Added decorator pattern

Author: Habrador

Assets/Patterns/20. Decorator.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class Cybertruck : _Car
+    {
+        public Cybertruck()
+        {
+            this.description = "Cybertruck";
+        }
+
+        public override string GetDescription() => this.description;
+
+        public override float Cost() => PriceList.cybertruck;
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class DracoThruster : _CarExtras
+    {
+        private _Car prevCarPart;
+
+
+        public DracoThruster(_Car prevCarPart, int howMany)
+        {
+            this.prevCarPart = prevCarPart;
+            this.howMany = howMany;
+        }
+
+
+        public override string GetDescription() => $"{prevCarPart.GetDescription()}, {howMany} Draco Thruster";
+        
+
+        public override float Cost() => (PriceList.dracoThruster * howMany) + prevCarPart.Cost();
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class EjectionSeat : _CarExtras
+    {
+        private _Car prevCarPart;
+
+
+        public EjectionSeat(_Car prevCarPart, int howMany)
+        {
+            this.prevCarPart = prevCarPart;
+            this.howMany = howMany;
+        }
+
+
+        public override string GetDescription() => $"{prevCarPart.GetDescription()}, {howMany} Ejection Seat";
+        
+
+        public override float Cost() => (PriceList.ejectionSeat * howMany) + prevCarPart.Cost();
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Cybertruck.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    //The class that "decorates" the car class
+    public abstract class _CarExtras : _Car
+    {
+        protected int howMany;
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Cybertruck.cs.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class ModelS : _Car
+    {
+        public ModelS()
+        {
+            this.description = "Model S";
+        }
+
+        public override string GetDescription() => this.description;
+
+        public override float Cost() => PriceList.modelS;
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Extras.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public class Roadster : _Car
+    {
+        public Roadster()
+        {
+            this.description = "Roadster";
+        }
+
+        public override string GetDescription() => this.description;
+
+        public override float Cost() => PriceList.roadster;
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Extras/DracoThrusters.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    //The class we want to add behavior to
+    public abstract class _Car 
+    {
+        protected string description;
+
+        public abstract string GetDescription();
+
+        public abstract float Cost();
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Extras/DracoThrusters.cs.meta

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    //Decorator programming pattern example
+    public class OrderSystemController : MonoBehaviour
+    {
+        private void Start()
+        {
+            //Order 1
+            _Car roadster = new Roadster();
+
+            roadster = new DracoThruster(roadster, 5);
+
+            Debug.Log($"You ordered: {roadster.GetDescription()} and have to pay ${roadster.Cost()}");
+
+            //Order 2
+            _Car cybertruck = new Cybertruck();
+
+            cybertruck = new DracoThruster(cybertruck, 2);
+            cybertruck = new EjectionSeat(cybertruck, 1);
+
+            Debug.Log($"You ordered: {cybertruck.GetDescription()} and have to pay ${cybertruck.Cost()}");
+
+            //Order 3
+            _Car modelS = new ModelS();
+
+            Debug.Log($"You ordered: {modelS.GetDescription()} and have to pay ${modelS.Cost()}");
+
+
+
+            //Some time passes while you wait for your order and Elon Musk finds a cheap way to manufacture the Cybertruck
+            PriceList.cybertruck -= 50f;
+            //But the price of ejections seats goes up
+            PriceList.ejectionSeat += 30f;
+
+            Debug.Log("Price changes!");
+
+            Debug.Log($"You ordered: {roadster.GetDescription()} and have to pay ${roadster.Cost()}");
+            Debug.Log($"You ordered: {cybertruck.GetDescription()} and have to pay ${cybertruck.Cost()}");
+            Debug.Log($"You ordered: {modelS.GetDescription()} and have to pay ${modelS.Cost()}");
+        }
+    }
+}

Assets/Patterns/20. Decorator/Tesla order system/Car parts/Extras/EjectionSeat.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+namespace Decorator.OrderSystem
+{
+    public static class PriceList
+    {
+        //Base models
+        public static float cybertruck = 150f;
+        public static float modelS = 200f;
+        public static float roadster = 350f;
+
+        //Extras
+        public static float dracoThruster = 20f;
+        public static float ejectionSeat = 200f;
+    }
+}