/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * Licensed 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.
 */

#ifndef THRIFT_TRANSPORT_THTTPCLIENT_H_
#define THRIFT_TRANSPORT_THTTPCLIENT_H_ 1

#include <thrift/lib/cpp/transport/THttpTransport.h>

namespace apache {
namespace thrift {
namespace transport {

class THttpClient : public THttpTransport {
  typedef std::map<std::string, std::string> StringToStringMap;

 public:
  /*
   * Create for a given host and port.  The version that doesn't take
   * a transport constructs its own TSocket as a transport.
   *
   * The path must be non-empty and start with "/".
   */
  THttpClient(
      const std::shared_ptr<TTransport>& transport,
      const std::string& host,
      const std::string& path);
  THttpClient(const std::string& host, int port, const std::string& path);

  ~THttpClient() override;

  void setUserAgent(const std::string&);

  void setHeader(const std::string& name, const std::string& value);

  StringToStringMap& getRequestHeaders() { return requestHeaders_; }

  const StringToStringMap& getResponseHeaders() const {
    return responseHeaders_;
  }

  void flush() override;

  void close() override {
    connectionClosedByServer_ = false;
    THttpTransport::close();
  }

  void init() override {
    /*
     * HTTP requires that the `abs_path' component of a POST message start
     * with '/' (see rfc2616 and rfc2396).
     */
    assert(!path_.empty() && path_[0] == '/');

    THttpTransport::init();
  }

  const std::string& getHost() const { return host_; }

  void setHost(const std::string& host) { host_ = host; }

  const std::string& getPath() const { return path_; }

  const static std::string kAcceptHeader;
  const static std::string kConnectionHeader;
  const static std::string kContentLengthHeader;
  const static std::string kContentTypeHeader;
  const static std::string kHostHeader;
  const static std::string kTransferEncodingHeader;
  const static std::string kUserAgentHeader;

 protected:
  std::string host_;
  const std::string path_;
  bool connectionClosedByServer_;
  uint16_t statusCode_;
  StringToStringMap requestHeaders_;
  StringToStringMap responseHeaders_;

  void beginParsingHeaders() override;
  void parseHeader(char* header) override;
  bool parseStatusLine(char* status) override;
  void endParsingHeaders() override;
};

} // namespace transport
} // namespace thrift
} // namespace apache

#endif // #ifndef THRIFT_TRANSPORT_THTTPCLIENT_H_