package net.sourceforge.fenixedu.applicationTier.Servico.teacher;

import java.util.List;

import net.sourceforge.fenixedu.applicationTier.FenixService;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.ExistingServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.InvalidArgumentsServiceException;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.Professorship;
import net.sourceforge.fenixedu.domain.Teacher;
import net.sourceforge.fenixedu.persistenceTier.ExcepcaoPersistencia;

import org.apache.commons.collections.CollectionUtils;
import org.apache.commons.collections.Predicate;

/**
 * @author Fernanda Quitério
 */
public class AssociateTeacher extends FenixService {

    /**
     * Executes the service.
     * 
     * @throws ExcepcaoPersistencia
     */
    public Boolean run(Integer infoExecutionCourseCode, Integer teacherNumber) throws FenixServiceException {
	Teacher iTeacher = Teacher.readByNumber(teacherNumber);
	if (iTeacher == null) {
	    throw new InvalidArgumentsServiceException();
	}

	ExecutionCourse iExecutionCourse = rootDomainObject.readExecutionCourseByOID(infoExecutionCourseCode);
	if (lectures(iTeacher, iExecutionCourse.getProfessorships())) {
	    throw new ExistingServiceException();
	}

	Professorship.create(false, iExecutionCourse, iTeacher, null);
	return true;
    }

    protected boolean lectures(final Teacher teacher, final List professorships) {
	return CollectionUtils.find(professorships, new Predicate() {

	    public boolean evaluate(Object arg0) {
		Professorship professorship = (Professorship) arg0;
		return professorship.getTeacher().getIdInternal().equals(teacher.getIdInternal());
	    }
	}) != null;
    }
}