#pragma once

#include <string>

#include "envoy/http/header_map.h"

#include "source/common/singleton/const_singleton.h"

#include "source/common/tracing/trace_context_impl.h"

namespace Envoy {

namespace Extensions {

namespace Tracers {

namespace Zipkin {

namespace {

constexpr char KIND_CLIENT[] = "CLIENT";

constexpr char KIND_SERVER[] = "SERVER";

constexpr char CLIENT_SEND[] = "cs";

constexpr char CLIENT_RECV[] = "cr";

constexpr char SERVER_SEND[] = "ss";

constexpr char SERVER_RECV[] = "sr";

constexpr char HTTP_HOST[] = "http.host";

constexpr char HTTP_METHOD[] = "http.method";

constexpr char HTTP_PATH[] = "http.path";

constexpr char HTTP_URL[] = "http.url";

constexpr char HTTP_STATUS_CODE[] = "http.status_code";

constexpr char HTTP_REQUEST_SIZE[] = "http.request.size";

constexpr char HTTP_RESPONSE_SIZE[] = "http.response.size";

constexpr char LOCAL_COMPONENT[] = "lc";

constexpr char ERROR[] = "error";

constexpr char CLIENT_ADDR[] = "ca";

constexpr char SERVER_ADDR[] = "sa";

constexpr char SAMPLED[] = "1";

constexpr char NOT_SAMPLED[] = "0";

constexpr bool DEFAULT_SHARED_SPAN_CONTEXT = true;

} // namespace

class ZipkinCoreConstantValues {

public:

  // Zipkin B3 headers

  const Tracing::TraceContextHandler X_B3_TRACE_ID{"x-b3-traceid"};

  const Tracing::TraceContextHandler X_B3_SPAN_ID{"x-b3-spanid"};

  const Tracing::TraceContextHandler X_B3_PARENT_SPAN_ID{"x-b3-parentspanid"};

  const Tracing::TraceContextHandler X_B3_SAMPLED{"x-b3-sampled"};

  const Tracing::TraceContextHandler X_B3_FLAGS{"x-b3-flags"};

  // Zipkin b3 single header

  const Tracing::TraceContextHandler B3{"b3"};

  // W3C trace context headers

  const Tracing::TraceContextHandler TRACE_PARENT{"traceparent"};

  const Tracing::TraceContextHandler TRACE_STATE{"tracestate"};

};

using ZipkinCoreConstants = ConstSingleton<ZipkinCoreConstantValues>;

} // namespace Zipkin

} // namespace Tracers

} // namespace Extensions

} // namespace Envoy