#include "track_entry_previewer.h"
#include "track_entry.h"
#include "track_entry_painters.h"
#include "track_content_widget.h"

#include <QPainter>
#include <QDrag>
#include <QMimeData>
#include <QMouseEvent>


namespace LtsScriptTimeline
{
// only for dnd
QDataStream &operator<<(QDataStream &ds, const TrackEntry &te);
QDataStream &operator>>(QDataStream &ds, TrackEntry &te);

TrackEntryPreviewer::TrackEntryPreviewer(QWidget *parent)
  : QWidget(parent)
  , m_te(nullptr)
{
//  setMinimumSize(50, 50);
//  setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Maximum);
  setVisible(false);
}


TrackEntryPreviewer::~TrackEntryPreviewer()
{}


void TrackEntryPreviewer::setTrackEntry(TrackEntry *te)
{
  m_te = te;

  if (m_te->isSet) // is already set (no d&d)
    return;

  connect(m_te, &TrackEntry::destroyed,
          this, [this]()
  {
    m_te = nullptr;
    emit signalDelete();
  });
}


void TrackEntryPreviewer::mousePressEvent(QMouseEvent *event)
{
  // check if it's a drag + te exists
  if (!m_te || event->buttons() != Qt::LeftButton)
    return;

  m_te->isSet = true; // temporary !
  QByteArray itemData(TrackContentWidget::itemsToData({ m_te }, 0));
  m_te->isSet = false; // set back, so that THIS te is kept unset

  QMimeData *mimeData = new QMimeData;
  mimeData->setData(TrackContentWidget::mime, itemData);

  QDrag *drag = new QDrag(this);
  drag->setDragCursor(QPixmap(), Qt::CopyAction);
  drag->setMimeData(mimeData);

  emit signalStartDrag();

  if (drag->exec(Qt::CopyAction) == Qt::CopyAction) // exec... grr...
    emit signalDelete();

  emit signalStopDrag();
}


void TrackEntryPreviewer::paintEvent(QPaintEvent *event)
{
  QWidget::paintEvent(event);

  QPainter painter(this);

  if (!m_te)
    return;

  drawTrackEntry(m_te, painter, rect().adjusted(0, 0, -1, -1), false, isEnabled());
}

} // namespace LtsScriptTimeline