/**
 * @RDE_HEADER@
 * An Image Editor which shows an Image, and emits a signal when clicked (to edit/swap an Image)
 * $Id$
 * $HeadURL$
 * $Author$
 *
 * Created by Mike Wille, SLSE, 2016-09-19
 */

#include "lts_image_editor.h"

#include <QPainter>
#include <QPaintEvent>
#include <QBrush>
#include <QPen>
#include <QRect>
#include <QEvent>

using namespace LtsWidgets;


LtsImageEditor::LtsImageEditor(QWidget *parent)
  : QWidget(parent)
  , m_isHovered(false)
  , m_menuEnabled(true) // enabled by default
  , m_bDrawOuterRect(true)
{}


void LtsImageEditor::setPixmap(const QPixmap &pixmap)
{
  if (pixmap.isNull()) // invalid / empty pixmap given, trying to replace it with one from lts_resources
    m_pixmap = QPixmap(QStringLiteral(":style/noimage.png")); // when this fails, the pixmap is still invalid, so no checks needed   TODO: add noimage.png !
  else
    m_pixmap = pixmap;

  update();
  emit imageChanged();
}


void LtsImageEditor::enterEvent(QEvent *)
{
  //qWarning() << "enter";
  m_isHovered = true;
  update();
}


void LtsImageEditor::leaveEvent(QEvent *)
{
  //qWarning() << "leave";
  m_isHovered = false;
  update();
}


bool LtsImageEditor::event(QEvent *event)
{
  if (event->type() == QEvent::MouseButtonPress && m_menuEnabled)
  {
    emit signalClicked();
    event->accept();
    m_isHovered = false; // unhovered on click
    update();
    return true;
  }

  return QWidget::event(event); // otherwise..
}


void LtsImageEditor::paintEvent(QPaintEvent* event) // TODO: colors from palette (style plugin) ?
{
  QPainter p(this);

  // draw profile picture
  p.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
  QBrush brush = QColor(QStringLiteral("white")); // TODO: get from palette


  if (!m_pixmap.isNull())
  {
    if (!(m_isHovered && m_menuEnabled)) // draw if NOT hovered or draw when hovered but menu is disabled
    {
      const QSize s(size());
      const QPixmap pixmap(m_pixmap.scaled(s, Qt::KeepAspectRatio, Qt::SmoothTransformation));
      const int x = qRound((s.width() - pixmap.width()) / 2.);
      const int y = qRound((s.height() - pixmap.height()) / 2.);
      if (m_bDrawOuterRect)
      {
        p.setPen(QPen(QColor("gray"), 2));
        p.drawRect(rect());
      }
      p.drawPixmap(x, y, pixmap);
      event->accept();
      return;
    }
  }


  // draw frame
  p.setPen(QPen(QColor("gray"), 2));
  p.setBrush(brush);
  p.drawRect(rect());


  // draw menu icon
  if (m_isHovered && m_menuEnabled)
  {
    p.setPen(QPen(QColor(QStringLiteral("gray")), (size().height() / 48 * 2))); // respect height, width is unnecessary

    double xc = size().width()/2.012;
    double yc = size().height()/2.012;

    p.drawLine(QPointF(xc - (xc/2.01f), yc - (yc/3.01f)), QPointF(xc + (xc/2.02f), yc - (yc/3.02f)));
    p.drawLine(QPointF(xc - (xc/2.01f), yc - 0.01f),      QPointF(xc + (xc/2.02f), yc - 0));
    p.drawLine(QPointF(xc - (xc/2.01f), yc + (yc/3.01f)), QPointF(xc + (xc/2.02f), yc + (yc/3.02f)));
  }

  event->accept();
}