using System;

namespace AbstractFactoryPattern {

  //  Abstract Factory        D-J Miller and Judith Bishop Sept 2007

  //  Uses generics to simplify the creation of factories

 

  interface IFactory<Brand>

    where Brand : IBrand {

    IBag CreateBag();

    IShoes CreateShoes();

  }

  // Conctete Factories (both in the same one)

  class Factory<Brand> : IFactory<Brand>

    where Brand : IBrand, new() {

    public IBag CreateBag() {

      return new Bag<Brand>();

    }

    public IShoes CreateShoes() {

      return new Shoes<Brand>();

    }

  }

  // Product 1

  interface IBag {

    string Material { get; }

  }

  // Product 2

  interface IShoes {

    int Price { get; }

  }

  // Concrete Product 1

  class Bag<Brand> : IBag

    where Brand : IBrand, new() {

    private Brand myBrand;

    public Bag() {

      myBrand = new Brand();

    }

    public string Material { get { return myBrand.Material; } }

  }

  // Concrete Product 2

  class Shoes<Brand> : IShoes

    where Brand : IBrand, new() {

      

    private Brand myBrand;

      

    public Shoes() {

      myBrand = new Brand();

    }

    public int Price { get { return myBrand.Price; } }

  }

  interface IBrand {

    int Price { get; }

    string Material { get; }

  }

  class Gucci : IBrand {

    public int Price { get { return 1000; } }

    public string Material { get { return "Crocodile skin"; } }

  }

  class Poochy : IBrand {

    public int Price { get { return new Gucci().Price / 3; } }

    public string Material { get { return "Plastic"; } }

  }

  class Groundcover : IBrand {

    public int Price { get { return 2000; } }

    public string Material { get { return "South african leather"; } }

  }

  class Client<Brand>

    where Brand : IBrand, new() {

    public void ClientMain() { //IFactory<Brand> factory)

      IFactory<Brand> factory = new Factory<Brand>();

      IBag bag = factory.CreateBag();

      IShoes shoes = factory.CreateShoes();

      Console.WriteLine("I bought a Bag which is made from " + bag.Material);

      Console.WriteLine("I bought some shoes which cost " + shoes.Price);

    }

  }

  static class Program {

    static void Main() {

      // Call Client twice

      new Client<Poochy>().ClientMain();

      new Client<Gucci>().ClientMain();

      new Client<Groundcover>().ClientMain();

    }

  }

}

/* Output

I bought a Bag which is made from Plastic

I bought some shoes which cost 333

I bought a Bag which is made from Crocodile skin

I bought some shoes which cost 1000

I bought a Bag which is made from South african leather

I bought some shoes which cost 2000

*/