/**
 * The program displays a simple mail client................
 */


import java.io.*;
import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;


/** 
 * 
 * @author gurt0582
 *
 *
 *The class extends authonticator bacause first of all it will do password authentication then
 *it will send any message................
 */

public class MailClient
  extends Authenticator
{
	/**
	 * flag for reading message
	 */
  public static final int SHOW_MESSAGES = 1;
  
  /**
   * flag for clearing message
   */
  
  public static final int CLEAR_MESSAGES = 2;
  
  /**
   * flag for reading and then clearing the message
   */
  
  public static final int SHOW_AND_CLEAR =
    SHOW_MESSAGES + CLEAR_MESSAGES;
  
  protected String from;
  protected Session session;
  
  /**
   * PasswordAuthontication is just simple a repository for user name and password
   * it has only two methods getUserName()
   * and getPassword()
   */
  
  protected PasswordAuthentication authentication;
  
  
  
  public MailClient(String user,String password, String host)
  {
	  
	  /**
	   * calls the another construcor of the class
	   */
	 
	  
    this(user,password, host, false);
    
  }
  
  public MailClient(String user,String password, String host, boolean debug)
  {
    from = user + '@' + host;
    
    /**
     * here authontication is created means in authentication repository values are stored.............
     */
    authentication = new PasswordAuthentication(user, password);
    
    System.out.println("User is :"+authentication.getUserName()+" Password is:"+authentication.getPassword());
   
    
    /**
     * creating an instance of properties
     */
    Properties props = new Properties();
    
    /**
     * storing name and value pairs in property
     */
    props.put("mail.user", user);
    props.put("mail.host", host);
    
    
    /**
     * storing debug information
     */
    
    props.put("mail.debug", debug ? "true" : "false");
    
    /**
     * storing mail retrieval protocol
     */
    
    props.put("mail.store.protocol", "pop3");
    
    /**
     * storing mail transfer protocol
     */
    
    
    props.put("mail.transport.protocol", "smtp");
    
    /**
     * creating a session  instance of this property instance
     * @author gurt0582
     * @param props  is  the property class
     * @param this is the authenticator instance an authenticator instance knows how
     * to obtain authentication for a network connection.............
     */
    session = Session.getInstance(props, this);
   
    
  }
  
 



/**
   * When authentication is required, 
   * the system will invoke a method on the subclass (like getPasswordAuthentication). 
   */
  
  
  
  public PasswordAuthentication getPasswordAuthentication()
  {
    return authentication;
  }
  
  
  
  public void sendMessage(
    String to, String subject, String content)
      throws MessagingException
  {
    System.out.println("SENDING message from " + from + " to " + to);
    System.out.println();
    MimeMessage msg = new MimeMessage(session);
    msg.addRecipients(Message.RecipientType.TO, to);
    msg.setSubject(subject);
    msg.setText(content);
    Transport.send(msg);
  }
  
  public void checkInbox(int mode)  throws AuthenticationFailedException, MessagingException
  {
	  
    if (mode == 0) return;
    boolean show = (mode & SHOW_MESSAGES) > 0;
    boolean clear = (mode & CLEAR_MESSAGES) > 0;
    String action =
      (show ? "Show" : "") +
      (show && clear ? " and " : "") +
      (clear ? "Clear" : "");
    System.out.println(action + " INBOX for " + from);
    
    try
    {
    
    	
    Store store = session.getStore();
    
        store.connect();
    
   
    
   
    Folder root = store.getDefaultFolder();
    
    
    
    Folder inbox = root.getFolder("inbox");
    inbox.open(Folder.READ_WRITE);
    Message[] msgs = inbox.getMessages();
    if (msgs.length == 0 && show)
    {
      System.out.println("No messages in inbox");
    }
    for (int i = 0; i < msgs.length; i++)
    {
      MimeMessage msg = (MimeMessage)msgs[i];
      if (show)
      {
        System.out.println("    From: " + msg.getFrom()[0]);
        System.out.println(" Subject: " + msg.getSubject());
        System.out.println(" Content: " + msg.getContent());
      }
      if (clear)
      {
        msg.setFlag(Flags.Flag.DELETED, true);
      }
    }
    inbox.close(true);
    store.close();
    System.out.println();
    }
    catch(Exception e)
    {
    	System.out.println("hi :"+e);
    	e.printStackTrace();
    	
    }
   // Folder inbox = root.getFolder("inbox");
   // inbox.open(Folder.READ_WRITE);
   // Message[] msgs = inbox.getMessages();
  /*  if (msgs.length == 0 && show)
    {
      System.out.println("No messages in inbox");
    }
    for (int i = 0; i < msgs.length; i++)
    {
      MimeMessage msg = (MimeMessage)msgs[i];
      if (show)
      {
        System.out.println("    From: " + msg.getFrom()[0]);
        System.out.println(" Subject: " + msg.getSubject());
        System.out.println(" Content: " + msg.getContent());
      }
      if (clear)
      {
        msg.setFlag(Flags.Flag.DELETED, true);
      }
    }
    inbox.close(true);
    store.close();
    System.out.println();*/
  }
}