using System;

​

namespace PointOfSaleManager

{

    public class Program

    {

        public static bool canExit = false; // Variable allows the application to exit from loop

        public static string inputString = ""; // Variable holds the user inputs

        public static Item[] inventory = new Item[0]; // Variable holds the inventory items

​

        public static void Main(string[] args)

        {

            // Populate sample items

            PopulateSampleInventory();

            // Calling Welcome function to display the welcome message.

            Welcome();

​

            // Using the do-loop to start the function before the check.

            do

            {

                MainMenu(); // Show the Main Menu message

                inputString = Console.ReadLine(); // Read user input

                Console.WriteLine(""); // Give a space line after reading the user input for visual appealing

​

                // Determining the program function based on the user input

                switch (inputString)

                {

                    case "1":

                        MainMenuPlaceOrder();

                        break;

                    case "2":

                        MainMenuUpdateInventory();

                        break;

                    case "3":

                        MainMenuItemInquiry();

                        break;

                    case "4":

                        MainMenuDisplayInventory();

                        break;

                    case "5":

                        MainMenuAboutUs();

                        break;

                    case "0":

                        MainMenuExit();

                        break;

                    default:

                        MainMenuErrorInput();

                        break;

                }

            } while (!canExit);

​

            Environment.Exit(0); // Exit application

        }

​

        public static void PopulateSampleInventory()

        {

            inventory = new[]

            {

                new Item { Id = 1, Name = "Woman Red Shoes Medium", Price = 14.99f, Quantity = 3, Type = "Shoes"},

                new Item { Id = 2, Name = "Woman Red Shoes Large", Price = 16.99f, Quantity = 1, Type = "Shoes"},

                new Item { Id = 3, Name = "Woman Yellow Shoes Small", Price = 13.99f, Quantity = 3, Type = "Shoes"},

                new Item { Id = 4, Name = "Woman Yellow Shoes Medium", Price = 14.99f, Quantity = 2, Type = "Shoes"},

                new Item { Id = 5, Name = "Rolex Watch, Explorer", Price = 3299.59f, Quantity = 21, Type = "Watches"},

                new Item { Id = 6, Name = "Apple Watch II", Price = 142.59f, Quantity = 21, Type = "Watches"},

                new Item { Id = 7, Name = "Apple iPhone 12 Pro MAX", Price = 452.99f, Quantity = 8, Type = "Phones"},

                new Item { Id = 8, Name = "Apple iPhone 12 Pro", Price = 389.99f, Quantity = 16, Type = "Phones"},

                new Item { Id = 9, Name = "Samsung Galaxy S21", Price = 325.00f, Quantity = 16, Type = "Phones"},

            };

        }

​

        public static void Welcome()

        {

            // Assign the welcome message into the string variable

            string welcomeMsg = "";

            welcomeMsg += "========================================================\n";

            welcomeMsg += "==          Welcome to Point of Sale Manager          ==\n";

            welcomeMsg += "========================================================\n";

​

            // Print out the welcome message into the console

            Console.WriteLine(welcomeMsg);

        }

​

        public static void MainMenu()

        {

            // Assign the menu message into string variable

            string menuMsg = "";

            menuMsg += "Please enter one of the option number, following by enter:\n";

            menuMsg += "==========================================================\n";

            menuMsg += "1. Place an Order\n";

            menuMsg += "2. Update inventory\n";

            menuMsg += "3. Item Inquiry\n";

            menuMsg += "4. Display Inventory\n";

            menuMsg += "5. About us\n";

            menuMsg += "0. Exit";

​

            // Print out the menu message into the console

            Console.WriteLine(menuMsg);

            // Print out a message that gave space for writing option

            Console.Write("Option: ");

        }

​

        public static void MainMenuErrorInput()

        {

            string errorMsg = "Error! The input '" + inputString +

                              "' is not part of the menu, please enter a valid option.\n";

            errorMsg += "Press enter key to continue ...\n";

​

            Console.WriteLine(errorMsg);

            Console.ReadLine();

        }

​

        public static void MainMenuPlaceOrder()

        {

            Console.WriteLine("TODO: Placing Order.\n");

        }

​

        public static void MainMenuUpdateInventory()

        {

            Console.WriteLine("TODO: Updating the Inventory.\n");

        }

​

        public static void MainMenuItemInquiry()

        {

            Console.WriteLine("TODO: Inquiring an Item.\n");

        }

​

        public static void MainMenuDisplayInventory()

        {

            string inventoryMsg = "Displaying Inventory:\n\n";

            // Added the table headers

            inventoryMsg += "| ID | Name | Price | Quantity | Type |\n";

            inventoryMsg += "=======================================\n";

​

            for (int x = 0; x < inventory.Length; x++)

            {

                inventoryMsg +="| " +  inventory[x].Id + " | " +  inventory[x].Name + " | " +  inventory[x].Price + " | " +  inventory[x].Quantity + " | " +  inventory[x].Type + " |\n";

            }

​

            Console.WriteLine(inventoryMsg);

        }

​

        public static void MainMenuAboutUs()

        {

            // Generated the art from http://www.network-science.de/ascii/ with font called "rectangles".

            string aboutUsMsg = "==========================================================\n" +

                                "==  _____ _____ _____    _____                          ==\n" +

                                "== |  _  |     |   __|  |     |___ ___ ___ ___ ___ ___  ==\n" +

                                "== |   __|  |  |__   |  | | | | .'|   | .'| . | -_|  _| ==\n" +

                                "== |__|  |_____|_____|  |_|_|_|__,|_|_|__,|_  |___|_|   ==\n" +

                                "==                                        |___|         ==\n" +

                                "==========================================================\n" +

                                "Point of Sale Manager is a software written for school\n" +

                                "final project, all made with love and passion to pass the \n" +

                                "project.\n\n" +

                                "Mission and vision:\n" +

                                "- This project is aimed to enhance the online shopping for \n" +

                                "products using the command line interface, this will allow \n" +

                                "the store manager to manage the inventory and placing order \n" +

                                "directly to the system.\n\n" +

                                "Speciality:\n" +

                                "- This project for what exactly?.\n\n" +

                                "Created by:\n" +

                                "- Mahmood Alqaffas\n\n" +

                                "Press enter key to continue ...";

​

            Console.WriteLine(aboutUsMsg);

            Console.ReadLine();

            Console.WriteLine(""); // Give a space, because why not. More space, more appealing

        }

​

        public static void MainMenuExit()

        {

            // Set the boolean variable to allow exiting the program

            canExit = true;

            string exitGoodbyeMsg = "========================================================\n" +

                                    "==     Thank you for using Point of Sale Manager!     ==\n" +

                                    "========================================================\n" +

                                    "==                       Good bye!                    ==\n" +

                                    "========================================================\n";

​

            Console.WriteLine(exitGoodbyeMsg);

        }

    }

​

    public class Item

    {

        public int Id;

        public string Name;

        public float Price;

        public int Quantity;

        public string Type;

    }

}