Added Factory pattern

Author: Habrador

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

@@ -4,6 +4,7 @@
 
 namespace Decorator.OrderSystem
 {
+    //Tesla is actually planning to put SpaceX Draco Thrusters on the Roadster to increase the performance so this class is not a lie!
     public class DracoThruster : _CarExtras
     {
         private _Car prevCarPart;

Assets/Patterns/20. Decorator/Tesla order system/decorator-order-system.unity

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Assets/Patterns/21. Factory.meta

@@ -0,0 +1,52 @@
+using System.Collections;
+using System.Collections.Generic;
+using Decorator.OrderSystem;
+using UnityEngine;
+
+namespace Factory.CarFactory
+{
+    public class ChinaFactory : _CarFactory
+    {
+        public override _Car ManufactureCar(CarModels carModel, List<CarExtras> carExtras)
+        {
+            _Car car = null;
+
+            if (carModel == CarModels.ModelS)
+            {
+                car = new ModelS();
+            }
+            else if (carModel == CarModels.Roadster)
+            {
+                car = new Roadster();
+            }
+
+            //Notice that the Cybertruck is missing here, so we cant manufacture it!
+            if (car == null)
+            {
+                Debug.Log("Sorry but this factory cant manufacture this model :(");
+            
+                return car;
+            }
+
+
+            //Add the extras
+            foreach (CarExtras carExtra in carExtras)
+            {
+                if (carExtra == CarExtras.DracoThruster)
+                {
+                    car = new DracoThruster(car, 1);
+                }
+                else if (carExtra == CarExtras.EjectionSeat)
+                {
+                    car = new EjectionSeat(car, 1);
+                }
+                else
+                {
+                    Debug.Log("Sorry but this factory cant add this car extra :(");
+                }
+            }
+
+            return car;
+        }
+    }
+}

Assets/Patterns/21. Factory/Car Factory.meta

@@ -0,0 +1,52 @@
+using System.Collections;
+using System.Collections.Generic;
+using Decorator.OrderSystem;
+using UnityEngine;
+
+namespace Factory.CarFactory
+{
+    public class USFactory : _CarFactory
+    {
+        public override _Car ManufactureCar(CarModels carModel, List<CarExtras> carExtras)
+        {
+            _Car car = null;
+
+            if (carModel == CarModels.Cybertruck)
+            {
+                car = new Cybertruck();
+            }
+            else if (carModel == CarModels.ModelS)
+            {
+                car = new ModelS();
+            }
+            else if (carModel == CarModels.Roadster)
+            {
+                car = new Roadster();
+            }
+
+            if (car == null)
+            {
+                Debug.Log("Sorry but this factory cant manufacture this model :(");
+            
+                return car;
+            }
+
+
+            //Add the extras
+            foreach (CarExtras carExtra in carExtras)
+            {
+                if (carExtra == CarExtras.DracoThruster)
+                {
+                    car = new DracoThruster(car, 1);
+                }
+                //Ejection seats are not legal in US so cant manufacture it (but we will still manufacture the rest of the car)
+                else
+                {
+                    Debug.Log("Sorry but this factory cant add this car extra :(");
+                }
+            }
+
+            return car;
+        }
+    }
+}

Assets/Patterns/21. Factory/Car Factory/Car Factories.meta

@@ -0,0 +1,13 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Decorator.OrderSystem;
+
+namespace Factory.CarFactory
+{
+    public abstract class _CarFactory 
+    {
+        //This method is called the Factory Method 
+        public abstract _Car ManufactureCar(CarModels carModel, List<CarExtras> carExtras);
+    }
+}

Assets/Patterns/21. Factory/Car Factory/Car Factories/ChinaFactory.cs

@@ -0,0 +1,63 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using Factory.CarFactory;
+using Decorator.OrderSystem;
+
+//Example of the Factory Programming Pattern
+//Uses classes from Decorator pattern order system example
+public class CarFactoryController : MonoBehaviour
+{
+    
+    void Start()
+    {
+        //The factories we can choose from
+        _CarFactory US_Factory = new USFactory();
+
+        _CarFactory China_Factory = new ChinaFactory();
+
+
+        //Manufacture cars
+        _Car order1 = US_Factory.ManufactureCar(CarModels.ModelS, new List<CarExtras>() { CarExtras.DracoThruster });
+
+        FinalizeOrder(order1);
+
+
+        _Car order2 = China_Factory.ManufactureCar(CarModels.Cybertruck, new List<CarExtras>() { CarExtras.DracoThruster });
+
+        FinalizeOrder(order2);
+
+
+        _Car order3 = US_Factory.ManufactureCar(CarModels.Roadster, new List<CarExtras>() { CarExtras.DracoThruster, CarExtras.EjectionSeat, CarExtras.DracoThruster });
+
+        FinalizeOrder(order3);
+    }
+
+    
+	
+    private void FinalizeOrder(_Car finishedCar)
+    {
+        if (finishedCar == null)
+        {
+            Debug.Log($"Sorry but we cant manufacture your order, please try again!");
+        }
+        else
+        {
+            Debug.Log($"Your order: {finishedCar.GetDescription()} is ready for delivery as soon as you pay ${finishedCar.Cost()}");
+        }
+    }
+}
+
+
+public enum CarModels
+{
+    ModelS,
+    Roadster,
+    Cybertruck
+}
+
+public enum CarExtras
+{
+    EjectionSeat,
+    DracoThruster
+}