#ifndef THIRD_PARTY_MILOTIC_EXTERNAL_CC_HFT_ADAPTER_DATA_SOURCE_H_
#define THIRD_PARTY_MILOTIC_EXTERNAL_CC_HFT_ADAPTER_DATA_SOURCE_H_

#include <memory>
#include <vector>

#include "absl/status/status.h"
#include "absl/status/statusor.h"
#include "absl/time/time.h"
#include "identifier.pb.h"
#include "payload.pb.h"
#include "subscription_params.pb.h"

namespace milotic_hft {

class DataSource {
 public:
  virtual ~DataSource() = default;

  // Configures the data source for the given `identifier` with the given
  // `sampling_interval_ms`.
  // `max_buffer_size` is the maximum number of readings that the data source
  // should buffer.
  // Returns an error if the data source cannot be configured.
  virtual absl::Status ConfigureSamplingInterval(const Identifier& identifier,
                                                 int sampling_interval_ms) = 0;

  // Configures the data source for the given `identifier` with the given
  // `max_batch_size`.
  // Returns an error if the data source cannot be configured.
  virtual absl::Status ConfigureBatchSize(const Identifier& identifier,
                                          int max_batch_size) = 0;

  // Resets the data source to the default configuration for the given
  // `identifier`.
  virtual absl::Status ResetSamplingIntervalToDefault(
      const Identifier& identifier) = 0;

  // Resets the batch size to the default configuration for the given
  // `identifier`.
  virtual absl::Status ResetBatchSizeToDefault(
      const Identifier& identifier) = 0;

  // Collects the data from the data source for the given `identifier` since the
  // `start_time`.
  // Returns an error if the data source is cannot serve the data.
  virtual absl::StatusOr<Payload> Collect(const Identifier& identifier,
                                          absl::Time start_time) const = 0;

  virtual absl::StatusOr<std::vector<Identifier>> GetIdentifiersForResourceType(
      const SubscriptionPolicy::ResourceType& resource_type) const = 0;
};

}  // namespace milotic_hft

#endif  // THIRD_PARTY_MILOTIC_EXTERNAL_CC_HFT_ADAPTER_DATA_SOURCE_H_