using System;

using System.Collections.Generic;

using System.Linq;

​

namespace Test

{

    class Program

    {

      public static void Main(string[] args)

        {

            ProductManager manager = new ProductManager();

​

            int n = Convert.ToInt32(Console.ReadLine());

            for (int i = 0; i < n; i++)

            {

                string productName = Console.ReadLine();

                string category = Console.ReadLine();

                if (category == "Goods")

                {

                    int quantity = Convert.ToInt32(Console.ReadLine());

                    float unitPrice = Convert.ToInt32(Console.ReadLine());

                    int id = manager.AddProduct(productName, category, unitPrice, quantity);

                }

                else

                {

                    float unitPrice = Convert.ToInt32(Console.ReadLine());

                    int id = manager.AddProduct(productName, category, unitPrice);

                }

            }

​

            int choice = Convert.ToInt32(Console.ReadLine());

            // Enter code for handling 4 operations

            switch (choice)

            {

                case 1:

                    string ProductName = Console.ReadLine();

                    string category = Console.ReadLine();

                    if (category == "Goods")

                    {

                        int quantity1 = Convert.ToInt32(Console.ReadLine());

                        float unitPrice1 = Convert.ToInt32(Console.ReadLine());

                        int id = manager.AddProduct(ProductName, category, unitPrice1, quantity1);

​

                        if(id==0)

                        {

                            Console.WriteLine("Product already exists can not add again");

                            break;

                        }

                        else

                        {

                            Console.WriteLine("The product " + ProductName + " has been added with product id " + id);

                        }

                    }

                    else if(category=="Services")

                    {

                        float unitPrice1 = Convert.ToInt32(Console.ReadLine());

                        int id = manager.AddProduct(ProductName, category, unitPrice1);

                        if (id == 0)

                        {

                            Console.WriteLine("Product already exists can not add again");

                            break;

                        }

                        else

                        {

                            Console.WriteLine("The product " + ProductName + " has been added with product id " + id);

                            break;

                        }

                    }

                    else

                    {

                        Console.WriteLine("Wrong category!");

                        break;

​

                    }

                    break;

                case 2:

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

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

                    float unitPrice = Convert.ToInt32(Console.ReadLine());

                    Product pp = manager.UpdateProduct(productid, quantity, unitPrice);

                    Console.WriteLine(pp == null ? "Product does not exist, cannot modify" : "The product " + pp.productName + " has been updated with quantity " + pp.quantity + " and unit price" + pp.unitPrice);

                    break;

​

                case 3:

                    string category2 = Console.ReadLine();

                    if(category2!="Goods" && category2!="Services" )

                    {

                        Console.WriteLine("Wrong category!");

                        break;

​

                    }

                    else

                    {

                        List<Product> prods = manager.ViewProducts(category2);

                        if(category2=="Goods")

                        {

                            Console.WriteLine("Category: Goods,Tax:12%");

                            foreach (Product prod in prods)

                                Console.WriteLine($"{prod.productid}, {prod.productName}: {prod.quantity} left, unit price: {prod.unitPrice}, total price: {prod.totalPrice}");

                        }

                        else

                        {

                            Console.WriteLine("Category: Services, Tax = 10%");

                            foreach (Product prod in prods)

                                Console.WriteLine($"{prod.productid}, {prod.productName}: {prod.quantity} left, unit price: {prod.unitPrice}, total price: {prod.totalPrice}");

​

                        }

​

​

​

                    }

                    break;

                case 4:

                    int goods, services;

                    manager.Statistics(out goods, out services);

                    if (goods != 0 && services != 0)

                    {

                        Console.WriteLine($"Category: Goods, Products: {goods}");

                        Console.WriteLine($"Category: Services, Products: {services}");

                    }

                    else Console.WriteLine("No products found");

                    break;

​

​

                    //break;

            }

​

​

​

        }

    }

​

    // Create class Product as per given specification

    public class Product

    {

        public int productid { get; set; }

        public string productName { get; set; }

        public string category { get; set; }

        public int quantity { get; set; }

        public float unitPrice { get; set; }

        public float tax { get; set; }

        public float totalPrice { get; set; }

​

        public Product(int productid, string productName, string category, int quantity, float unitPrice,float tax,float TotalPrice)

        {

            this.productid = productid;

            this.productName = productName;

            this.category = category;

            this.quantity = quantity;

            this.unitPrice = unitPrice;

            this.tax =category=="Goods" ? 0.12f * unitPrice : 0.10f * unitPrice;

            this.totalPrice = unitPrice + tax;

​

        }

​

        public Product(int productid, string productName, string category, float unitPrice, int quantity)

        {

            this.productid = productid;

            this.productName = productName;

            this.category = category;

            this.unitPrice = unitPrice;

            this.quantity = quantity;

​

​

​

        }

​

​

    }

​

​

​

    // Create class ProductManager as per given specification.

    // Write methods that will perform operations handled in solution1.

​

    public class ProductManager

    {

        List<Product> products { get; set; }

        public int Productid = 100;

​

        public int AddProduct(string productName,string category,float unitPrice,int quantity=0)

        {

            if (products.Exists(x => x.productName == productName))

            {

                return 0;

            }

            else

                products.Add(new Product(++Productid, productName, category, unitPrice, quantity));

            return Productid;

        }

​

      public Product UpdateProduct(int Pid,int qnt,float uPrice)

      {

            Product p = products.Find(c => c.productid == Pid);

            if(p!=null)

            {

                qnt = p.quantity;

                uPrice = p.unitPrice;

            }

            return p;

      }

        public List<Product> ViewProducts(string category)

        {

            List<Product> pp = null;

            pp = products.FindAll(x => x.category == category);

            return pp;

​

        }

​

        public void Statistics(out int goods, out int services)

        {

            goods = products.FindAll(x => x.category == "Goods").Count;

            services = products.FindAll(x => x.category == "Services").Count;

        }

​

    }

}

​