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namespace DesignPattern.Facade
{
    class SubsystemA
    {
        public string OperationA1()
        {
            return "Subsystem A, Method A1\n";
        }
        public string OperationA2()
        {
            return "Subsystem A, Method A2\n";
        }
    }

    class SubsystemB
    {
        public string OperationB1()
        {
            return "Subsystem B, Method B1\n";
        }

        public string OperationB2()
        {
            return "Subsystem B, Method B2\n";
        }
    }

    class SubsystemC
    {
        public string OperationC1()
        {
            return "Subsystem C, Method C1\n";
        }

        public string OperationC2()
        {
            return "Subsystem C, Method C2\n";
        }
    }

    public class Facade
    {
        private readonly SubsystemA a = new SubsystemA();
        private readonly SubsystemB b = new SubsystemB();
        private readonly SubsystemC c = new SubsystemC();
        public void Operation1()
        {
            Console.WriteLine("Operation 1\n" +
                a.OperationA1() +
                b.OperationB1() +
                c.OperationC1());
        }
        public void Operation2()
        {
            Console.WriteLine("Operation 2\n" +
                a.OperationA2() +
                b.OperationB2() +
                c.OperationC2());
        }
    }
}

namespace DesignPattern.Facade.Sample
{
    // The 'Subsystem ClassA' class
    class CarModel
    {
        public void SetModel()
        {
            Console.WriteLine(" CarModel - SetModel");
        }
    }

    /// <summary>
    /// The 'Subsystem ClassB' class
    /// </summary>
    class CarEngine
    {
        public void SetEngine()
        {
            Console.WriteLine(" CarEngine - SetEngine");
        }
    }

    // The 'Subsystem ClassC' class
    class CarBody
    {
        public void SetBody()
        {
            Console.WriteLine(" CarBody - SetBody");
        }
    }

    // The 'Subsystem ClassD' class
    class CarAccessories
    {
        public void SetAccessories()
        {
            Console.WriteLine(" CarAccessories - SetAccessories");
        }
    }

    // The 'Facade' class
    public class CarFacade
    {
        private readonly CarAccessories accessories;
        private readonly CarBody body;
        private readonly CarEngine engine;
        private readonly CarModel model;

        public CarFacade()
        {
            accessories = new CarAccessories();
            body = new CarBody();
            engine = new CarEngine();
            model = new CarModel();
        }

        public void CreateCompleteCar()
        {
            Console.WriteLine("******** Creating a Car **********");
            model.SetModel();
            engine.SetEngine();
            body.SetBody();
            accessories.SetAccessories();

            Console.WriteLine("******** Car creation is completed. **********");
        }
    }

    // Facade pattern demo
    class Program
    {
        static void Main(string[] args)
        {
            var facade = new CarFacade();

            facade.CreateCompleteCar();

            Console.ReadKey();
        }
    }
}