using System;

using System.Collections.Generic;

​

namespace Shape

{

    public interface IMail

    {

        void CreateTemplate(string sender, string receiver);

        string Subject{ set; }

        string Salutation{ set; }

        string Header{ set; }

        string Body{ set; }

        string Greetings{ set; }

        string Footer{ set; }

​

    }   

    public class Core : IMail

    {       

        protected string _sender;

        protected string _receiver;

        protected string _subject;

        protected string _salutation;

        protected string _header;

        protected string _body;

        protected string _greetings;

        protected string _footer;

        public Core()

        {

            _subject = "?";

            _salutation = "Dear ";  

            _body = "... \n";

            _greetings = "Yours";       

        }

        public void CreateTemplate(string sender, string receiver)

        {   

            _sender = sender;

            _receiver = receiver;

            _header = _salutation + receiver + ", \n";

            _footer = _greetings + ", \n" + sender;

            Console.WriteLine("To: {0}", receiver);

            Console.WriteLine("Subject: {0}\n\n", _subject);

            Console.WriteLine(_header);

            Console.WriteLine(_body);

            Console.WriteLine(_footer);

        }

​

        public string Subject

        {

            get { return _subject; }

            set { _subject = value; }

        }

​

        public string Salutation

        {

            get { return _salutation; }

            set { _salutation = value; }

        }

​

        public string Header

        {

            get { return _header; }

            set { _header = value; }

        }

​

        public string Body

        {

            get { return _body; }

            set { _body = value; }

        }

​

        public string Greetings

        {

            get { return _greetings; }

            set { _greetings = value; }

        }

​

        public string Footer

        {

            get { return _footer; }

            set { _footer = value; }

        }

    }

    public class WrapperMail : IMail

    {

        protected IMail wrapee;

​

        public WrapperMail()

        {

            wrapee = new Core();

        }

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

​

        public string Subject

        {

            set { wrapee.Subject = value; }

        }

​

        public string Salutation

        {

            set { wrapee.Salutation = value; }

        }

​

        public string Header

        {

            set { wrapee.Header = value; }

        }

​

        public string Body

        {

            set { wrapee.Body = value; }

        }

​

        public string Greetings

        {

            set { wrapee.Greetings = value; }

        }

​

        public string Footer

        {

            set { wrapee.Footer = value; }

        }

    }

​

    public class Birthday : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "Happy Birthday";

            wrapee.Salutation = "All Goods ";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }   

    public class Christmas : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "Merry Christmas";

            wrapee.Salutation = "Merry Christmas ";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }

​

    public class CloseFriend : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "Dont Know";

            wrapee.Salutation = "Hi ";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }   

​

    public class LoveMail : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "Love";

            wrapee.Salutation = "Dear ";

            wrapee.Body = "I want to go with you to a Date! :D \n";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }   

    public class Formal : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "FormalThing";

            wrapee.Salutation = "Dear Sir/Madam ";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }   

    public class Informal : WrapperMail

    {

        public void CreateTemplate(string sender, string receiver)

        {

            wrapee.Subject = "InformalThing";

            wrapee.Salutation = "Hello ";

            wrapee.CreateTemplate("Muster Mustermann", "Muster Musterfrau");

        }

    }

    public class Programm

    {

        public static void Main()

        {   

            Console.WriteLine("Which mail template do you want to use?");

            Console.WriteLine("1: Birthday");

            Console.WriteLine("2: Christmas");

            Console.WriteLine("3: CloseFriend");

            Console.WriteLine("4: LoveMail");

            Console.WriteLine("5: Formal");

            Console.WriteLine("6: Informal");

            Console.WriteLine();

​

            Console.Write("Enter Number: ");

            string number = Console.ReadLine();

            Console.WriteLine();

​

            switch(number)

            {

                case "1": 

                    Birthday bDMail = new Birthday();

                    bDMail.CreateTemplate("Mustermann", "Musterfrau");

                    break;

                case "2": 

                    Christmas crisMail = new Christmas();

                    crisMail.CreateTemplate("Mustermann", "Musterfrau");

                    break;

                case "3": 

                    CloseFriend clofMail = new CloseFriend();

                    clofMail.CreateTemplate("Mustermann", "Musterfrau");

                    break;

                case "4": 

                    LoveMail loveMail = new LoveMail();

                    loveMail.CreateTemplate("Mustermann", "Musterfrau");

                    break;

                default:

                    Informal Infml = new Informal();

                    Infml.CreateTemplate("Mustermann", "Musterfrau");

                    break;

            }

​

        }

    }

}