/*
 * Copyright (c) 2010-2012 Grid Dynamics Consulting Services, Inc, All Rights Reserved
 * http://www.griddynamics.com
 *
 * This library is free software; you can redistribute it and/or modify it under the terms of
 * the Apache License; either
 * version 2.0 of the License, or any later version.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.griddynamics.jagger.coordinator.http.server;

import com.griddynamics.jagger.coordinator.http.Ack;
import com.griddynamics.jagger.coordinator.http.RegistrationPack;
import com.griddynamics.jagger.util.SerializationUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Required;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Registers node using http protocol.
 *
 * @author Mairbek Khadikov
 */
public class RegistrationServlet extends HttpServlet {
    private static final Logger log = LoggerFactory.getLogger(RegistrationServlet.class);
    private static final String PARAM = "message";

    private TransportHandler transportHandler;

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        log.debug("Agent registration requested");

        try {
            RegistrationPack registrationPack = SerializationUtils.fromString(req.getParameter(PARAM));

            transportHandler.registerNode(registrationPack.getNode(), registrationPack.getQualifiers());

            sendAck(resp, Ack.SUCCESS);
            log.debug("Agent registration completed");
        } catch (Throwable e) {
            log.warn("Exception during agent registration", e);
            sendAck(resp, Ack.FAIL);
        }


    }

    private void sendAck(HttpServletResponse resp, Ack status) {
        ServletUtil.sendResponseObject(resp, status);
    }

    @Required
    public void setTransportHandler(TransportHandler transportHandler) {
        this.transportHandler = transportHandler;
    }
}