package net.sourceforge.fenixedu.presentationTier.Action.messaging;

import java.io.IOException;
import java.util.Properties;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.fenixedu._development.PropertiesManager;
import net.sourceforge.fenixedu.applicationTier.Servico.messaging.ExpandExecutionCourseMailAlias;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixAction;
import net.sourceforge.fenixedu.presentationTier.Action.exceptions.FenixActionException;
import net.sourceforge.fenixedu.util.HostAccessControl;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

/**
 * @author <a href="mailto:goncalo@ist.utl.pt">Goncalo Luiz</a> <br/>
 * <br/>
 * <br/>
 *         Created on 0:32:09,17/Out/2005
 * @version $Id: ExecutionCourseAliasExpandingAction.java 36441 2008-06-07
 *          00:49:33Z lepc $
 */
public class ExecutionCourseAliasExpandingAction extends FenixAction {

    public static String emailAddressPrefix = "course-";

    private static Properties properties;

    public ActionForward execute(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
	    HttpServletResponse response) throws FenixActionException {
	String result = "400 Error: Email alias expanding service did not run";

	if (HostAccessControl.isAllowed(this, request)) {

	    String address = request.getParameter("address");

	    try {
		ExpandExecutionCourseMailAlias.ForwardMailsReport report = (ExpandExecutionCourseMailAlias.ForwardMailsReport) ExpandExecutionCourseMailAlias
			.run(address, emailAddressPrefix, mailingListDomainConfiguration());

		switch (report.getStatus()) {
		case OK: {
		    StringBuilder buffer = new StringBuilder();
		    buffer.append("200 ");
		    boolean firstAddress = true;
		    for (String currentAddress : report.getExpandedAddresses()) {
			if (!firstAddress) {
			    buffer.append(",");
			}
			buffer.append(currentAddress);
			firstAddress = false;
		    }
		    buffer.append("\n");
		    result = buffer.toString();
		    break;
		}
		case DYNAMIC_MAIL_DELIVERY_DISABLE: {
		    result = "500 Target course has dynamic mail distribution in the DISABLED state\n";
		    break;
		}
		case EC_SITE_NOT_AVAILABLE: {
		    result = "500 Target course does not exist\n";
		    break;
		}
		case INVALID_ADDRESS: {
		    result = "500 Invalid address\n";
		    break;
		}
		case INVALID_HOST: {
		    result = "500 Invalid host\n";
		    break;
		}
		case UNKNOWN_EXECUTION_COURSE: {
		    result = "500 Target execution course does not exist\n";
		    break;
		}
		}
	    } catch (Exception e) {
		e.printStackTrace();
		result = "400 Got an exception when trying to send email: " + e.getClass().getName() + "\n";
	    }
	} else {
	    result = "500 requester not allowed\n";
	}
	try {
	    sendAnswer(response, result);
	} catch (IOException e) {
	    throw new FenixActionException(e);
	}

	return null;

    }

    public static String mailingListDomainConfiguration() {
	return PropertiesManager.getProperty("mailingList.host.name");
    }

    private void sendAnswer(HttpServletResponse response, String result) throws IOException {
	ServletOutputStream writer = response.getOutputStream();
	response.setContentType("text/plain");
	writer.print(result);
	writer.flush();
	response.flushBuffer();
    }

}