package net.sourceforge.fenixedu.presentationTier.Action.directiveCouncil;

import java.io.Serializable;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sourceforge.fenixedu.domain.Degree;
import net.sourceforge.fenixedu.domain.DomainReference;
import net.sourceforge.fenixedu.domain.ExecutionDegree;
import net.sourceforge.fenixedu.domain.ExecutionYear;
import net.sourceforge.fenixedu.domain.degree.DegreeType;
import net.sourceforge.fenixedu.domain.interfaces.HasDegreeType;
import net.sourceforge.fenixedu.domain.interfaces.HasExecutionYear;
import net.sourceforge.fenixedu.domain.student.Registration;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction;
import net.sourceforge.fenixedu.presentationTier.Action.gep.ReportsByDegreeTypeDA;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

import pt.ist.fenixWebFramework.renderers.utils.RenderUtils;
import pt.ist.fenixWebFramework.struts.annotations.Forward;
import pt.ist.fenixWebFramework.struts.annotations.Forwards;
import pt.ist.fenixWebFramework.struts.annotations.Mapping;

@Mapping(path = "/studentStatistics", module = "directiveCouncil")
@Forwards( { @Forward(name = "show.student.statistics", path = "df.page.student.statistics") })
public class StudentStatisticsDA extends FenixDispatchAction {

    public static class ContextBean implements Serializable, HasExecutionYear, HasDegreeType {
	private DegreeType degreeType;
	private DomainReference<ExecutionYear> executionYearReference;
	private DomainReference<ExecutionDegree> executionDegreeReference;

	public DegreeType getDegreeType() {
	    return degreeType;
	}

	public void setDegreeType(DegreeType degreeType) {
	    this.degreeType = degreeType;
	}

	public ExecutionYear getExecutionYear() {
	    return executionYearReference == null ? null : executionYearReference.getObject();
	}

	public void setExecutionYear(final ExecutionYear executionYear) {
	    executionYearReference = executionYear == null ? null : new DomainReference<ExecutionYear>(executionYear);
	}

	public ExecutionDegree getExecutionDegree() {
	    return executionDegreeReference == null ? null : executionDegreeReference.getObject();
	}

	public void setExecutionDegree(final ExecutionDegree executionDegree) {
	    executionDegreeReference = executionDegree == null ? null : new DomainReference<ExecutionDegree>(executionDegree);
	}

	public ExecutionYear getExecutionYearFourYearsBack() {
	    final ExecutionYear executionYear = getExecutionYear();
	    return executionYear == null ? null : ReportsByDegreeTypeDA.getExecutionYearFourYearsBack(executionYear);
	}
    }

    public static class StatisticsBean implements Serializable {

	private final ContextBean contextBean;

	public StatisticsBean(final ContextBean contextBean) {
	    this.contextBean = contextBean;
	}

	public int getNumberOfRegisteredStudents() {
	    final ExecutionDegree executionDegree = contextBean.getExecutionDegree();
	    int counter = 0;
	    if (executionDegree == null) {
		final ExecutionYear executionYear = contextBean.getExecutionYear();
		final DegreeType degreeType = contextBean.getDegreeType();
		for (final Degree degree : rootDomainObject.getDegreesSet()) {
		    if (degree.getDegreeType() == degreeType) {
			counter += countDegreeRegistrations(executionYear, degree);
		    }
		}
	    } else {
		final Degree degree = executionDegree.getDegree();
		counter = countDegreeRegistrations(executionDegree.getExecutionYear(), degree);
	    }
	    return counter;
	}

	private int countDegreeRegistrations(final ExecutionYear executionYear, final Degree degree) {
	    int counter = 0;
	    for (final Registration registration : degree.getRegistrationsSet()) {
		if (registration.isRegistered(executionYear)) {
		    counter++;
		}
	    }
	    return counter;
	}

	public Boolean getShowResult() {
	    return (contextBean.getDegreeType() != null && contextBean.getExecutionYear() != null)
		    || contextBean.getExecutionDegree() != null;
	}
    }

    public ActionForward showStatistics(ActionMapping mapping, ActionForm form, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	ContextBean contextBean = (ContextBean) getRenderedObject();
	if (contextBean == null) {
	    contextBean = new ContextBean();
	    contextBean.setExecutionYear(ExecutionYear.readCurrentExecutionYear());
	}
	RenderUtils.invalidateViewState();
	request.setAttribute("contextBean", contextBean);
	request.setAttribute("statisticsBean", new StatisticsBean(contextBean));

	return mapping.findForward("show.student.statistics");
    }

}