#include "tools/tool.h"
#include "tstopwatch.h"
#include "tools/cursors.h"
#include "tgeometry.h"
#include "tproperty.h"

#include <math.h>

#include "tgl.h"

namespace
{

//=============================================================================
// Zoom Tool
//-----------------------------------------------------------------------------

class ZoomTool : public TTool
{
	int m_oldY;
	TPointD m_center;
	bool m_dragging;
	double m_factor;

public:
	ZoomTool()
		: TTool("T_Zoom"), m_dragging(false), m_oldY(0), m_factor(1)
	{
		bind(TTool::AllTargets);
	}

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

	void updateMatrix() { return setMatrix(TAffine()); }

	void leftButtonDown(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		m_dragging = true;
		int v = 1;
		if (e.isAltPressed())
			v = -1;
		m_oldY = e.m_pos.y;
		// m_center = getViewer()->winToWorld(e.m_pos);
		m_center = TPointD(e.m_pos.x, e.m_pos.y);
		m_factor = 1;
		invalidate();
	}
	void leftButtonDrag(const TPointD &pos, const TMouseEvent &e)
	{
		int d = m_oldY - e.m_pos.y;
		m_oldY = e.m_pos.y;
		double f = exp(-d * 0.01);
		m_factor = f;
		m_viewer->zoom(m_center, f);
	}
	void leftButtonUp(const TPointD &pos, const TMouseEvent &e)
	{
		m_dragging = false;
		invalidate();
	}

	void rightButtonDown(const TPointD &, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		invalidate();
	}

	void draw()
	{
		if (!m_dragging)
			return;

		TPointD center = m_viewer->winToWorld(TPoint(m_center.x, m_center.y));
		double pixelSize = getPixelSize();
		double unit = pixelSize;
		glPushMatrix();
		glTranslated(center.x, center.y, 0);
		glScaled(unit, unit, unit);
		glColor3f(1, 0, 0);

		double u = 4;
		glBegin(GL_LINES);
		glVertex2d(0, -10);
		glVertex2d(0, 10);
		glVertex2d(-10, 0);
		glVertex2d(10, 0);
		glEnd();

		glPopMatrix();
	}

	int getCursorId() const { return ToolCursor::ZoomCursor; }

} zoomTool;

//=============================================================================
// Hand Tool
//-----------------------------------------------------------------------------

class HandTool : public TTool
{
	TStopWatch m_sw;
	TPoint m_oldPos;

public:
	HandTool()
		: TTool("T_Hand")
	{
		bind(TTool::AllTargets);
	}

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

	void updateMatrix() { return setMatrix(TAffine()); }

	void leftButtonDown(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		m_oldPos = e.m_pos;
		m_sw.start(true);
	}

	void leftButtonDrag(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		if (m_sw.getTotalTime() < 10)
			return;
		m_sw.stop();
		m_sw.start(true);
		TPoint delta = e.m_pos - m_oldPos;
		delta.y = -delta.y;
		m_viewer->pan(delta);
		m_oldPos = e.m_pos;
	}

	void leftButtonUp(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		m_sw.stop();
	}

	int getCursorId() const { return ToolCursor::PanCursor; }

} handTool;

//=============================================================================
// Rotate Tool
//-----------------------------------------------------------------------------

class RotateTool : public TTool
{
	TStopWatch m_sw;
	TPointD m_oldPos;
	TPointD m_center;
	bool m_dragging;
	double m_angle;
	TPoint m_oldMousePos;
	TBoolProperty m_cameraCentered;
	TPropertyGroup m_prop;

public:
	RotateTool()
		: TTool("T_Rotate"), m_dragging(false), m_cameraCentered("Rotate On Camera Center", false), m_angle(0)
	{
		bind(TTool::AllTargets);
		m_prop.bind(m_cameraCentered);
	}

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

	void updateMatrix() { return setMatrix(TAffine()); }

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

	void leftButtonDown(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;

		m_angle = 0.0;
		m_dragging = true;
		m_oldPos = pos;
		m_oldMousePos = e.m_pos;
		//m_center = TPointD(0,0);
		m_sw.start(true);
		invalidate();

		//m_center = viewAffine.inv()*TPointD(0,0);//m_viewer->winToWorld(m_viewer);
		//virtual TPointD winToWorld(const TPoint &winPos) const = 0;
	}

	void leftButtonDrag(const TPointD &pos, const TMouseEvent &e)
	{
		if (!m_viewer)
			return;
		if (m_sw.getTotalTime() < 50)
			return;
		m_sw.stop();
		m_sw.start(true);
		TPointD p = pos;
		if (m_viewer->is3DView()) {
			TPoint d = e.m_pos - m_oldMousePos;
			m_oldMousePos = e.m_pos;
			double factor = 0.5;
			m_viewer->rotate3D(factor * d.x, -factor * d.y);
		} else {
			TPointD a = p - m_center;
			TPointD b = m_oldPos - m_center;
			if (norm2(a) > 0 && norm2(b) > 0) {
				double ang = 180 * asin(cross(b, a) / (norm(a) * norm(b))) / TConsts::pi;
				m_angle = m_angle + ang;
				m_viewer->rotate(m_center, m_angle);
			}
		}
		m_oldPos = p;
	}

	void leftButtonUp(const TPointD &pos, const TMouseEvent &e)
	{
		m_dragging = false;
		invalidate();
		m_sw.stop();
	}

	void draw()
	{
		glColor3f(1, 0, 0);
		double u = 50;
		if (m_cameraCentered.getValue())
			m_center = TPointD(0, 0);
		else {
			TAffine aff = m_viewer->getViewMatrix().inv();
			u = u * sqrt(aff.det());
			m_center = aff * TPointD(0, 0);
		}
		tglDrawSegment(TPointD(-u + m_center.x, m_center.y), TPointD(u + m_center.x, m_center.y));
		tglDrawSegment(TPointD(m_center.x, -u + m_center.y), TPointD(m_center.x, u + m_center.y));
	}

	int getCursorId() const { return ToolCursor::RotateCursor; }

} rotateTool;

} // namespace