#pragma once

#include "envoy/config/trace/v3/opentelemetry.pb.h"

#include "source/extensions/tracers/opentelemetry/resource_detectors/resource_detector.h"

namespace Envoy {

namespace Extensions {

namespace Tracers {

namespace OpenTelemetry {

constexpr absl::string_view kServiceNameKey = "service.name";

constexpr absl::string_view kDefaultServiceName = "unknown_service:envoy";

constexpr absl::string_view kTelemetrySdkLanguageKey = "telemetry.sdk.language";

constexpr absl::string_view kDefaultTelemetrySdkLanguage = "cpp";

constexpr absl::string_view kTelemetrySdkNameKey = "telemetry.sdk.name";

constexpr absl::string_view kDefaultTelemetrySdkName = "envoy";

constexpr absl::string_view kTelemetrySdkVersionKey = "telemetry.sdk.version";

class ResourceProvider : public Logger::Loggable<Logger::Id::tracing> {

public:

  /**

   * @brief Iterates through all loaded resource detectors and merge all the returned

   * resources into one. Resource merging is done according to the OpenTelemetry

   * resource SDK specification. @see

   * https://github.com/open-telemetry/opentelemetry-specification/blob/v1.24.0/specification/resource/sdk.md#merge.

   *

   * @param opentelemetry_config The OpenTelemetry configuration, which contains the configured

   * resource detectors.

   * @param context The tracer factory context.

   * @return Resource const The merged resource.

   */

  virtual Resource

  getResource(const Protobuf::RepeatedPtrField<envoy::config::core::v3::TypedExtensionConfig>&

                  resource_detectors,

              Server::Configuration::ServerFactoryContext& context,

              absl::string_view service_name) const PURE;

};

using ResourceProviderPtr = std::shared_ptr<ResourceProvider>;

class ResourceProviderImpl : public ResourceProvider {

public:

  Resource

  getResource(const Protobuf::RepeatedPtrField<envoy::config::core::v3::TypedExtensionConfig>&

                  resource_detectors,

              Server::Configuration::ServerFactoryContext& context,

              absl::string_view service_name) const override;

};

} // namespace OpenTelemetry

} // namespace Tracers

} // namespace Extensions

} // namespace Envoy