator()), 
+            new EuroMillionsLottery(limits: new Limits(5, 1, 50), specialLimits: new Limits(2, 1, 12)), 
-            new SetForLifeLotteryWithSpecial(new SetForLifeGenerator()), 
+            new SetForLifeLottery(limits: new Limits(5, 1, 47), specialLimits: new Limits(1, 1, 10)), 
-            new ThunderballLotteryWithSpecial(new ThunderBallGenerator())
+            new ThunderballLottery(limits: new Limits(5, 1, 39), specialLimits: new Limits(1, 1, 14))
         ];
         const KindOfLottery DefaultLottery = KindOfLottery.Uk;
         Lottery Lottery;
@@ -22,9 +24,9 @@
             Lottery = Lotteries[LotteryPicker.SelectedIndex];
         }
 
-        private void SpinButton_Clicked(object sender, EventArgs e)
+        private void PlayButton_Clicked(object sender, EventArgs e)
         {
-            NumbersLabel.Text = Lottery.Output();
+            NumbersLabel.Text = Lottery.Play();
             SemanticScreenReader.Announce(NumbersLabel.Text);
         }
 

Lottery/Numbers.cs

@@ -1,6 +0,0 @@
-namespace Lottery
-{
-    internal record Numbers(List<int> Normal);
-
-    internal record NumbersWithSpecial(List<int> Normal, List<int> Special) : Numbers(Normal);
-}