/*
 * Author : Goncalo Luiz
 * Creation Date: Jul 4, 2006,3:26:38 PM
 */
package net.sourceforge.fenixedu.presentationTier.Action.messaging;

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

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

import net.sourceforge.fenixedu.commons.CollectionUtils;
import net.sourceforge.fenixedu.domain.Person;
import net.sourceforge.fenixedu.domain.contents.Content;
import net.sourceforge.fenixedu.domain.messaging.Announcement;
import net.sourceforge.fenixedu.domain.messaging.AnnouncementBoard;
import net.sourceforge.fenixedu.domain.messaging.AnnouncementBoardAccessLevel;
import net.sourceforge.fenixedu.domain.messaging.AnnouncementBoardAccessType;
import net.sourceforge.fenixedu.domain.messaging.ExecutionCourseAnnouncementBoard;
import net.sourceforge.fenixedu.domain.messaging.UnitAnnouncementBoard;
import net.sourceforge.fenixedu.domain.messaging.AnnouncementBoard.AnnouncementPresentationBean;
import net.sourceforge.fenixedu.util.PeriodState;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.joda.time.DateTime;

import pt.utl.ist.fenix.tools.util.CollectionPager;

/**
 * @author <a href="mailto:goncalo@ist.utl.pt">Goncalo Luiz</a><br>
 * <br>
 *         Created on Jul 4, 2006,3:26:38 PM
 * 
 */
public class AnnouncementsStartPageHandler extends AnnouncementManagement {

    private static final int RECENT_BOARDS_TO_SHOW = 40;
    private static final int PAGE_SIZE = 20;

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

	request.setAttribute("returnMethod", "news");
	request.setAttribute("announcements", getAnnouncementsToShow(request, actionForm));
	// request.setAttribute("announcementBoards", boardsToView(request));

	return mapping.findForward("news");
    }

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

	request.setAttribute("returnMethod", "start");
	request.setAttribute("bookmarkedAnnouncementBoards", getSortedBookmarkedBoards(request));
	request.setAttribute("currentExecutionCoursesAnnouncementBoards", getCurrentExecutionCoursesAnnouncementBoards(request));

	return mapping.findForward("startPage");
    }

    private List<AnnouncementBoard> getSortedBookmarkedBoards(final HttpServletRequest request) {
	final List<AnnouncementBoard> result = new ArrayList<AnnouncementBoard>(getLoggedPerson(request).getBookmarkedBoards());
	Collections.sort(result, AnnouncementBoard.BY_NAME);
	return result;
    }

    private Collection<AnnouncementBoard> getCurrentExecutionCoursesAnnouncementBoards(final HttpServletRequest request) {
	final List<AnnouncementBoard> result = new ArrayList<AnnouncementBoard>(getLoggedPerson(request)
		.getCurrentExecutionCoursesAnnouncementBoards());
	Collections.sort(result, AnnouncementBoard.BY_NAME);
	return result;
    }

    private List<AnnouncementBoard> getRecentBoards(HttpServletRequest request) {

	final List<AnnouncementBoard> result = new ArrayList<AnnouncementBoard>();

	final DateTime startDate = getStartDate(request);
	int toShowCount = AnnouncementsStartPageHandler.RECENT_BOARDS_TO_SHOW;

	for (final Content content : rootDomainObject.getContentsSet()) {
	    if (content.isAnAnnouncementBoard()) {
		final AnnouncementBoard board = (AnnouncementBoard) content;
		if (board.hasReader(getLoggedPerson(request)) || board.hasWriter(getLoggedPerson(request))) {
		    if (toShowCount == 0 || (startDate != null && board.getCreationDate().isBefore(startDate))) {
			break;
		    }
		    result.add(board);
		    toShowCount--;
		}
	    }
	}

	Collections.sort(result, AnnouncementBoard.NEWEST_FIRST);

	return result;
    }

    private DateTime getStartDate(HttpServletRequest request) {

	final String selectedTimeSpanString = request.getParameter("recentBoardsTimeSpanSelection");
	final RecentBoardsTimeSpanSelection selectedTimeSpan = (selectedTimeSpanString != null) ? RecentBoardsTimeSpanSelection
		.valueOf(selectedTimeSpanString) : RecentBoardsTimeSpanSelection.TS_LAST_WEEK;

	final DateTime now = new DateTime();
	DateTime startDate = null;

	switch (selectedTimeSpan) {
	case TS_ALL_ACTIVE:
	    break;
	case TS_LAST_WEEK:
	    startDate = now.minusDays(7);
	    break;
	case TS_ONE_MONTH:
	    startDate = now.minusDays(30);
	    break;
	case TS_TWO_MONTHS:
	    startDate = now.minusDays(60);
	    break;
	case TS_TODAY:
	    startDate = now.minusHours(now.hourOfDay().get());
	    startDate = startDate.minusMinutes(now.minuteOfHour().get());
	    startDate = startDate.minusSeconds(now.secondOfMinute().get());
	    break;
	case TS_TWO_WEEKS:
	    startDate = now.minusDays(15);
	    break;
	case TS_YESTERDAY:
	    startDate = now.minusDays(1);
	    break;
	}
	return startDate;
    }

