#ifndef QUICHE_SPDY_CORE_HTTP2_HEADER_BLOCK_HPACK_LISTENER_H_
#define QUICHE_SPDY_CORE_HTTP2_HEADER_BLOCK_HPACK_LISTENER_H_

#include "absl/strings/string_view.h"
#include "quiche/http2/hpack/decoder/hpack_decoder_listener.h"
#include "quiche/common/platform/api/quiche_export.h"
#include "quiche/common/platform/api/quiche_logging.h"
#include "quiche/spdy/core/http2_header_block.h"

namespace spdy {

// This class simply gathers the key-value pairs emitted by an HpackDecoder in
// a Http2HeaderBlock.
class QUICHE_EXPORT_PRIVATE Http2HeaderBlockHpackListener
    : public http2::HpackDecoderListener {
 public:
  Http2HeaderBlockHpackListener() {}

  void OnHeaderListStart() override {
    header_block_.clear();
    hpack_error_ = false;
  }

  void OnHeader(const std::string& name, const std::string& value) override {
    header_block_.AppendValueOrAddHeader(name, value);
  }

  void OnHeaderListEnd() override {}

  void OnHeaderErrorDetected(absl::string_view error_message) override {
    QUICHE_VLOG(1) << error_message;
    hpack_error_ = true;
  }

  Http2HeaderBlock release_header_block() {
    Http2HeaderBlock block = std::move(header_block_);
    header_block_ = {};
    return block;
  }
  bool hpack_error() const { return hpack_error_; }

 private:
  Http2HeaderBlock header_block_;
  bool hpack_error_ = false;
};

}  // namespace spdy

#endif  // QUICHE_SPDY_CORE_HTTP2_HEADER_BLOCK_HPACK_LISTENER_H_