/*
 * 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.juneau.microservice.tomcat;

import static java.util.logging.Level.*;
import static org.apache.juneau.commons.utils.Shorts.*;

import java.util.logging.*;

import org.apache.juli.logging.*;

/**
 * Implementation of the embedded-Tomcat {@link Log} façade based on {@link Logger}.
 *
 * <p>
 * Allows Tomcat to log to the Java Util logging framework (and thus to the main log file defined in the
 * <cc>[Logging]</cc> section), mirroring the role of
 * {@code org.apache.juneau.marshall.microservice.jetty.JettyLogger} in the Jetty module.
 *
 * <p>
 * Tomcat log levels map to {@link Level} values as follows: <c>trace</c>&rarr;{@link Level#FINEST FINEST},
 * <c>debug</c>&rarr;{@link Level#FINE FINE}, <c>info</c>&rarr;{@link Level#INFO INFO},
 * <c>warn</c>&rarr;{@link Level#WARNING WARNING}, and <c>error</c>/<c>fatal</c>&rarr;{@link Level#SEVERE SEVERE}.
 *
 * <h5 class='section'>See Also:</h5><ul>
 *    <li class='link'><a class="doclink" href="https://juneau.apache.org/docs/topics/JuneauMicroserviceTomcat">juneau-microservice-tomcat</a>
 * </ul>
 *
 * @since 10.0.0
 */
public class TomcatLogger implements Log {

   private final Logger logger;

   /**
    * Default constructor.
    *
    * <p>
    * Returns the logger with name <js>"org.apache.juneau.marshall.microservice.tomcat"</js>.
    */
   public TomcatLogger() {
      this("org.apache.juneau.marshall.microservice.tomcat");
   }

   /**
    * Normal constructor.
    *
    * @param name The logger name.  Must not be <jk>null</jk>.
    */
   public TomcatLogger(String name) {
      logger = Logger.getLogger(name);
   }

   /**
    * Returns the name of the underlying Java Util logger.
    *
    * @return The logger name.
    */
   public String getName() {
      return logger.getName();
   }

   @Override /* Overridden from Log */
   public boolean isTraceEnabled() {
      return logger.isLoggable(FINEST);
   }

   @Override /* Overridden from Log */
   public boolean isDebugEnabled() {
      return logger.isLoggable(FINE);
   }

   @Override /* Overridden from Log */
   public boolean isInfoEnabled() {
      return logger.isLoggable(INFO);
   }

   @Override /* Overridden from Log */
   public boolean isWarnEnabled() {
      return logger.isLoggable(WARNING);
   }

   @Override /* Overridden from Log */
   public boolean isErrorEnabled() {
      return logger.isLoggable(SEVERE);
   }

   @Override /* Overridden from Log */
   public boolean isFatalEnabled() {
      return logger.isLoggable(SEVERE);
   }

   @Override /* Overridden from Log */
   public void trace(Object message) {
      log(FINEST, message, null);
   }

   @Override /* Overridden from Log */
   public void trace(Object message, Throwable t) {
      log(FINEST, message, t);
   }

   @Override /* Overridden from Log */
   public void debug(Object message) {
      log(FINE, message, null);
   }

   @Override /* Overridden from Log */
   public void debug(Object message, Throwable t) {
      log(FINE, message, t);
   }

   @Override /* Overridden from Log */
   public void info(Object message) {
      log(INFO, message, null);
   }

   @Override /* Overridden from Log */
   public void info(Object message, Throwable t) {
      log(INFO, message, t);
   }

   @Override /* Overridden from Log */
   public void warn(Object message) {
      log(WARNING, message, null);
   }

   @Override /* Overridden from Log */
   public void warn(Object message, Throwable t) {
      log(WARNING, message, t);
   }

   @Override /* Overridden from Log */
   public void error(Object message) {
      log(SEVERE, message, null);
   }

   @Override /* Overridden from Log */
   public void error(Object message, Throwable t) {
      log(SEVERE, message, t);
   }

   @Override /* Overridden from Log */
   public void fatal(Object message) {
      log(SEVERE, message, null);
   }

   @Override /* Overridden from Log */
   public void fatal(Object message, Throwable t) {
      log(SEVERE, message, t);
   }

   /**
    * Internal log method that creates a {@link LogRecord} and logs it through the underlying Java Util logger.
    *
    * @param level The log level.
    * @param message The log message (its {@code toString()} is used; {@code null} is rendered as an empty string).
    * @param thrown The throwable to log, or <jk>null</jk> if none.
    */
   private void log(Level level, Object message, Throwable thrown) {
      if (! logger.isLoggable(level))
         return;
      var r = new LogRecord(level, message == null ? "" : message.toString());
      if (nn(thrown))
         r.setThrown(thrown);
      r.setLoggerName(logger.getName());
      logger.log(r);
   }
}