/*
 * Copyright 2012 Red Hat, Inc.
 *
 * This file is part of Thermostat.
 *
 * Thermostat is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published
 * by the Free Software Foundation; either version 2, or (at your
 * option) any later version.
 *
 * Thermostat 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Thermostat; see the file COPYING.  If not see
 * <http://www.gnu.org/licenses/>.
 *
 * Linking this code with other modules is making a combined work
 * based on this code.  Thus, the terms and conditions of the GNU
 * General Public License cover the whole combination.
 *
 * As a special exception, the copyright holders of this code give
 * you permission to link this code with independent modules to
 * produce an executable, regardless of the license terms of these
 * independent modules, and to copy and distribute the resulting
 * executable under terms of your choice, provided that you also
 * meet, for each linked independent module, the terms and conditions
 * of the license of that module.  An independent module is a module
 * which is not derived from or based on this code.  If you modify
 * this code, you may extend this exception to your version of the
 * library, but you are not obligated to do so.  If you do not wish
 * to do so, delete this exception statement from your version.
 */

package com.redhat.thermostat.client.killvm.internal;

import java.net.InetSocketAddress;

import com.redhat.thermostat.client.command.RequestQueue;
import com.redhat.thermostat.client.killvm.locale.LocaleResources;
import com.redhat.thermostat.client.osgi.service.VMContextAction;
import com.redhat.thermostat.client.osgi.service.VmFilter;
import com.redhat.thermostat.common.appctx.ApplicationContext;
import com.redhat.thermostat.common.command.Request;
import com.redhat.thermostat.common.command.Request.RequestType;
import com.redhat.thermostat.common.command.RequestResponseListener;
import com.redhat.thermostat.common.dao.DAOFactory;
import com.redhat.thermostat.common.dao.VmRef;
import com.redhat.thermostat.common.locale.Translate;
import com.redhat.thermostat.common.model.VmInfo;
import com.redhat.thermostat.common.utils.OSGIUtils;

/**
 * Implements the {@link VMContextAction} entry point to provide a kill switch
 * for the currently selected Virtual Machine. 
 */
public class KillVMAction implements VMContextAction {

    private static final String RECEIVER = "com.redhat.thermostat.agent.killvm.internal.KillVmReceiver";
    private final DAOFactory dao;
    private final Translate t;
    private final RequestResponseListener listener;

    public KillVMAction(RequestResponseListener listener) {
        if (listener == null) {
            throw new IllegalArgumentException("Listener can't be null");
        }
        this.dao = ApplicationContext.getInstance().getDAOFactory();
        this.t = LocaleResources.createLocalizer();
        this.listener = listener;
    }

    @Override
    public String getName() {
        return t.localize(LocaleResources.ACTION_NAME);
    }

    @Override
    public String getDescription() {
        return t.localize(LocaleResources.ACTION_DESCRIPTION);
    }

    @Override
    public void execute(VmRef reference) {
        String address = dao.getAgentInfoDAO().getAgentInformation(reference.getAgent()).getConfigListenAddress();
        
        String [] host = address.split(":");
        InetSocketAddress target = new InetSocketAddress(host[0], Integer.parseInt(host[1]));
        Request murderer = getKillRequest(target);
        murderer.setParameter("vm-id", reference.getIdString());
        murderer.setReceiver(RECEIVER);
        murderer.addListener(listener);

        RequestQueue queue = OSGIUtils.getInstance().getService(RequestQueue.class);
        queue.putRequest(murderer);
    }

    // testing hook; keep this package private
    Request getKillRequest(InetSocketAddress target) {
        return new Request(RequestType.RESPONSE_EXPECTED, target);
    }

    @Override
    public VmFilter getFilter() {
        return new LocalAndAliveFilter();
    }

    private class LocalAndAliveFilter implements VmFilter {

        @Override
        public boolean matches(VmRef ref) {
            VmInfo vmInfo = dao.getVmInfoDAO().getVmInfo(ref);
            return vmInfo.isAlive();
        }

    }
}