// Ryzom - MMORPG Framework <http://dev.ryzom.com/projects/ryzom/>
// Copyright (C) 2010  Winch Gate Property Limited
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

#include "stdpch.h"
#include "ctrl_polygon.h"
#include "view_renderer.h"
#include "interface_manager.h"
//
#include "nel/misc/vector_2f.h"


using namespace NLMISC;

//*********************************************************************************
CCtrlPolygon::CCtrlPolygon() : CCtrlBase(TCtorParam())
{
	// Construct
	_Color = CRGBA::White;
	//_Matrix = CMatrix::Identity;
	_Valid = true;
}

//*********************************************************************************
void CCtrlPolygon::updateBoudingRect()
{
	H_AUTO(Rz_CCtrlPolygon_updateBoudingRect)
	if (_Poly.Vertices.empty())
	{
		setX(0);
		setY(0);
		setW(0);
		setH(0);
		return;
	}
	//
	sint32 xmin = INT_MAX;
	sint32 ymin = INT_MAX;
	sint32 xmax = INT_MIN;
	sint32 ymax = INT_MIN;
	uint numVerts = (uint)_Poly.Vertices.size();
	_XFormPoly.Vertices.resize(numVerts);
	for(uint k = 0; k < numVerts; ++k)
	{
		CVector2f &finalPos = _XFormPoly.Vertices[k];
		//finalPos = _Matrix * _Poly.Vertices[k];
		computeScaledVertex(finalPos, CVector2f(_Poly.Vertices[k].x, _Poly.Vertices[k].y));
		xmin = std::min(xmin, (sint32) floorf(finalPos.x));
		xmax = std::max(xmax, (sint32) ceilf(finalPos.x));
		ymin = std::min(ymin, (sint32) floorf(finalPos.y));
		ymax = std::max(ymax, (sint32) ceilf(finalPos.y));
	}
	setX(xmin);
	setY(ymin);
	setW(xmax - xmin);
	setH(ymax - ymin);
}

//*********************************************************************************
bool CCtrlPolygon::contains(const CVector2f &pos) const
{
	H_AUTO(Rz_CCtrlPolygon_contains)
	if (!_Valid) return false;
	return _XFormPoly.contains(pos, false);
}

//*********************************************************************************
void CCtrlPolygon::setVertices(const std::vector<NLMISC::CVector> &vertices)
{
	H_AUTO(Rz_CCtrlPolygon_setVertices)
	if (vertices.size() == _Poly.Vertices.size() &&
		std::equal(vertices.begin(), vertices.end(), _Poly.Vertices.begin())) return; // remains unchanged


	//TTicks startTime = CTime::getPerformanceTime();

	_Poly.Vertices = vertices;
	_Tris.clear();
	std::list<CPolygon> polys;
	bool splitDone = _Poly.toConvexPolygons(polys, NLMISC::CMatrix::Identity);
	if (!splitDone)
	{
		polys.clear();
		// maybe wrong orientation
		std::reverse(_Poly.Vertices.begin(), _Poly.Vertices.end());
		splitDone = _Poly.toConvexPolygons(polys, NLMISC::CMatrix::Identity);
		std::reverse(_Poly.Vertices.begin(), _Poly.Vertices.end());
	}
	_Tris.clear();
	if (splitDone)
	{
		for(std::list<CPolygon>::iterator it = polys.begin(); it != polys.end(); ++it)
		{
			it->toTriFan(_Tris);
		}
	}
	_Touched = true;
	updateBoudingRect();
	_Valid = splitDone;

	//TTicks endTime = CTime::getPerformanceTime();		
	//nlinfo("%d ms for CCtrlPolygon::setVertices", (int) (1000 * CTime::ticksToSecond(endTime - startTime)));	
}


static inline bool totallyInside(const CVector &minCorner, const CVector &maxCorner, sint32 cx, sint32 cy, sint32 cw, sint32 ch)
{
	return (sint32) maxCorner.x < (cx + cw) &&
			(sint32) minCorner.x >= cx &&
			(sint32) maxCorner.y < (cy + ch) &&
			(sint32) minCorner.y >= cy;
}

static inline bool totallyOutside(const CVector &minCorner, const CVector &maxCorner, sint32 cx, sint32 cy, sint32 cw, sint32 ch)
{
	return (sint32) minCorner.x >= (cx + cw) ||
			(sint32) maxCorner.x < cx ||
			(sint32) minCorner.y >= (cy + ch) ||
			(sint32) maxCorner.y < cy;
}


//*********************************************************************************
/*void CCtrlPolygon::setMatrix(const NLMISC::CMatrix &mat)
{
	const float *lhs = mat.get();
	const float *rhs = _Matrix.get();
	if (std::equal(lhs, lhs + 16, rhs)) return; // unmodified...
	_Matrix = mat;
	updateBoudingRect();
	_Touched = true;
}*/


