/*
 * Copyright (C) 2010 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.exoplatform.portal.mop.user;

import org.exoplatform.portal.config.UserACL;
import org.exoplatform.portal.mop.Visibility;
import org.exoplatform.portal.mop.navigation.NodeFilter;
import org.exoplatform.portal.mop.navigation.NodeState;
import org.exoplatform.portal.mop.page.PageContext;
import org.exoplatform.portal.mop.page.PageKey;

/**
 * @author <a href="mailto:julien.viet@exoplatform.com">Julien Viet</a>
 * @version $Revision$
 */
class UserNodeFilter implements NodeFilter {

    /** . */
    private final UserPortalImpl userPortal;

    /** . */
    private final UserNodeFilterConfig config;

    public UserNodeFilter(UserPortalImpl userPortal, UserNodeFilterConfig config) {
        if (userPortal == null) {
            throw new NullPointerException();
        }
        if (config == null) {
            throw new NullPointerException();
        }

        //
        this.userPortal = userPortal;
        this.config = config;
    }

    private boolean canRead(NodeState state) {
        PageKey pageRef = state.getPageRef();
        if (pageRef != null) {
            try {
                PageContext page = userPortal.service.getPageService().loadPage(pageRef);
                if (page != null) {
                    return userPortal.service.getUserACL().hasPermission(page);
                }
            } catch (Exception ignore) {
            }
        }
        return true;
    }

    private boolean canWrite(NodeState state) {
        PageKey pageRef = state.getPageRef();
        if (pageRef != null) {
            try {
                PageContext page = userPortal.service.getPageService().loadPage(pageRef);
                if (page != null) {
                    return userPortal.service.getUserACL().hasEditPermission(page);
                }
            } catch (Exception ignore) {
            }
        }
        return false;
    }

    public boolean accept(int depth, String id, String name, NodeState state) {
        Visibility visibility = state.getVisibility();

        // Correct null -> displayed
        if (visibility == null) {
            visibility = Visibility.DISPLAYED;
        }

        // If a visibility is specified then we use it
        if (config.visibility != null && !config.visibility.contains(visibility)) {
            return false;
        }

        // Filter by path
        if (depth > 0 && config.path != null && (depth - 1 >= config.path.length || !config.path[depth - 1].equals(name))) {
            return false;
        }

        //
        UserACL acl = userPortal.service.getUserACL();

        // Perform authorization check
        if (config.authorizationMode == UserNodeFilterConfig.AUTH_NO_CHECK) {
            // Do nothing here
        } else {
            if (visibility == Visibility.SYSTEM) {
                if (config.authorizationMode == UserNodeFilterConfig.AUTH_READ_WRITE) {
                    if (!canWrite(state)) {
                        return false;
                    }
                } else {
                    if (!canRead(state)) {
                        return false;
                    }
                }
            } else {
                if (config.authorizationMode == UserNodeFilterConfig.AUTH_READ_WRITE) {
                    if (!canRead(state)) {
                        return false;
                    }
                } else {
                    if (!canRead(state)) {
                        return false;
                    }
                }
            }
        }

        // Now make the custom checks
        switch (visibility) {
            case SYSTEM:
                break;
            case TEMPORAL:
                if (config.temporalCheck) {
                    long now = System.currentTimeMillis();
                    if (state.getStartPublicationTime() != -1 && now < state.getStartPublicationTime()) {
                        return false;
                    }
                    if (state.getEndPublicationTime() != -1 && now > state.getEndPublicationTime()) {
                        return false;
                    }
                }
                break;
        }

        //
        return true;
    }
}
