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.presentationTier.Action.sop.utils.ServiceUtils;
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,v 1.1 2006/06/22 14:12:58 gedl Exp $
 */
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";

//        System.out.println("Got a request from " + request.getRemoteAddr());

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

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

//            System.out.println("Requesting address:" + address);

            try {
                ExpandExecutionCourseMailAlias.ForwardMailsReport report = (ExpandExecutionCourseMailAlias.ForwardMailsReport) ServiceUtils
                        .executeService(null, "ExpandExecutionCourseMailAlias", new Object[] { address,
                                emailAddressPrefix, mailingListDomainConfiguration() });

                switch (report.getStatus()) {
                case OK: {
                    StringBuffer buffer = new StringBuffer();
                    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);
        }

//        System.out.println("Over and out. Result: ------->" + result + "<-------");
        return null;

    }

    public static String mailingListDomainConfiguration() {
        try {
            if (properties == null) {
                properties = PropertiesManager.loadProperties("/SMTPConfiguration.properties");
            }
            return properties.getProperty("mailingList.host.name");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

    }

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

}