import java.awt.*;
import java.awt.event.*;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.StringTokenizer;

import javax.swing.*;

public class Login extends JFrame{
	private JButton botao;
	private JLabel nome, pass;
	private JComboBox box;
	private String list[] = {"",""};
	private JTextField n;
	private JPasswordField camp;
	private Container cont;

	public Login(){
		super("Login");
		cont = getContentPane();
		cont.setLayout(new FlowLayout());

		nome = new JLabel ("Username: ");
		cont.add(nome);
		n = new JTextField(15);
		cont.add(n);

		pass = new JLabel ("Password: ");
		cont.add(pass);
		camp = new JPasswordField(15);
		cont.add(camp);

		botao = new JButton("Entrar");
		botao.setHorizontalTextPosition(SwingConstants.CENTER);
		cont.add(botao);
		TrataEvento tv = new TrataEvento();
		botao.addActionListener(tv);

		getContentPane().setBackground(Color.CYAN);
		setSize(300, 150);
		setVisible(true);
	}

	public boolean ler(){
		String pass, umaLinha = "";
		StringTokenizer umaCadeia;

		try{
			FileReader fr = new FileReader("Password.txt");
			BufferedReader br = new BufferedReader(fr);

			umaLinha = br.readLine();
			while(umaLinha != null){
				umaCadeia = new StringTokenizer(umaLinha);
				pass = umaCadeia.nextToken();
			}

			br.readLine();

		}catch(NumberFormatException e){

			e.getMessage();

		}catch(FileNotFoundException f) {

			f.getMessage();

		}catch(IOException t){

			t.getMessage();

		}

		return true;
	}


	private class TrataEvento implements ActionListener{
		public void actionPerformed(ActionEvent ev)
		{

			UserDataFileReader dataFileReader = new UserDataFileReader(UserData.FILES_DATA);

			UserData successfulUserData = dataFileReader.getUserData();

			UserData data = new UserData(n.getText(), camp.getText());

			if(data.equals(successfulUserData)){

				JOptionPane.showMessageDialog(null, "Username e Password correcta!");

			}else{

				JOptionPane.showMessageDialog(null, "Username ou Password errada!\nTente novamente.");

			}

		}
	}

	public static void main (String [] args){
		Login l = new Login();
		l.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

class UserData{
  	private String username;
  	private String password;

  	public static String FILES_DATA = "Password.txt";

  	public UserData(String username, String password){
  		this.username = username;
  		this.password = password;
  	}

  	public String getUserName(){
  		return username;
  	}

  	public String getPassword(){
  		return password;
  	}

  	public void setUserName(String username){
  		this.username = username;
  	}

  	public void setPassword(String password){
  		this.password = password;
  	}

  	public static UserData getUserData(){
  		return new UserData("Nocaida", "003Open");
  	}

  	public boolean equals(Object obj){
  		if(!(obj instanceof UserData)){
  			return false;
  		}

  		UserData userData = (UserData)obj;
  		return userData.getUserName().equals(this.getUserName()) && userData.getPassword().equals(this.getPassword());
  	}

  	//So para mock;
  	//So para testes, não é necessario ler o ficheiro
  	public static UserData DEFAULT_USER_DATA = new UserData("Nocaida", "003Open");
  }

 class UserDataFileReader{
  	private String filename;

  	public UserDataFileReader(String filename){
  		this.filename = filename;
  	}

  	public UserData getUserData()
	{
		try{
			String lines = new String(java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(filename)));

			return new UserData(lines.split(";")[0], lines.split(";")[1]);
		}catch(Exception ex){

			ex.printStackTrace();
			return UserData.DEFAULT_USER_DATA;

		}
	}
}