/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.jdo.tck.util;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.util.logging.ErrorManager;
import java.util.logging.Filter;
import java.util.logging.Formatter;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogManager;
import java.util.logging.LogRecord;
import java.util.logging.SimpleFormatter;
import java.util.logging.StreamHandler;

/**
 * A JDK1.4 logging Handler class which delegates to a file handler. Configuration: By default each
 * TCKFileHandler is initialized using the following LogManager configuration properties:
 *
 * <ul>
 *   <li>java.util.logging.TCKFileHandler.level specifies the default level for the Handler
 *       (defaults to Level.ALL).
 *   <li>java.util.logging.FileHandler.filter specifies the name of a Filter class to use (defaults
 *       to no Filter).
 *   <li>java.util.logging.FileHandler.formatter specifies the name of a Formatter class to use
 *       (defaults to java.util.logging.SimpleFormatter).
 *   <li>java.util.logging.FileHandler.encoding the name of the character set encoding to use
 *       (defaults to the default platform encoding).
 *   <li>java.util.logging.FileHandler.fileName specifies a the output file name. See below for
 *       details.
 *   <li>java.util.logging.FileHandler.append specifies whether the FileHandler should append onto
 *       any existing files (defaults to false).
 * </ul>
 *
 * For details on the construction of the file name see method {@link
 * BatchTestRunner#changeFileName(String)}.
 */
public class TCKFileHandler extends Handler {

  private static final String defaultName = "";
  private static final boolean defaultAppend = false;
  private static final Level defaultLevel = Level.ALL;
  private static final Filter defaultFilter = null;
  private static final Formatter defaultFormatter = new SimpleFormatter();
  private static final String defaultEncoding = null;

  private String fileName;
  private boolean append;

  private Level level;
  private Filter filter;
  private Formatter formatter;
  private String encoding;

  private FileHandlerDelegate delegate;

  /**
   * @see Handler#Handler()
   * @throws IOException IO exception
   * @throws SecurityException securiyt exception
   */
  public TCKFileHandler() throws IOException, SecurityException {
    configure();

    this.delegate = new FileHandlerDelegate();

    OutputStream stream = new FileOutputStream(this.fileName, this.append);
    this.delegate.setOutputStream(stream);

    this.delegate.setLevel(this.level);
    this.delegate.setFilter(this.filter);
    this.delegate.setFormatter(this.formatter);
    this.delegate.setEncoding(this.encoding);
  }

  /**
   * @see Handler#publish(java.util.logging.LogRecord)
   */
  public synchronized void publish(LogRecord record) {
    this.delegate.publish(record);
  }

  /**
   * @see Handler#close()
   */
  public synchronized void close() throws SecurityException {
    this.delegate.close();
  }

  /**
   * @see Handler#flush()
   */
  public void flush() {
    this.delegate.flush();
  }

  /**
   * @see Handler#getEncoding()
   */
  @Override
  public String getEncoding() {
    return this.encoding;
  }

  /**
   * @see Handler#getErrorManager()
   */
  @Override
  public ErrorManager getErrorManager() {
    return this.delegate.getErrorManager();
  }

  /**
   * @see Handler#getFilter()
   */
  @Override
  public Filter getFilter() {
    return this.filter;
  }

  /**
   * @see Handler#getFormatter()
   */
  @Override
  public Formatter getFormatter() {
    return this.formatter;
  }

  /**
   * @see Handler#getLevel()
   */
  @Override
  public Level getLevel() {
    return this.level;
  }

  /**
   * @see Handler#reportError(java.lang.String, java.lang.Exception, int)
   */
  @Override
  protected void reportError(String msg, Exception ex, int code) {
    this.delegate.reportError(msg, ex, code);
  }

  /**
   * @see Handler#setErrorManager(java.util.logging.ErrorManager)
   */
  @Override
  public void setErrorManager(ErrorManager em) {
    this.delegate.setErrorManager(em);
  }

  /**
   * @see StreamHandler#isLoggable(java.util.logging.LogRecord)
   */
  @Override
  public boolean isLoggable(LogRecord record) {
    return this.delegate.isLoggable(record);
  }

  /**
   * Sets the file name fileName property.
   *
   * @param fileName The fileName to set
   */
  protected void setPattern(String fileName) {
    this.fileName = BatchTestRunner.changeFileName(fileName);
  }

