/*
 * Copyright 2012 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package ca.grocerygo.appengine.gcm;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Servlet that adds display number of devices and button to send a message.
 * <p/>
 * This servlet is used just by the browser (i.e., not device) and contains the
 * main page of the demo app.
 */
@SuppressWarnings("serial")
public class HomeServlet extends BaseServlet {

    static final String ATTRIBUTE_STATUS = "status";

    /**
     * Displays the existing messages and offer the option to send a new one.
     */
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        resp.setContentType("text/html");
        PrintWriter out = resp.getWriter();

        out.print("<html><body>");
        out.print("<head>");
        out.print("  <title>GCM Demo</title>");
        out.print("  <link rel='icon' href='favicon.png'/>");
        out.print("</head>");
        String status = (String) req.getAttribute(ATTRIBUTE_STATUS);
        if (status != null) {
            out.print(status);
        }
        int total = Datastore.getTotalDevices();
        if (total == 0) {
            out.print("<h2>No devices registered!</h2>");
        } else {
            out.print("<h2>" + total + " device(s) registered!</h2>");
            out.print("<form name='form' method='POST' action='sendAll'>");
            out.print("<input type='submit' value='Send Message' />");
            out.print("</form>");
        }
        out.print("</body></html>");
        resp.setStatus(HttpServletResponse.SC_OK);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        doGet(req, resp);
    }

}