#include "toonzqt/planeviewer.h"

// TnzQt includes
#include "toonzqt/imageutils.h"

// TnzLib includes
#include "toonz/stage.h"

// TnzCore includes
#include "trasterimage.h"
#include "ttoonzimage.h"
#include "tvectorimage.h"
#include "trop.h"
#include "tvectorrenderdata.h"
#include "tgl.h"
#include "tvectorgl.h"
#include "tpalette.h"

// Qt includes
#include <QMouseEvent>
#include <QWheelEvent>
#include <QResizeEvent>
#include <QHideEvent>

//#define PRINT_AFF

//**********************************************************************************
//    Local namespace  stuff
//**********************************************************************************

namespace
{

struct PlaneViewerZoomer : public ImageUtils::ShortcutZoomer {
	PlaneViewerZoomer(PlaneViewer *planeViewer)
		: ShortcutZoomer(planeViewer) {}

private:
	virtual bool zoom(bool zoomin, bool resetZoom);
};

//========================================================================

bool PlaneViewerZoomer::zoom(bool zoomin, bool resetZoom)
{
	PlaneViewer &planeViewer = static_cast<PlaneViewer &>(*getWidget());

	resetZoom ? planeViewer.resetView() : zoomin ? planeViewer.zoomIn() : planeViewer.zoomOut();

	return true;
}

} // namespace

//=========================================================================================

PlaneViewer::PlaneViewer(QWidget *parent)
	: QOpenGLWidget(parent)
	, m_firstResize(true)
	, m_xpos(0)
	, m_ypos(0)
	, m_aff() // initialized at the first resize
	, m_chessSize(40.0)
{
	m_zoomRange[0] = 1e-3, m_zoomRange[1] = 1024.0;
	setBgColor(TPixel32(235, 235, 235), TPixel32(235, 235, 235));
}

//=========================================================================================

void PlaneViewer::setZoomRange(double zoomMin, double zoomMax)
{
	m_zoomRange[0] = zoomMin, m_zoomRange[1] = zoomMax;
}

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

void PlaneViewer::setBgColor(const TPixel32 &color1, const TPixel32 &color2)
{
	m_bgColorF[0] = color1.r / 255.0, m_bgColorF[1] = color1.g / 255.0, m_bgColorF[2] = color1.b / 255.0;
	m_bgColorF[3] = color2.r / 255.0, m_bgColorF[4] = color2.g / 255.0, m_bgColorF[5] = color2.b / 255.0;
}

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

void PlaneViewer::getBgColor(TPixel32 &color1, TPixel32 &color2) const
{
	color1.r = m_bgColorF[0] * 255.0, color1.g = m_bgColorF[1] * 255.0, color1.b = m_bgColorF[2] * 255.0;
	color2.r = m_bgColorF[3] * 255.0, color2.g = m_bgColorF[4] * 255.0, color2.b = m_bgColorF[5] * 255.0;
}

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

void PlaneViewer::drawBackground()
{
	glClearColor(m_bgColorF[0], m_bgColorF[1], m_bgColorF[2], 1.0);
	glClear(GL_COLOR_BUFFER_BIT);

	if (m_bgColorF[0] != m_bgColorF[3] ||
		m_bgColorF[1] != m_bgColorF[4] ||
		m_bgColorF[2] != m_bgColorF[5]) {
		//Cast the widget rect to world rect
		TRectD rect(winToWorld(0, 0), winToWorld(width(), height()));

		//Deduce chess geometry
		TRect chessRect(
			tfloor(rect.x0 / m_chessSize), tfloor(rect.y0 / m_chessSize),
			tceil(rect.x1 / m_chessSize), tceil(rect.y1 / m_chessSize));

