/**
 * 
 */
package net.sourceforge.fenixedu.applicationTier.Servico.messaging;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.messaging.ExpandExecutionCourseMailAlias.ForwardMailsReport.AliasExpandingStatus;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.Professorship;
import net.sourceforge.fenixedu.domain.RootDomainObject;
import pt.ist.fenixWebFramework.services.Service;

/**
 * @author <a href="mailto:goncalo@ist.utl.pt"> Goncalo Luiz</a><br/>
 *         Created on May 18, 2006, 12:07:00 PM
 * 
 */
public class ExpandExecutionCourseMailAlias extends FenixService {

    public static class ForwardMailsReport {

	public static enum AliasExpandingStatus {
	    OK, INVALID_ADDRESS, UNKNOWN_EXECUTION_COURSE, DYNAMIC_MAIL_DELIVERY_DISABLE, INVALID_HOST, EC_SITE_NOT_AVAILABLE;
	}

	private AliasExpandingStatus status;

	private Collection<String> expandedAddresses = new ArrayList<String>();

	public Collection<String> getExpandedAddresses() {
	    return this.expandedAddresses;
	}

	public AliasExpandingStatus getStatus() {
	    return this.status;
	}
    }

    @Service
    public static ForwardMailsReport run(String address, String prefix, String host) throws FenixServiceException {
	ForwardMailsReport report = new ForwardMailsReport();

	Integer id = extractExecutionCourseId(address, prefix, host, report);
	if (id != null) {
	    ExecutionCourse course = RootDomainObject.getInstance().readExecutionCourseByOID(id);
	    if (course != null) {
		List<String> addresses = new ArrayList<String>();
		if (course.getSite() != null) {
		    if (course.getSite().getDynamicMailDistribution()) {
			for (Professorship professorship : course.getProfessorships()) {
			    addresses.add(professorship.getPerson().getEmail());
			}
			report.status = AliasExpandingStatus.OK;
			report.expandedAddresses = addresses;
		    } else {
			report.status = AliasExpandingStatus.DYNAMIC_MAIL_DELIVERY_DISABLE;
		    }
		} else {

		    report.status = AliasExpandingStatus.EC_SITE_NOT_AVAILABLE;
		}
	    } else {
		report.status = AliasExpandingStatus.UNKNOWN_EXECUTION_COURSE;
	    }
	}
	return report;

    }

    private static Integer extractExecutionCourseId(String address, String emailAddressPrefix, String host,
	    ForwardMailsReport report) {
	Integer result = null;
	if (address != null) {
	    String[] splittedAddress = address.split("@");
	    if (splittedAddress.length == 2) {
		if (splittedAddress[1].equals(host)) {
		    if (splittedAddress[0].startsWith(emailAddressPrefix)) {
			String stringId = splittedAddress[0].substring(emailAddressPrefix.length());
			try {
			    result = Integer.valueOf(stringId);
			} catch (NumberFormatException e) {
			    report.status = AliasExpandingStatus.INVALID_ADDRESS;
			}
		    } else {
			report.status = AliasExpandingStatus.INVALID_ADDRESS;
		    }
		} else {
		    report.status = AliasExpandingStatus.INVALID_HOST;
		}
	    } else {
		report.status = AliasExpandingStatus.INVALID_ADDRESS;
	    }
	} else {
	    report.status = AliasExpandingStatus.INVALID_ADDRESS;
	}
	return result;
    }
}