using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.IO;

​

namespace ConsoleApplication13

{

    public class program

    {

        public static Dictionary<string, int> productlist = new Dictionary<string, int>();

        public static void Main(string[] args)

        {   

            const int ext = 5;

            int choice = 0;

            while (choice!=ext)

            {

                Console.Clear();

                DrawLine();

                DisplayTitle();

                DisplayMenu();

                try

                {

                    choice = int.Parse(Console.ReadLine());

                    switch (choice)

                    {

                        case 1:

                            AddNew();break;

                        case 2:

                            View();break;

                        case 3:

                            Delete(); break;

                        case 4:

                            Transact(); break;

                        case 5:

                            {

                                Console.WriteLine("Good Bye! Thank you for transacting with us");

                                System.Threading.Thread.Sleep(500);

                                Environment.Exit(0);

                                break;

                            }

                        default: Console.WriteLine("Choice not in the menu, press key to continue."); break;

                    }

                }

                catch (Exception e)

                {

                    Console.WriteLine(e.Message + " Try again...!");

                }

                    Console.ReadLine();

                }

        }

        public static void DrawLine()

        {

            Console.WriteLine("=============================================");

        }

        public static void DisplayTitle()

        {

            Console.WriteLine("          +++ KD & MJ Shop (POS) +++          ");

            DrawLine();

        }

        public static void DisplayMenu()

        {

            DrawLine();

            Console.WriteLine();

            Console.WriteLine("\t1. Add a Product");

            Console.WriteLine("\t2. View Product List");

            Console.WriteLine("\t3. Delete a Product");

            Console.WriteLine("\t4. Transact Sales");

            Console.WriteLine("\t5. Exit Program");

            Console.WriteLine();

            DrawLine();

            Console.WriteLine("Make your choice type: 1, 2,... or 5 for exit");

            DrawLine();

        }

        public static void AddNew()

        {

            double pP = 0;

            string pN= "";

            Console.Clear();

            Console.WriteLine("= = = = = = < Add New Product > = = = = = =");

        //do

        {

            try

            {

                Console.Write("Product Name: ");

                pN= Console.ReadLine();

                Console.Write("Product Price: ");

                pP= double.Parse(Console.ReadLine());

                if (! productlist.ContainsKey(pN))

                {

                //productlist[pN] = pP;

                Console.WriteLine("! Product added to the system.");

                Console.WriteLine();

                }

                else

                {

                Console.Write("!Product already exist");

                Console.WriteLine("Press any key to continue, [x] to stop");

                Console.WriteLine();

                }

            }

            catch (Exception err)

                {

                    Console.WriteLine("! Product not added. " + err.Message);

                    Console.WriteLine();

                    Console.WriteLine("Press any key to continue, [x] to stop");

                    Console.WriteLine();

                }

            }

            //while(Console.Read(Key)(true).Key != ConsoleKey.X);

        }         

        public static void View() 

        {

            Console.Clear();

            Console.WriteLine("= = = = = = < Product List View > = = = = = ");

            foreach (var kvG in productlist) 

            {

                Console.Write(String.Format("Product name: {0}\n", kvG.Key + "Product price: {0:N}\n", kvG.Value)); 

            }

        }

        public static void Delete()

        {

            Console.Clear();

            Console.WriteLine("= = = = = = < Delete Product > = = = = = =");

        }

        public static void Transact()

        {

            Console.Clear();

            Console.WriteLine("= = = = = = < Transact Sales > = = = = = =");

        }

    }   

}