package net.sourceforge.fenixedu.domain.accessControl;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import net.sourceforge.fenixedu.domain.Attends;
import net.sourceforge.fenixedu.domain.Coordinator;
import net.sourceforge.fenixedu.domain.CurricularCourse;
import net.sourceforge.fenixedu.domain.Degree;
import net.sourceforge.fenixedu.domain.ExecutionCourse;
import net.sourceforge.fenixedu.domain.ExecutionDegree;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.Argument;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.GroupBuilder;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.exceptions.GroupDynamicExpressionException;
import net.sourceforge.fenixedu.domain.accessControl.groups.language.operators.IdOperator;
import net.sourceforge.fenixedu.domain.student.Registration;

/**
 * This group represents the group of students associated to at least one degree
 * where a specific execution course is present
 * 
 * @author cmej
 */
public class DegreesOfExecutionCourseGroup extends ExecutionCourseGroup {

    /**
     * Serial version id.
     */
    private static final long serialVersionUID = 1L;

    public DegreesOfExecutionCourseGroup(ExecutionCourse executionCourse) {
	super(executionCourse);
    }

    @Override
    public Set<Person> getElements() {
	HashSet<Person> elements = new HashSet<Person>();
	if (hasExecutionCourse()) {
	    List<Degree> degreeList = new ArrayList<Degree>();
	    for (CurricularCourse curricularCourse : getExecutionCourse().getAssociatedCurricularCoursesSet()) {
		degreeList.add(curricularCourse.getDegree());
	    }
	    for (Degree degree : degreeList) {
		for (Registration registration : degree.getActiveRegistrations()) {
		    elements.add(registration.getPerson());
		}
	    }
	}
	return elements;
    }

    @Override
    public boolean isMember(Person person) {
	if (person != null && person.hasStudent() && hasExecutionCourse()) {
	    for (Registration registration : person.getStudent().getAllRegistrations()) {
		for (CurricularCourse curricularCourse : getExecutionCourse().getAssociatedCurricularCoursesSet()) {
		    if (curricularCourse.getDegree() == registration.getDegree()) {
			return true;
		    }
		}
	    }

	    for (final Attends attends : getExecutionCourse().getAttendsSet()) {
		if (attends.getRegistration().getStudent() == person.getStudent()) {
		    return true;
		}
	    }
	}

	return isDegreeCoordinator(person);
    }

    private boolean isDegreeCoordinator(final Person person) {
	if (person != null && person.hasAnyCoordinators()) {
	    final ExecutionCourse executionCourse = getExecutionCourse();
	    if (executionCourse != null) {
		final Set<ExecutionDegree> executionDegrees = executionCourse.getExecutionDegrees();
		for (final Coordinator coordinator : person.getCoordinatorsSet()) {
		    final ExecutionDegree executionDegree = coordinator.getExecutionDegree();
		    if (executionDegrees.contains(executionDegree)) {
			return true;
		    }
		}
	    }
	}
	return false;
    }

    @Override
    public boolean equals(Object object) {
	return object != null && object instanceof DegreesOfExecutionCourseGroup;
    }

    @Override
    public int hashCode() {
	return this.getClass().hashCode();
    }

    @Override
    protected Argument[] getExpressionArguments() {
	return new Argument[] { new IdOperator(getObject()) };
    }

    public static class Builder implements GroupBuilder {

	@Override
	public Group build(Object[] arguments) {
	    try {
		return new DegreesOfExecutionCourseGroup((ExecutionCourse) arguments[0]);
	    } catch (ClassCastException e) {
		throw new GroupDynamicExpressionException("accessControl.group.builder.executionCourse.notExecutionCourse",
			arguments[0].toString());
	    }
	}

	@Override
	public int getMinArguments() {
	    return 1;
	}

	@Override
	public int getMaxArguments() {
	    return 1;
	}

    }
}