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

import net.sourceforge.fenixedu.applicationTier.Servico.manager.academicCalendarManagement.DeleteAcademicCalendarEntry;

import net.sourceforge.fenixedu.applicationTier.Servico.manager.academicCalendarManagement.CreateAcademicCalendarEntry;

import net.sourceforge.fenixedu.applicationTier.Servico.manager.academicCalendarManagement.CreateAcademicCalendarEntry;

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.ExecutionYear;
import net.sourceforge.fenixedu.domain.exceptions.DomainException;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendarEntry;
import net.sourceforge.fenixedu.domain.time.calendarStructure.AcademicCalendarRootEntry;
import net.sourceforge.fenixedu.presentationTier.Action.base.FenixDispatchAction;
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;
import org.joda.time.DateTime;
import org.joda.time.Partial;
import org.joda.time.YearMonthDay;

import pt.ist.fenixWebFramework.renderers.utils.RenderUtils;

public class AcademicCalendarsManagementDA extends FenixDispatchAction {

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

	ExecutionYear currentExecutionYear = ExecutionYear.readCurrentExecutionYear();

	Partial begin = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getBeginDateYearMonthDay());
	Partial end = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getEndDateYearMonthDay());

	CalendarEntryBean bean = CalendarEntryBean.createAcademicCalendarBean(begin, end);
	request.setAttribute("parentEntryBean", bean);

	return mapping.findForward("prepareCreateCalendarEntry");
    }

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

	List<AcademicCalendarRootEntry> academicCalendars = rootDomainObject.getAcademicCalendars();
	request.setAttribute("academicCalendars", academicCalendars);

	return mapping.findForward("prepareChooseCalendar");
    }

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

	AcademicCalendarEntry academicCalendar = getAcademicCalendarEntryFromParameter(request);
	ExecutionYear currentExecutionYear = ExecutionYear.readCurrentExecutionYear();

	Partial begin = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getBeginDateYearMonthDay());
	Partial end = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getEndDateYearMonthDay());

	CalendarEntryBean bean = CalendarEntryBean.createCalendarEntryBeanToCreateEntry(
		(AcademicCalendarRootEntry) academicCalendar, academicCalendar, begin, end);

	return generateGanttDiagram(mapping, request, bean);
    }

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

	CalendarEntryBean bean = (CalendarEntryBean) getRenderedObject("datesToDisplayID");

	YearMonthDay beginDate = bean.getBeginDateToDisplayInYearMonthDayFormat();
	YearMonthDay endDate = bean.getEndDateToDisplayInYearMonthDayFormat();

	if (beginDate.isAfter(endDate)) {
	    addActionMessage(request, "error.begin.after.end");
	    ExecutionYear currentExecutionYear = ExecutionYear.readCurrentExecutionYear();
	    Partial begin = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getBeginDateYearMonthDay());
	    Partial end = CalendarEntryBean.getPartialFromYearMonthDay(currentExecutionYear.getEndDateYearMonthDay());
	    bean = CalendarEntryBean.createCalendarEntryBeanToCreateEntry(bean.getRootEntry(), bean.getRootEntry(), begin, end);
	    RenderUtils.invalidateViewState("datesToDisplayID");
	    return generateGanttDiagram(mapping, request, bean);
	}

	return generateGanttDiagram(mapping, request, bean);
    }

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

	CalendarEntryBean bean = (CalendarEntryBean) getRenderedObject();
	return generateGanttDiagram(mapping, request, bean);
    }

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

	AcademicCalendarEntry entry = getAcademicCalendarEntryFromParameter(request);
	AcademicCalendarRootEntry rootEntry = getAcademicCalendarRootEntryFromParameter(request);

	Partial beginPartial = getBeginFromParameter(request);
	Partial endPartial = getEndFromParameter(request);

	CalendarEntryBean bean = CalendarEntryBean.createCalendarEntryBeanToCreateEntry(rootEntry, entry, beginPartial,
		endPartial);

	return generateGanttDiagram(mapping, request, bean);
    }

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

	CalendarEntryBean bean = (CalendarEntryBean) getRenderedObject("calendarEntryBeanWithType");
	if (bean == null) {
	    bean = (CalendarEntryBean) getRenderedObject("createdEntryBeanID");
	}

	request.setAttribute("parentEntryBean", bean);
	return mapping.findForward("prepareCreateCalendarEntry");
    }

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

	AcademicCalendarEntry parentEntry = getAcademicCalendarEntryFromParameter(request);
	AcademicCalendarRootEntry rootEntry = getAcademicCalendarRootEntryFromParameter(request);

	Partial beginPartial = getBeginFromParameter(request);
	Partial endPartial = getEndFromParameter(request);

	request.setAttribute("parentEntryBean", CalendarEntryBean.createCalendarEntryBeanToCreateEntry(rootEntry, parentEntry,
		beginPartial, endPartial));

	return mapping.findForward("prepareCreateCalendarEntry");
    }

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

	CalendarEntryBean bean = (CalendarEntryBean) getRenderedObject("createdEntryBeanID");

	AcademicCalendarEntry entry = null;
	try {
	    entry = (AcademicCalendarEntry) CreateAcademicCalendarEntry.run(bean, true);

	} catch (DomainException e) {
	    addActionMessage(request, e.getMessage(), e.getArgs());
	    request.setAttribute("parentEntryBean", bean);
	    return mapping.findForward("prepareCreateCalendarEntry");
	}

	return generateGanttDiagram(mapping, request, CalendarEntryBean.createCalendarEntryBeanToCreateEntry(
		entry.getRootEntry(), entry, bean.getBeginDateToDisplay(), bean.getEndDateToDisplay()));
    }

