/*
 * Copyright 2012-2017 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.vm.profiler.agent.internal;

import java.util.logging.Level;
import java.util.logging.Logger;

import com.redhat.thermostat.agent.command.RequestReceiver;
import com.redhat.thermostat.common.command.Request;
import com.redhat.thermostat.common.command.Response;
import com.redhat.thermostat.common.command.Response.ResponseType;
import com.redhat.thermostat.common.utils.LoggingUtils;
import com.redhat.thermostat.vm.profiler.common.ProfileRequest;

public class ProfilerRequestReceiver implements RequestReceiver {

    private static final Logger logger = LoggingUtils.getLogger(ProfilerRequestReceiver.class);

    private static final Response OK = new Response(ResponseType.OK);
    private static final Response ERROR = new Response(ResponseType.NOK);

    private final VmProfiler profiler;

    public ProfilerRequestReceiver(VmProfiler profiler) {
        this.profiler = profiler;
    }

    @Override
    public Response receive(Request request) {
        String value = request.getParameter(ProfileRequest.PROFILE_ACTION);
        String vmId = request.getParameter(ProfileRequest.VM_ID);

        try {
            switch (value) {
            case ProfileRequest.START_PROFILING:
                return startProfiling(vmId);
            case ProfileRequest.STOP_PROFILING:
                return stopProfiling(vmId);
            default:
                logger.warning("Unknown command: '" + value + "'");
                return ERROR;
            }
        } catch (Exception e) {
            logger.log(Level.FINE, "Exception handling command", e);
            return ERROR;
        }
    }

    private Response startProfiling(String vmId) {
        logger.info("Starting profiling " + vmId);
        try {
            profiler.startProfiling(vmId);
            return OK;
        } catch (Exception e) {
            logger.log(Level.INFO, "start profiling failed", e);
            return ERROR;
        }
    }

    private Response stopProfiling(String vmId) {
        logger.info("Stopping profiling " + vmId);
        try {
            profiler.stopProfiling(vmId);
            return OK;
        } catch (Exception e) {
            logger.log(Level.INFO, "stop profiling failed", e);
            return ERROR;
        }
    }

}