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// Licensed to the Software Freedom Conservancy (SFC) under one
// or more contributor license agreements.  See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership.  The SFC 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.openqa.selenium.logging;

import com.google.common.collect.Lists;

import org.openqa.selenium.logging.LogEntry;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Handler;
import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.Logger;

/**
 * A custom handler used to record log entries.
 *
 * This handler queues up log records as they come, up to MAX_RECORDS
 * (currently 1000) records.
 * If it reaches this capacity it will remove the older records
 * from the queue before adding the next one.
 */
public class LoggingHandler extends Handler {

  private static final int MAX_RECORDS = 1000;
  private LinkedList records = Lists.newLinkedList();
  private static final LoggingHandler instance = new LoggingHandler();

  private LoggingHandler() {}

  public static LoggingHandler getInstance() {
    return instance;
  }

  /**
   *
   * @return an unmodifiable list of LogEntry.
   */
  public synchronized List getRecords() {
    return Collections.unmodifiableList(records);
  }

  @Override
  public synchronized  void publish(LogRecord logRecord) {
    if (isLoggable(logRecord)) {
      if (records.size() > MAX_RECORDS) {
        records.remove();
      }
      records.add(new LogEntry(logRecord.getLevel(),
          logRecord.getMillis(),
          logRecord.getLoggerName() + " "
              + logRecord.getSourceClassName() + "." + logRecord.getSourceMethodName()
              + " " + logRecord.getMessage()));
    }
  }

  public void attachTo(Logger logger, Level level) {
    Handler[] handlers = logger.getHandlers();
    for (Handler handler : handlers) {
      if (handler == this) {
        // the handler has already been added
        return;
      }
    }
    setLevel(level);
    logger.addHandler(this);
  }

  @Override
  public void flush() {
    records = Lists.newLinkedList();
  }

  @Override
  public synchronized void close() throws SecurityException {
    records.clear();
  }
}