/*
    * 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.log4j.bridge;
  
  import org.apache.log4j.NDC;
  import org.apache.log4j.helpers.OptionConverter;
  import org.apache.log4j.spi.LocationInfo;
  import org.apache.log4j.spi.LoggingEvent;
  import org.apache.log4j.spi.ThrowableInformation;
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.ThreadContext;
  import org.apache.logging.log4j.core.LogEvent;
  import org.apache.logging.log4j.core.impl.ThrowableProxy;
  import org.apache.logging.log4j.core.time.Instant;
  import org.apache.logging.log4j.core.time.MutableInstant;
  import org.apache.logging.log4j.message.Message;
  import org.apache.logging.log4j.message.SimpleMessage;
  import org.apache.logging.log4j.spi.MutableThreadContextStack;
  import org.apache.logging.log4j.util.BiConsumer;
  import org.apache.logging.log4j.util.ReadOnlyStringMap;
  import org.apache.logging.log4j.util.TriConsumer;
  
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Objects;
  
  /**
   * Exposes a Log4j 1 logging event as a Log4j 2 LogEvent.
   */
  public class LogEventWrapper implements LogEvent {
  
      private final LoggingEvent event;
      private final ContextDataMap contextData;
      private final MutableThreadContextStack contextStack;
      private Thread thread;
  
      public LogEventWrapper(LoggingEvent event) {
          this.event = event;
          this.contextData = new ContextDataMap(event.getProperties());
          this.contextStack = new MutableThreadContextStack(NDC.cloneStack());
          this.thread = Objects.equals(event.getThreadName(), Thread.currentThread().getName())
                  ? Thread.currentThread() : null;
      }
  
      @Override
      public LogEvent toImmutable() {
          return this;
      }
  
      @Override
      public Map<String, String> getContextMap() {
          return contextData;
      }
  
      @Override
      public ReadOnlyStringMap getContextData() {
          return contextData;
      }
  
      @Override
      public ThreadContext.ContextStack getContextStack() {
          return contextStack;
      }
  
      @Override
      public String getLoggerFqcn() {
          return null;
      }
  
      @Override
      public Level getLevel() {
          return OptionConverter.convertLevel(event.getLevel());
      }
  
      @Override
      public String getLoggerName() {
          return event.getLoggerName();
      }
  
      @Override
      public Marker getMarker() {
          return null;
      }
  
     @Override
     public Message getMessage() {
         return new SimpleMessage(event.getRenderedMessage());
     }
 
     @Override
     public long getTimeMillis() {
         return event.getTimeStamp();
     }
 
     @Override
     public Instant getInstant() {
         MutableInstant mutable = new MutableInstant();
         mutable.initFromEpochMilli(event.getTimeStamp(), 0);
         return mutable;
     }
 
     @Override
     public StackTraceElement getSource() {
         LocationInfo info = event.getLocationInformation();
         return new StackTraceElement(info.getClassName(), info.getMethodName(), info.getFileName(),
                 Integer.parseInt(info.getLineNumber()));
     }
 
     @Override
     public String getThreadName() {
         return event.getThreadName();
     }
 
     @Override
     public long getThreadId() {
         Thread thread = getThread();
         return thread != null ? thread.getId() : 0;
     }
 
     @Override
     public int getThreadPriority() {
         Thread thread = getThread();
         return thread != null ? thread.getPriority() : 0;
     }
 
     private Thread getThread() {
         if (thread == null && event.getThreadName() != null) {
             for (Thread thread : Thread.getAllStackTraces().keySet()) {
                 if (thread.getName().equals(event.getThreadName())) {
                     this.thread = thread;
                     return thread;
                 }
             }
         }
         return thread;
     }
 
     @Override
     public Throwable getThrown() {
         ThrowableInformation throwableInformation = event.getThrowableInformation();
         return throwableInformation == null ? null : throwableInformation.getThrowable();
     }
 
     @Override
     public ThrowableProxy getThrownProxy() {
         return null;
     }
 
     @Override
     public boolean isEndOfBatch() {
         return false;
     }
 
     @Override
     public boolean isIncludeLocation() {
         return false;
     }
 
     @Override
     public void setEndOfBatch(boolean endOfBatch) {
 
     }
 
     @Override
     public void setIncludeLocation(boolean locationRequired) {
 
     }
 
     @Override
     public long getNanoTime() {
         return 0;
     }
 
     private static class ContextDataMap extends HashMap<String, String> implements ReadOnlyStringMap {
 
         ContextDataMap(Map<String, String> map) {
             if (map != null) {
                 super.putAll(map);
             }
         }
 
         @Override
         public Map<String, String> toMap() {
             return this;
         }
 
         @Override
         public boolean containsKey(String key) {
             return super.containsKey(key);
         }
 
         @Override
         public <V> void forEach(BiConsumer<String, ? super V> action) {
             super.forEach((k,v) -> action.accept(k, (V) v));
         }
 
         @Override
         public <V, S> void forEach(TriConsumer<String, ? super V, S> action, S state) {
             super.forEach((k,v) -> action.accept(k, (V) v, state));
         }
 
         @Override
         public <V> V getValue(String key) {
             return (V) super.get(key);
         }
     }
 }