import java.util.*;
public class LoginPrototype {

    static Scanner kbd = new Scanner(System.in);
    static Credentials user;
    static ArrayList<Credentials> allUsers = new ArrayList<Credentials>();

    public static void main(String[] args) {


        displayMenu();



    }


    public static void displayMenu(){

        int choice;

            do{
        System.out.println("Main menu");
        System.out.println("[1]Login");
        System.out.println("[2]Register");
        System.out.println("[0]Exit");

        System.out.print("Please select: ");
        choice = kbd.nextInt();

        switch(choice){

        case 1: System.out.println("Loging in"); handleLogin();allList();break;
        case 2: System.out.println("Registering");register();allList(); break;
        case 0: System.out.println("Closing app"); break;
        default : System.out.println("Wrong number");
        }
            }while(choice !=0);

    }

    public static Credentials handleCredentialInput(){

        String username;
        String password;

        System.out.print("Please enter username");
        username= kbd.next();
        System.out.print("Please enter password");
        password=kbd.next();

        user= new Credentials(username,password);

        return user;



    }


private static  void register(){


    Credentials  c=handleCredentialInput();

    boolean doNotExist=false;
     for (int i=0; i< allUsers.size() ;i++)
     {

         if(c.equals(allUsers.get(i)))
        {

        System.out.println();
        System.out.println("User already exist");
        doNotExist =true;

        }


        }
     if(!doNotExist)
        {


        System.out.println("Added");
        allUsers.add(c);

        }


}
private static void allList(){
    for(Credentials c : allUsers)
    {
        System.out.println(c.getUsername());
    }

}

private static void handleLogin(){

    Credentials c = handleCredentialInput();
    if(allUsers.contains(c))
    {
        Credentials c1= allUsers.get(allUsers.indexOf(c));

        if(c1.getPassword().equals(c.getPassword()))
        {
            System.out.println("Correct password");
        }
        else
            System.out.println("wrong password");
    }


}


}