package net.sourceforge.fenixedu.presentationTier.backBeans.departmentAdmOffice;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

import javax.faces.event.ActionEvent;
import javax.faces.model.SelectItem;

import net.sourceforge.fenixedu.applicationTier.Filtro.exception.FenixFilterException;
import net.sourceforge.fenixedu.applicationTier.Servico.departmentAdmOffice.UpdateDepartmentsCompetenceCourseManagementGroup;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.domain.Department;
import net.sourceforge.fenixedu.domain.Employee;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.accessControl.Group;
import net.sourceforge.fenixedu.presentationTier.backBeans.base.FenixBackingBean;

import org.apache.commons.beanutils.BeanComparator;
import org.apache.commons.collections.comparators.ComparatorChain;

import com.linkare.commons.metainfo.Linkare;

public class ManagementGroupsBackingBean extends FenixBackingBean {

    private List<Employee> employees = getEmployees();

    private Integer[] selectedPersonsIDsToAdd;
    private Integer[] selectedPersonsIDsToRemove;

    public Department getDepartment() {
	return (getUserView().getPerson().getEmployee() != null) ? getUserView().getPerson().getEmployee()
		.getCurrentDepartmentWorkingPlace() : null;
    }

    public List<Employee> getEmployees() {
	List<Employee> result = (getDepartment() != null) ? new ArrayList<Employee>(getDepartment()
		.getAllCurrentActiveWorkingEmployees()) : null;

	if (result != null) {
	    ComparatorChain chainComparator = new ComparatorChain();
	    chainComparator.addComparator(new BeanComparator("person.name"), false);
	    chainComparator.addComparator(new BeanComparator("employeeNumber"), false);
	    Collections.sort(result, chainComparator);
	}

	return result;
    }

    public List getDepartmentEmployeesSelectItems() {
	Group competenceCoursesManagementGroup = getDepartment().getCompetenceCourseMembersGroup();

	List<SelectItem> result = new ArrayList<SelectItem>(employees.size());
	for (Employee departmentEmployee : employees) {
	    Person person = departmentEmployee.getPerson();
	    if (competenceCoursesManagementGroup == null || !competenceCoursesManagementGroup.isMember(person)) {
		result.add(new SelectItem(person.getIdInternal(), person.getName() + " (" + person.getUsername() + ")"));
	    }
	}
	return result;

    }

    public int getDepartmentEmployeesSize() {
	return employees.size();
    }

    public List<SelectItem> getSelectedDepartmentEmployeesSelectItems() throws FenixFilterException, FenixServiceException {

	List<SelectItem> result = new ArrayList<SelectItem>();

	Group competenceCoursesManagementGroup = getDepartment().getCompetenceCourseMembersGroup();
	if (competenceCoursesManagementGroup != null) {
	    for (Person person : competenceCoursesManagementGroup.getElements()) {
		result.add(new SelectItem(person.getIdInternal(), person.getName() + " (" + person.getUsername() + ")"));
	    }
	}

	return result;
    }

    @Linkare(author = "Paulo Zenida", comments = "Implemented defensive copy to prevent the violation of a best practice")
    public void setSelectedPersonsIDsToAdd(final Integer[] selectedPersonsIDs) {
	this.selectedPersonsIDsToAdd = selectedPersonsIDs == null ? null : Arrays.copyOf(selectedPersonsIDs,
		selectedPersonsIDs.length);
    }

    public Integer[] getSelectedPersonsIDsToAdd() {
	return selectedPersonsIDsToAdd;
    }

    @Linkare(author = "Paulo Zenida", comments = "Implemented defensive copy to prevent the violation of a best practice")
    public void setSelectedPersonsIDsToRemove(final Integer[] selectedPersonsIDsToRemove) {
	this.selectedPersonsIDsToRemove = selectedPersonsIDsToRemove == null ? null : Arrays.copyOf(selectedPersonsIDsToRemove,
		selectedPersonsIDsToRemove.length);
    }

    public Integer[] getSelectedPersonsIDsToRemove() {
	return selectedPersonsIDsToRemove;
    }

    public void addMembers(ActionEvent event) throws FenixFilterException, FenixServiceException {
	if (selectedPersonsIDsToAdd != null) {

	    UpdateDepartmentsCompetenceCourseManagementGroup.run(getDepartment(), selectedPersonsIDsToAdd, null);
	}
	// avoid preset check-boxes after action
	selectedPersonsIDsToAdd = null;
	selectedPersonsIDsToRemove = null;
    }

    public void removeMembers(ActionEvent event) throws FenixFilterException, FenixServiceException {
	if (selectedPersonsIDsToRemove != null) {

	    UpdateDepartmentsCompetenceCourseManagementGroup.run(getDepartment(), null, selectedPersonsIDsToRemove);
	}
	// avoid preset check-boxes after action
	selectedPersonsIDsToAdd = null;
	selectedPersonsIDsToRemove = null;
    }

}