#pragma once

#include "envoy/common/pure.h"

#include "absl/status/statusor.h"

namespace Envoy {

namespace Extensions {

namespace ResourceMonitors {

namespace CpuUtilizationMonitor {

class CpuStatsReader {

public:

  /**

   * Update CPU statistics and calculate current utilization.

   * Each implementation tracks its own previous state internally and

   * performs implementation-specific calculation logic.

   * @return StatusOr containing utilization value (0.0 to 1.0) on success,

   *         or InvalidArgumentError if calculation fails.

   */

  virtual absl::StatusOr<double> getUtilization() PURE;

};

} // namespace CpuUtilizationMonitor

} // namespace ResourceMonitors

} // namespace Extensions

} // namespace Envoy