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

	AcademicCalendarEntry entry = getAcademicCalendarEntryFromParameter(request);
	AcademicCalendarRootEntry rootEntry = getAcademicCalendarRootEntryFromParameter(request);

	Partial beginPartial = getBeginFromParameter(request);
	Partial endPartial = getEndFromParameter(request);

	request.setAttribute("entryBean", CalendarEntryBean.createCalendarEntryBeanToEditEntry(rootEntry, entry, beginPartial,
		endPartial));

	return mapping.findForward("prepareCreateCalendarEntry");
    }

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

	CalendarEntryBean bean = (CalendarEntryBean) getRenderedObject("editedEntryBeanID");

	AcademicCalendarEntry entry = null;
	try {
	    entry = (AcademicCalendarEntry) CreateAcademicCalendarEntry.run(bean, false);

	} catch (DomainException e) {
	    addActionMessage(request, e.getMessage(), e.getArgs());
	    request.setAttribute("entryBean", bean);
	    return mapping.findForward("prepareCreateCalendarEntry");
	}

	return generateGanttDiagram(mapping, request, CalendarEntryBean.createCalendarEntryBeanToCreateEntry(
		entry.getRootEntry(), entry, bean.getBeginDateToDisplay(), bean.getEndDateToDisplay()));
    }

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

	AcademicCalendarEntry entry = getAcademicCalendarEntryFromParameter(request);
	AcademicCalendarRootEntry rootEntry = getAcademicCalendarRootEntryFromParameter(request);

	AcademicCalendarRootEntry entryRootEntry = entry.getRootEntry();
	AcademicCalendarEntry entryParentEntry = entry.getParentEntry();

	boolean deletedRootEntry = entry.isRoot();

	Partial beginPartial = getBeginFromParameter(request);
	Partial endPartial = getEndFromParameter(request);

	try {
	    DeleteAcademicCalendarEntry.run(entry, rootEntry);

	} catch (DomainException domainException) {
	    addActionMessage(request, domainException.getMessage());
	    return generateGanttDiagram(mapping, request, CalendarEntryBean.createCalendarEntryBeanToCreateEntry(rootEntry,
		    entry, beginPartial, endPartial));
	}

	if (deletedRootEntry) {
	    return prepareChooseCalendar(mapping, actionForm, request, response);

	} else if (entryParentEntry != null) {
	    return generateGanttDiagram(mapping, request, CalendarEntryBean.createCalendarEntryBeanToCreateEntry(rootEntry,
		    entryParentEntry, beginPartial, endPartial));

	} else {
	    return generateGanttDiagram(mapping, request, CalendarEntryBean.createCalendarEntryBeanToCreateEntry(rootEntry,
		    entryRootEntry, beginPartial, endPartial));
	}
    }

    // Private Methods

    private ActionForward generateGanttDiagram(ActionMapping mapping, HttpServletRequest request, CalendarEntryBean bean)
	    throws InvalidArgumentException {

	YearMonthDay beginDate = bean.getBeginDateToDisplayInYearMonthDayFormat();
	YearMonthDay endDate = bean.getEndDateToDisplayInYearMonthDayFormat();

	endDate = endDate.plusMonths(1).withDayOfMonth(1).minusDays(1);

	List<GanttDiagramEvent> newEntries = generateEntriesTree(request, bean.getRootEntry(), beginDate, endDate);
	GanttDiagram diagram = GanttDiagram.getNewTotalGanttDiagram(newEntries, beginDate, endDate);

	request.setAttribute("entryBean", bean);
	request.setAttribute("ganttDiagram", diagram);

	return mapping.findForward("viewAcademicCalendar");
    }

    private List<GanttDiagramEvent> generateEntriesTree(HttpServletRequest request, AcademicCalendarRootEntry academicCalendar,
	    YearMonthDay begin, YearMonthDay end) {

	DateTime beginDateTime = begin.toDateTimeAtMidnight();
	DateTime endDateTime = end.toDateTimeAtMidnight();

	List<GanttDiagramEvent> result = new ArrayList<GanttDiagramEvent>();
	for (AcademicCalendarEntry entry : academicCalendar.getChildEntriesWithTemplateEntriesOrderByDate(beginDateTime,
		endDateTime)) {
	    getSubEntriesTree(entry, result, beginDateTime, endDateTime);
	}
	return result;
    }

    private void getSubEntriesTree(AcademicCalendarEntry entry, List<GanttDiagramEvent> result, DateTime begin, DateTime end) {
	result.add(entry);
	for (AcademicCalendarEntry subEntry : entry.getChildEntriesWithTemplateEntriesOrderByDate(begin, end)) {
	    getSubEntriesTree(subEntry, result, begin, end);
	}
    }

    private AcademicCalendarEntry getAcademicCalendarEntryFromParameter(final HttpServletRequest request) {
	final String calendarIDString = request.getParameter("entryID");
	final Integer calendarID = Integer.valueOf(calendarIDString);
	return rootDomainObject.readAcademicCalendarEntryByOID(calendarID);
    }

    private AcademicCalendarRootEntry getAcademicCalendarRootEntryFromParameter(final HttpServletRequest request) {
	final String calendarIDString = request.getParameter("rootEntryID");
	final Integer calendarID = Integer.valueOf(calendarIDString);
	return (AcademicCalendarRootEntry) rootDomainObject.readAcademicCalendarEntryByOID(calendarID);
    }

    private Partial getBeginFromParameter(final HttpServletRequest request) {
	final String date = request.getParameter("begin");
	return CalendarEntryBean.getPartialFromString(date);
    }

    private Partial getEndFromParameter(final HttpServletRequest request) {
	final String date = request.getParameter("end");
	return CalendarEntryBean.getPartialFromString(date);
    }
}