/**
  * @RDE_HEADER@
  * Background Widget that covers a monitor with the project image
  * $Id$
  * $HeadURL$
  * $Author$
  * Created by Mike Wille, SLSE, 2016-05-05
  */

#include "lts_background_widget.h"

#include <QPaintEvent>
#include <QPainter>
#include <QDebug>

#ifdef Q_OS_WIN
#include <QtPlatformHeaders/qwindowswindowfunctions.h>
#endif


namespace LtsWidgets
{

LtsBackgroundWidget::LtsBackgroundWidget(QWidget *parent)
  : QDialog(parent)
  , m_isUltraWide(false)
{
  setMouseTracking(true); // register mouse movement
  setWindowFlags(windowFlags() | Qt::FramelessWindowHint /*| Qt::WindowStaysOnBottomHint*/);
  setWindowTitle(QStringLiteral("Splash"));

  setBackground();
}


void LtsBackgroundWidget::setBackground()
{
  static const auto backgroundFiles =
  {
    QStringLiteral(":/project/background.png"),
    QStringLiteral(":/project/background.jpg"),
  };
  static const auto backgroundFilesWide =
  {
    QStringLiteral(":/project/background_wide.png"),
    QStringLiteral(":/project/background_wide.jpg"),
  };

  m_pixmap = QPixmap();
  for (const QString &f : m_isUltraWide ? backgroundFilesWide : backgroundFiles)
  {
    if (!QFile::exists(f))
      continue;
    m_pixmap = QPixmap(f);
    if (m_pixmap.isNull())
      continue;
    break;
  }

  if (m_pixmap.isNull())
  {
    if (m_isUltraWide)
    {
      m_isUltraWide = false;
      setBackground();
    }
    else
    {
      qWarning() << "BackgroundWidget::c_tor: file missing or is not a valid image ':/project/background.png'";
    }
  }
}


void LtsBackgroundWidget::setUltraWide(bool set)
{
  if (set == m_isUltraWide) // do not set / unset ultra wide if it's already set to specified state
    return;

  m_isUltraWide = set;
  setBackground();
  update(); // force redraw on next event loop
}


void LtsBackgroundWidget::resizeEvent(QResizeEvent *e)
{
  setUltraWide(width() > 3000);
  QDialog::resizeEvent(e);
}


void LtsBackgroundWidget::paintEvent(QPaintEvent *e)
{
  if (!m_pixmap.isNull())
  {
    QPainter painter(this);
    painter.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
    painter.drawPixmap(0, 0, width(), height(), m_pixmap); // draw project background on login splash
  }
  QDialog::paintEvent(e);
}


bool LtsBackgroundWidget::event(QEvent *e)
{
  if (e->type() == QEvent::KeyPress || // respect typing into textfields
      e->type() == QEvent::MouseButtonPress ||
      e->type() == QEvent::MouseButtonRelease ||
      e->type() == QEvent::MouseMove)
  {
    //qWarning() << "BGW operator action!";
    emit signalOperatorAction();
    e->ignore();
    return true;
  }

  return QDialog::event(e);
}


void LtsBackgroundWidget::showFullScreen()
{
  //qWarning() << "show fullscreen !";
#ifdef Q_OS_WIN
  winId();  // make sure windowHandle() is not a nullptr
  QWindowsWindowFunctions::setHasBorderInFullScreen(windowHandle(), true);
#endif
  QDialog::showFullScreen();
  raise(); // as this is a widget for the background, it has to be raised, but only once at startup
}


void LtsBackgroundWidget::closeEvent(QCloseEvent *e)
{
#ifdef DEVEL
  deleteLater();
#else
  e->ignore();
#endif
}

} // namespace LtsWidgets