static Scanner input= new Scanner(System.in);

public static void main(String[] args) {

    System.out.println("      tt@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@n"
                     + "      tt@                                                              @n"
                     + "      tt@                  ★ Saladaty Restaurant ★                     @n"
                     + "      tt@                                                              @n"
                     + "      tt@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@n");

    ArrayList <User> systemUsers=new ArrayList<>();

    //Admins of the system List:
    systemUsers.add(new Admin("@Zahraa_Maher","Z#M1996AN","Zahraa Maher Al-Nemer"));
    systemUsers.add(new Admin("@Malak_Mohammad","memeD1998","Malak Mohammad Darweesh"));
    systemUsers.add(new Admin("@Lamyaa_Mohammad","lammoy998","Malak Mohammad Darweesh"));
    systemUsers.add(new Admin("@Zainab_Abduljalil","ZaiJalil9","Zainab Abduljalil Alrashed"));
    systemUsers.add(new Admin("@Rasha_Mubarak","RereMD123","Rasha Mubarak Al-Dawssary"));
    systemUsers.add(new Admin("@Salhah_Yasin","SalYas321","Salhah Yaseen Al-far"));



    System.out.println(" WELCOME TO SALADATY APPLICATION ");
    System.out.println("------------------------------------------");

    int choice=0;

    while (choice!=4){

        System.out.print(" nchose:"
                      + "n 1- I have membership       (  Sign in  )"
                      + "n 2- I don't have mempership (  Register )"
                      + "n 3- Back to the Home Page"
                      + "nyour choice>> ");
    choice=input.nextInt();
    input.nextLine();

    switch(choice){

        case 1:
            System.out.print("Enter your username: ");
            String username=input.nextLine();
            System.out.print("Enter your password: ");
            String pass=input.nextLine();

            for (int i = 0; i <systemUsers.size(); i++) {

                if ((systemUsers.get(i).getUserName().equals(username))&& (systemUsers.get(i).getPassword().equals(pass))){
                    if (systemUsers.get(i) instanceof Admin){

                        System.out.println("n===========( Welcome Admin )=========== n");

                        // logic of what admin can do
                        //( Admin Menu using while + switch + methods )

                    }


                    else if (systemUsers.get(i) instanceof Customer){

                        System.out.println("n===========( Welcome Customer )=========== n");

                        //logic of what customer can do if he/she has membership
                        //( Customer Menu using while + switch + methods )

                    }

                }
            }



            break;

        case 2:

            //invoking the Regesteration method to make customer membership:
            CustomerRegister(systemUsers);

            break;


        case 3:
            System.out.println("n===========( Back to the Home Page! )=========== n");
            break;


        default:
            System.out.println("Invalid choice");


    }

    }

} // end of main method



// methods to invoke inside main:

//1. CustomerRegister method:
public static void CustomerRegister(ArrayList <User> myUsers){

    int index=6;

        System.out.println("n===========( Customer Membership Registeration )=========== n");
           System.out.println(" [ Entering user information ]");
           System.out.print(" Enter username: ");
           String username=input.next();
           System.out.print(" Enter your password: ");
           String password=input.next();
           System.out.print(" Enter your e-mail: ");
           String email=input.next();
           System.out.print(" Enter your phoneNum: ");
           String phoneNum=input.next();
           input.nextLine();
           System.out.print("n [ Enter your information  ]n");
           System.out.print(" what is your name ? ");
           String namecustomer=input.nextLine();
           System.out.print(" what is your address ? ");
           String address=input.nextLine();
           System.out.print(" what is your credit card number ?");
           String creditNo=input.nextLine();



        myUsers.add(new Customer(namecustomer, address, creditNo,username, password, phoneNum,true, email));

    if (myUsers.get(index) instanceof Customer){

        Customer c= (Customer)myUsers.get(index);

        System.out.println("n** Thank you for registerin dear "+c.getName()+", your username is: "+c.getUserName()+" **");
           index++;

    }
    }


}