/*
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
#ifndef FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_
#define FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_

#include <memory>
#include <string>
#include <utility>

#include "fcp/client/engine/example_iterator_factory.h"
#include "fcp/client/log_manager.h"
#include "fcp/client/opstats/opstats_db.h"
#include "fcp/client/opstats/opstats_logger.h"
#include "fcp/client/simple_task_environment.h"
#include "fcp/protos/plan.pb.h"

namespace fcp {
namespace client {
namespace opstats {
inline static constexpr char kOpStatsCollectionUri[] = "internal:/opstats";
inline static constexpr char kPopulationName[] = "population_name";
inline static constexpr char kSessionName[] = "session_name";
inline static constexpr char kTaskName[] = "task_name";
inline static constexpr char kEventsEventType[] = "events-event_type";
inline static constexpr char kEventsTimestampMillis[] = "events-timestamp";
inline static constexpr char kDatasetStatsUri[] = "dataset_stats-uri";
inline static constexpr char kDatasetStatsNumExamplesRead[] =
    "dataset_stats-num_examples_read";
inline static constexpr char kDatasetStatsNumBytesRead[] =
    "dataset_stats-num_bytes_read";
inline static constexpr char kErrorMessage[] = "error_message";
inline static constexpr char kRetryWindowDelayMinMillis[] =
    "retry_window-delay_min";
inline static constexpr char kRetryWindowDelayMaxMillis[] =
    "retry_window-delay_max";
inline static constexpr char kChunkingLayerBytesDownloaded[] =
    "chunking_layer_bytes_downloaded";
inline static constexpr char kChunkingLayerBytesUploaded[] =
    "chunking_layer_bytes_uploaded";
inline static constexpr char kNetworkDuration[] = "network_duration";
inline static constexpr char kEarliestTrustWorthyTimeMillis[] =
    "earliest_trustworthy_time";

class OpStatsExampleIteratorFactory
    : public fcp::client::engine::ExampleIteratorFactory {
 public:
  OpStatsExampleIteratorFactory(
      OpStatsLogger* op_stats_logger, LogManager* log_manager,
      bool opstats_last_successful_contribution_criteria)
      : op_stats_logger_(op_stats_logger),
        log_manager_(log_manager),
        opstats_last_successful_contribution_criteria_(
            opstats_last_successful_contribution_criteria) {}

  bool CanHandle(const google::internal::federated::plan::ExampleSelector&
                     example_selector) override;

  bool ShouldCollectStats() override { return true; }

  absl::StatusOr<std::unique_ptr<ExampleIterator>> CreateExampleIterator(
      const google::internal::federated::plan::ExampleSelector&
          example_selector) override;

 private:
  OpStatsLogger* op_stats_logger_;
  LogManager* log_manager_;
  bool opstats_last_successful_contribution_criteria_;
};

}  // namespace opstats
}  // namespace client
}  // namespace fcp

#endif  // FCP_CLIENT_OPSTATS_OPSTATS_EXAMPLE_STORE_H_