#include "tcommon.h"

#include "toonzqt/pickrgbutils.h"

#include "toonzqt/screenboard.h"

#include "toonzqt/menubarcommand.h"

#include "tools/RGBpicker.h"

#include "tools/cursors.h"

#include "tools/cursormanager.h"

#include <qmouseevent></qmouseevent>

#include <qpaintevent></qpaintevent>

#include <qpainter></qpainter>

#include <qcoreapplication></qcoreapplication>

#include <qcursor></qcursor>

#include <qtimer></qtimer>

#include "tools/screenpicker.h"

//***********************************************************************************

//    Screen Picker implementation

//***********************************************************************************

ScreenPicker::ScreenPicker(QWidget *parent)

    : m_mousePressed(false), m_mouseGrabbed(false) {}

//------------------------------------------------------------------

bool ScreenPicker::acceptScreenEvents(const QRect &screenRect) const {

  return screenRect.contains(QCursor::pos()) ||  // Accept mouse events

         screenRect.intersects(m_geometry);      // Accept paint events

}

//------------------------------------------------------------------

void ScreenPicker::event(QWidget *widget, QEvent *e) {

  switch (e->type()) {

  case QEvent::MouseButtonPress:

    mousePressEvent(widget, static_cast<qmouseevent *="">(e));</qmouseevent>

    break;

  case QEvent::MouseMove:

    mouseMoveEvent(widget, static_cast<qmouseevent *="">(e));</qmouseevent>

    break;

  case QEvent::MouseButtonRelease:

    mouseReleaseEvent(widget, static_cast<qmouseevent *="">(e));</qmouseevent>

  };

}

//------------------------------------------------------------------

void ScreenPicker::mousePressEvent(QWidget *widget, QMouseEvent *me) {

  m_mousePressed = true;

  m_start        = widget->mapToGlobal(me->pos());

  m_geometry = QRect(m_start, QSize(1, 1));

  DVGui::ScreenBoard::instance()->update();

}

//------------------------------------------------------------------

void ScreenPicker::mouseMoveEvent(QWidget *widget, QMouseEvent *me) {

  // On fast movements, the mouse release can fire before the mouse movement

  // assert(m_mouseGrabbed); - can cause a crash

  if (!m_mousePressed || !m_mouseGrabbed) return;

  QPoint pos(widget->mapToGlobal(me->pos()));

  m_geometry = QRect(QRect(m_start, QSize(1, 1)) | QRect(pos, QSize(1, 1)));

  DVGui::ScreenBoard::instance()->update();

}

//------------------------------------------------------------------

void ScreenPicker::mouseReleaseEvent(QWidget *widget, QMouseEvent *me) {

  assert(m_mouseGrabbed);

  if (!m_mousePressed) return;

  m_mouseGrabbed = m_mousePressed = false;

  DVGui::ScreenBoard *screenBoard = DVGui::ScreenBoard::instance();

  QList<dvgui::screenboard::drawing *=""> &drawings = screenBoard->drawings();</dvgui::screenboard::drawing>

  drawings.removeAt(drawings.indexOf(this));

  screenBoard->releaseMouse();

  screenBoard->update();

  QPoint pos(widget->mapToGlobal(me->pos()));

  m_geometry = QRect(QRect(m_start, QSize(1, 1)) | QRect(pos, QSize(1, 1)));

  // TimerEvents execution is delayed until all other events have been

  // processed.

  // In particular, we want to pick after the screen refreshes

  QTimer::singleShot(0, this, SLOT(pick()));

}

//------------------------------------------------------------------

void ScreenPicker::pick() {

  // Someway, on MACOSX 10.7 (Lion) there may be screen refresh events pending

  // at this point.

  // Process them before picking.

  QCoreApplication::processEvents();

  QColor color(pickScreenRGB(m_geometry));

  RGBPicker::setCurrentColorWithUndo(

      TPixel32(color.red(), color.green(), color.blue()));

  m_geometry = QRect();

}

//------------------------------------------------------------------

void ScreenPicker::paintEvent(QWidget *widget, QPaintEvent *pe) {

  if (!m_mousePressed) return;

  QPainter painter(widget);

  QRect relativeGeom(widget->mapFromGlobal(m_geometry.topLeft()),

                     widget->mapFromGlobal(m_geometry.bottomRight()));

  painter.setPen(QColor(0, 0, 255, 128));

  painter.setBrush(QColor(0, 0, 255, 64));

  painter.drawRect(relativeGeom);

}

//------------------------------------------------------------------

void ScreenPicker::startGrab() {

  if (!m_mouseGrabbed) {

    m_mouseGrabbed = true;

    DVGui::ScreenBoard *screenBoard = DVGui::ScreenBoard::instance();

    screenBoard->drawings().push_back(this);

    screenBoard->grabMouse(getToolCursor(ToolCursor::PickerCursor));

    screenBoard->update();

  }

}

//***********************************************************************************

//    Pick Screen Command instantiation

//***********************************************************************************

class PickScreenCommandHandler final : public MenuItemHandler {

public:

  PickScreenCommandHandler(CommandId cmdId) : MenuItemHandler(cmdId) {}

  void execute() override {

    static ScreenPicker *picker = new ScreenPicker;

    picker->startGrab();

  }

} pickScreenCHInstance("A_ToolOption_PickScreen");