/* This file is part of Clementine.
   Copyright 2012, David Sansome <me@davidsansome.com>

   Strawberry 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.

   Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef MOODBARITEMDELEGATE_H
#define MOODBARITEMDELEGATE_H

#include "moodbarrenderer.h"

#include <QObject>
#include <QItemDelegate>
#include <QCache>
#include <QFuture>
#include <QSet>
#include <QByteArray>
#include <QString>
#include <QUrl>
#include <QImage>
#include <QPixmap>
#include <QSize>
#include <QStyleOption>

class QPainter;
class QModelIndex;
class QPersistentModelIndex;
class Application;
class MoodbarPipeline;
class PlaylistView;

class MoodbarItemDelegate : public QItemDelegate {
  Q_OBJECT

 public:
  explicit MoodbarItemDelegate(Application *app, PlaylistView *view, QObject *parent = nullptr);

  void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &idx) const override;

 private slots:
  void ReloadSettings();

  void DataLoaded(const QUrl &url, MoodbarPipeline *pipeline);
  void ColorsLoaded(const QUrl &url, QFuture<ColorVector> future);
  void ImageLoaded(const QUrl &url, QFuture<QImage> future);

 private:
  struct Data {
    Data();

    enum State {
      State_None,
      State_CannotLoad,
      State_LoadingData,
      State_LoadingColors,
      State_LoadingImage,
      State_Loaded
    };

    QSet<QPersistentModelIndex> indexes_;

    State state_;
    ColorVector colors_;
    QSize desired_size_;
    QPixmap pixmap_;
  };

 private:
  QPixmap PixmapForIndex(const QModelIndex &idx, const QSize &size);
  void StartLoadingData(const QUrl &url, Data *data);
  void StartLoadingColors(const QUrl &url, const QByteArray &bytes, Data *data);
  void StartLoadingImage(const QUrl &url, Data *data);

  bool RemoveFromCacheIfIndexesInvalid(const QUrl &url, Data *data);

  void ReloadAllColors();

 private:
  Application *app_;
  PlaylistView *view_;
  QCache<QUrl, Data> data_;

  bool enabled_;
  MoodbarRenderer::MoodbarStyle style_;
};

#endif  // MOODBARITEMDELEGATE_H