		//Draw chess squares
		glColor3f(m_bgColorF[3], m_bgColorF[4], m_bgColorF[5]);
		glBegin(GL_QUADS);

		int x, y;
		TPointD pos;
		double chessSize2 = 2.0 * m_chessSize;

		for (y = chessRect.y0; y < chessRect.y1; ++y) {
			pos.y = y * m_chessSize;
			for (x = chessRect.x0 + ((chessRect.x0 + y) % 2), pos.x = x * m_chessSize;
				 x < chessRect.x1;
				 x += 2, pos.x += chessSize2) {
				glVertex2d(pos.x, pos.y);
				glVertex2d(pos.x + m_chessSize, pos.y);
				glVertex2d(pos.x + m_chessSize, pos.y + m_chessSize);
				glVertex2d(pos.x, pos.y + m_chessSize);
			}
		}

		glEnd();
	}
}

//=========================================================================================

void PlaneViewer::initializeGL()
{
}

void PlaneViewer::resizeGL(int width, int height)
{
	glViewport(0, 0, width, height);

	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
	gluOrtho2D(0, width, 0, height);

	glMatrixMode(GL_MODELVIEW);
	glLoadIdentity();

	if (m_firstResize) {
		m_firstResize = false;
		m_aff = TTranslation(0.5 * width, 0.5 * height);
		m_width = width;
		m_height = height;
	}
	else {
		TPointD oldCenter(m_width * 0.5, m_height * 0.5);
		TPointD newCenter(width * 0.5, height * 0.5);

		m_aff = m_aff.place(m_aff.inv() * oldCenter, newCenter);
		m_width = width;
		m_height = height;
	}
}

//=========================================================================================

void PlaneViewer::mouseMoveEvent(QMouseEvent *event)
{
	if (event->buttons() & Qt::MidButton)
		moveView(event->x() - m_xpos, height() - event->y() - m_ypos);

	m_xpos = event->x(), m_ypos = height() - event->y();
}

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

void PlaneViewer::mousePressEvent(QMouseEvent *event)
{
	m_xpos = event->x(), m_ypos = height() - event->y();
}

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

void PlaneViewer::wheelEvent(QWheelEvent *event)
{
	TPointD pos(event->x(), height() - event->y());
	double zoom_par = 1 + event->delta() * 0.001;

	zoomView(pos.x, pos.y, zoom_par);
}

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

void PlaneViewer::keyPressEvent(QKeyEvent *event)
{
	if (PlaneViewerZoomer(this).exec(event))
		return;

	QOpenGLWidget::keyPressEvent(event);
}

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

//! Disposes of the auxiliary internal rasterBuffer().
void PlaneViewer::hideEvent(QHideEvent *event)
{
	m_rasterBuffer = TRaster32P();
}

//=========================================================================================

void PlaneViewer::resetView()
{
	m_aff = TTranslation(0.5 * width(), 0.5 * height());
	update();
}

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

void PlaneViewer::setViewPos(double x, double y)
{
	m_aff.a13 = x, m_aff.a23 = y;
	update();

#ifdef PRINT_AFF
	qDebug("zoom = %.4f;  pos = %.4f, %.4f", m_aff.a11, m_aff.a13, m_aff.a23);
#endif
}

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

void PlaneViewer::setViewZoom(double x, double y, double zoom)
{
	zoom = tcrop(zoom, m_zoomRange[0], m_zoomRange[1]);
	double delta = zoom / m_aff.a11;

	m_aff.a13 = x + delta * (m_aff.a13 - x);
	m_aff.a23 = y + delta * (m_aff.a23 - y);
	m_aff.a11 = m_aff.a22 = zoom;

	update();

#ifdef PRINT_AFF
	qDebug("zoom = %.4f;  pos = %.4f, %.4f", m_aff.a11, m_aff.a13, m_aff.a23);
#endif
}

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

void PlaneViewer::zoomIn()
{
	setViewZoom(ImageUtils::getQuantizedZoomFactor(m_aff.a11, true));
}

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

void PlaneViewer::zoomOut()
{
	setViewZoom(ImageUtils::getQuantizedZoomFactor(m_aff.a11, false));
}

