#include "tools/tool.h"
#include "tools/toolutils.h"
#include "tools/cursors.h"

#include "tstroke.h"
#include "tstrokeutil.h"
#include "tstrokedeformations.h"
#include "tmathutil.h"
#include "tproperty.h"
#include "drawutil.h"
#include "tcurveutil.h"

#include "toonz/tobjecthandle.h"
#include "toonz/txshlevelhandle.h"
#include "toonz/tstageobject.h"

using namespace ToolUtils;

// For Qt translation support
#include <QCoreApplication>

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

namespace
{

/*
 Controlla se il primo punto della prima sotto_stroke
 e' interno al cerchio, nel caso la stroke successiva
 deve essere quella esterna e cosi' via, basta allora
 fissare un contatore in modo da prendere le stroke
 alternativamente (interne/esterne).
*/
void selectStrokeToMove(const ArrayOfStroke &v,
						const TPointD &center,
						double radius,
						ArrayOfStroke &toMove)
{
	if (v.empty())
		return;

	UINT counter;
	if (tdistance2(v.front()->getPoint(0), center) < sq(radius))
		counter = 0;
	else
		counter = 1;
	do {
		toMove.push_back(v[counter]);
		counter += 2;
	} while (counter < v.size());
}

//=============================================================================
/*
inline  double computeStep(const TQuadratic& quad, double invOfPixelSize)
{  
  double step = std::numeric_limits<double>::max();
  
  TPointD A = quad.getP0() - 2.0*quad.getP1() + quad.getP2(); // 2*A is the acceleration of the curve
  double  A_len = norm(A);
  if (A_len > 0)  step = TConsts::sqrt2 * sqrt(invOfPixelSize/A_len); 
  
  return  step;
}
*/
//-----------------------------------------------------------------------------

void drawQuadratic(const TQuadratic &quad, double pixelSize)
{
	double m_min_step_at_normal_size = computeStep(quad, pixelSize);

	// It draws the curve as a linear piecewise approximation

	double invSqrtScale = 1.0;
	// First of all, it computes the control circles of the curve in screen coordinates
	TPointD scP0 = quad.getP0();
	TPointD scP1 = quad.getP1();
	TPointD scP2 = quad.getP2();

	TPointD A = scP0 - 2 * scP1 + scP2;
	TPointD B = scP0 - scP1;

	double h;
	h = invSqrtScale * m_min_step_at_normal_size;
	double h2 = h * h;

	TPointD P = scP0, D2 = 2 * h2 * A, D1 = A * h2 - 2 * B * h;

	if (h < 0 || isAlmostZero(h))
		return;

	// It draws the whole curve, using forward differencing
	glBegin(GL_LINE_STRIP); // The curve starts from scP0
	glVertex2d(scP0.x, scP0.y);

	for (double t = h; t < 1; t = t + h) {
		P = P + D1;
		D1 = D1 + D2;
		glVertex2d(P.x, P.y);
	}

	glVertex2d(scP2.x, scP2.y); // The curve ends in scP2
	glEnd();
}

} // namespace

//=============================================================================
// MagnetTool
//-----------------------------------------------------------------------------

class MagnetTool : public TTool
{
	Q_DECLARE_TR_FUNCTIONS(MagnetTool)

	bool m_active;

	TPointD
		m_startingPos;

	TPointD
		m_oldPos,
		m_pointAtMouseDown,
		m_pointAtMove;

	DoublePair m_extremes;
	int m_cursorId;

	double m_pointSize;
	TUndo *m_undo;

	typedef struct {
		TStroke *m_parent;
		ArrayOfStroke m_splitted;
		ArrayOfStroke m_splittedToMove;
	} strokeCollection;

	std::vector<strokeCollection> m_strokeToModify;
	//vector<StrokeInfo>  m_info;
	std::vector<TStroke *> m_strokeHit, m_oldStrokesArray;

	std::vector<int> m_changedStrokes;

	std::vector<std::vector<int> *> m_hitStrokeCorners, m_strokeToModifyCorners;

	TDoubleProperty m_toolSize;
	TPropertyGroup m_prop;

public:
	MagnetTool()
		: TTool("T_Magnet"), m_active(false), m_pointSize(-1), m_oldStrokesArray(), m_toolSize("Size:", 0, 100, 20) // W_ToolOptions_MagnetTool
	{
		bind(TTool::Vectors);
		m_prop.bind(m_toolSize);
	}

