using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Builder
{
    using System;
    using System.Collections.Generic;

    namespace DoFactory.GangOfFour.Builder.Structural
    {
        /// <summary>

        /// MainApp startup class for Structural

        /// Builder Design Pattern.

        /// </summary>

        public class MainApp
        {
            /// <summary>

            /// Entry point into console application.

            /// </summary>

            public static void Main()
            {
                // Create director and builders

                Director director = new Director();

                Builder b1 = new ConcreteBuilder1();
                Builder b2 = new ConcreteBuilder2();

                // Construct two products

                director.Construct(b1);
                Product p1 = b1.GetResult();
                p1.Show();

                director.Construct(b2);
                Product p2 = b2.GetResult();
                p2.Show();

                // Wait for user

                Console.ReadKey();
            }
        }

        /// <summary>

        /// The 'Director' class

        /// </summary>

        class Director
        {
            // Builder uses a complex series of steps

            public void Construct(Builder builder)
            {
                builder.BuildPartA();
                builder.BuildPartB();
            }
        }

        /// <summary>

        /// The 'Builder' abstract class

        /// </summary>

        abstract class Builder
        {
            public abstract void BuildPartA();
            public abstract void BuildPartB();
            public abstract Product GetResult();
        }

        /// <summary>

        /// The 'ConcreteBuilder1' class

        /// </summary>

        class ConcreteBuilder1 : Builder
        {
            private Product _product = new Product();

            public override void BuildPartA()
            {
                _product.Add("PartA");
            }

            public override void BuildPartB()
            {
                _product.Add("PartB");
            }

            public override Product GetResult()
            {
                return _product;
            }
        }

        /// <summary>

        /// The 'ConcreteBuilder2' class

        /// </summary>

        class ConcreteBuilder2 : Builder
        {
            private Product _product = new Product();

            public override void BuildPartA()
            {
                _product.Add("PartX");
            }

            public override void BuildPartB()
            {
                _product.Add("PartY");
            }

            public override Product GetResult()
            {
                return _product;
            }
        }

        /// <summary>

        /// The 'Product' class

        /// </summary>

        class Product
        {
            private List<string> _parts = new List<string>();

            public void Add(string part)
            {
                _parts.Add(part);
            }

            public void Show()
            {
                Console.WriteLine("\nProduct Parts -------");
                foreach (string part in _parts)
                    Console.WriteLine(part);
            }
        }
    }
}