/*
 * This library is part of OpenCms -
 * the Open Source Content Management System
 *
 * Copyright (c) Alkacon Software GmbH (http://www.alkacon.com)
 *
 * This library 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 library 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.
 *
 * For further information about Alkacon Software, please see the
 * company website: http://www.alkacon.com
 *
 * For further information about OpenCms, please see the
 * project website: http://www.opencms.org
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.opencms.ade.sitemap.client.toolbar;

import org.opencms.ade.sitemap.client.control.CmsSitemapController;
import org.opencms.gwt.client.CmsCoreProvider;
import org.opencms.gwt.client.rpc.CmsRpcAction;
import org.opencms.gwt.client.ui.CmsAlertDialog;
import org.opencms.gwt.client.ui.CmsPushButton;
import org.opencms.gwt.client.ui.I_CmsButton;
import org.opencms.gwt.client.ui.I_CmsButton.ButtonStyle;
import org.opencms.gwt.client.util.CmsDomUtil;
import org.opencms.gwt.client.util.CmsMessages;
import org.opencms.gwt.shared.CmsReturnLinkInfo;
import org.opencms.util.CmsStringUtil;

import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.Window;

/**
 * The toolbar button for jumping to the last visited container page.<p>
 * 
 * @since 8.0.0
 */
public class CmsToolbarGoBackButton extends CmsPushButton {

    /** The return code. */
    private String m_returnCode;

    /**
     * Constructor.<p>
     * 
     * @param toolbar the toolbar instance
     * @param controller the sitemap controller 
     */
    public CmsToolbarGoBackButton(final CmsSitemapToolbar toolbar, final CmsSitemapController controller) {

        setImageClass(I_CmsButton.ButtonData.BACK.getIconClass());
        setTitle(I_CmsButton.ButtonData.BACK.getTitle());
        setButtonStyle(ButtonStyle.IMAGE, null);
        addClickHandler(new ClickHandler() {

            /**
             * @see com.google.gwt.event.dom.client.ClickHandler#onClick(com.google.gwt.event.dom.client.ClickEvent)
             */
            public void onClick(ClickEvent event) {

                toolbar.onButtonActivation(CmsToolbarGoBackButton.this);
                CmsDomUtil.ensureMouseOut(getElement());
                setDown(false);
                setEnabled(false);
                goBack();
            }
        });
        m_returnCode = controller.getData().getReturnCode();
    }

    /**
     * Returns the return code.<p>
     * 
     * @return the return code
     */
    protected String getReturnCode() {

        return m_returnCode;
    }

    /**
     * Opens the publish dialog without changes check.<p>
     */
    protected void goBack() {

        if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(getReturnCode())) {
            CmsRpcAction<CmsReturnLinkInfo> goBackAction = new CmsRpcAction<CmsReturnLinkInfo>() {

                @Override
                public void execute() {

                    start(300, false);
                    CmsCoreProvider.getService().getLinkForReturnCode(getReturnCode(), this);
                }

                @Override
                protected void onResponse(CmsReturnLinkInfo result) {

                    stop(false);
                    if (result.getStatus() == CmsReturnLinkInfo.Status.ok) {
                        Window.Location.assign(result.getLink());
                    } else if (result.getStatus() == CmsReturnLinkInfo.Status.notfound) {
                        CmsMessages msg = org.opencms.ade.sitemap.client.Messages.get();
                        String title = msg.key(org.opencms.ade.sitemap.client.Messages.GUI_RETURN_PAGE_NOT_FOUND_TITLE_0);
                        String content = msg.key(org.opencms.ade.sitemap.client.Messages.GUI_RETURN_PAGE_NOT_FOUND_TEXT_0);
                        CmsAlertDialog alert = new CmsAlertDialog(title, content);
                        alert.center();
                    }
                }
            };

            goBackAction.execute();

        }

    }
}