/*
    * 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.http;
  
  import io.netty.util.internal.StringUtil;
  
  import java.util.Map;
  
  /**
   * Provides some utility methods for HTTP message implementations.
   */
  final class HttpMessageUtil {
  
      static StringBuilder appendRequest(StringBuilder buf, HttpRequest req) {
          appendCommon(buf, req);
          appendInitialLine(buf, req);
          appendHeaders(buf, req.headers());
          removeLastNewLine(buf);
          return buf;
      }
  
      static StringBuilder appendResponse(StringBuilder buf, HttpResponse res) {
          appendCommon(buf, res);
          appendInitialLine(buf, res);
          appendHeaders(buf, res.headers());
          removeLastNewLine(buf);
          return buf;
      }
  
      private static void appendCommon(StringBuilder buf, HttpMessage msg) {
          buf.append(StringUtil.simpleClassName(msg));
          buf.append("(decodeResult: ");
          buf.append(msg.getDecoderResult());
          buf.append(", version: ");
          buf.append(msg.getProtocolVersion());
          buf.append(')');
          buf.append(StringUtil.NEWLINE);
      }
  
      static StringBuilder appendFullRequest(StringBuilder buf, FullHttpRequest req) {
          appendFullCommon(buf, req);
          appendInitialLine(buf, req);
          appendHeaders(buf, req.headers());
          appendHeaders(buf, req.trailingHeaders());
          removeLastNewLine(buf);
          return buf;
      }
  
      static StringBuilder appendFullResponse(StringBuilder buf, FullHttpResponse res) {
          appendFullCommon(buf, res);
          appendInitialLine(buf, res);
          appendHeaders(buf, res.headers());
          appendHeaders(buf, res.trailingHeaders());
          removeLastNewLine(buf);
          return buf;
      }
  
      private static void appendFullCommon(StringBuilder buf, FullHttpMessage msg) {
          buf.append(StringUtil.simpleClassName(msg));
          buf.append("(decodeResult: ");
          buf.append(msg.getDecoderResult());
          buf.append(", version: ");
          buf.append(msg.getProtocolVersion());
          buf.append(", content: ");
          buf.append(msg.content());
          buf.append(')');
          buf.append(StringUtil.NEWLINE);
      }
  
      private static void appendInitialLine(StringBuilder buf, HttpRequest req) {
          buf.append(req.getMethod());
          buf.append(' ');
          buf.append(req.getUri());
          buf.append(' ');
          buf.append(req.getProtocolVersion());
          buf.append(StringUtil.NEWLINE);
      }
  
      private static void appendInitialLine(StringBuilder buf, HttpResponse res) {
          buf.append(res.getProtocolVersion());
          buf.append(' ');
          buf.append(res.getStatus());
          buf.append(StringUtil.NEWLINE);
      }
  
     private static void appendHeaders(StringBuilder buf, HttpHeaders headers) {
         for (Map.Entry<String, String> e: headers) {
             buf.append(e.getKey());
             buf.append(": ");
             buf.append(e.getValue());
             buf.append(StringUtil.NEWLINE);
         }
     }
 
     private static void removeLastNewLine(StringBuilder buf) {
         buf.setLength(buf.length() - StringUtil.NEWLINE.length());
     }
 
     private HttpMessageUtil() { }
 }