package uk.ac.ebi.intenz.webapp.controller;
   
   import java.io.IOException;
   
   import javax.mail.Address;
   import javax.mail.Message;
   import javax.mail.MessagingException;
   import javax.mail.Session;
   import javax.mail.Transport;
  import javax.mail.internet.InternetAddress;
  import javax.mail.internet.MimeMessage;
  import javax.servlet.ServletException;
  import javax.servlet.ServletRequest;
  import javax.servlet.ServletResponse;
  import javax.servlet.http.HttpServlet;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.log4j.Logger;
  
  import uk.ac.ebi.biobabel.util.StringUtil;
  import uk.ac.ebi.intenz.webapp.IntEnzConfig;
  
  public class IntEnzContactServlet extends HttpServlet {
  
  	public static final Logger LOGGER = Logger.getLogger(IntEnzContactServlet.class);
  	
  	public void init() throws ServletException {
  		super.init();
  	}
  
  	public void doGet(HttpServletRequest request, HttpServletResponse response)
  	throws ServletException, IOException {
  		getServletContext().getRequestDispatcher("/contact.jsp").forward(request, response);
  	}
  
  	public void doPost(HttpServletRequest request, HttpServletResponse response)
  	throws ServletException, IOException {
  
  		if (request.getParameter("intenzMail") == null){
  			getServletContext().getRequestDispatcher("/contact.jsp").forward(request, response);
  		}
  
  		String from = request.getParameter("email");
  //		String subject = request.getParameter("subject");
  		String messageText = request.getParameter("message");
  		
  		if (StringUtil.isNullOrEmpty(from)){
  			processError(request, response, "The e-mail address must not be empty!");
  			return;
  		}
  		if (StringUtil.isNullOrEmpty(messageText)){
  			processError(request, response, "The message text must not be empty!");
  			return;
  		}
  //		if (StringUtil.isNullOrEmpty(subject)) subject = "IntEnz";
  		
  		try {
  			sendMail(from, messageText);
  			request.setAttribute("sent", Boolean.TRUE);
  			getServletContext().getRequestDispatcher("/contact.jsp").forward(request, response);
  		} catch (MessagingException e) {
  			if (e.getMessage().indexOf("553") > -1){
  				processError(request, response, "Sorry, the provided e-mail address is not valid.");
  			} else {
  				processError(request, response, "Sorry, the message could not be sent. Please try again later.");
  			}
  		}
  	}
  
  	private void processError(ServletRequest request, ServletResponse response, String errorText)
  	throws ServletException, IOException {
  		request.setAttribute("sent", Boolean.FALSE);
  		request.setAttribute("error", errorText);
  		getServletContext().getRequestDispatcher("/contact.jsp").forward(request, response);
  	}
  
  	private void sendMail(String from, String messageText)
  	throws MessagingException, IOException{
  		try{
  			Session mailSession = Session.getInstance(
  					IntEnzConfig.getInstance().getMailProperties());
  			MimeMessage message = new MimeMessage(mailSession);
  			Address fromAddress = new InternetAddress(from);
  			message.setFrom(fromAddress);
  			Address[] toAddress =
  				InternetAddress.parse(IntEnzConfig.getInstance().getContactMailTo());
  			message.setRecipients(Message.RecipientType.TO, toAddress);
  			message.setSubject(IntEnzConfig.getInstance().getContactMailSubject());
  			message.setText(messageText);
  			Transport.send(message);
  		} catch (MessagingException e){
  			LOGGER.error("There has been an error sending an email from " + from, e);
  			throw e;
  		}
  		
  	}
  }