using System;

using System.Text;

​

namespace LmsAct

{

   public class Program

    {

​

        public static string[] items = new string[] { "chicken", "footlong", "Siomai", "siopao" };

        public static double[] prices = new double[] { 57, 20, 10, 24}; 

        public static int[] stocks = new int[] { 100, 100, 100, 100 };

​

        public static bool selectService = true;

        public static double grandtotal = 0;

        private static StringBuilder sb = new StringBuilder();

        public static void Main(string[] args)

        {

            sb.AppendLine();

            sb.AppendLine("-----------------------------------------------------------------");

            sb.AppendLine("------------------------Menu ---------------------------");

            sb.AppendLine("-----------------------------------------------------------------");

            sb.AppendLine();

            sb.AppendLine("Item Description \tQuantity \tPrice \tTotal");

​

​

            Console.WriteLine();

            Console.WriteLine("-----------------------------------------------------------------");

            Console.WriteLine("------------------------ Show Menu ---------------------------");

            Console.WriteLine("-----------------------------------------------------------------");

            selectService = true;

            do

            {

                Console.WriteLine();

                Console.WriteLine("A. Buying\nB. Selling\nC. Adjust Price\nD. Adjust Inventory\nE. Menu\nF. Inventory\nG. Exit");

                Console.Write("\nSelect Service:\t"); 

                string service = Console.ReadLine().ToUpper();

​

                switch (service)

                {

                    case "A":

                        ShowInventory();

                        bool selectBuyCode = true;

                        do

                        {

                            try

                            {

                                Console.Write("Enter code you want to buy stocks:\t"); 

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

​

                                int index = code - 1;

​

                                Console.WriteLine("Stocks on hand:" + stocks[index]);

                                Console.WriteLine();

​

                                Console.Write("Enter stocks you want to buy:\t");

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

​

                                Buying(index, addstocks);

                                selectBuyCode = false;

                            }

                            catch (Exception)

                            {

                                Console.WriteLine("");

                            }

                        } while (selectBuyCode);

                        selectService = true;

                        continue;

                    case "B" :

                        ShowMenu();

                        bool selectSellCode = true;

                        do

                        {

                            try

                            {

                                Console.Write("Enter code you want to purchase:\t");

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

​

                                int index = code - 1;

                                double price = prices[index];

​

                                Console.WriteLine("Available Stocks: " + stocks[index]);

                                Console.WriteLine();

​

                                Console.Write("Enter quantity:\t");

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

​

                                if(quantity <= stocks[index])

                                {

                                    Selling(index, quantity, price);

                                    selectSellCode = false;

                                }

                                else

                                {

                                    Console.WriteLine("Quantity must be less than or equal to the current stocks. Please try again!");

                                }

                            }

                            catch (Exception)

                            {

                                Console.WriteLine("");

                            }

                        } while (selectSellCode);

                        Receipt();

                        selectService = true;

                        continue;

                    case "C":

                        ShowMenu();

                        bool selectPriceCode = true;

                        do

                        {

                            try

                            {

                                Console.Write("Enter code you want to update price:\t");

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

​

                                int index = code - 1;

                                Console.WriteLine("Current Price:" + prices[index]);

                                Console.WriteLine();

                                Console.Write("Enter Your New Price:\t");

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

​

                                AdjustPrice(index, newprice);

                                selectPriceCode = false;

                            }

                            catch (Exception)

                            {

                                Console.WriteLine("");

                            }

                        } while (selectPriceCode);

                        selectService = true;

                        continue;

                    case "D":

                        ShowInventory();

                        bool selectStocksCode = true;

                        do

                        {

                            try

                            {

                                Console.Write("Enter the code that you want to update stocks:\t");

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

​

                                int index = code - 1;

                                Console.WriteLine("Stocks on hand:" + stocks[index]);

                                Console.WriteLine();

​

                                bool selectMethod = true;