  /**
   * Sets the append property.
   *
   * @param append The append to set.
   */
  protected void setAppend(boolean append) {
    this.append = append;
  }

  /**
   * Sets the level property.
   *
   * @param level The level to set.
   */
  @Override
  public void setLevel(Level level) {
    this.level = level;
    if (this.delegate != null) {
      this.delegate.setLevel(level);
    }
  }

  /**
   * Sets the filter property.
   *
   * @param filter The filter to set.
   */
  @Override
  public void setFilter(Filter filter) {
    this.filter = filter;
    if (this.delegate != null) {
      this.delegate.setFilter(filter);
    }
  }

  /**
   * Sets the formatter property.
   *
   * @param formatter The formatter to set.
   */
  @Override
  public void setFormatter(Formatter formatter) {
    this.formatter = formatter;
    if (this.delegate != null) {
      this.delegate.setFormatter(formatter);
    }
  }

  /**
   * Sets the encoding property.
   *
   * @param encoding The encoding to set.
   * @throws UnsupportedEncodingException encoding not supported
   * @throws SecurityException security exception
   */
  @Override
  public void setEncoding(String encoding) throws SecurityException, UnsupportedEncodingException {
    this.encoding = encoding;
    if (this.delegate != null) {
      this.delegate.setEncoding(encoding);
    }
  }

  /**
   * Sets the delegate.
   *
   * @param delegate The delegate to set.
   */
  protected void setDelegate(FileHandlerDelegate delegate) {
    this.delegate = delegate;
  }

  private void configure() {
    LogManager manager = LogManager.getLogManager();
    String className = this.getClass().getName();

    setPattern(getStringProperty(manager, className + ".fileName", defaultName));
    setAppend(getBooleanProperty(manager, className + ".append", defaultAppend));

    setLevel(getLevelProperty(manager, className + ".level", defaultLevel));
    setFilter(getFilterProperty(manager, className + ".filter", defaultFilter));
    setFormatter(getFormatterProperty(manager, className + ".formatter", defaultFormatter));
    try {
      setEncoding(getStringProperty(manager, className + ".encoding", defaultEncoding));
    } catch (Exception e) {
      try {
        setEncoding(defaultEncoding);
      } catch (Exception ignored) {
      }
    }
  }

  private boolean getBooleanProperty(LogManager manager, String property, boolean defaultValue) {
    boolean result = defaultValue;
    String value = manager.getProperty(property);
    if (value != null) {
      try {
        result = Boolean.valueOf(value.trim()).booleanValue();
      } catch (Exception ignored) {
      }
    }
    return result;
  }

  private String getStringProperty(LogManager manager, String property, String defaultValue) {
    String result = defaultValue;
    String value = manager.getProperty(property);
    if (value != null) {
      result = value.trim();
    }
    return result;
  }

  private Level getLevelProperty(LogManager manager, String property, Level defaultValue) {
    Level result = defaultValue;
    String value = manager.getProperty(property);
    if (value != null) {
      try {
        result = Level.parse(value.trim());
      } catch (Exception ignored) {
      }
    }
    return result;
  }

  private Filter getFilterProperty(LogManager manager, String property, Filter defaultValue) {
    return (Filter) newInstanceForProperty(manager, property, defaultValue);
  }

  private Formatter getFormatterProperty(
      LogManager manager, String property, Formatter defaultValue) {
    return (Formatter) newInstanceForProperty(manager, property, defaultValue);
  }

  private Object newInstanceForProperty(LogManager manager, String property, Object defaultValue) {
    Object result = defaultValue;
    String value = manager.getProperty(property);
    if (value != null) {
      try {
        Class<?> clazz = ClassLoader.getSystemClassLoader().loadClass(value);
        result = clazz.getDeclaredConstructor().newInstance();
      } catch (Exception ignored) {
      }
    }
    return result;
  }

  /**
   * This class has been defined to make method {@link Handler#reportError(java.lang.String,
   * java.lang.Exception, int)} accessible in the outer class.
   */
  private static class FileHandlerDelegate extends StreamHandler {

    @Override
    protected void setOutputStream(OutputStream out) {
      super.setOutputStream(out);
    }

    /**
     * @see Handler#reportError(java.lang.String, java.lang.Exception, int)
     */
    @Override
    protected void reportError(String msg, Exception ex, int code) {
      super.reportError(msg, ex, code);
    }
  }
}