/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#pragma once

#include <functional>
#include <mutex>

#include <react/renderer/mounting/MountingTransaction.h>
#include <react/renderer/telemetry/TransactionTelemetry.h>

namespace facebook::react {

class MountingCoordinator;

using MountingTransactionCallback =
    std::function<void(const MountingTransaction &transaction, const SurfaceTelemetry &surfaceTelemetry)>;

/*
 * Provides convenient tools for aggregating and accessing telemetry data
 * associated with running Surface.
 */
class TelemetryController final {
  friend class MountingCoordinator;

  /*
   * To be used by `MountingCoordinator`.
   */
  TelemetryController(const MountingCoordinator &mountingCoordinator) noexcept;

  /*
   * Not copyable.
   */
  TelemetryController(const TelemetryController &other) noexcept = delete;
  TelemetryController &operator=(const TelemetryController &other) noexcept = delete;

 public:
  /*
   * Calls `MountingCoordinator::pullTransaction()` and aggregates telemetry.
   */
  bool pullTransaction(
      const MountingTransactionCallback &willMount,
      const MountingTransactionCallback &doMount,
      const MountingTransactionCallback &didMount) const;

 private:
  const MountingCoordinator &mountingCoordinator_;
  mutable SurfaceTelemetry compoundTelemetry_{};
  mutable std::mutex mutex_;
};

} // namespace facebook::react