    private Collection<Announcement> getAnnouncementsToShow(HttpServletRequest request, ActionForm actionForm) {

	final AnnouncementsStartPageForm form = (AnnouncementsStartPageForm) actionForm;

	final AnnouncementPresentationBean announcementPresentationBean = new AnnouncementPresentationBean(form
		.getHowManyAnnouncementsToShow(), Announcement.NEWEST_FIRST);

	if (form.getBoardType().equals("BOOKMARKED")) {
	    getBookmarkedAnnouncements(request, announcementPresentationBean);
	}

	if (form.getBoardType().equals("INSTITUTIONAL") || announcementPresentationBean.isEmpty()) {
	    getInstitutionalAnnouncements(request, announcementPresentationBean);
	    form.setBoardType("INSTITUTIONAL"); // because bean could be empty,
	    // must set this value
	}

	return announcementPresentationBean;
    }

    private void getInstitutionalAnnouncements(HttpServletRequest request,
	    final AnnouncementPresentationBean announcementPresentationBean) {
	if (rootDomainObject.hasInstitutionUnit()) {
	    for (final AnnouncementBoard board : rootDomainObject.getInstitutionUnit().getBoardsSet()) {
		addBoardAnnouncements(request, board, announcementPresentationBean);
	    }
	}
    }

    private void getBookmarkedAnnouncements(HttpServletRequest request,
	    final AnnouncementPresentationBean announcementPresentationBean) {
	for (final AnnouncementBoard board : getLoggedPerson(request).getBookmarkedBoards()) {
	    addBoardAnnouncements(request, board, announcementPresentationBean);
	}
    }

    private void addBoardAnnouncements(HttpServletRequest request, final AnnouncementBoard board,
	    final AnnouncementPresentationBean announcementPresentationBean) {
	final Person person = getLoggedPerson(request);
	if (board.hasReader(person) || board.hasWriter(person)) {
	    board.addVisibleAnnouncements(announcementPresentationBean);
	}
    }

    @Override
    protected String getExtraRequestParameters(HttpServletRequest request) {
	StringBuilder buffer = new StringBuilder();
	String announcementBoardAccessType = request.getParameter("announcementBoardAccessType");
	String announcementBoardAccessLevel = request.getParameter("announcementBoardAccessLevel");

	if (announcementBoardAccessType != null) {
	    buffer.append("&amp;announcementBoardAccessType=").append(announcementBoardAccessType);
	}
	if (announcementBoardAccessLevel != null) {
	    buffer.append("&amp;announcementBoardAccessLevel=").append(announcementBoardAccessLevel);
	}
	if (request.getParameter("howManyAnnouncementsToShow") != null) {
	    buffer.append("&amp;howManyAnnouncementsToShow=").append(request.getParameter("howManyAnnouncementsToShow"));
	}
	if (request.getParameter("recentBoardsTimeSpanSelection") != null) {
	    buffer.append("&amp;recentBoardsTimeSpanSelection=").append(request.getParameter("recentBoardsTimeSpanSelection"));
	}
	if (request.getParameter("boardType") != null) {
	    buffer.append("&amp;boardType=").append(request.getParameter("boardType"));
	}

	return buffer.toString();
    }

    @Override
    protected String getContextInformation(ActionMapping mapping, HttpServletRequest request) {
	return "/announcements/announcementsStartPageHandler.do";
    }

    @Override
    protected Collection<AnnouncementBoard> boardsToView(HttpServletRequest request) throws Exception {
	return getRecentBoards(request);
    }

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

	final AnnouncementsStartPageForm form = (AnnouncementsStartPageForm) actionForm;

	Collection<UnitAnnouncementBoard> unitAnnouncementBoards = new TreeSet<UnitAnnouncementBoard>(
		UnitAnnouncementBoard.BY_UNIT_DEPTH_AND_NAME);
	Collection<ExecutionCourseAnnouncementBoard> executionCourseAnnouncementBoards = new TreeSet<ExecutionCourseAnnouncementBoard>(
		ExecutionCourseAnnouncementBoard.COMPARE_BY_EXECUTION_PERIOD_AND_NAME);

	for (final Content content : rootDomainObject.getContentsSet()) {
	    if (content.isAnAnnouncementBoard()) {
		final AnnouncementBoard board = (AnnouncementBoard) content;
		if (board.hasReaderOrWriter(getLoggedPerson(request))) {
		    if (board instanceof UnitAnnouncementBoard) {
			unitAnnouncementBoards.add((UnitAnnouncementBoard) board);

