Add Decorator Pattern

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/Character.cs

@@ -0,0 +1,28 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public class Character : ICharacter
+{
+    private readonly string _name;
+    private readonly IReadOnlyList<string> _magicSpells;
+
+    public Character(string name)
+    {
+        _name = name;
+        _magicSpells = new[] { "Light" };
+    }
+
+    public string GetName()
+    {
+        return _name;
+    }
+
+    public string GetClass()
+    {
+        return string.Empty;
+    }
+
+    public IReadOnlyList<string> GetMagicSpells()
+    {
+        return _magicSpells;
+    }
+}

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/Cleric.cs

@@ -0,0 +1,31 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public class Cleric : IClassDecorator
+{
+    private readonly ICharacter _character;
+
+    private readonly IReadOnlyList<string> _magicSpells;
+
+    public Cleric(ICharacter character)
+    {
+        _character = character;
+        _magicSpells = new[] { "Bless", "Guiding Bolt" };
+    }
+
+    public string GetName()
+    {
+        return _character.GetName();
+    }
+
+    public string GetClass()
+    {
+        return $"Cleric, {_character.GetClass()}";
+    }
+
+    public IReadOnlyList<string> GetMagicSpells()
+    {
+        return _character.GetMagicSpells()
+            .Concat(_magicSpells)
+            .ToList();
+    }
+}

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/ICharacter.cs

@@ -0,0 +1,8 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public interface ICharacter
+{
+    string GetName();
+    string GetClass();
+    IReadOnlyList<string> GetMagicSpells();
+}

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/IClassDecorator.cs

@@ -0,0 +1,6 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public interface IClassDecorator : ICharacter
+{
+
+}

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/Paladin.cs

@@ -0,0 +1,31 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public class Paladin : IClassDecorator
+{
+    private readonly ICharacter _character;
+
+    private readonly IReadOnlyList<string> _magicSpells;
+
+    public Paladin(ICharacter character)
+    {
+        _character = character;
+        _magicSpells = new[] { "Command", "CloudKill" };
+    }
+
+    public string GetName()
+    {
+        return _character.GetName();
+    }
+
+    public string GetClass()
+    {
+        return $"Paladin, {_character.GetClass()}";
+    }
+
+    public IReadOnlyList<string> GetMagicSpells()
+    {
+        return _character.GetMagicSpells()
+            .Concat(_magicSpells)
+            .ToList();
+    }
+}

MadWorld/MadWorld.Frontend.Application/DesignPatterns/DecoratorPattern/Wizard.cs

@@ -0,0 +1,31 @@
+namespace MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+public class Wizard : IClassDecorator
+{
+    private readonly ICharacter _character;
+
+    private readonly IReadOnlyList<string> _magicSpells;
+
+    public Wizard(ICharacter character)
+    {
+        _character = character;
+        _magicSpells = new[] { "CounterSpell", "Fireball" };
+    }
+
+    public string GetName()
+    {
+        return _character.GetName();
+    }
+
+    public string GetClass()
+    {
+        return $"Wizard, {_character.GetClass()}";
+    }
+
+    public IReadOnlyList<string> GetMagicSpells()
+    {
+        return _character.GetMagicSpells()
+            .Concat(_magicSpells)
+            .ToList();
+    }
+}

MadWorld/MadWorld.Frontend.UI.Suite/Pages/Learn/DesignPatterns/DecoratorPattern/DecoratorPattern.razor

@@ -0,0 +1,42 @@
+@page "/Learn/DesignPatterns/DecoratorPattern"
+
+@if (_character.IsSome)
+{
+    <div class="row">
+        <div class="col-4">
+            <div class="card" style="width: 30rem;">
+                <div class="card-body">
+                    <h5 class="card-title">@Character.GetName()</h5>
+                    <p class="card-text">Class: @Character.GetClass()</p>
+                    <p class="card-text">Magic Spells: @string.Join(",", Character.GetMagicSpells())</p>
+                    <button class="btn btn-danger" @onclick="() => Reset()">Reset @Character.GetName()</button>
+                </div>
+            </div>
+        </div>
+    </div>
+    <div class="row">
+        <div class="col-2">
+            <button class="btn btn-success" @onclick="AddCleric">Add Cleric</button>
+        </div>
+        <div class="col-2">
+            <button class="btn btn-warning" @onclick="AddPaladin">Add Paladin</button>
+        </div>
+        <div class="col-2">
+            <button class="btn btn-danger" @onclick="AddWizard">Add Wizard</button>
+        </div>
+    </div>
+}
+else
+{
+    <RadzenTemplateForm Data="@_name" Submit="(string name) => CreateCharacter(name)">
+        <RadzenColumn Size="12" SizeMD="4">
+            <RadzenLabel Text="Character name" />
+        </RadzenColumn>
+        <RadzenColumn Size="12" SizeMD="8">
+            <RadzenTextBox @bind-Value="_name" class="col-width-100"></RadzenTextBox>
+        </RadzenColumn>
+        <RadzenStack Orientation="Orientation.Horizontal" JustifyContent="JustifyContent.Center" Gap="1rem" Class="rz-mt-8 rz-mb-4">
+            <RadzenButton ButtonType="ButtonType.Submit" Size="ButtonSize.Large" Icon="save" Text="Save" />
+        </RadzenStack>
+    </RadzenTemplateForm>
+}

MadWorld/MadWorld.Frontend.UI.Suite/Pages/Learn/DesignPatterns/DecoratorPattern/DecoratorPattern.razor.cs

@@ -0,0 +1,37 @@
+using LanguageExt;
+using MadWorld.Frontend.Application.DesignPatterns.DecoratorPattern;
+
+namespace MadWorld.Frontend.UI.Suite.Pages.Learn.DesignPatterns.DecoratorPattern;
+
+public partial class DecoratorPattern
+{
+    private Option<ICharacter> _character = Option<ICharacter>.None;
+    private ICharacter Character => _character.FirstOrDefault()!;
+
+    private string _name = string.Empty;
+
+    private void CreateCharacter(string name)
+    {
+        _character = new Character(name);
+    }
+
+    private void AddCleric()
+    {
+        _character = new Cleric(Character);
+    }
+
+    private void AddPaladin()
+    {
+        _character = new Paladin(Character);
+    }
+
+    private void AddWizard()
+    {
+        _character = new Wizard(Character);
+    }
+
+    private void Reset()
+    {
+        _character  = Option<ICharacter>.None;
+    }
+}

MadWorld/MadWorld.Frontend.UI.Suite/Pages/Learn/DesignPatterns/DesignPatterns.razor

@@ -1,3 +1,12 @@
 @page "/Learn/DesignPatterns"
 
-<a href="/Learn/DesignPatterns/ObserverPattern" class="btn btn-primary">Observer Patterns</a>
+<div class="container">
+    <div class="row">
+        <div class="col">
+            <a href="/Learn/DesignPatterns/ObserverPattern" class="btn btn-primary">Observer Pattern</a>
+        </div>
+        <div class="col">
+            <a href="/Learn/DesignPatterns/DecoratorPattern" class="btn btn-primary">Decorator Pattern</a>
+        </div>
+    </div>
+</div>