#pragma once

#include "envoy/server/factory_context.h"

#include "source/common/common/logger.h"

#include "source/common/config/datasource.h"

#include "source/extensions/tracers/opentelemetry/samplers/sampler.h"

namespace Envoy {

namespace Extensions {

namespace Tracers {

namespace OpenTelemetry {

/**

 * @brief A sampler which samples every span.

 * https://opentelemetry.io/docs/specs/otel/trace/sdk/#alwayson

 * - Returns RecordAndSample always.

 * - Description MUST be AlwaysOnSampler.

 *

 */

class AlwaysOnSampler : public Sampler, Logger::Loggable<Logger::Id::tracing> {

public:

  explicit AlwaysOnSampler(const Protobuf::Message& /*config*/,

  SamplingResult shouldSample(const StreamInfo::StreamInfo& stream_info,

                              const absl::optional<SpanContext> parent_context,

                              const std::string& trace_id, const std::string& name,

                              OTelSpanKind spankind,

                              OptRef<const Tracing::TraceContext> trace_context,

                              const std::vector<SpanContext>& links) override;

  std::string getDescription() const override;

private:

};

} // namespace OpenTelemetry

} // namespace Tracers

} // namespace Extensions

} // namespace Envoy