using System;

public class Program

{

    public static void Main()

    {

        //InterfacesIntro();

        //Demo();

        ICustomerDal[] customerDals = new ICustomerDal[3]

        {

            new SqlServerCustomerDal(), 

            new OracleCustomerDal(),

            new MySqlCustomerDal()

        };

        foreach (var customerDal in customerDals)

        {

            customerDal.Add();  

        }

    }

    private static void Demo()

    {

        CustomerMenager customer = new CustomerMenager();

        customer.Add(new OracleCustomerDal());

        customer.Add(new SqlServerCustomerDal());

    }

    interface ICustomerDal

    {

        void Add();

        void Update();

        void Delete();

    }

    class SqlServerCustomerDal : ICustomerDal

    {

        public void Add()   {Console.WriteLine("Sql Added!");}

        public void Update()   {Console.WriteLine("Sql Updated!");}

        public void Delete()   {Console.WriteLine("Sql Deleted!");}

    }

    class OracleCustomerDal : ICustomerDal

    {

        public void Add()   {Console.WriteLine("Oracle Added!");}

        public void Update()   {Console.WriteLine("Oracle Updated!");}

        public void Delete()   {Console.WriteLine("Oracle Deleted!");}

    }

    class MySqlCustomerDal : ICustomerDal

    {

        public void Add()   {Console.WriteLine("MySql Added!");}

        public void Update()   {Console.WriteLine("MySql Updated!");}

        public void Delete()   {Console.WriteLine("MySql Deleted!");}

    }

    class CustomerMenager

    {

        public void Add(ICustomerDal customerDal) {customerDal.Add();}

    }

    interface IPerson

    {

        int Id {get ; set;}

        string FirstName {get ; set;}

        string LastName {get ; set;}

    }

    class Customer : IPerson

    {

        public int Id {get ; set;}

        public string FirstName {get ; set;}

        public string LastName {get ; set;}

        public string Adress {get ; set;}

    }

    class Student : IPerson

    {

        public int Id {get ; set;}

        public string FirstName {get ; set;}

        public string LastName {get ; set;}

        public string Department {get ; set;}

    }

    class PersonMenager

    {

        public void Add(IPerson person) {Console.WriteLine(person.FirstName);}  //Person olarak tanımlandığından çağırıldığında customer ya da student olması fark etmez ve yeni bir kategori eklendiğinde ekstra bir tanımlama ve değişikliğe gerek kalmaz.

    }

    private static void InterfacesIntro() 

    {

    PersonMenager menager = new PersonMenager();

        Customer customer = new Customer

        {

        Id = 1, FirstName = "Furkan", LastName = "Yıldırım", Adress = "Istanbul"

        };

        Student student = new Student

        {

        Id = 2, FirstName = "Ahmet", LastName = "Deli", Department = "Engineering"

        };

        menager.Add(customer);

        menager.Add(student);

    }

}