//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
//PIMS: Personal Invstment Management System
//Class : Login
//This class displays the PIMS login screen. After taking the input from the
//user, it calls the authenticate function of the dataRepository with the login name
//as the parameter. The authenticate method of the dataRepository class returns 
//the password, which is crosschecked with the password entered.
//If the authentication is successfull PIMS is started, else the user is
//given another chance. In all the user is given 3 chances to validate. Presently
//the authentication system is trivial, it does not involve any encryption. The username
//and passwords are just strings. However with the given framework encryption
//routines can be easily employed to get a better authentication system.
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
import javax.swing.*;
import java.lang.*;
import java.io.*;
import java.util.*;

public class Login extends JFrame implements ActionListener{

	private SecurityManager SM;
	private GUI g;
	private String login;
	private String password;

	private int chances = 0;

	Label logl;
	TextField log;
	Label passl;
	TextField pass;
	Button ok;
	Button cancel;

	public Login(SecurityManager SM, GUI g){

		this.SM = SM;
		this.g = g;

		login = "";
		password = "";

		authenticate();
	}

	private void authenticate(){
		setSize(300, 150);
		setLocation(320,280);
		setBackground(Color.white);
		setTitle("PIMS Authentication System");

		Container CP = getContentPane();
		CP.setBackground(Color.white);
		CP.setLayout(new GridLayout(3,1));

		Panel pan1 = new Panel();
		Panel pan2 = new Panel();
		Panel pan3 = new Panel();

		logl = new Label("Login");
		log = new TextField(15);
		pan1.add(logl);pan1.add(log);

		passl = new Label("Password");
		pass = new TextField(15);
		pass.setEchoChar('*');
		pan2.add(passl);pan2.add(pass);

		ok = new Button("Ok");
		ok.addActionListener(this);
		cancel = new Button("Cancel");
		cancel.addActionListener(this);
		pan3.add(ok);pan3.add(cancel);

		CP.add(pan1);
		CP.add(pan2);
		CP.add(pan3);

		setVisible(true);
	}

	public void actionPerformed(ActionEvent ae){

	   try{
		String action = ae.getActionCommand();
		String logt = log.getText();
		String passt = pass.getText();

		if(action.equals("Ok")){
			if(logt.equals("") || passt.equals("")){
				Error e = new Error("Login or Password not Entered.");
				return;
			}
			if(SM.ValidateUser(logt, passt)){
				setVisible(false);
				g.makeGUI();				
			}
			else{
				Error e = new Error("Authentication Failed");
				if(chances == 3)System.exit(-1);
				chances++;
			 }
		}
		if(action.equals("Cancel"))System.exit(0);
	   }catch(Exception e){}
	}
}