import java.util.Scanner;
import java.util.Arrays;

public class GameStore3 {
	public static void main(String[] args) {

		Scanner input = new Scanner(System.in);
		int ids[] = new int[100];
		double sum = 0;
		int nm = 0;
		int index = 0;
		while (true) {
			System.out.print("**********************************************************************"
					+ "\n*                         Welcome to Gaming Center :)                *"
					+ "\n*                         --------------------------                 *"
					+ "\n*     Please enter one of the following options:                     *"
					+ "\n*     1) add ==> this allows you to add a game to inventory          *"
					+ "\n*     2) sell ==> this allows you to sell games to a customer        *"
					+ "\n*     3) exit ==> to end this program                                *"
					+ "\n*                                                                    *"
					+ "\n**********************************************************************\n");
			System.out.print("Enter your option :> ");
			String choice = input.nextLine();
			if (choice.equals("add")) {
				while (true) {
					System.out.print("Please, enter game id (-1 to end): ");
					int id = input.nextInt();
					if (id == -1) {
						break;
					} else {
						ids[(index++)] = id;
					}
				}
			} else if (choice.equals("sell")) {
				if (index <= 0) {
					System.out.print("Sorry. There are no more games in store :(\n");
				}

				else {
					while (true) {
						System.out.print("Please, enter the game id (-1 to end): ");
						int id = input.nextInt();
						if (id == -1) {
							break;
						} else {
							boolean exists = false;
							for (int i = 0; i < ids.length; i++) {
								if (ids[i] == id)
									exists = true;
								ids[i] = 0;
							}
							if (exists) {
								System.out.print("Please, enter the price of next game: \n");
								sum += input.nextDouble();
								nm += 1;
							} else {
								System.out.print("Sorry the id you inserted doesnt exist\n");
							}
						}
					}
						System.out.print("Total price before discount: " + sum + "SR" + "\nYour discount is: "
								+ ((nm <= 2) ? "0.0SR" : sum * 0.2 + "SR") + "\nTotal price after discount: "
								+ ((nm <= 2) ? sum : sum * 0.8 + "SR\n"));


				}
			} else if (choice.equals("exit")) {
				System.out.print("Thanks. Goodbye!");
				break;
			} else {
				System.out.print(choice == "add");
			}

		}
	}
}