/**
 * Copyright (c) 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.channel.manage;

import com.redhat.rhn.common.db.datasource.DataResult;
import com.redhat.rhn.common.security.PermissionException;
import com.redhat.rhn.domain.channel.Channel;
import com.redhat.rhn.domain.channel.ChannelFactory;
import com.redhat.rhn.domain.rhnset.RhnSet;
import com.redhat.rhn.domain.role.RoleFactory;
import com.redhat.rhn.domain.user.User;
import com.redhat.rhn.frontend.struts.RequestContext;
import com.redhat.rhn.frontend.struts.RhnHelper;
import com.redhat.rhn.frontend.taglibs.list.ListTagHelper;
import com.redhat.rhn.frontend.xmlrpc.PermissionCheckFailureException;
import com.redhat.rhn.manager.channel.ChannelManager;
import com.redhat.rhn.manager.errata.cache.ErrataCacheManager;
import com.redhat.rhn.manager.rhnpackage.PackageManager;
import com.redhat.rhn.manager.rhnset.RhnSetDecl;
import com.redhat.rhn.manager.rhnset.RhnSetManager;
import com.redhat.rhn.manager.user.UserManager;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionMessage;
import org.apache.struts.action.ActionMessages;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

/**
 * ChannelPackagesAction
 */
public class ChannelPackagesCompareMergeConfirmAction extends ChannelPackagesCompareAction {

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

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

        long cid = requestContext.getRequiredParam(RequestContext.CID);
        Channel chan = ChannelFactory.lookupByIdAndUser(cid, user);

        if (!UserManager.verifyChannelAdmin(user, chan)) {
              throw new PermissionException(RoleFactory.CHANNEL_ADMIN);
        }
        if (chan.getOrg() == null) {
            throw new PermissionCheckFailureException();
        }

        RhnSet set = RhnSetDecl.PACKAGES_TO_SYNC_CHANNEL.get(user);
        DataResult result = PackageManager.mergePackagesFromSet(user, set.getLabel());


        request.setAttribute(RequestContext.CID, chan.getId());
        request.setAttribute(CHANNEL_NAME, chan.getName());
        request.setAttribute(ListTagHelper.PARENT_URL, request.getRequestURI());
        request.setAttribute(RequestContext.PAGE_LIST, result);

        int setSize = set.size();
        if (requestContext.isSubmitted() && setSize > 0) {
            mergePackages(user, chan, set);
            ActionMessages msg = new ActionMessages();
            String[] actionParams = {String.valueOf(setSize),
                                     "<strong>" + chan.getName() + "</strong>"};
            msg.add(ActionMessages.GLOBAL_MESSAGE,
                    new ActionMessage("channel.jsp.package.mergesuccess",
                            actionParams));

            getStrutsDelegate().saveMessages(requestContext.getRequest(), msg);

            // Clear the set of packages to add. This way, if the user presses the
            // back button, when trying to double-add, the set will be empty and
            // the user will be forced to select from the correct list of packages
            // that may be added.
            set.clear();
            RhnSetManager.store(set);

            Map<String, Object> params = new HashMap<String, Object>();
            params.put(RequestContext.CID, cid);
            return getStrutsDelegate().forwardParams(mapping.findForward("complete"),
                    params);

        }
        return mapping.findForward(RhnHelper.DEFAULT_FORWARD);

    }

    private void mergePackages(User user, Channel chan, RhnSet set) {
        PackageManager.mergeChannelPackagesFromSet(user, chan.getId(), set);
        chan = (Channel) ChannelFactory.reload(chan);
        List<Long> chanList = new ArrayList<Long>();
        List<Long> packList = new ArrayList<Long>();
        chanList.add(chan.getId());
        packList.addAll(set.getElementValues());
        ErrataCacheManager.insertCacheForChannelPackagesAsync(chanList, packList);
        ChannelManager.refreshWithNewestPackages(chan, "web.channel_package_compare");
        set.clear();
    }

}