using System;

using System.Collections.Generic;

using System.Text;

namespace FacadeExample

{

    classProgram

    {

        staticvoid Main(string[] args)

        {

            PayFacacde pf = newPayFacacde();

            Console.WriteLine("order:" + pf.CreateOrder("yzhu", 0, 1, 12) + " created");

        }

    }

    classPayFacacde

    {

        privateAccountSystem account = newAccountSystem();

        privateCardSystem card = newCardSystem();

        privatePaySystem pay = newPaySystem();

        publicstring CreateOrder(string userName, int cardID, int cardCount, int areaID)

        {

            int userID = account.GetUserIDByUserName(userName);

           if (userID == 0)

                returnstring.Empty;

            if (!account.UserIsActived(userID, areaID))

                returnstring.Empty;

            if (!card.CardHasStock(cardID, cardCount))

                returnstring.Empty;

            return pay.CreateOrder(userID, cardID, cardCount);

        }

    }

    classAccountSystem

    {

        publicbool UserIsActived(int userID, int areaID)

        {

            returntrue;

        }

        publicint GetUserIDByUserName(string userName)

        {

            return 123;

        }

    }

    classCardSystem

    {

        publicbool CardHasStock(int cardID, int cardCount)

        {

            returntrue;

        }

    }

    classPaySystem

    {

        publicstring CreateOrder(int userID, int cardID, int cardCount)

        {

            return"0000000001";

        }

    }

}