/*
    * 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.config;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.LogManager;
  import org.apache.logging.log4j.Logger;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.core.Appender;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.LifeCycle;
  import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
  import org.apache.logging.log4j.core.filter.AbstractFilterable;
  import org.apache.logging.log4j.core.impl.Log4jLogEvent;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.impl.LogEventFactory;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttr;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.core.config.plugins.PluginElement;
  import org.apache.logging.log4j.status.StatusLogger;
  import org.apache.logging.log4j.message.Message;
  
  import java.util.ArrayList;
  import java.util.Arrays;
  import java.util.Collection;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Locale;
  import java.util.Map;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.concurrent.atomic.AtomicInteger;
  
  /**
   * Logger object that is created via configuration.
   */
  @Plugin(name = "logger", type = "Core", printObject = true)
  public class LoggerConfig extends AbstractFilterable implements LogEventFactory {
  
      private static final Logger LOGGER = StatusLogger.getLogger();
      private static final int MAX_RETRIES = 3;
      private static final long WAIT_TIME = 1000;
  
      private List<AppenderRef> appenderRefs = new ArrayList<AppenderRef>();
      private Map<String, AppenderControl> appenders = new ConcurrentHashMap<String, AppenderControl>();
      private final String name;
      private LogEventFactory logEventFactory;
      private Level level;
      private boolean additive = true;
      private LoggerConfig parent;
      private AtomicInteger counter = new AtomicInteger();
      private boolean shutdown = false;
      private final Map<Property, Boolean> properties;
      private final Configuration config;
  
  
      /**
       * Default constructor.
       */
      public LoggerConfig() {
          this.logEventFactory = this;
          this.level = Level.ERROR;
          this.name = "";
          this.properties = null;
          this.config = null;
      }
  
      /**
       * Constructor that sets the name, level and additive values.
       * @param name The Logger name.
       * @param level The Level.
       * @param additive true if the Logger is additive, false otherwise.
       */
      public LoggerConfig(String name, Level level, boolean additive) {
          this.logEventFactory = this;
          this.name = name;
          this.level = level;
          this.additive = additive;
          this.properties = null;
          this.config = null;
      }
  
      protected LoggerConfig(String name, List<AppenderRef> appenders, Filter filter, Level level,
                             boolean additive, Property[] properties, Configuration config) {
         super(filter);
         this.logEventFactory = this;
         this.name = name;
         this.appenderRefs = appenders;
         this.level = level;
         this.additive = additive;
         this.config = config;
         if (properties != null && properties.length > 0) {
             this.properties = new HashMap<Property, Boolean>(properties.length);
             for (Property prop : properties) {
                 boolean interpolate = prop.getValue().contains("${");
                 this.properties.put(prop, interpolate);
             }
         } else {
             this.properties = null;
         }
     }
 
     @Override
     public Filter getFilter() {
         return super.getFilter();
     }
 
     /**
      * Returns the name of the LoggerConfig.
      * @return the name of the LoggerConfig.
      */
     public String getName() {
         return name;
     }
 
     /**
      * Sets the parent of this LoggerConfig.
      * @param parent the parent LoggerConfig.
      */
     public void setParent(LoggerConfig parent) {
         this.parent = parent;
     }
 
     /**
      * Returns the parent of this LoggerConfig.
      * @return the LoggerConfig that is the parent of this one.
      */
     public LoggerConfig getParent() {
         return this.parent;
     }
 
     /**
      * Adds an Appender to the LoggerConfig.
      * @param appender The Appender to add.
      * @param level The Level to use.
      * @param filter A Filter for the Appender reference.
      */
     public void addAppender(Appender appender, Level level, Filter filter) {
         appenders.put(appender.getName(), new AppenderControl(appender, level, filter));
     }
 
