/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2020 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 AUDIOWAVEFORMVIEW_H
#define AUDIOWAVEFORMVIEW_H

#include <QtConcurrent/QtConcurrent>
#include <QWidget>

#include "audio/audiovisualwaveform.h"
#include "render/audioparams.h"
#include "render/audioplaybackcache.h"
#include "widget/timeruler/seekablewidget.h"

namespace olive {

class AudioWaveformView : public SeekableWidget
{
  Q_OBJECT
public:
  AudioWaveformView(QWidget* parent = nullptr);

  //void SetData(const QString& file, const AudioRenderingParams& params);

  void SetViewer(AudioPlaybackCache *playback);

protected:
  virtual void paintEvent(QPaintEvent* event) override;

private:
  struct CachedWaveformInfo {
    QSize size;
    double scale;
    int scroll;
    AudioParams params;

    bool operator==(const CachedWaveformInfo& rhs) const
    {
      return size == rhs.size
          && qFuzzyCompare(scale, rhs.scale)
          && scroll == rhs.scroll
          && params == rhs.params;
    }

    bool operator!=(const CachedWaveformInfo& rhs) const
    {
      return !(*this == rhs);
    }
  };

  struct ActiveCache {
    QPixmap pixmap;
    CachedWaveformInfo info;
    CachedWaveformInfo caching_info;
    QFutureWatcher<QPixmap>* watcher = nullptr;
  };

  QPixmap DrawWaveform(QIODevice *fs, CachedWaveformInfo info, int slice_start, int slice_end) const;

  AudioPlaybackCache *playback_;

  QVector<ActiveCache> cached_waveform_;

private slots:
  void BackendParamsChanged();

  void ForceUpdate();

  void ForceUpdateOfRange(const TimeRange& range);

  void BackgroundCacheFinished();

};

}

#endif // AUDIOWAVEFORMVIEW_H