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

import java.util.ArrayList;
import java.util.List;

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

import net.sourceforge.fenixedu.dataTransferObject.manager.academicCalendarManagement.CalendarEntryBean;
import net.sourceforge.fenixedu.domain.exceptions.DomainException;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendar;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendarEntry;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction;
import net.sourceforge.fenixedu.renderers.components.state.IViewState;
import net.sourceforge.fenixedu.renderers.utils.RenderUtils;
import net.sourceforge.fenixedu.util.renderer.GanttDiagram;
import net.sourceforge.fenixedu.util.renderer.GanttDiagramEvent;

import org.apache.jcs.access.exception.InvalidArgumentException;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

public class AcademicCalendarsManagementDA extends FenixDispatchAction {

    public ActionForward prepareChooseCalendar(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	List<AcademicCalendar> academicCalendars = rootDomainObject.getAcademicCalendars();
	request.setAttribute("academicCalendars", academicCalendars);
	return mapping.findForward("prepareChooseCalendar");
    }
   
    public ActionForward prepareCreateEntryForAcademicCalendar(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendar academicCalendar = getAcademicCalendarFromParameter(request);
	request.setAttribute("calendarEntryBean", new CalendarEntryBean(academicCalendar));
	return mapping.findForward("prepareCreateCalendarEntry");
    }

    public ActionForward prepareCreateEntryForAcademicCalendarEntry(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendarEntry academicCalendarEntry = getAcademicCalendarEntryFromParameter(request);
	request.setAttribute("calendarEntryBean", new CalendarEntryBean(academicCalendarEntry));
	return mapping.findForward("prepareCreateCalendarEntry");
    }
    
    public ActionForward chooseCalendarEntryTypePostBack(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	IViewState viewState = RenderUtils.getViewState();	
	CalendarEntryBean bean = (CalendarEntryBean) viewState.getMetaObject().getObject();		
	request.setAttribute("calendarEntryBean", bean);
	return mapping.findForward("prepareCreateCalendarEntry");
    }
   
    public ActionForward viewAcademicCalendar(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendar academicCalendar = getAcademicCalendarFromParameter(request);
	return viewAcademicCalendarForAcademicCalendar(mapping, request, academicCalendar);
    }
    
    public ActionForward viewAcademicCalendarEntry(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendarEntry academicCalendarEntry = getAcademicCalendarEntryFromParameter(request);
	return viewAcademicCalendarForEntries(mapping, request, academicCalendarEntry);
    }
    
    public ActionForward prepareEditAcademicCalendar(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendar academicCalendar = getAcademicCalendarFromParameter(request);
	request.setAttribute("academicCalendar", academicCalendar);			
	return mapping.findForward("prepareEditAcademicCalendar");
    } 
    
    public ActionForward prepareEditAcademicCalendarEntry(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendarEntry academicCalendarEntry = getAcademicCalendarEntryFromParameter(request);
	request.setAttribute("calendarEntry", academicCalendarEntry);			
	return mapping.findForward("prepareCreateCalendarEntry");
    } 
    
    public ActionForward deleteAcademicCalendarEntry(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendarEntry academicCalendarEntry = getAcademicCalendarEntryFromParameter(request);	
	AcademicCalendar academicCalendar = academicCalendarEntry.getAcademicCalendar();
	AcademicCalendarEntry parentEntry = academicCalendarEntry.getParentEntry();
	
	try {
	    executeService("DeleteAcademicCalendarEntry", new Object[] {academicCalendarEntry});
	    
	} catch(DomainException domainException) {
	    addActionMessage(request, domainException.getMessage());
	    return viewAcademicCalendarForEntries(mapping, request, academicCalendarEntry);
	}
	
	if(parentEntry != null) {
	    request.setAttribute("academicCalendarEntryID", parentEntry.getIdInternal());
	    return viewAcademicCalendarForEntries(mapping, request, parentEntry);
	} else {
	    return viewAcademicCalendarForAcademicCalendar(mapping, request, academicCalendar);
	}	
    }
    
    public ActionForward deleteAcademicCalendar(ActionMapping mapping, ActionForm actionForm,
	    HttpServletRequest request, HttpServletResponse response) throws Exception {

	AcademicCalendar academicCalendar = getAcademicCalendarFromParameter(request);	
	try {
	    executeService("DeleteAcademicCalendar", new Object[] {academicCalendar});
	    
	} catch(DomainException domainException) {
	    addActionMessage(request, domainException.getMessage());
	    return viewAcademicCalendarForAcademicCalendar(mapping, request, academicCalendar);
	}	
	
	return prepareChooseCalendar(mapping, actionForm, request, response);
    }
    
    // Private Methods
    
    private ActionForward viewAcademicCalendarForAcademicCalendar(ActionMapping mapping, HttpServletRequest request, AcademicCalendar academicCalendar) throws InvalidArgumentException {
	List<AcademicCalendarEntry> entries = academicCalendar.getEntriesOrderByDate();
	request.setAttribute("academicCalendar", academicCalendar);
	generateTimeLine(request, entries);	
	return mapping.findForward("viewAcademicCalendar");
    }

    private ActionForward viewAcademicCalendarForEntries(ActionMapping mapping, HttpServletRequest request, AcademicCalendarEntry academicCalendarEntry) throws InvalidArgumentException {
	List<AcademicCalendarEntry> entries = academicCalendarEntry.getAcademicCalendar().getEntriesOrderByDate();
	request.setAttribute("calendarEntry", academicCalendarEntry);
	generateTimeLine(request, entries);	
	return mapping.findForward("viewAcademicCalendar");
    } 
    
    private void generateTimeLine(HttpServletRequest request, List<AcademicCalendarEntry> entries) throws InvalidArgumentException {	
	List<GanttDiagramEvent> newEntries = generateEntriesTree(request, entries);	
	GanttDiagram diagram = GanttDiagram.getNewTotalGanttDiagram(newEntries);	
	request.setAttribute("ganttDiagram", diagram);	
    }

    private List<GanttDiagramEvent> generateEntriesTree(HttpServletRequest request, List<AcademicCalendarEntry> entries) {
	List<GanttDiagramEvent> result = new ArrayList<GanttDiagramEvent>();
	for (AcademicCalendarEntry entry : entries) {
	    getSubEntriesTree(entry, result);
	}
	return result;
    }
       
    private void getSubEntriesTree(AcademicCalendarEntry entry, List<GanttDiagramEvent> result) {	
	result.add(entry);
	for (AcademicCalendarEntry subEntry : entry.getSubEntriesOrderByDate()) {
	    getSubEntriesTree(subEntry, result);
	}
    }

    private AcademicCalendar getAcademicCalendarFromParameter(final HttpServletRequest request) {
	final String calendarIDString = request.getParameter("academicCalendarID");
	final Integer calendarID = Integer.valueOf(calendarIDString);
	return rootDomainObject.readAcademicCalendarByOID(calendarID);
    }
        
    private AcademicCalendarEntry getAcademicCalendarEntryFromParameter(final HttpServletRequest request) {
	final String calendarIDString = request.getParameter("academicCalendarEntryID");
	final Integer calendarID = Integer.valueOf(calendarIDString);
	return rootDomainObject.readAcademicCalendarEntryByOID(calendarID);
    }    
}