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

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

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

import net.sourceforge.fenixedu.applicationTier.Filtro.exception.FenixFilterException;
import net.sourceforge.fenixedu.applicationTier.Servico.exceptions.FenixServiceException;
import net.sourceforge.fenixedu.applicationTier.Servico.publico.ReadExecutionCoursesForCurrentAndPreviousPeriodByDegree;
import net.sourceforge.fenixedu.commons.collections.Table;
import net.sourceforge.fenixedu.dataTransferObject.ExecutionCourseView;
import net.sourceforge.fenixedu.dataTransferObject.InfoDegree;
import net.sourceforge.fenixedu.dataTransferObject.InfoExecutionPeriod;
import net.sourceforge.fenixedu.domain.Degree;
import net.sourceforge.fenixedu.domain.ExecutionSemester;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixContextDispatchAction;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction;
import net.sourceforge.fenixedu.presentationTier.Action.resourceAllocationManager.utils.PresentationConstants;
import net.sourceforge.fenixedu.presentationTier.Action.utils.ContextUtils;
import net.sourceforge.fenixedu.util.PeriodState;

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

public class ShowExecutionCourseSitesDispatchAction extends FenixDispatchAction {

    @Override
    public ActionForward execute(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	ContextUtils.setExecutionPeriodContext(request);
	return super.execute(mapping, actionForm, request, response);
    }

    public ActionForward listSites(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	final Degree degree = ShowDegreeSiteAction.getDegree(request);

	// degreeID
	final Integer degreeOID = FenixContextDispatchAction.getFromRequest("degreeID", request);
	getDegreeAndSetInfoDegree(request, degreeOID);
	final List<ExecutionCourseView> executionCourseViews = getExecutionCourseViews(request, degree);
	final InfoExecutionPeriod infoExecutionPeriod = getPreviousExecutionPeriod(request);

	organizeExecutionCourseViews(request, executionCourseViews, infoExecutionPeriod);

	return mapping.findForward("show-exeution-course-site-list");
    }

    private Degree getDegreeAndSetInfoDegree(HttpServletRequest request, Integer degreeOID) {
	final Degree degree = rootDomainObject.readDegreeByOID(degreeOID);

	final InfoDegree infoDegree = InfoDegree.newInfoFromDomain(degree);
	request.setAttribute("infoDegree", infoDegree);

	return degree;
    }

    private InfoExecutionPeriod getPreviousExecutionPeriod(HttpServletRequest request) {
	final InfoExecutionPeriod infoExecutionPeriod = (InfoExecutionPeriod) request
		.getAttribute(PresentationConstants.EXECUTION_PERIOD);

	final ExecutionSemester executionSemester = infoExecutionPeriod.getExecutionPeriod();
	final ExecutionSemester nextExecutionSemester = executionSemester.getNextExecutionPeriod();
	final InfoExecutionPeriod previousInfoExecutionPeriod;
	if (nextExecutionSemester != null && nextExecutionSemester.getState().equals(PeriodState.OPEN)) {
	    previousInfoExecutionPeriod = InfoExecutionPeriod.newInfoFromDomain(nextExecutionSemester);
	} else {
	    previousInfoExecutionPeriod = infoExecutionPeriod.getPreviousInfoExecutionPeriod();
	}

	request.setAttribute("previousInfoExecutionPeriod", previousInfoExecutionPeriod);
	return previousInfoExecutionPeriod;
    }

    private List<ExecutionCourseView> getExecutionCourseViews(HttpServletRequest request, Degree degree)
	    throws FenixServiceException, FenixFilterException {

	List<ExecutionCourseView> result = new ArrayList(
		(Collection<ExecutionCourseView>) ReadExecutionCoursesForCurrentAndPreviousPeriodByDegree.run(degree));
	Collections.sort(result, ExecutionCourseView.COMPARATOR_BY_NAME);

	return result;
    }

    private void organizeExecutionCourseViews(HttpServletRequest request, List<ExecutionCourseView> executionCourseViews,
	    InfoExecutionPeriod previousExecutionPeriod) {
	Table executionCourseViewsTableCurrent1_2 = new Table(2);
	Table executionCourseViewsTableCurrent3_4 = new Table(2);
	Table executionCourseViewsTableCurrent5 = new Table(1);
	Table executionCourseViewsTablePrevious1_2 = new Table(2);
	Table executionCourseViewsTablePrevious3_4 = new Table(2);
	Table executionCourseViewsTablePrevious5 = new Table(1);

	for (ExecutionCourseView executionCourseView : executionCourseViews) {
	    int curricularYear = executionCourseView.getCurricularYear();
	    boolean previousExecPeriod = previousExecutionPeriod != null
		    && executionCourseView.getExecutionPeriodOID().equals(previousExecutionPeriod.getIdInternal());

	    switch (curricularYear) {
	    case 1:
	    case 2:
		if (previousExecPeriod) {
		    executionCourseViewsTablePrevious1_2.appendToColumn(curricularYear - 1, executionCourseView);
		} else {
		    executionCourseViewsTableCurrent1_2.appendToColumn(curricularYear - 1, executionCourseView);
		}
		break;
	    case 3:
	    case 4:
		if (previousExecPeriod) {
		    executionCourseViewsTablePrevious3_4.appendToColumn(curricularYear - 3, executionCourseView);
		} else {
		    executionCourseViewsTableCurrent3_4.appendToColumn(curricularYear - 3, executionCourseView);
		}
		break;
	    case 5:
		if (previousExecPeriod) {
		    executionCourseViewsTablePrevious5.appendToColumn(curricularYear - 5, executionCourseView);
		} else {
		    executionCourseViewsTableCurrent5.appendToColumn(curricularYear - 5, executionCourseView);
		}
		break;
	    }
	}

	request.setAttribute("executionCourseViewsTableCurrent1_2", executionCourseViewsTableCurrent1_2);
	request.setAttribute("executionCourseViewsTableCurrent3_4", executionCourseViewsTableCurrent3_4);
	request.setAttribute("executionCourseViewsTableCurrent5", executionCourseViewsTableCurrent5);

	request.setAttribute("executionCourseViewsTablePrevious1_2", executionCourseViewsTablePrevious1_2);
	request.setAttribute("executionCourseViewsTablePrevious3_4", executionCourseViewsTablePrevious3_4);
	request.setAttribute("executionCourseViewsTablePrevious5", executionCourseViewsTablePrevious5);
    }

}