/*
  Proto - Ein Rumpf-Konstrukt fuer Webapps 
  Copyright (C) 2021  Ulrich Hilger

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU Affero General Public License as
  published by the Free Software Foundation, either version 3 of the
  License, or (at your option) any later version.

  This program 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 Affero General Public License for more details.

  You should have received a copy of the GNU Affero General Public License
  along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
package de.uhilger.proto;

import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import static de.uhilger.proto.App.RB_NAME;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ResourceBundle;
import java.util.Timer;
import java.util.TimerTask;
import java.util.logging.Logger;

/**
 * Ein HTTP-Handler zum Stoppen der Anwendung
 *
 * @author Ulrich Hilger
 */
public class StopServerHandler implements HttpHandler {
  
  public static final String RB_SERVER_STOPPED_MSG = "msgServerStopped";
  public static final String RB_STOPPING_SERVER_MSG = "msgStoppingServer";
  public static final String RB_APP_ENDED_MSG = "msgAppEnded";

  /**
   * Den Server geordnet herunterfahren und 
   * dann die Anwendung beenden.
   * 
   * @param e das Objekt mit Methoden zur Untersuchung der Anfrage sowie zum
   * Anfertigen und Senden der Antwort
   * @throws IOException falls etwas schief geht entsteht dieser Fehler
   */
  @Override
  public void handle(HttpExchange e) throws IOException {
    Logger.getLogger(StopServerHandler.class.getName()).info(e.getRequestURI().toString());
    ResourceBundle rb = ResourceBundle.getBundle(RB_NAME);

    String response = rb.getString(RB_SERVER_STOPPED_MSG); //"Server stopped";
    e.sendResponseHeaders(200, response.length());
    OutputStream os = e.getResponseBody();
    os.write(response.getBytes());
    os.flush();
    os.close();
    Logger.getLogger(StopServerHandler.class.getName()).info(rb.getString(RB_STOPPING_SERVER_MSG));
    e.getHttpContext().getServer().stop(1);
    Timer timer = new Timer();
    timer.schedule(new AppStopper(), 2000);
  }

  /**
   * Die Klasse AppStopper erm&ouml;glicht das asnychrone bzw. 
   * zeitgesteuerte Stoppen der Anwendung.
   */
  class AppStopper extends TimerTask {

    @Override
    public void run() {
      ResourceBundle rb = ResourceBundle.getBundle(RB_NAME);
      Logger.getLogger(StopServerHandler.class.getName()).info(rb.getString(RB_APP_ENDED_MSG));
      System.exit(0);
    }
  }

}