/*
    * Copyright 2017 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:
    *
    *   https://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.http;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.buffer.ByteBufUtil;
  import io.netty.buffer.Unpooled;
  import io.netty.microbench.util.AbstractMicrobenchmark;
  import io.netty.util.AsciiString;
  import io.netty.util.CharsetUtil;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Measurement;
  import org.openjdk.jmh.annotations.Scope;
  import org.openjdk.jmh.annotations.State;
  import org.openjdk.jmh.annotations.Warmup;
  
  import static io.netty.handler.codec.http.HttpConstants.*;
  
  @State(Scope.Benchmark)
  @Warmup(iterations = 10)
  @Measurement(iterations = 20)
  public class HttpRequestEncoderInsertBenchmark extends AbstractMicrobenchmark {
  
      private final String uri = "http://localhost?eventType=CRITICAL&from=0&to=1497437160327&limit=10&offset=0";
      private final OldHttpRequestEncoder encoderOld = new OldHttpRequestEncoder();
      private final HttpRequestEncoder encoderNew = new HttpRequestEncoder();
  
      @Benchmark
      public ByteBuf oldEncoder() throws Exception {
          ByteBuf buffer = Unpooled.buffer(100);
          try {
              encoderOld.encodeInitialLine(buffer, new DefaultHttpRequest(HttpVersion.HTTP_1_1,
                      HttpMethod.GET, uri));
              return buffer;
          } finally {
              buffer.release();
          }
      }
  
      @Benchmark
      public ByteBuf newEncoder() throws Exception {
          ByteBuf buffer = Unpooled.buffer(100);
          try {
              encoderNew.encodeInitialLine(buffer, new DefaultHttpRequest(HttpVersion.HTTP_1_1,
                      HttpMethod.GET, uri));
              return buffer;
          } finally {
              buffer.release();
          }
      }
  
      private static class OldHttpRequestEncoder extends HttpObjectEncoder<HttpRequest> {
          private static final byte[] CRLF = {CR, LF};
          private static final char SLASH = '/';
          private static final char QUESTION_MARK = '?';
  
          @Override
          public boolean acceptOutboundMessage(Object msg) throws Exception {
              return super.acceptOutboundMessage(msg) && !(msg instanceof HttpResponse);
          }
  
          @Override
          protected void encodeInitialLine(ByteBuf buf, HttpRequest request) throws Exception {
              AsciiString method = request.method().asciiName();
              ByteBufUtil.copy(method, method.arrayOffset(), buf, method.length());
              buf.writeByte(SP);
  
              // Add / as absolute path if no is present.
              // See https://tools.ietf.org/html/rfc2616#section-5.1.2
              String uri = request.uri();
  
              if (uri.isEmpty()) {
                  uri += SLASH;
              } else {
                  int start = uri.indexOf("://");
                  if (start != -1 && uri.charAt(0) != SLASH) {
                      int startIndex = start + 3;
                      // Correctly handle query params.
                      // See https://github.com/netty/netty/issues/2732
                      int index = uri.indexOf(QUESTION_MARK, startIndex);
                      if (index == -1) {
                          if (uri.lastIndexOf(SLASH) <= startIndex) {
                              uri += SLASH;
                          }
                      } else {
                          if (uri.lastIndexOf(SLASH, index) <= startIndex) {
                             int len = uri.length();
                             StringBuilder sb = new StringBuilder(len + 1);
                             sb.append(uri, 0, index)
                                     .append(SLASH)
                                     .append(uri, index, len);
                             uri = sb.toString();
                         }
                     }
                 }
             }
 
             buf.writeBytes(uri.getBytes(CharsetUtil.UTF_8));
 
             buf.writeByte(SP);
             request.protocolVersion().encode(buf);
             buf.writeBytes(CRLF);
         }
     }
 }