package net.sourceforge.fenixedu.domain;

import net.sourceforge.fenixedu.domain.exceptions.DomainException;

import org.joda.time.DateTime;

import pt.utl.ist.fenix.tools.util.i18n.MultiLanguageString;

public abstract class Alert extends Alert_Base {

    public Alert() {
	super();
	setRootDomainObject(RootDomainObject.getInstance());
	setRootDomainObjectForActiveAlerts(RootDomainObject.getInstance());
	setWhenCreated(new DateTime());
    }

    protected void init(final MultiLanguageString subject, final MultiLanguageString body) {
	checkParameters(subject, body);
	super.setSubject(subject);
	super.setBody(body);
	super.setActive(Boolean.TRUE);
    }

    private void checkParameters(MultiLanguageString subject, MultiLanguageString body) {
	check(subject, "error.alert.Alert.subject.cannot.be.null");
	check(body, "error.alert.Alert.body.cannot.be.null");
    }

    @Override
    public void setSubject(MultiLanguageString subject) {
	throw new DomainException("error.alert.Alert.cannot.modify.subject");
    }

    @Override
    public void setBody(MultiLanguageString body) {
	throw new DomainException("error.alert.Alert.cannot.modify.body");
    }

    @Override
    public void setActive(Boolean active) {
	throw new DomainException("error.net.sourceforge.fenixedu.domain.alert.Alert.cannot.modify.active");
    }

    @Override
    public MultiLanguageString getBody() {
	throw new DomainException("error.net.sourceforge.fenixedu.domain.alert.Alert.use.getFormattedBody.instead");
    }

    @Override
    public MultiLanguageString getSubject() {
	throw new DomainException("error.net.sourceforge.fenixedu.domain.alert.Alert.use.getFormattedSubject.instead");
    }

    public MultiLanguageString getFormattedBody() {
	return super.getBody();
    }

    public MultiLanguageString getFormattedSubject() {
	return super.getSubject();
    }

    public void fire() {
	if (isToDiscard()) {
	    discard();
	    return;
	}

	if (!isToFire()) {
	    return;
	}

	generateMessage();
	super.setFireDate(new DateTime());

	// check again, because alert may be discarded after send messages
	if (isToDiscard()) {
	    discard();
	}
    }

    public void discard() {
	super.setRootDomainObjectForActiveAlerts(null);
	super.setActive(false);
    }

    abstract public String getDescription();

    abstract protected boolean isToDiscard();

    abstract protected boolean isToFire();

    abstract protected void generateMessage();

    abstract public boolean isToSendMail();

    public boolean isCancelable() {
	return isToFire();
    }

}