/*
    * 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.core.pattern;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  
  import java.util.EnumMap;
  import java.util.Locale;
  
  
  /**
   * Returns the event's level in a StringBuffer.
   */
  @Plugin(name = "LevelPatternConverter", type = "Converter")
  @ConverterKeys({"p", "level" })
  public final class LevelPatternConverter extends LogEventPatternConverter {
      /**
       * Singleton.
       */
      private static final LevelPatternConverter INSTANCE = new LevelPatternConverter(null);
  
      private final EnumMap<Level, String> levelMap;
  
      /**
       * Private constructor.
       */
      private LevelPatternConverter(EnumMap<Level, String> map) {
          super("Level", "level");
          this.levelMap = map;
      }
  
      /**
       * Obtains an instance of pattern converter.
       *
       * @param options options, may be null. May contain a list of level names and
       * The value that should be displayed for the Level.
       * @return instance of pattern converter.
       */
      public static LevelPatternConverter newInstance(final String[] options) {
          if (options == null || options.length == 0) {
              return INSTANCE;
          }
          EnumMap<Level, String> levelMap = new EnumMap<Level, String>(Level.class);
          String[] definitions = options[0].split(",");
          for (String def : definitions) {
              String[] pair = def.split("=");
              if (pair == null || pair.length != 2) {
                  LOGGER.error("Invalid option {}", def);
                  continue;
              }
              Level level = Level.toLevel(pair[0].trim(), null);
              if (level == null) {
                  LOGGER.error("Invalid Level {}", pair[0].trim());
              }
              levelMap.put(level, pair[1].trim());
          }
          if (levelMap.size() == 0) {
              return INSTANCE;
          }
          for (Level level : Level.values()) {
              if (!levelMap.containsKey(level)) {
                  levelMap.put(level, level.toString());
              }
          }
          return new LevelPatternConverter(levelMap);
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public void format(final LogEvent event, final StringBuilder output) {
          output.append(levelMap == null ? event.getLevel().toString() : levelMap.get(event.getLevel()));
      }
  
      /**
       * {@inheritDoc}
       */
      @Override
      public String getStyleClass(Object e) {
          if (e instanceof LogEvent) {
              Level level = ((LogEvent) e).getLevel();
  
             switch (level) {
                 case TRACE:
                     return "level trace";
 
                 case DEBUG:
                     return "level debug";
 
                 case INFO:
                     return "level info";
 
                 case WARN:
                     return "level warn";
 
                 case ERROR:
                     return "level error";
 
                 case FATAL:
                     return "level fatal";
 
                 default:
                     return "level " + ((LogEvent) e).getLevel().toString();
             }
         }
 
         return "level";
     }
 }