     /**
      * Removes the Appender with the specific name.
      * @param name The name of the Appender.
      */
     public void removeAppender(String name) {
         AppenderControl ctl = appenders.remove(name);
         if (ctl != null) {
             cleanupFilter(ctl);
         }
     }
 
     /**
      * Returns all Appenders as a Map.
      * @return a Map with the Appender name as the key and the Appender as the value.
      */
     public Map<String, Appender> getAppenders() {
         Map<String, Appender> map = new HashMap<String, Appender>();
         for (Map.Entry<String, AppenderControl> entry : appenders.entrySet()) {
             map.put(entry.getKey(), entry.getValue().getAppender());
         }
         return map;
     }
 
     /**
      * Removes all Appenders.
      */
     protected void clearAppenders() {
         waitForCompletion();
         Collection<AppenderControl> controls = appenders.values();
         Iterator<AppenderControl> iterator = controls.iterator();
         while (iterator.hasNext()) {
             AppenderControl ctl = iterator.next();
             iterator.remove();
             cleanupFilter(ctl);
         }
     }
 
     private void cleanupFilter(AppenderControl ctl) {
         Filter filter = ctl.getFilter();
         if (filter != null) {
             ctl.removeFilter(filter);
             if (filter instanceof LifeCycle) {
                 ((LifeCycle) filter).stop();
             }
         }
     }
 
     /**
      * Returns the Appender references.
      * @return a List of all the Appender names attached to this LoggerConfig.
      */
     public List<AppenderRef> getAppenderRefs() {
         return appenderRefs;
     }
 
     /**
      * Sets the logging Level.
      * @param level The logging Level.
      */
     public void setLevel(Level level) {
         this.level = level;
     }
 
     /**
      * Returns the logging Level.
      * @return the logging Level.
      */
     public Level getLevel() {
         return level;
     }
 
     /**
      * Returns the LogEventFactory.
      * @return the LogEventFactory.
      */
     public LogEventFactory getLogEventFactory() {
         return logEventFactory;
     }
 
     /**
      * Sets the LogEventFactory. Usually the LogEventFactory will be this LoggerConfig.
      * @param logEventFactory the LogEventFactory.
      */
     public void setLogEventFactory(LogEventFactory logEventFactory) {
         this.logEventFactory = logEventFactory;
     }
 
     /**
      * Returns the valid of the additive flag.
      * @return true if the LoggerConfig is additive, false otherwise.
      */
     public boolean isAdditive() {
         return additive;
     }
 
     /**
      * Sets the additive setting.
      * @param additive true if thee LoggerConfig should be additive, false otherwise.
      */
     public void setAdditive(boolean additive) {
         this.additive = additive;
     }
 
     /**
      * Logs an event.
      * @param loggerName The name of the Logger.
      * @param marker A Marker or null if none is present.
      * @param fqcn The fully qualified class name of the caller.
      * @param level The event Level.
      * @param data The Message.
      * @param t A Throwable or null.
      */
     public void log(String loggerName, Marker marker, String fqcn, Level level, Message data, Throwable t) {
         List<Property> props = null;
         if (properties != null) {
             props = new ArrayList<Property>(properties.size());
 
             for (Map.Entry<Property, Boolean> entry : properties.entrySet()) {
                 Property prop = entry.getKey();
                 String value = entry.getValue() ? config.getSubst().replace(prop.getValue()) : prop.getValue();
                 props.add(Property.createProperty(prop.getName(), value));
             }
         }
         LogEvent event = logEventFactory.createEvent(loggerName, marker, fqcn, level, data, props, t);
         log(event);
     }
 
     /**
      * Waits for all log events to complete before shutting down this loggerConfig.
      */
     private synchronized void waitForCompletion() {
         if (shutdown) {
             return;
         }
         shutdown = true;
         int retries = 0;
         while (counter.get() > 0) {
             try {
                 wait(WAIT_TIME * (retries + 1));
             } catch (InterruptedException ie) {
                 if (++retries > MAX_RETRIES) {
                     break;
                 }
             }
         }
     }
 
