#include "tregionprop.h"
#include "tstroke.h"
#include "tregion.h"
//#include "tcurves.h"
//#include "tgl.h"
//#include "tcolorfunctions.h"
#include "tmathutil.h"
#include "drawutil.h"
#include "tvectorrenderdata.h"
//#include "tcolorstyles.h"
#include "tsimplecolorstyles.h"
//#include "tcurveutil.h"
//#include "tdebugmessage.h"
//#include "tflash.h"

#ifndef _WIN32
#define CALLBACK
#endif

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

TRegionProp::TRegionProp(const TRegion *region)
	: m_region(region), m_regionChanged(true)
{
}

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

//===================================================================
namespace
{

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

bool computeOutline(const TRegion *region,
					TRegionOutline::PointVector &polyline,
					const double pixelSize)
{
	bool doAntialiasing = false;
	polyline.clear();

	vector<TPointD> polyline2d;
	vector<int> indices;

	int i, edgeSize = region->getEdgeCount(), oldSize = 0;
	for (i = 0; i < edgeSize; i++) {
		TEdge &edge = *region->getEdge(i);

		if (edge.m_index >= 0 && edge.m_s) {
			bool outline = (edge.m_s->getAverageThickness() == 0.0);
			if (outline && !doAntialiasing) {
				//The region must be antialiased if it has at least one invisible (0-thin) edge
				doAntialiasing = true;

				//Plus, edges will have to be reproduced independently from the edge side
				indices.reserve(edgeSize);
			}

			if (outline && (edge.m_w0 > edge.m_w1)) {
				int newSize = polyline2d.size();
				if (oldSize < newSize) {
					//There is a sequence of forward vertices
					indices.push_back(newSize - oldSize);
					oldSize = newSize;
				}

				stroke2polyline(polyline2d, *edge.m_s, pixelSize, edge.m_w1, edge.m_w0, true);

				//Insert the sequence of backward vertices
				newSize = polyline2d.size();
				indices.push_back(oldSize - newSize);
				oldSize = newSize;
			} else
				stroke2polyline(polyline2d, *edge.m_s, pixelSize, edge.m_w0, edge.m_w1);
		}
	}

	//Copy points to the output
	int pointNumber = polyline2d.size();
	polyline.reserve(pointNumber);

	int j, k, l, indicesCount = indices.size();
	for (i = 0, k = 0; k < indicesCount; ++k) {
		l = indices[k];
		if (l == 0)
			continue;

		if (l > 0) {
			l = i + l;
			for (j = i; j < l; ++j)
				polyline.push_back(T3DPointD(polyline2d[j], 0.0));
			i = l;
		} else {
			l = i - l;
			j = l - 1;

			//Inverted sequences are symmetric by construction.
			//If necessary, chop the last element.
			if (polyline2d[i] == polyline2d[j])
				++i;

			for (; j >= i; --j)
				polyline.push_back(T3DPointD(polyline2d[j], 0.0));
			i = l;
		}
	}

	//Finally, copy the remaining (forward) ones
	for (; i < pointNumber; ++i)
		polyline.push_back(T3DPointD(polyline2d[i], 0.0));

	return doAntialiasing;
}

/*!
 This function accept a polygon which can have autointersections, 
 and creates a number of not-autointersecting polygons. the second function is for recursive calls.
 It is used for The GlTessellator
*/
//-------------------------------------------------------------------

//-------------------------------------------------------------------
} //end namaspace
//-------------------------------------------------------------------

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

void OutlineRegionProp::computeRegionOutline()
{
	int subRegionNumber = getRegion()->getSubregionCount();
	TRegionOutline::PointVector app;

	m_outline.m_exterior.clear();

	computeOutline(getRegion(), app, m_pixelSize);
	m_outline.m_doAntialiasing = true;

	m_outline.m_exterior.push_back(app);
	m_outline.m_interior.clear();
	m_outline.m_interior.reserve(subRegionNumber);
	for (int i = 0; i < subRegionNumber; i++) {
		app.clear();
		computeOutline(getRegion()->getSubregion(i), app, m_pixelSize);
		m_outline.m_doAntialiasing = true;
		m_outline.m_interior.push_back(app);
	}

	m_outline.m_bbox = getRegion()->getBBox();
}

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

OutlineRegionProp::OutlineRegionProp(const TRegion *region, const TOutlineStyleP colorStyle)
	: TRegionProp(region), m_pixelSize(0), m_colorStyle(colorStyle)
{
	m_styleVersionNumber = m_colorStyle->getVersionNumber();
}

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

void OutlineRegionProp::draw(const TVectorRenderData &rd)
{
	if (rd.m_clippingRect != TRect() && !rd.m_is3dView && !(rd.m_aff * getRegion()->getBBox()).overlaps(convert(rd.m_clippingRect)))
		return;

	glPushMatrix();
	tglMultMatrix(rd.m_aff);
	double pixelSize = sqrt(tglGetPixelSize2());

	if (!isAlmostZero(pixelSize - m_pixelSize, 1e-5) ||
		m_regionChanged ||
		m_styleVersionNumber != m_colorStyle->getVersionNumber()) {
		m_pixelSize = pixelSize;
		m_regionChanged = false;
		computeRegionOutline();
		TOutlineStyle::RegionOutlineModifier *modifier = m_colorStyle->getRegionOutlineModifier();
		if (modifier)
			modifier->modify(m_outline);

		m_styleVersionNumber = m_colorStyle->getVersionNumber();
	}

	assert(!m_outline.m_exterior.empty());

	m_colorStyle->drawRegion(rd.m_cf,
							 rd.m_antiAliasing && rd.m_regionAntialias,
							 m_outline);

	glPopMatrix();
}

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

TRegionProp *OutlineRegionProp::clone(const TRegion *region) const
{
	OutlineRegionProp *prop = new OutlineRegionProp(region, m_colorStyle);
	prop->m_regionChanged = m_regionChanged;
	prop->m_pixelSize = m_pixelSize;
	prop->m_outline = m_outline;
	return prop;
}

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

const TColorStyle *OutlineRegionProp::getColorStyle() const
{
	return m_colorStyle.getPointer();
}

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

void OutlineRegionProp::draw(TFlash &flash)
{
	m_colorStyle->drawRegion(flash, getRegion());

	/*

//flash.setColor(m_colorStyle->getMainColor());
m_colorStyle->setFill(flash);

//rd.setTexture(m_colorStyle->getMainColor());

for (i=0; i<(int)r->getEdgeCount(); i++)
	computeQuadChain(*r->getEdge(i), quadArray, toBeDeleted);

flash.drawPolygon(quadArray);
clearPointerContainer(toBeDeleted);
*/
}