//=========================================================================================

void PlaneViewer::pushGLWorldCoordinates()
{
	m_matrix[0] = m_aff.a11;
	m_matrix[4] = m_aff.a12;
	m_matrix[12] = m_aff.a13;
	m_matrix[1] = m_aff.a21;
	m_matrix[5] = m_aff.a22;
	m_matrix[13] = m_aff.a23;

	m_matrix[2] = m_matrix[3] = m_matrix[6] = m_matrix[7] = m_matrix[8] = m_matrix[9] =
		m_matrix[10] = m_matrix[11] = m_matrix[14] = 0;

	m_matrix[15] = 1.0;

	glPushMatrix();
	glLoadMatrixd(m_matrix); //(GLdouble*) &m_matrix
}

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

void PlaneViewer::pushGLWinCoordinates()
{
	glPushMatrix();
	glLoadIdentity();
}

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

void PlaneViewer::popGLCoordinates()
{
	glPopMatrix();
}

//=========================================================================================

TRaster32P PlaneViewer::rasterBuffer()
{
	if (!m_rasterBuffer || m_rasterBuffer->getLx() != width() || m_rasterBuffer->getLy() != height())
		m_rasterBuffer = TRaster32P(width(), height());

	return m_rasterBuffer;
}

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

void PlaneViewer::flushRasterBuffer()
{
	assert(m_rasterBuffer);

	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
	glRasterPos2d(0, 0);
	glDrawPixels(width(), height(),
				 TGL_FMT, TGL_TYPE, m_rasterBuffer->getRawData());
}

//=========================================================================================

void PlaneViewer::draw(TRasterP ras, double dpiX, double dpiY, TPalette *pal)
{
	TPointD rasCenter(ras->getCenterD());

	TRaster32P aux(rasterBuffer());

	aux->lock();
	ras->lock();

	glGetDoublev(GL_MODELVIEW_MATRIX, m_matrix);
	TAffine viewAff(
		m_matrix[0], m_matrix[4], m_matrix[12],
		m_matrix[1], m_matrix[5], m_matrix[13]);
	viewAff = viewAff * TScale(Stage::inch / dpiX, Stage::inch / dpiY) * TTranslation(-rasCenter);

	pushGLWinCoordinates();

	aux->clear();
	if (pal)
		TRop::quickPut(aux, (TRasterCM32P)ras, pal, viewAff);
	else
		TRop::quickPut(aux, ras, viewAff);

	flushRasterBuffer();
	popGLCoordinates();
}

/*NOTE:
    glRasterPos2d could be used, along glBitmap and glPixelZoom...
    however, i've never been able to use them effectively...
*/

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

void PlaneViewer::draw(TRasterImageP ri)
{
	double dpiX, dpiY;
	ri->getDpi(dpiX, dpiY);

	if (dpiX == 0.0 || dpiY == 0.0)
		dpiX = dpiY = Stage::inch;

	draw(ri->getRaster(), dpiX, dpiY);
}

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

void PlaneViewer::draw(TToonzImageP ti)
{
	double dpiX, dpiY;
	ti->getDpi(dpiX, dpiY);

	if (dpiX == 0.0 || dpiY == 0.0)
		dpiX = dpiY = Stage::inch;

	draw(ti->getRaster(), dpiX, dpiY, ti->getPalette());
}

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

void PlaneViewer::draw(TVectorImageP vi)
{
	TRectD bbox(vi->getBBox());
	TRect bboxI(tfloor(bbox.x0), tfloor(bbox.y0), tceil(bbox.x1) - 1, tceil(bbox.y1) - 1);

	TVectorRenderData rd(TAffine(), bboxI, vi->getPalette(), 0, true, true);
	tglDraw(rd, vi.getPointer());
}

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

void PlaneViewer::draw(TImageP img)
{
	{
		TRasterImageP ri(img);
		if (ri) {
			draw(ri);
			return;
		}
	}
	{
		TToonzImageP ti(img);
		if (ti) {
			draw(ti);
			return;
		}
	}
	{
		TVectorImageP vi(img);
		if (vi) {
			draw(vi);
			return;
		}
	}
}