	ToolType getToolType() const { return TTool::LevelWriteTool; }

	void updateTranslation()
	{
		m_toolSize.setQStringName(tr("Size:"));
	}

	void onEnter()
	{
		if ((TVectorImageP)getImage(false))
			m_cursorId = ToolCursor::MagnetCursor;
		else
			m_cursorId = ToolCursor::CURSOR_NO;

		double x = m_toolSize.getValue();

		double minRange = 1;
		double maxRange = 100;

		double minSize = 10;
		double maxSize = 100;

		m_pointSize = (x - minRange) / (maxRange - minRange) * (maxSize - minSize) + minSize;
	}

	void onLeave()
	{
		m_pointSize = -1;
	}

	void leftButtonDown(const TPointD &pos, const TMouseEvent &e)
	{
		TPointD p(pos);

		m_oldPos = pos;

		m_pointAtMouseDown = p;
		m_startingPos = p;
		m_active = false;
		TVectorImageP vi = TImageP(getImage(true));
		if (!vi)
			return;
		QMutexLocker lock(vi->getMutex());
		m_active = true;

		m_pointAtMove = m_pointAtMouseDown = p;
		m_strokeHit.clear();
		m_changedStrokes.clear();
		m_strokeToModify.clear();

		std::vector<TStroke *> strokeUndo;

		TStroke *ref;

		m_hitStrokeCorners.clear();
		m_strokeToModifyCorners.clear();

		UINT i = 0;
		for (; i < vi->getStrokeCount(); ++i) {
			if (!vi->inCurrentGroup(i))
				continue;

			TStroke *stroke = vi->getStroke(i);
			ref = stroke;
			//  calcola le intersezioni
			std::vector<double> intersections;
			intersect(*ref, p, m_pointSize, intersections);

			if (intersections.empty()) {
				if (increaseControlPoints(*ref,
										  TStrokePointDeformation(p, m_pointSize))) {
					m_changedStrokes.push_back(i);
					m_strokeHit.push_back(ref);

					std::vector<int> *corners = new std::vector<int>;
					corners->push_back(0);
					detectCorners(ref, 20, *corners);
					corners->push_back(ref->getChunkCount());
					m_hitStrokeCorners.push_back(corners);

					ref->disableComputeOfCaches();

					strokeUndo.push_back(ref);
				}
			} else {
				strokeUndo.push_back(ref);

				MagnetTool::strokeCollection sc;

				sc.m_parent = ref;

				splitStroke(*sc.m_parent, intersections, sc.m_splitted);

				selectStrokeToMove(sc.m_splitted,
								   p,
								   m_pointSize,
								   sc.m_splittedToMove);
				for (UINT ii = 0; ii < sc.m_splittedToMove.size(); ++ii) {
					TStroke *temp = sc.m_splittedToMove[ii];
					bool test = increaseControlPoints(*temp, TStrokePointDeformation(p, m_pointSize));
					assert(test);

					std::vector<int> *corners = new std::vector<int>;
					corners->push_back(0);
					detectCorners(temp, 20, *corners);
					corners->push_back(temp->getChunkCount());
					m_strokeToModifyCorners.push_back(corners);
				}

				m_strokeToModify.push_back(sc);
				m_changedStrokes.push_back(i);
			}
		}

		m_oldStrokesArray.resize(m_changedStrokes.size());
		for (i = 0; i < m_changedStrokes.size(); i++)
			m_oldStrokesArray[i] = new TStroke(*(vi->getStroke(m_changedStrokes[i])));

		if (!strokeUndo.empty()) {
			if (TTool::getApplication()->getCurrentObject()->isSpline())
				m_undo = new UndoPath(getXsheet()->getStageObject(getObjectId())->getSpline());
			else {
				TXshSimpleLevel *sl = TTool::getApplication()->getCurrentLevel()->getSimpleLevel();
				assert(sl);
				TFrameId id = getCurrentFid();
				m_undo = new UndoModifyListStroke(sl, id, strokeUndo);
			}
		}

		invalidate();
		// vi->validateRegionEdges(ref, true);
	};

	void leftButtonDrag(const TPointD &p, const TMouseEvent &)
	{

		if (!m_active)
			return;

		//      double dx = p.x - m_pointAtMouseDown.x;
		double pixelSize = getPixelSize();
		if (tdistance2(p, m_oldPos) < 9.0 * pixelSize * pixelSize)
			return;

		m_oldPos = p;
		m_pointAtMouseDown = p;

		//double sc = exp(0.001 * (double)dx);
		TVectorImageP vi = TImageP(getImage(true));
		if (!vi)
			return;
		QMutexLocker lock(vi->getMutex());
		TPointD
			offset = p - m_pointAtMove;