                                do

                                {

                                    Console.WriteLine("1. Add Stocks");

                                    Console.WriteLine("2. Remove Stocks");

                                    Console.WriteLine("Select Method (1 or 2 only):\t");

​

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

​

                                    if (method == 1 || method == 2)

                                    {

                                        selectMethod = false;

                                        Console.Write("Enter updated stocks:\t");

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

                                        AdjustInventory(index, method, updatedstocks);

                                        selectStocksCode = false;

                                    }

                                    else

                                    {

                                        Console.WriteLine("");

                                    }

                                } while (selectMethod);

                                ShowInventory();

                            }

                            catch (Exception)

                            {

                                Console.WriteLine("");

                            }

                        } while (selectStocksCode);

                        selectService = true;

                        continue;

                    case "E":

                        selectService = true;

                        ShowMenu();

                        continue;

                    case "F":

                        selectService = true;

                        ShowInventory();

                        continue;

                    case "G":

                        selectService = false;

                        Console.WriteLine("End of the Program");

                        return;

                    default:

                        Console.WriteLine("Invalid request. Please try again!");

                        selectService = true;

                        continue;

                }

​

            } while (selectService);

        }

​

        public static void Receipt()

        {

            Console.WriteLine("Your total is " + grandtotal.ToString("#,##0.00"));

        }

        public static void Selling(int idx, int qty, double price)

        {

            double total = qty * price; 

​

            sb.AppendLine("\t" + items[idx] + "\t\t" + qty + "\t\t" + price.ToString("#,##0.00") + "\t" + total.ToString("#,##0.00"));

​

​

            grandtotal += total;

​

            try

            {

                stocks[idx] = stocks[idx] - qty;

            }

            catch (Exception)

            {

                Console.WriteLine("");

            }

        }

​

        public static void Buying(int index, int addstocks)

        {

            try

            {

                stocks[index] = stocks[index] + addstocks;

                Console.WriteLine("The Stocks has been updated successfully!");

            }

            catch (Exception)

            {

                Console.WriteLine("");

            }

        }

​

        public static void AdjustInventory(int index, int method, int updatedstocks)

        {

            try

            {

                if(method == 1)

                    stocks[index] = stocks[index] + updatedstocks;

                else

                {

                    if (updatedstocks <= stocks[index]) stocks[index] = stocks[index] - updatedstocks;

                    else

                    {

                        Console.WriteLine("Updated stocks must be less than or equal to the current stocks!");

                        return;

                    }

                }

                Console.WriteLine("The Stocks has been updated successfully!");

            }

            catch (Exception)

            {

                Console.WriteLine("");

            }

        }

​

        public static void AdjustPrice(int index, double newprice)

        {

            try

            {

                prices[index] = newprice;

                Console.WriteLine("Your Price has been updated successfully!");

            }

            catch (Exception)

            {

                Console.WriteLine("");

            }

        }

​

        public static void ShowMenu()

        {

            Console.WriteLine("------------------------MENU ------------------------------");

            Console.WriteLine();

            Console.WriteLine("  CODE NAME\t\t FOOD NAME\t\t PRICE");

            Console.WriteLine("-----------------------------------------------------------------");

            for (int i = 0; i < items.Length; i++)

            {

                Console.WriteLine((i+1) + "\t\t\t\t" + (items[i]) + "\t\t\t\t" + (prices[i]));

            }

        }

​

        public static void ShowInventory()

        {

            Console.WriteLine("---------------------- INVETORY ----------------------------");

            Console.WriteLine();

            Console.WriteLine("  Category\t\t NAME\t\t STOCKS ON HAND");

            Console.WriteLine("-----------------------------------------------------------------");

            for (int i = 0; i < items.Length; i++)

            {

                Console.WriteLine((i + 1) + "\t\t\t\t" + (items[i]) + "\t\t\t\t" + (stocks[i]));

            }

        }

    }

}