/**
 * Copyright (c) 2009--2014 Red Hat, Inc.
 *
 * This software is licensed to you under the GNU General Public License,
 * version 2 (GPLv2). There is NO WARRANTY for this software, express or
 * implied, including the implied warranties of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. You should have received a copy of GPLv2
 * along with this software; if not, see
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
 *
 * Red Hat trademarks are not licensed under GPLv2. No permission is
 * granted to use or replicate Red Hat trademarks that are incorporated
 * in this software or its documentation.
 */
package com.redhat.rhn.frontend.action.rhnpackage;

import com.redhat.rhn.common.security.PermissionException;
import com.redhat.rhn.domain.rhnpackage.Package;
import com.redhat.rhn.domain.rhnpackage.PackageFactory;
import com.redhat.rhn.domain.user.User;
import com.redhat.rhn.frontend.struts.RequestContext;
import com.redhat.rhn.frontend.struts.RhnAction;
import com.redhat.rhn.frontend.struts.RhnHelper;
import com.redhat.rhn.manager.rhnpackage.PackageManager;

import org.apache.commons.lang.StringEscapeUtils;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

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

/**
 * ChannelPackagesAction
 * @version $Rev$
 */
public class PackageChangeLogAction extends RhnAction {



    /** {@inheritDoc} */
    @Override
    public ActionForward execute(ActionMapping mapping,
            ActionForm formIn,
            HttpServletRequest request,
            HttpServletResponse response) {

        RequestContext requestContext = new RequestContext(request);
        User user = requestContext.getCurrentUser();

        long pid = requestContext.getRequiredParam("pid");
        Package pkg = PackageFactory.lookupByIdAndUser(pid, user);

        // show permission error if pid is invalid like we did before
        if (pkg == null) {
            throw new PermissionException("Invalid pid");
        }

        String changelog =  PackageManager.getPackageChangeLog(pkg);
        if (changelog == null) {
            request.setAttribute("changelog", null);
        }
        else {
            changelog = StringEscapeUtils.escapeHtml(changelog);
            String[] changes = changelog.split("\n");
            request.setAttribute("changelog", changes);
        }

        request.setAttribute("pid", pid);
        request.setAttribute("package_name", pkg.getFilename());
        return mapping.findForward(RhnHelper.DEFAULT_FORWARD);

    }
}