/*
    * Licensed under the GPL License. You may not use this file except in compliance with the License.
    * You may obtain a copy of the License at
    *
    *   https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
    *
    * THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
    * WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
    * PURPOSE.
   */
  package psiprobe.tools.logging.jdk;
  
  import java.lang.reflect.InvocationTargetException;
  import java.lang.reflect.Method;
  import java.util.ArrayList;
  import java.util.Collections;
  import java.util.Enumeration;
  import java.util.List;
  
  import org.apache.commons.lang3.reflect.MethodUtils;
  
  import psiprobe.tools.logging.DefaultAccessor;
  import psiprobe.tools.logging.LogDestination;
  
  /**
   * The Class Jdk14ManagerAccessor.
   */
  public class Jdk14ManagerAccessor extends DefaultAccessor {
  
    /**
     * Instantiates a new jdk14 manager accessor.
     *
     * @param cl the cl
     *
     * @throws ClassNotFoundException the class not found exception
     * @throws IllegalAccessException the illegal access exception
     * @throws InvocationTargetException the invocation target exception
     */
    public Jdk14ManagerAccessor(ClassLoader cl)
        throws ClassNotFoundException, IllegalAccessException, InvocationTargetException {
  
      Class<?> clazz = cl.loadClass("java.util.logging.LogManager");
      Method getManager = MethodUtils.getAccessibleMethod(clazz, "getLogManager");
      Object manager = getManager.invoke(null);
      if (manager == null) {
        throw new NullPointerException(clazz.getName() + ".getLogManager() returned null");
      }
      setTarget(manager);
    }
  
    /**
     * Gets the root logger.
     *
     * @return the root logger
     */
    public Jdk14LoggerAccessor getRootLogger() {
      return getLogger("");
    }
  
    /**
     * Gets the logger.
     *
     * @param name the name
     *
     * @return the logger
     */
    public Jdk14LoggerAccessor getLogger(String name) {
      try {
        Object logger = MethodUtils.invokeMethod(getTarget(), "getLogger", name);
        if (logger == null) {
          throw new NullPointerException(
              getTarget().getClass().getName() + "#getLogger(\"" + name + "\") returned null");
        }
        Jdk14LoggerAccessor accessor = new Jdk14LoggerAccessor();
        accessor.setTarget(logger);
        accessor.setApplication(getApplication());
        return accessor;
      } catch (Exception e) {
        logger.error("{}#getLogger('{}') failed", getTarget().getClass().getName(), name, e);
      }
      return null;
    }
  
    /**
     * Gets the handlers.
     *
     * @return the handlers
     */
    @SuppressWarnings("unchecked")
    public List<LogDestination> getHandlers() {
      List<LogDestination> allHandlers = new ArrayList<>();
      try {
        for (String name : Collections
            .list((Enumeration<String>) MethodUtils.invokeMethod(getTarget(), "getLoggerNames"))) {
          Jdk14LoggerAccessor accessor = getLogger(name);
          if (accessor != null) {
            allHandlers.addAll(accessor.getHandlers());
          }
        }
     } catch (Exception e) {
       logger.error("{}#getLoggerNames() failed", getTarget().getClass().getName(), e);
     }
     return allHandlers;
   }
 
 }