     /**
      * Logs an event.
      * @param event The log event.
      */
     public void log(LogEvent event) {
 
         counter.incrementAndGet();
         try {
             if (isFiltered(event)) {
                 return;
             }
 
             callAppenders(event);
 
             if (additive && parent != null) {
                 parent.log(event);
             }
         } finally {
             if (counter.decrementAndGet() == 0) {
                 synchronized (this) {
                     if (shutdown) {
                         notifyAll();
                     }
                 }
 
             }
         }
     }
 
     private void callAppenders(LogEvent event) {
         for (AppenderControl control : appenders.values()) {
             control.callAppender(event);
         }
     }
 
     /**
      * Creates a log event.
      * @param loggerName The name of the Logger.
      * @param marker An optional Marker.
      * @param fqcn The fully qualified class name of the caller.
      * @param level The event Level.
      * @param data The Message.
      * @param t An optional Throwable.
      * @return The LogEvent.
      */
     public LogEvent createEvent(String loggerName, Marker marker, String fqcn, Level level, Message data,
                                 List<Property> properties, Throwable t) {
         return new Log4jLogEvent(loggerName, marker, fqcn, level, data, properties, t);
     }
 
     @Override
     public String toString() {
         return name == null || name.length() == 0 ? "root" : name;
     }
 
     /**
      * Factory method to create a LoggerConfig.
      * @param additivity True if additive, false otherwise.
      * @param levelName The Level to be associated with the Logger.
      * @param loggerName The name of the Logger.
      * @param refs An array of Appender names.
      * @param filter A Filter.
      * @return A new LoggerConfig.
      */
     @PluginFactory
     public static LoggerConfig createLogger(@PluginAttr("additivity") String additivity,
                                             @PluginAttr("level") String levelName,
                                             @PluginAttr("name") String loggerName,
                                             @PluginElement("appender-ref") AppenderRef[] refs,
                                             @PluginElement("properties") Property[] properties,
                                             @PluginConfiguration Configuration config,
                                             @PluginElement("filters") Filter filter) {
         if (loggerName == null) {
             LOGGER.error("Loggers cannot be configured without a name");
             return null;
         }
 
         List<AppenderRef> appenderRefs = Arrays.asList(refs);
         Level level;
         try {
             level = Level.toLevel(levelName, Level.ERROR);
         } catch (Exception ex) {
             LOGGER.error("Invalid Log level specified: {}. Defaulting to Error", levelName);
             level = Level.ERROR;
         }
         String name = loggerName.equals("root") ? "" : loggerName;
         boolean additive = additivity == null ? true : Boolean.parseBoolean(additivity);
 
         return new LoggerConfig(name, appenderRefs, filter, level, additive, properties, config);
     }
 
     /**
      * The root Logger.
      */
     @Plugin(name = "root", type = "Core", printObject = true)
     public static class RootLogger extends LoggerConfig {
 
         @PluginFactory
         public static LoggerConfig createLogger(@PluginAttr("additivity") String additivity,
                                             @PluginAttr("level") String levelName,
                                             @PluginElement("appender-ref") AppenderRef[] refs,
                                             @PluginElement("properties") Property[] properties,
                                             @PluginConfiguration Configuration config,
                                             @PluginElement("filters") Filter filter) {
             List<AppenderRef> appenderRefs = Arrays.asList(refs);
             Level level;
             try {
                 level = Level.toLevel(levelName, Level.ERROR);
             } catch (Exception ex) {
                 LOGGER.error("Invalid Log level specified: {}. Defaulting to Error", levelName);
                 level = Level.ERROR;
             }
             boolean additive = additivity == null ? true : Boolean.parseBoolean(additivity);
 
             return new LoggerConfig(LogManager.ROOT_LOGGER_NAME, appenderRefs, filter, level, additive, properties,
                 config);
         }
     }
 
 }