		/*
      if( tdistance2(m_pointAtMouseDown, p ) > sq(m_pointSize * 0.5) ) // reincremento
      {
      leftButtonUp(p);
      lefrightButtonDown(p);
      }
    */
		UINT i, j;

		for (i = 0; i < m_strokeHit.size(); ++i)
			modifyControlPoints(*m_strokeHit[i],
								TStrokePointDeformation(offset, m_pointAtMouseDown, m_pointSize * 0.7));

		for (i = 0; i < m_strokeToModify.size(); ++i)
			for (j = 0; j < m_strokeToModify[i].m_splittedToMove.size(); ++j) {
				TStroke *temp = m_strokeToModify[i].m_splittedToMove[j];
				modifyControlPoints(*temp, TStrokePointDeformation(offset, m_pointAtMouseDown, m_pointSize * 0.7));
			}

		m_pointAtMove = p;

		invalidate();
	};

	void mouseMove(const TPointD &p, const TMouseEvent &e)
	{
		m_pointAtMove = p;
		double pixelSize = getPixelSize();
		if (tdistance2(p, m_oldPos) < 9.0 * pixelSize * pixelSize)
			return;

		m_oldPos = p;
		invalidate();
	}

	void leftButtonUp(const TPointD &, const TMouseEvent &)
	{
		if (!m_active)
			return;

		m_active = false;
		m_pointAtMouseDown = m_pointAtMove = TConsts::napd;

		TStroke *ref;

		TVectorImageP vi = TImageP(getImage(true));
		if (!vi)
			return;
		QMutexLocker lock(vi->getMutex());
		UINT i, j;

		for (i = 0; i < m_strokeHit.size(); ++i) {
			ref = m_strokeHit[i];
			ref->enableComputeOfCaches();
			ref->reduceControlPoints(getPixelSize() * ReduceControlPointCorrection, *(m_hitStrokeCorners[i]));
			// vi->validateRegionEdges(ref, false);
		}
		clearPointerContainer(m_hitStrokeCorners);
		m_hitStrokeCorners.clear();

		UINT count = 0;
		for (i = 0; i < m_strokeToModify.size(); ++i) {
			// recupero la stroke collection
			MagnetTool::strokeCollection &sc = m_strokeToModify[i];

			for (j = 0; j < sc.m_splittedToMove.size(); ++j) {
				ref = sc.m_splittedToMove[j];
				ref->enableComputeOfCaches();
				ref->reduceControlPoints(getPixelSize() * ReduceControlPointCorrection, *(m_strokeToModifyCorners[count++]));
			}

			// ricostruisco una stroke con quella data
			ref = merge(sc.m_splitted);

			if (sc.m_parent->isSelfLoop()) {
				int cpCount = ref->getControlPointCount();
				TThickPoint p1 = ref->getControlPoint(0);
				TThickPoint p2 = ref->getControlPoint(cpCount - 1);
				TThickPoint midP = (p1 + p2) * 0.5;
				ref->setControlPoint(0, midP);
				ref->setControlPoint(cpCount - 1, midP);
				ref->setSelfLoop(true);
			}

			sc.m_parent->swapGeometry(*ref);

			delete ref;							  // elimino la curva temporanea
			clearPointerContainer(sc.m_splitted); // pulisco le stroke trovate con lo split
			sc.m_splittedToMove.clear();		  // pulisco il contenitore ( le stroke
												  // che erano contenute qua sono state
												  // eliminate nella clearPointer....
		}
		clearPointerContainer(m_strokeToModifyCorners);
		m_strokeToModifyCorners.clear();

		for (i = 0; i < vi->getStrokeCount(); ++i) {
			ref = vi->getStroke(i);
			ref->invalidate();
		}

		vi->notifyChangedStrokes(m_changedStrokes, m_oldStrokesArray);
		notifyImageChanged();
		if (m_undo)
			TUndoManager::manager()->add(m_undo);
		m_undo = 0;
		clearPointerContainer(m_oldStrokesArray);
		m_oldStrokesArray.clear();
		invalidate();
	};

	void draw()
	{
		TVectorImageP vi = TImageP(getImage(true));
		if (!vi)
			return;

		//TAffine viewMatrix = getViewer()->getViewMatrix();
		//glPushMatrix();
		//tglMultMatrix(viewMatrix);

		if (m_pointSize > 0) {
			tglColor(TPixel32::Red);
			tglDrawCircle(m_pointAtMove, m_pointSize);
		}

		if (!m_active) {
			//glPopMatrix();
			return;
		}

		TPointD delta = m_pointAtMouseDown - m_startingPos;

		//    glPushMatrix();
		//tglMultMatrix(m_referenceMatrix);

		if (!m_strokeHit.empty())
			for (UINT i = 0; i < m_strokeHit.size(); ++i)
				drawStrokeCenterline(*m_strokeHit[i], getPixelSize());

		tglColor(TPixel32::Red);
		UINT i, j;

		for (i = 0; i < m_strokeToModify.size(); ++i)
			for (j = 0; j < m_strokeToModify[i].m_splittedToMove.size(); ++j) {
				TStroke *temp = m_strokeToModify[i].m_splittedToMove[j];
				drawStrokeCenterline(*temp, getPixelSize());
			}

		//    glPopMatrix();
		//glPopMatrix();
	}

	void onActivate()
	{
		//        getApplication()->editImageOrSpline();
	}

	TPropertyGroup *getProperties(int targetType)
	{
		return &m_prop;
	}

	int getCursorId() const { return m_cursorId; }

} magnetTool;

//TTool *getMagnetTool() {return &magnetTool;}