//*********************************************************************************
void CCtrlPolygon::draw()
{
	H_AUTO(Rz_CCtrlPolygon_draw)
	if (_Tris.empty()) return;
	if (!_Parent) return;
	CInterfaceManager *im = CInterfaceManager::getInstance();
	CViewRenderer &vr = im->getViewRenderer();
	if (_Touched)
	{
		_RealTris.clear();
		uint numTris = (uint)_Tris.size();
		sint32 cornerX, cornerY;
		static std::vector<NLMISC::CTriangle> winTris;
		winTris.resize(numTris);
		_Parent->getCorner(cornerX, cornerY, _ParentPosRef);
		/*CMatrix m = _Matrix;
		m.setPos(m.getPos() + CVector((float) cornerX, (float) cornerY, 0.f));*/
		for(uint k = 0; k < numTris; ++k)
		{
			/*winTris[k].V0 = m * _Tris[k].V0;
			winTris[k].V1 = m * _Tris[k].V1;
			winTris[k].V2 = m * _Tris[k].V2;*/

			CVector2f result;
			computeScaledVertex(result, _Tris[k].V0);
			winTris[k].V0.set(result.x + cornerX, result.y + cornerY, 0.f);
			computeScaledVertex(result, _Tris[k].V1);
			winTris[k].V1.set(result.x + cornerX, result.y + cornerY, 0.f);
			computeScaledVertex(result, _Tris[k].V2);
			winTris[k].V2.set(result.x + cornerX, result.y + cornerY, 0.f);
		}
		// recompute & reclip poly
		_RealTris.clear();
		sint32 cx, cy, cw, ch;
		vr.getClipWindow(cx, cy, cw, ch);
		// per tri clip
		NLMISC::CVector minCorner;
		NLMISC::CVector maxCorner;
		for(uint k = 0; k < numTris; ++k)
		{
			winTris[k].getMinCorner(minCorner);
			winTris[k].getMaxCorner(maxCorner);
			if (totallyOutside(minCorner, maxCorner, cx, cy, cw, ch)) continue;
			if (totallyInside(minCorner, maxCorner, cx, cy, cw, ch))
			{
				_RealTris.push_back(winTris[k]);
			}
			else
			{
				const uint maxNumCorners = 8;
				static CVector	outPos0[maxNumCorners];
				static CVector	outPos1[maxNumCorners];
				//
				outPos0[0] = winTris[k].V0;
				outPos0[1] = winTris[k].V1;
				outPos0[2] = winTris[k].V2;
				//
				CVector *pPos0 = outPos0;
				CVector *pPos1 = outPos1;
				//
				sint count = 3;
				//
				if ((sint32) minCorner.x < cx)
				{
					// clip left
					CPlane clipper(-1.f, 0.f, 0.f, (float) cx);
					count = clipper.clipPolygonBack(pPos0, pPos1, count);
					std::swap(pPos0, pPos1);
				}
				if ((sint32) maxCorner.x > cx + cw)
				{
					// clip right
					CPlane clipper(1.f, 0.f, 0.f, - (float) (cx + cw));
					count = clipper.clipPolygonBack(pPos0, pPos1, count);
					std::swap(pPos0, pPos1);
				}
				//
				if ((sint32) minCorner.y < cy)
				{
					// clip bottom
					CPlane clipper(0.f, -1.f, 0.f, (float) cy);
					count = clipper.clipPolygonBack(pPos0, pPos1, count);
					std::swap(pPos0, pPos1);
				}
				if ((sint32) maxCorner.y > cy + ch)
				{
					// clip top
					CPlane clipper(0.f, 1.f, 0.f, - (float) (cy + ch));
					count = clipper.clipPolygonBack(pPos0, pPos1, count);
					std::swap(pPos0, pPos1);
				}
				nlassert(count <= 8);
				if (count >= 3)
				{
					for(uint k = 0; k < (uint) (count - 2); ++k)
					{
						_RealTris.push_back(NLMISC::CTriangle(pPos0[0], pPos0[k + 1], pPos0[k + 2]));
					}
				}
			}
		}
		_Touched = false;
	}
	if (_RealTris.empty()) return;
	CRGBA col;
	if(getModulateGlobalColor())
	{
		col.modulateFromColor (_Color, im->getGlobalColorForContent());
	}
	else
	{
		col= _Color;
		col.A = (uint8)(((sint32)col.A*((sint32)im->getGlobalColorForContent().A+1))>>8);
	}
	vr.drawUnclippedTriangles(_RenderLayer, _RealTris, col);
}

//*********************************************************************************
void CCtrlPolygon::updateCoords()
{
	H_AUTO(Rz_CCtrlPolygon_updateCoords)
	CCtrlBase::updateCoords();
	updateBoudingRect();
	// assume that clipping will have to be done again, real update of triangle will be done at render time
	_Touched = true;
}

//*********************************************************************************
void CCtrlPolygon::setAlpha(sint32 a)
{
	H_AUTO(Rz_CCtrlPolygon_setAlpha)
	_Color.A = (uint8) a;
}

//*********************************************************************************
bool CCtrlPolygon::handleEvent(const CEventDescriptor &/* event */)
{
	H_AUTO(Rz_CCtrlPolygon_handleEvent)
	return false;
}

//*********************************************************************************
// TMP TMP
void CCtrlPolygon::computeScaledVertex(NLMISC::CVector2f &dest, const NLMISC::CVector2f &src)
{
	H_AUTO(Rz_CCtrlPolygon_computeScaledVertex)
	dest.set(src.x, src.y);
}

//*********************************************************************************
// TMP TMP
void CCtrlPolygon::touch()
{
	H_AUTO(Rz_CCtrlPolygon_touch)
	updateBoudingRect();
	_Touched = true;
}