import javax.swing.JOptionPane;
import java.io.*;
import java.util.*;
public class user
{
    public static ArrayList<ArrayList<String>>  users;
    public static void main(String[] args) throws IOException
    {
        String[] details = usernameValidation();
        if(details[0]!= "") //Empty string is assigned to the first index if the username
        {                   //and password are invalid in usernameValidation method
            String username = details[0];
            int userScore = Integer.valueOf(details[1]); //Gave the details simple variable names for ease of use
        }
    }
    public static String[] usernameValidation() throws IOException
    {
        boolean validInput = false;
        int chances = 3;
        String username = new String();
        String password = new String();
        String userScore = new String();

        File inputFile = new File("users.txt");
        users = new ArrayList<ArrayList<String>>();
        users.add(new ArrayList<String>());
        users.add(new ArrayList<String>());
        users.add(new ArrayList<String>()); //set up my array list for the user details

        String fileElements[];

        Scanner in = new Scanner(inputFile); //makes connection between scanner object and the file

        while(in.hasNext()) //for each row in the list, loop
        {
            fileElements = (in.nextLine()).split(","); //puts the details into an array by using a comma to split the details
            users.get(0).add(fileElements[0]);        //the users.txt file is in the format 'username','password',score
            users.get(1).add(fileElements[1]);
            users.get(2).add((fileElements[2]));    //adds each seperate users details into the array list for ease of use
        }

        in.close(); //ends association between scanner and file

        while(!validInput && chances!=0)
        {
            username = JOptionPane.showInputDialog(null,"Enter your username you have only " + chances + " chance(s) remaining");
            password = JOptionPane.showInputDialog(null,"Enter your password"); //Allows user to enter name and password
            for(int j = 0;j<users.get(0).size();j++)                            //and stores them in variables
            {
                //goes through each element in the list
                if(username.equals(users.get(0).get(j)) && password.equals(users.get(1).get(j))) //compares details entered to each element
                {                                                                               //in the array lists
                    validInput = true;
                    JOptionPane.showMessageDialog(null,"Login details are valid");
                    userScore = users.get(2).get(j); //Since we have username, we must access score when details are at correct index
                }
            }
            if(!validInput)
            {
                chances--; //decrement chances if the details entered are incorrect
                JOptionPane.showMessageDialog(null,"Login details entered were invalid");
            }
        }
        if(validInput)
        {
            String[] details =  {username,userScore};
            return details; //returns the details required
        }
        else
        {
            String[] details = {"",""};
            return details; //If the input is incorrect, return these values
        }
    }
}