/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project 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 io.netty.handler.codec.http2;
  
  import static io.netty.util.internal.ObjectUtil.checkNotNull;
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.channel.ChannelHandlerAdapter;
  import io.netty.util.internal.logging.InternalLogLevel;
  import io.netty.util.internal.logging.InternalLogger;
  import io.netty.util.internal.logging.InternalLoggerFactory;
  
  /**
   * Logs HTTP2 frames for debugging purposes.
   */
  public class Http2FrameLogger extends ChannelHandlerAdapter {
  
      public enum Direction {
          INBOUND,
          OUTBOUND
      }
  
      private final InternalLogger logger;
      private final InternalLogLevel level;
  
      public Http2FrameLogger(InternalLogLevel level) {
          this(level, InternalLoggerFactory.getInstance(Http2FrameLogger.class));
      }
  
      public Http2FrameLogger(InternalLogLevel level, InternalLogger logger) {
          this.level = checkNotNull(level, "level");
          this.logger = checkNotNull(logger, "logger");
      }
  
      public void logData(Direction direction, int streamId, ByteBuf data, int padding,
              boolean endStream) {
          log(direction,
                  "DATA: streamId=%d, padding=%d, endStream=%b, length=%d, bytes=%s",
                  streamId, padding, endStream, data.readableBytes(), ByteBufUtil.hexDump(data));
      }
  
      public void logHeaders(Direction direction, int streamId, Http2Headers headers, int padding,
              boolean endStream) {
          log(direction, "HEADERS: streamId:%d, headers=%s, padding=%d, endStream=%b",
                  streamId, headers, padding, endStream);
      }
  
      public void logHeaders(Direction direction, int streamId, Http2Headers headers,
              int streamDependency, short weight, boolean exclusive, int padding, boolean endStream) {
          log(direction,
                  "HEADERS: streamId:%d, headers=%s, streamDependency=%d, weight=%d, exclusive=%b, "
                          + "padding=%d, endStream=%b", streamId, headers,
                  streamDependency, weight, exclusive, padding, endStream);
      }
  
      public void logPriority(Direction direction, int streamId, int streamDependency, short weight,
              boolean exclusive) {
          log(direction, "PRIORITY: streamId=%d, streamDependency=%d, weight=%d, exclusive=%b",
                  streamId, streamDependency, weight, exclusive);
      }
  
      public void logRstStream(Direction direction, int streamId, long errorCode) {
          log(direction, "RST_STREAM: streamId=%d, errorCode=%d", streamId, errorCode);
      }
  
      public void logSettingsAck(Direction direction) {
          log(direction, "SETTINGS ack=true");
      }
  
      public void logSettings(Direction direction, Http2Settings settings) {
          log(direction, "SETTINGS: ack=false, settings=%s", settings);
      }
  
      public void logPing(Direction direction, ByteBuf data) {
          log(direction, "PING: ack=false, length=%d, bytes=%s", data.readableBytes(), ByteBufUtil.hexDump(data));
      }
  
      public void logPingAck(Direction direction, ByteBuf data) {
          log(direction, "PING: ack=true, length=%d, bytes=%s", data.readableBytes(), ByteBufUtil.hexDump(data));
      }
  
      public void logPushPromise(Direction direction, int streamId, int promisedStreamId,
              Http2Headers headers, int padding) {
          log(direction, "PUSH_PROMISE: streamId=%d, promisedStreamId=%d, headers=%s, padding=%d",
                  streamId, promisedStreamId, headers, padding);
      }
 
     public void logGoAway(Direction direction, int lastStreamId, long errorCode, ByteBuf debugData) {
         log(direction, "GO_AWAY: lastStreamId=%d, errorCode=%d, length=%d, bytes=%s", lastStreamId,
                 errorCode, debugData.readableBytes(), ByteBufUtil.hexDump(debugData));
     }
 
     public void logWindowsUpdate(Direction direction, int streamId, int windowSizeIncrement) {
         log(direction, "WINDOW_UPDATE: streamId=%d, windowSizeIncrement=%d", streamId,
                 windowSizeIncrement);
     }
 
     public void logUnknownFrame(Direction direction, byte frameType, int streamId, Http2Flags flags, ByteBuf data) {
         log(direction, "UNKNOWN: frameType=%d, streamId=%d, flags=%d, length=%d, bytes=%s",
                 frameType & 0xFF, streamId, flags.value(), data.readableBytes(), ByteBufUtil.hexDump(data));
     }
 
     private void log(Direction direction, String format, Object... args) {
         if (logger.isEnabled(level)) {
             StringBuilder b = new StringBuilder(200);
             b.append("\n----------------")
              .append(direction.name())
              .append("--------------------\n")
              .append(String.format(format, args))
              .append("\n------------------------------------");
             logger.log(level, b.toString());
         }
     }
 }