// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COBALT_SRC_PB_METADATA_BUILDER_H_
#define COBALT_SRC_PB_METADATA_BUILDER_H_

#include "src/lib/util/clock.h"
#include "src/lib/util/consistent_proto_store.h"
#include "src/lib/util/protected_fields.h"
#include "src/logger/project_context.h"
#include "src/pb/observation_batch.pb.h"
#include "src/pb/system_data_history.pb.h"
#include "src/registry/metric_definition.pb.h"
#include "src/registry/report_definition.pb.h"
#include "src/system_data/system_data.h"

namespace cobalt {

class MetadataBuilder {
 public:
  MetadataBuilder(system_data::SystemDataInterface *system_data,
                  std::string system_profile_cache_dir, util::FileSystem *fs)
      : MetadataBuilder(system_data, nullptr, std::move(system_profile_cache_dir), fs) {}

  MetadataBuilder(system_data::SystemDataInterface *system_data,
                  util::ValidatedClockInterface *validated_clock,
                  std::string system_profile_cache_dir, util::FileSystem *fs);

  [[nodiscard]] std::unique_ptr<ObservationMetadata> Build(const logger::MetricRef &metric,
                                                           const ReportDefinition &report,
                                                           uint32_t day_index,
                                                           uint32_t hour_id) const;

  void SnapshotSystemData();
  void CleanupBefore(std::chrono::hours hours_ago);

 private:
  void FilteredSystemProfile(const ReportDefinition &report, SystemProfile *profile_out) const;

  static void FilteredSystemProfile(const ReportDefinition &report, const SystemProfile &profile_in,
                                    SystemProfile *profile_out);

  void WriteHistory(util::ProtectedFields<SystemProfileHistory>::LockedFieldsPtr history);

  util::ProtectedFields<SystemProfileHistory> system_profile_history_;

  system_data::SystemDataInterface *system_data_;
  std::unique_ptr<util::AlwaysAccurateClock> owned_clock_;
  util::ValidatedClockInterface *validated_clock_;
  std::unique_ptr<util::ConsistentProtoStore> history_store_;
};

}  // namespace cobalt

#endif  // COBALT_SRC_PB_METADATA_BUILDER_H_