// Copyright 2021 The Chromium 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 ASH_PROJECTOR_PROJECTOR_METADATA_CONTROLLER_H_
#define ASH_PROJECTOR_PROJECTOR_METADATA_CONTROLLER_H_

#include <memory>
#include <string>

#include "ash/ash_export.h"
#include "ash/projector/projector_metadata_model.h"
#include "base/memory/scoped_refptr.h"
#include "base/memory/weak_ptr.h"
#include "base/sequenced_task_runner.h"

namespace base {
class FilePath;
class TimeDelta;
}  // namespace base

namespace ash {

// The controller in charge of recording and saving screencast metadata.
class ASH_EXPORT ProjectorMetadataController {
 public:
  ProjectorMetadataController();
  ProjectorMetadataController(const ProjectorMetadataController&) = delete;
  ProjectorMetadataController& operator=(const ProjectorMetadataController&) =
      delete;
  virtual ~ProjectorMetadataController();

  // Invoked when recording is started to create a new instance of metadata
  // model. Virtual for testing.
  virtual void OnRecordingStarted();
  // Records the transcript in metadata. Virtual for testing.
  virtual void RecordTranscription(
      const std::string& transcription,
      const base::TimeDelta start_time,
      const base::TimeDelta end_time,
      const std::vector<base::TimeDelta>& word_alignments);
  // Marks the next transcript as the beginning of a key idea.
  // Virtual for testing.
  virtual void RecordKeyIdea();
  // Serializes the metadata and saves in storage. Virtual for testing.
  virtual void SaveMetadata(const base::FilePath& video_file_path);

  void SetProjectorMetadataModelForTest(
      std::unique_ptr<ProjectorMetadata> metadata);

 private:
  std::unique_ptr<ProjectorMetadata> metadata_;

  // A blocking task runner for file IO operations.
  scoped_refptr<base::SequencedTaskRunner> blocking_task_runner_;
  base::WeakPtrFactory<ProjectorMetadataController> weak_factory_{this};
};

}  // namespace ash

#endif  // ASH_PROJECTOR_PROJECTOR_METADATA_CONTROLLER_H_