#pragma once

#include <memory>

#include "envoy/common/pure.h"

#include "absl/types/optional.h"

namespace Envoy {

namespace Extensions {

namespace Common {

namespace Aws {

/**

 * Interface for classes capable of discovering the AWS region from the execution environment.

 */

class RegionProvider {

public:

  /**

   * Discover and return the AWS region.

   * @return AWS region, or nullopt if unable to discover the region.

   */

  virtual absl::optional<std::string> getRegion() PURE;

  /**

   * Discover and return the AWS region set string.

   * @return AWS region, or nullopt if unable to discover the region set.

   */

  virtual absl::optional<std::string> getRegionSet() PURE;

};

using RegionProviderPtr = std::unique_ptr<RegionProvider>;

using RegionProviderSharedPtr = std::shared_ptr<RegionProvider>;

} // namespace Aws

} // namespace Common

} // namespace Extensions

} // namespace Envoy