		    } else if (board instanceof ExecutionCourseAnnouncementBoard) {
			ExecutionCourseAnnouncementBoard executionCourseBoard = (ExecutionCourseAnnouncementBoard) board;
			if (executionCourseBoard.hasExecutionCourse()
				&& executionCourseBoard.getExecutionCourse().getExecutionPeriod().getState().equals(
					PeriodState.CURRENT)) {
			    executionCourseAnnouncementBoards.add(executionCourseBoard);
			}
		    }
		}
	    }
	}

	final AnnouncementBoardAccessLevel level = AnnouncementBoardAccessLevel.valueOf(form.getAnnouncementBoardAccessLevel());
	final AnnouncementBoardAccessType type = AnnouncementBoardAccessType.valueOf(form.getAnnouncementBoardAccessType());

	unitAnnouncementBoards = (Collection<UnitAnnouncementBoard>) filterAnnouncementBoardsByLevelAndType(request,
		unitAnnouncementBoards, level, type);
	executionCourseAnnouncementBoards = (Collection<ExecutionCourseAnnouncementBoard>) filterAnnouncementBoardsByLevelAndType(
		request, executionCourseAnnouncementBoards, level, type);

	request.setAttribute("unitAnnouncementBoards", getPagedUnitAnnouncementBoard(unitAnnouncementBoards, request));
	request.setAttribute("executionCourseAnnouncementBoards", getPagedExecutionCourseAnnouncementBoard(
		executionCourseAnnouncementBoards, request));
	request.setAttribute("returnMethod", "handleBoardListing");

	return mapping.findForward("boardListingWithCriteria");
    }

    private Collection<? extends AnnouncementBoard> filterAnnouncementBoardsByLevelAndType(HttpServletRequest request,
	    Collection<? extends AnnouncementBoard> announcementBoards, final AnnouncementBoardAccessLevel level,
	    final AnnouncementBoardAccessType type) {
	announcementBoards = CollectionUtils.select(announcementBoards, new AnnouncementBoard.AcessLevelPredicate(level,
		getLoggedPerson(request)));
	announcementBoards = CollectionUtils.select(announcementBoards, new AnnouncementBoard.AcessTypePredicate(type,
		getLoggedPerson(request)));
	return announcementBoards;
    }

    private Collection<UnitAnnouncementBoard> getPagedUnitAnnouncementBoard(
	    Collection<UnitAnnouncementBoard> unitAnnouncementBoards, HttpServletRequest request) {
	final String pageNumberString = request.getParameter("pageNumberUnitBoards");
	final Integer pageNumber = pageNumberString != null && pageNumberString.length() > 0 ? Integer.valueOf(pageNumberString)
		: Integer.valueOf(1);
	request.setAttribute("pageNumberUnitBoards", pageNumber);
	final CollectionPager<UnitAnnouncementBoard> unitBoardsPager = new CollectionPager<UnitAnnouncementBoard>(
		unitAnnouncementBoards, PAGE_SIZE);
	request.setAttribute("numberOfPagesUnitBoards", Integer.valueOf(unitBoardsPager.getNumberOfPages()));
	return unitBoardsPager.getPage(pageNumber);
    }

    private Collection<ExecutionCourseAnnouncementBoard> getPagedExecutionCourseAnnouncementBoard(
	    Collection<ExecutionCourseAnnouncementBoard> executionCourseAnnouncementBoards, HttpServletRequest request) {
	final String pageNumberString = request.getParameter("pageNumberExecutionCourseBoards");
	final Integer pageNumber = pageNumberString != null && pageNumberString.length() > 0 ? Integer.valueOf(pageNumberString)
		: Integer.valueOf(1);
	request.setAttribute("pageNumberExecutionCourseBoards", pageNumber);

	final CollectionPager<ExecutionCourseAnnouncementBoard> executionCourseBoardsPager = new CollectionPager<ExecutionCourseAnnouncementBoard>(
		executionCourseAnnouncementBoards, PAGE_SIZE);
	request
		.setAttribute("numberOfPagesExecutionCourseBoards", Integer
			.valueOf(executionCourseBoardsPager.getNumberOfPages()));
	return executionCourseBoardsPager.getPage(pageNumber);
    }

    @Override
    public ActionForward removeBookmark(ActionMapping mapping, ActionForm form, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	super.removeBookmark(request);

	final String returnMethod = getReturnMethod(request);
	if (returnMethod != null) {
	    if (returnMethod.equals("news")) {
		return this.news(mapping, form, request, response);
	    } else if (returnMethod.equals("start")) {
		return this.start(mapping, form, request, response);
	    } else if (returnMethod.equals("handleBoardListing")) {
		return this.handleBoardListing(mapping, form, request, response);
	    }
	}
	return this.start(mapping, form, request, response);
    }

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

	super.createBookmark(request);
	final String returnMethod = getReturnMethod(request);
	if (returnMethod != null) {
	    if (returnMethod.equals("news")) {
		return this.news(mapping, actionForm, request, response);
	    } else if (returnMethod.equals("handleBoardListing")) {
		return this.handleBoardListing(mapping, actionForm, request, response);
	    }
	}
	return this.start(mapping, actionForm, request, response);
    }

    private String getReturnMethod(HttpServletRequest request) {
	return (request.getAttribute("returnMethod") != null) ? request.getAttribute("returnMethod").toString() : request
		.getParameter("returnMethod");
    }

    @Override
    public ActionForward addAnnouncement(ActionMapping mapping, ActionForm form, HttpServletRequest request,
	    HttpServletResponse response) throws Exception {
	request.setAttribute("returnMethod", "viewAnnouncements");
	return super.addAnnouncement(mapping, form, request, response);
    }

}