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/*
 * 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.log4j;

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;

/**
 * The Class Log4JManagerAccessor.
 */
public class Log4JManagerAccessor extends DefaultAccessor {

  /**
   * Instantiates a new log4 j manager accessor.
   *
   * @param cl the cl
   *
   * @throws ClassNotFoundException the class not found exception
   */
  public Log4JManagerAccessor(ClassLoader cl) throws ClassNotFoundException {
    Class clazz = cl.loadClass("org.apache.log4j.LogManager");
    Method exists = MethodUtils.getAccessibleMethod(clazz, "exists", String.class);
    if (exists == null) {
      throw new RuntimeException("The LogManager is part of the slf4j bridge.");
    }
    setTarget(clazz);
  }

  /**
   * Gets the root logger.
   *
   * @return the root logger
   */
  public Log4JLoggerAccessor getRootLogger() {
    try {
      Class clazz = (Class) getTarget();
      Method getRootLogger = MethodUtils.getAccessibleMethod(clazz, "getRootLogger");

      Object logger = getRootLogger.invoke(null);
      if (logger == null) {
        throw new NullPointerException(
            getTarget().getClass().getName() + "#getRootLogger() returned null");
      }
      Log4JLoggerAccessor accessor = new Log4JLoggerAccessor();
      accessor.setTarget(logger);
      accessor.setApplication(getApplication());
      return accessor;
    } catch (Exception e) {
      logger.error("{}#getRootLogger() failed", getTarget().getClass().getName(), e);
    }
    return null;
  }

  /**
   * Gets the logger.
   *
   * @param name the name
   *
   * @return the logger
   */
  public Log4JLoggerAccessor getLogger(String name) {
    try {
      Class clazz = (Class) getTarget();
      Method getLogger = MethodUtils.getAccessibleMethod(clazz, "getLogger", String.class);

      Object logger = getLogger.invoke(null, name);
      if (logger == null) {
        throw new NullPointerException(
            getTarget().getClass().getName() + "#getLogger(\"" + name + "\") returned null");
      }
      Log4JLoggerAccessor accessor = new Log4JLoggerAccessor();
      accessor.setTarget(logger);
      accessor.setApplication(getApplication());
      return accessor;
    } catch (Exception e) {
      logger.error("{}#getLogger('{}') failed", getTarget().getClass().getName(), name, e);
    }
    return null;
  }

  /**
   * Gets the appenders.
   *
   * @return the appenders
   */
  @SuppressWarnings("unchecked")
  public List getAppenders() {
    List appenders = new ArrayList<>();
    try {
      appenders.addAll(getRootLogger().getAppenders());

      Class clazz = (Class) getTarget();
      Method getCurrentLoggers = MethodUtils.getAccessibleMethod(clazz, "getCurrentLoggers");

      for (Object currentLogger : Collections
          .list((Enumeration