/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2021 Olive Team

  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.

***/

#ifndef NODETRAVERSER_H
#define NODETRAVERSER_H

#include <QVector2D>

#include "codec/decoder.h"
#include "common/cancelableobject.h"
#include "node/output/track/track.h"
#include "render/job/footagejob.h"
#include "value.h"

namespace olive {

class NodeTraverser
{
public:
  NodeTraverser();

  NodeValueTable GenerateTable(const Node *n, const Node::ValueHint &hint, const TimeRange &range);

  NodeValueDatabase GenerateDatabase(const Node *node, const TimeRange &range);

  NodeValueRow GenerateRow(NodeValueDatabase *database, const Node *node, const TimeRange &range);
  NodeValueRow GenerateRow(const Node *node, const TimeRange &range);

  NodeValue GenerateRowValue(const Node *node, const QString &input, NodeValueTable *table);
  NodeValue GenerateRowValueElement(const Node *node, const QString &input, int element, NodeValueTable *table);
  NodeValue GenerateRowValueElement(const Node::ValueHint &hint, NodeValue::Type preferred_type, NodeValueTable *table);
  int GenerateRowValueElementIndex(const Node::ValueHint &hint, NodeValue::Type preferred_type, const NodeValueTable *table);
  int GenerateRowValueElementIndex(const Node *node, const QString &input, int element, const NodeValueTable *table);

  static NodeGlobals GenerateGlobals(const VideoParams &params, const TimeRange &time);
  static NodeGlobals GenerateGlobals(const VideoParams &params, const rational &time)
  {
    return GenerateGlobals(params, TimeRange(time, time + params.frame_rate_as_time_base()));
  }

  const VideoParams& GetCacheVideoParams() const
  {
    return video_params_;
  }

  void SetCacheVideoParams(const VideoParams& params)
  {
    video_params_ = params;
  }

  static int GetChannelCountFromJob(const GenerateJob& job);

protected:
  NodeValueTable ProcessInput(const Node *node, const QString &input, const TimeRange &range);

  virtual NodeValueTable GenerateBlockTable(const Track *track, const TimeRange& range);

  virtual TexturePtr ProcessVideoFootage(const FootageJob &stream, const rational &input_time);

  virtual SampleBufferPtr ProcessAudioFootage(const FootageJob &stream, const TimeRange &input_time);

  virtual TexturePtr ProcessShader(const Node *node, const TimeRange &range, ShaderJob& job);

  virtual SampleBufferPtr ProcessSamples(const Node *node, const TimeRange &range, const SampleJob &job);

  virtual TexturePtr ProcessFrameGeneration(const Node *node, const GenerateJob& job);

  virtual TexturePtr GetCachedTexture(const QByteArray& hash);

  virtual void SaveCachedTexture(const QByteArray& hash, TexturePtr texture);

  virtual bool CanCacheFrames()
  {
    return false;
  }

  QVector2D GenerateResolution() const;

  bool IsCancelled() const
  {
    return cancel_ && *cancel_;
  }

  const QAtomicInt *GetCancelPointer() const
  {
    return cancel_;
  }

  void SetCancelPointer(const QAtomicInt *cancel)
  {
    cancel_ = cancel;
  }

private:
  void PostProcessTable(const Node *node, const Node::ValueHint &hint, const TimeRange &range, NodeValueTable &output_params);

  TexturePtr CreateDummyTexture(const VideoParams &p);

  VideoParams video_params_;

  const QAtomicInt *cancel_;

};

}

#endif // NODETRAVERSER_H