/*
    * 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.filter;
  
  import javax.script.SimpleBindings;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.core.Filter;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.Logger;
  import org.apache.logging.log4j.core.config.Configuration;
  import org.apache.logging.log4j.core.config.Node;
  import org.apache.logging.log4j.core.config.plugins.Plugin;
  import org.apache.logging.log4j.core.config.plugins.PluginAttribute;
  import org.apache.logging.log4j.core.config.plugins.PluginConfiguration;
  import org.apache.logging.log4j.core.config.plugins.PluginElement;
  import org.apache.logging.log4j.core.config.plugins.PluginFactory;
  import org.apache.logging.log4j.core.script.AbstractScript;
  import org.apache.logging.log4j.core.script.ScriptRef;
  import org.apache.logging.log4j.message.Message;
  import org.apache.logging.log4j.message.ObjectMessage;
  import org.apache.logging.log4j.message.SimpleMessage;
  import org.apache.logging.log4j.status.StatusLogger;
  
  /**
   * Returns the onMatch result if the script returns True and returns the onMisMatch value otherwise.
   */
  @Plugin(name = "ScriptFilter", category = Node.CATEGORY, elementType = Filter.ELEMENT_TYPE, printObject = true)
  public final class ScriptFilter extends AbstractFilter {
  
      private static final long serialVersionUID = 1L;
      private static org.apache.logging.log4j.Logger logger = StatusLogger.getLogger();
  
      private final AbstractScript script;
      private final Configuration configuration;
  
      private ScriptFilter(final AbstractScript script, final Configuration configuration, final Result onMatch,
                           final Result onMismatch) {
          super(onMatch, onMismatch);
          this.script = script;
          this.configuration = configuration;
          if (!(script instanceof ScriptRef)) {
              configuration.getScriptManager().addScript(script);
          }
      }
  
      @Override
      public Result filter(final Logger logger, final Level level, final Marker marker, final String msg,
                           final Object... params) {
          SimpleBindings bindings = new SimpleBindings();
          bindings.put("logger", logger);
          bindings.put("level", level);
          bindings.put("marker", marker);
          bindings.put("message", new SimpleMessage(msg));
          bindings.put("parameters", params);
          bindings.put("throwable", null);
          bindings.putAll(configuration.getProperties());
          bindings.put("substitutor", configuration.getStrSubstitutor());
          Object object = configuration.getScriptManager().execute(script.getName(), bindings);
          return object == null || !Boolean.TRUE.equals(object) ? onMismatch : onMatch;
      }
  
      @Override
      public Result filter(final Logger logger, final Level level, final Marker marker, final Object msg,
                           final Throwable t) {
          SimpleBindings bindings = new SimpleBindings();
          bindings.put("logger", logger);
          bindings.put("level", level);
          bindings.put("marker", marker);
          bindings.put("message", msg instanceof String ? new SimpleMessage((String)msg) : new ObjectMessage(msg));
          bindings.put("parameters", null);
          bindings.put("throwable", t);
          bindings.putAll(configuration.getProperties());
          bindings.put("substitutor", configuration.getStrSubstitutor());
          Object object = configuration.getScriptManager().execute(script.getName(), bindings);
          return object == null || !Boolean.TRUE.equals(object) ? onMismatch : onMatch;
      }
  
      @Override
      public Result filter(final Logger logger, final Level level, final Marker marker, final Message msg,
                           final Throwable t) {
          SimpleBindings bindings = new SimpleBindings();
          bindings.put("logger", logger);
          bindings.put("level", level);
         bindings.put("marker", marker);
         bindings.put("message", msg);
         bindings.put("parameters", null);
         bindings.put("throwable", t);
         bindings.putAll(configuration.getProperties());
         bindings.put("substitutor", configuration.getStrSubstitutor());
         Object object = configuration.getScriptManager().execute(script.getName(), bindings);
         return object == null || !Boolean.TRUE.equals(object) ? onMismatch : onMatch;
     }
 
     @Override
     public Result filter(final LogEvent event) {
         SimpleBindings bindings = new SimpleBindings();
         bindings.put("logEvent", event);
         bindings.putAll(configuration.getProperties());
         bindings.put("substitutor", configuration.getStrSubstitutor());
         Object object = configuration.getScriptManager().execute(script.getName(), bindings);
         return object == null || !Boolean.TRUE.equals(object) ? onMismatch : onMatch;
     }
 
     @Override
     public String toString() {
         return script.getName();
     }
 
     /**
      * Creates the ScriptFilter.
      * @param script The script to run. The script must return a boolean value. Either script or scriptFile must be 
      *      provided.
      * @param match The action to take if a match occurs.
      * @param mismatch The action to take if no match occurs.
      * @param configuration the configuration 
      * @return A ScriptFilter.
      */
     @PluginFactory
     public static ScriptFilter createFilter(
             @PluginElement("Script") final AbstractScript script,
             @PluginAttribute("onMatch") final Result match,
             @PluginAttribute("onMismatch") final Result mismatch,
             @PluginConfiguration final Configuration configuration) {
 
         if (script == null) {
             LOGGER.error("A Script, ScriptFile or ScriptRef element must be provided for this ScriptFilter");
             return null;
         }
         if (script instanceof ScriptRef) {
             if (configuration.getScriptManager().getScript(script.getName()) == null) {
                 logger.error("No script with name {} has been declared.", script.getName());
                 return null;
             }
         }
 
         return new ScriptFilter(script, configuration, match, mismatch);
     }
 
 }