import java.util.ArrayList;
import java.util.Scanner;

public class StockManagement {
	private static Product[] products;
	private static int maxProducts = 0;
	private static int index = 0;
	private static int selection = 0;

	public static int getMaxNumProducts(Scanner sc) {
		System.out.println("Please enter maximum number of products:");
		maxProducts = sc.nextInt();

		while(maxProducts < 0 ) {
			System.out.println("Please enter maximum number of products:");
			maxProducts = sc.nextInt();
		}
		System.out.println();
		if(maxProducts > 0) {
			products = new Product[maxProducts];
		}
		return maxProducts;
	}

	public static int viewProduct(Product[] p, Scanner sc) {
		int choice;
		for(int i=0;i<maxProducts; i++) {
			System.out.println("Index: "+i+". \n"+products[i].toString());
			System.out.println();
		}

		System.out.print("Please enter the index of product you want to select : ");
		choice = sc.nextInt();
		while(choice < 0 || choice >= maxProducts) {
			System.out.print("Please enter the product you want to select : ");
			choice = sc.nextInt();
		}
		System.out.println();
		return choice;
	}

	public static int displayMenu(Scanner sc) {
		int choice;
		System.out.println("1. View products");
		System.out.println("2. Add stock");
		System.out.println("3. Deduct stock");
		System.out.println("4. Discontinue product");
		System.out.println("0. Exit");
		System.out.println("Please enter a menu option: ");

		choice = sc.nextInt();

		while(choice < 0 || choice >4) {
		System.out.println("Please enter a menu option: ");
			choice = sc.nextInt();
		}
		System.out.println();
		return choice;
	}

	public static void addStock(Product[] p, Scanner sc) {
		int num=-1;
		System.out.println("How many values do you want to add: ");
		num = sc.nextInt();

		while(num < 0) {
			System.out.println("Please enter only positive values!");
			System.out.println("How many values do you want to add: ");
			num = sc.nextInt();
		}
		System.out.println();
		p[selection].addQuantity(num);
	}

	public static void deductStock(Product[] p, Scanner sc) {
		int num=-1;
		System.out.println("How many values do you want to deduct: ");
		num = sc.nextInt();

		while(num < 0 || num > p[selection].getQuantity()) {
			System.out.println("Please enter value greater than equal to 0 and not more than current quantity of stock");
			System.out.println("How many values do you want to deduct: ");
			num = sc.nextInt();
		}
		System.out.println();
		p[selection].deductQuantity(num);
	}

	public static void discontinueProduct(Product[] p, Scanner sc) {
		p[selection].setStatus(false);
	}

	public static void executeMethod(Product[] p, Scanner sc, int choice) {
		switch(choice) {
			case 1:
			selection = viewProduct(p, sc);
			System.out.println("Product selected: "+p[selection].getName());
			break;

			case 2:
			addStock(p, sc);
			break;

			case 3:
			deductStock(p,sc);
			break;

			case 4:
			discontinueProduct(p, sc);
			break;

			default:
			System.out.println("Thank you for visting! Goodbye!");
			break;
		}
	}

	public static void addProduct(Product[] p, Scanner sc) {
		int choice;
		System.out.println("Please select (1 or 2) depending upon product to add: ");
		System.out.println("1. TV");
		System.out.println("2. Refrigerator");
		choice = sc.nextInt();

		while(choice <1 || choice>2) {
			System.out.println("Please select (1 or 2) depending upon product to add: ");
			System.out.println("1. TV");
			System.out.println("2. Refrigerator");
			choice = sc.nextInt();
		}

		switch(choice) {
			case 1:
			addTV(p,sc);
			break;

			case 2:
			addRefrigerator(p, sc);
			break;
		}
	}

	public static void addRefrigerator(Product[] p, Scanner sc) {
		String name, design, color;
		int capacity, quantity, itemNum;
		double price;
		System.out.println();
		System.out.println("Please enter name of refrigerator: ");
		name = sc.next();

		System.out.println("Please enter door design: ");
		design = sc.next();

		System.out.println("Please enter color: ");
		color = sc.next();

		System.out.println("Please enter capacity: ");
		capacity = sc.nextInt();

		System.out.println("Please enter quantity in stock: ");
		quantity = sc.nextInt();

		System.out.println("Please enter price: ");
		price = sc.nextDouble();

		System.out.println("Please enter item number: ");
		itemNum = sc.nextInt();

		p[index] = new Refrigerator(name, design, color, capacity, quantity, price, itemNum);
		index = index + 1;
		System.out.println();
	}

	public static void addTV(Product[] p, Scanner sc) {
		String name, screenType;
		int resolution, displaySize, quantity, itemNum;
		double price;

		System.out.println();
		System.out.println("Please enter name of TV: ");
		name = sc.next();

		System.out.println("Please enter screen type: ");
		screenType = sc.next();

		System.out.println("Please enter resolution: ");
		resolution = sc.nextInt();

		System.out.println("Please enter display size: ");
		displaySize = sc.nextInt();

		System.out.println("Please enter quantity in stock: ");
		quantity = sc.nextInt();

		System.out.println("Please enter price: ");
		price = sc.nextDouble();

		System.out.println("Please enter item number: ");
		itemNum = sc.nextInt();

		p[index] = new TV(name, screenType, resolution, displaySize, quantity, price, itemNum);
		index = index + 1;
		System.out.println();
	}

	public static void displayContent(Product[] p) {
		for(int i=0; i<maxProducts;i++) {
			System.out.println(p[i].toString());
		}
	}

	public static void main(String args[]) {
		String name;
		int choice;

		System.out.println("Please enter your name: ");
		Scanner sc = new Scanner(System.in);

		name = sc.nextLine();

		System.out.println("Welcome "+name+"! Please select menu option: ");
		System.out.println("1. Add product");
		System.out.println("0. Exit");
		choice = sc.nextInt();
		System.out.println();
		switch(choice) {
			case 0:
			System.out.println("Thank you for visting! Goodbye!");
			break;

			case 1:
			maxProducts = getMaxNumProducts(sc);
			for(int i=0; i<maxProducts;i++) {
				addProduct(products, sc);
			}
			break;
		}
		choice = -1;
		System.out.println();
		while(choice!=0){
			choice = displayMenu(sc);
			System.out.println();
			executeMethod(products,sc,choice);
		}
	}
}