content: /*
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
   ~                                                                               ~
   ~ The MIT License (MIT)                                                         ~
   ~                                                                               ~
   ~ Copyright (c) 2015-2025 miaixz.org and other contributors.                    ~
   ~                                                                               ~
   ~ Permission is hereby granted, free of charge, to any person obtaining a copy  ~
   ~ of this software and associated documentation files (the "Software"), to deal ~
   ~ in the Software without restriction, including without limitation the rights  ~
   ~ to use, copy, modify, merge, publish, distribute, sublicense, and/or sell     ~
   ~ copies of the Software, and to permit persons to whom the Software is         ~
   ~ furnished to do so, subject to the following conditions:                      ~
   ~                                                                               ~
   ~ The above copyright notice and this permission notice shall be included in    ~
   ~ all copies or substantial portions of the Software.                           ~
   ~                                                                               ~
   ~ THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR    ~
   ~ IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,      ~
   ~ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE   ~
   ~ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER        ~
   ~ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, ~
   ~ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN     ~
   ~ THE SOFTWARE.                                                                 ~
   ~                                                                               ~
   ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
  */
  package org.miaixz.bus.http.metric.http;
  
  import java.io.IOException;
  import java.net.ProtocolException;
  
  import org.miaixz.bus.core.lang.Normal;
  import org.miaixz.bus.core.lang.Symbol;
  import org.miaixz.bus.core.net.Protocol;
  import org.miaixz.bus.http.Response;
  
  /**
   * HTTP响应“HTTP/ 1.1200 OK”这样的在线状态.
   *
   * @author Kimi Liu
   * @since Java 17+
   */
  public class StatusLine {
  
      public final Protocol protocol;
      public final int code;
      public final String message;
  
      public StatusLine(Protocol protocol, int code, String message) {
          this.protocol = protocol;
          this.code = code;
          this.message = message;
      }
  
      public static StatusLine get(Response response) {
          return new StatusLine(response.protocol(), response.code(), response.message());
      }
  
      public static StatusLine parse(String statusLine) throws IOException {
          int codeStart;
          Protocol protocol;
          if (statusLine.startsWith("HTTP/1.")) {
              if (statusLine.length() < 9 || statusLine.charAt(8) != Symbol.C_SPACE) {
                  throw new ProtocolException("Unexpected status line: " + statusLine);
              }
              int httpMinorVersion = statusLine.charAt(7) - Symbol.C_ZERO;
              codeStart = 9;
              if (httpMinorVersion == 0) {
                  protocol = Protocol.HTTP_1_0;
              } else if (httpMinorVersion == 1) {
                  protocol = Protocol.HTTP_1_1;
              } else {
                  throw new ProtocolException("Unexpected status line: " + statusLine);
              }
          } else if (statusLine.startsWith("ICY ")) {
              // Shoutcast使用的是ICY而不是"HTTP/1.0"
              protocol = Protocol.HTTP_1_0;
              codeStart = 4;
          } else {
              throw new ProtocolException("Unexpected status line: " + statusLine);
          }
  
          // 解析“200”这样的响应代码。总是3位数.
          if (statusLine.length() < codeStart + 3) {
              throw new ProtocolException("Unexpected status line: " + statusLine);
          }
          int code;
          try {
              code = Integer.parseInt(statusLine.substring(codeStart, codeStart + 3));
          } catch (NumberFormatException e) {
              throw new ProtocolException("Unexpected status line: " + statusLine);
          }
  
          // 解析一个可选的响应消息，比如"OK"或"Not Modified",如果存在，则用空格将其与响应代码分隔开.
          String message = Normal.EMPTY;
          if (statusLine.length() > codeStart + 3) {
              if (statusLine.charAt(codeStart + 3) != Symbol.C_SPACE) {
                  throw new ProtocolException("Unexpected status line: " + statusLine);
              }
              message = statusLine.substring(codeStart + 4);
          }
  
          return new StatusLine(protocol, code, message);
      }
  
      @Override
      public String toString() {
          StringBuilder result = new StringBuilder();
          result.append(protocol == Protocol.HTTP_1_0 ? Protocol.HTTP_1_0.name : Protocol.HTTP_1_1.name);
          result.append(Symbol.C_SPACE).append(code);
          if (null != message) {
              result.append(Symbol.C_SPACE).append(message);
          }
          return result.toString();
      }
  
  }
  