/**
 * Logback: the reliable, generic, fast and flexible logging framework.
 * Copyright (C) 1999-2013, QOS.ch. All rights reserved.
 *
 * This program and the accompanying materials are dual-licensed under
 * either the terms of the Eclipse Public License v1.0 as published by
 * the Eclipse Foundation
 *
 *   or (per the licensee's choosing)
 *
 * under the terms of the GNU Lesser General Public License version 2.1
 * as published by the Free Software Foundation.
 */
package ch.qos.logback.classic.selector.servlet;

import static ch.qos.logback.classic.ClassicConstants.JNDI_CONTEXT_NAME;

import javax.naming.Context;
import javax.naming.NamingException;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

import org.slf4j.Logger;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.selector.ContextSelector;
import ch.qos.logback.classic.util.ContextSelectorStaticBinder;
import ch.qos.logback.classic.util.JNDIUtil;

public class ContextDetachingSCL implements ServletContextListener {

  public void contextDestroyed(ServletContextEvent servletContextEvent) {
    String loggerContextName = null;
    
    try {
      Context ctx = JNDIUtil.getInitialContext();
      loggerContextName = (String) JNDIUtil.lookup(ctx, JNDI_CONTEXT_NAME);
    } catch (NamingException ne) {
    }
    
    ContextSelector selector = ContextSelectorStaticBinder.getSingleton().getContextSelector();
    if(selector == null) {
      System.out.println("Selector is null, cannot detach context. Skipping.");
      return;
    }
    
    LoggerContext context;
    if (loggerContextName == null) {
      System.out.println("About to detach default context");
      context = selector.getDefaultLoggerContext();
      loggerContextName = context.getName();
    } else {
      System.out.println("About to detach context named " + loggerContextName);
      context = selector.getLoggerContext(loggerContextName);
    }
    
    if (context != null) {
      Logger logger = context.getLogger(Logger.ROOT_LOGGER_NAME);
      logger.warn("Stopping logger context " + loggerContextName);
      selector.detachLoggerContext(loggerContextName);
      // when the web-app is destroyed, its logger context should be stopped
      context.stop();
    } else {
      System.out.println("No context named " + loggerContextName + " was found.");
    }
  }

  public void contextInitialized(ServletContextEvent arg0) {
    // do nothing
  }

}