import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Scanner;

public class settings {

    void writeSettings() throws IOException {

        String key, username, password, autologin;

        Scanner scan = new Scanner(System.in);
        File settings = new File("settings.txt");
        boolean exists = settings.exists();

        if (!exists) {

            FileWriter fw = new FileWriter(settings);
            BufferedWriter bw = new BufferedWriter(fw);

            System.out.println("It looks like this is your first time launching the client.");
            System.out.print("Please enter your key: ");
            key = scan.nextLine();
            System.out.print("Username: ");
            username = scan.nextLine();
            System.out.print("Password: ");
            password = scan.nextLine();
            System.out.print("Would you like to enable autologin? (y/n): ");
            autologin = scan.nextLine();

            bw.write(key);
            bw.newLine();
            bw.write(username);
            bw.newLine();
            bw.write(password);
            bw.newLine();
            bw.write(autologin);
            bw.close();

            readSettings();

        }

        else if(exists) {

            readSettings();

        }

    }

    void readSettings() throws IOException {

        String keyRead, usernameRead, passwordRead, autologinRead;

        BufferedReader read = new BufferedReader(new FileReader("settings.txt"));

        keyRead = read.readLine();

        usernameRead = keyRead;

        while (usernameRead.equals(keyRead) && usernameRead != null) {

            usernameRead = read.readLine();

        }

        passwordRead = usernameRead;

        while (passwordRead.equals(usernameRead) && !passwordRead.equals(keyRead) && passwordRead != null) {

            passwordRead = read.readLine();

        }

        autologinRead = passwordRead;

        while (autologinRead.equals(passwordRead) && !autologinRead.equals(usernameRead) && autologinRead != null) {

        autologinRead = read.readLine();

        }


        if (!keyRead.equals("153344985")) {

            System.out.println("Invalid key");

        }

        String logins[][] = {{"valon", "jamie", "admin"},
                            {"leet", "leet", "supercool"}};

        if (autologinRead.equals("y")) {

            if ((usernameRead.equals(logins[0][0]) && passwordRead.equals(logins[1][0]))||
                (usernameRead.equals(logins[0][1]) && passwordRead.equals(logins[1][1]))||
                (usernameRead.equals(logins[0][2]) && passwordRead.equals(logins[1][2]))) {

                System.out.println("Welcome " + usernameRead);

            }

            else {

                System.out.println("Invalid username or password.");

            }
        }

        else if(autologinRead.equals("n")) {

            String username, password;

            Scanner scan = new Scanner(System.in);

            System.out.print("Username: ");
            username = scan.nextLine();
            System.out.print("Password: ");
            password = scan.nextLine();

                if ((username.equals(logins[0][0]) && password.equals(logins[1][0]))||
                    (username.equals(logins[0][1]) && password.equals(logins[1][1]))||
                    (username.equals(logins[0][2]) && password.equals(logins[1][2]))) {

                    System.out.println("Welcome "  + username);

                }

                else {

                    System.out.println("Invalid username or password.");

                }

        }

        else {

            System.out.println("Invalid username or password.");

        }
    }
}