/*
    * 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.logging.log4j.simple;
  
  import java.io.FileNotFoundException;
  import java.io.FileOutputStream;
  import java.io.PrintStream;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.message.MessageFactory;
  import org.apache.logging.log4j.spi.AbstractLogger;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  import org.apache.logging.log4j.spi.LoggerContext;
  import org.apache.logging.log4j.spi.LoggerRegistry;
  import org.apache.logging.log4j.util.PropertiesUtil;
  
  /**
   *
   */
  public class SimpleLoggerContext implements LoggerContext {
  
      private static final String SYSTEM_OUT = "system.out";
  
      private static final String SYSTEM_ERR = "system.err";
  
      /** The default format to use when formatting dates */
      protected static final String DEFAULT_DATE_TIME_FORMAT = "yyyy/MM/dd HH:mm:ss:SSS zzz";
  
      /** All system properties used by <code>SimpleLog</code> start with this */
      protected static final String SYSTEM_PREFIX = "org.apache.logging.log4j.simplelog.";
  
      private final PropertiesUtil props;
  
      /** Include the instance name in the log message? */
      private final boolean showLogName;
  
      /**
       * Include the short name (last component) of the logger in the log message. Defaults to true - otherwise we'll be
       * lost in a flood of messages without knowing who sends them.
       */
      private final boolean showShortName;
      /** Include the current time in the log message */
      private final boolean showDateTime;
      /** Include the ThreadContextMap in the log message */
      private final boolean showContextMap;
      /** The date and time format to use in the log message */
      private final String dateTimeFormat;
  
      private final Level defaultLevel;
  
      private final PrintStream stream;
  
      private final LoggerRegistry<ExtendedLogger> loggerRegistry = new LoggerRegistry<>();
  
      public SimpleLoggerContext() {
          props = new PropertiesUtil("log4j2.simplelog.properties");
  
          showContextMap = props.getBooleanProperty(SYSTEM_PREFIX + "showContextMap", false);
          showLogName = props.getBooleanProperty(SYSTEM_PREFIX + "showlogname", false);
          showShortName = props.getBooleanProperty(SYSTEM_PREFIX + "showShortLogname", true);
          showDateTime = props.getBooleanProperty(SYSTEM_PREFIX + "showdatetime", false);
          final String lvl = props.getStringProperty(SYSTEM_PREFIX + "level");
          defaultLevel = Level.toLevel(lvl, Level.ERROR);
  
          dateTimeFormat = showDateTime ? props.getStringProperty(SimpleLoggerContext.SYSTEM_PREFIX + "dateTimeFormat",
                  DEFAULT_DATE_TIME_FORMAT) : null;
  
          final String fileName = props.getStringProperty(SYSTEM_PREFIX + "logFile", SYSTEM_ERR);
          PrintStream ps;
          if (SYSTEM_ERR.equalsIgnoreCase(fileName)) {
              ps = System.err;
          } else if (SYSTEM_OUT.equalsIgnoreCase(fileName)) {
              ps = System.out;
          } else {
              try {
                  final FileOutputStream os = new FileOutputStream(fileName);
                  ps = new PrintStream(os);
              } catch (final FileNotFoundException fnfe) {
                  ps = System.err;
              }
          }
          this.stream = ps;
      }
  
      @Override
     public ExtendedLogger getLogger(final String name) {
         return getLogger(name, null);
     }
 
     @Override
     public ExtendedLogger getLogger(final String name, final MessageFactory messageFactory) {
         // Note: This is the only method where we add entries to the 'loggerRegistry' ivar.
         final ExtendedLogger extendedLogger = loggerRegistry.getLogger(name, messageFactory);
         if (extendedLogger != null) {
             AbstractLogger.checkMessageFactory(extendedLogger, messageFactory);
             return extendedLogger;
         }
         final SimpleLogger simpleLogger = new SimpleLogger(name, defaultLevel, showLogName, showShortName, showDateTime,
                 showContextMap, dateTimeFormat, messageFactory, props, stream);
         loggerRegistry.putIfAbsent(name, messageFactory, simpleLogger);
         return loggerRegistry.getLogger(name, messageFactory);
     }
 
     @Override
     public boolean hasLogger(final String name) {
         return false;
     }
 
     @Override
     public boolean hasLogger(final String name, final MessageFactory messageFactory) {
         return false;
     }
 
     @Override
     public boolean hasLogger(final String name, final Class<? extends MessageFactory> messageFactoryClass) {
         return false;
     }
 
     @Override
     public Object getExternalContext() {
         return null;
     }
 
 }