/**
 * \file InsetMathSpace.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author André Pönitz
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "InsetMathSpace.h"
#include "MathData.h"
#include "MathStream.h"

#include "LaTeXFeatures.h"
#include "Color.h"

#include "frontends/Painter.h"

using std::string;

namespace lyx {

char const * latex_mathspace[] = {
	"!", "negmedspace", "negthickspace",  // negative space
	",", ":", ";", "quad", "qquad",       // positive space
	"lyxnegspace", "lyxposspace"          // LyX special ("unvisible space")
};

int const nSpace = sizeof(latex_mathspace)/sizeof(char *);

namespace {

int spaceToWidth(int space)
{
	switch (space) {
		case 0: return 6;
		case 1: return 8;
		case 2: return 10;
		case 3: return 6;
		case 4: return 8;
		case 5: return 10;
		case 6: return 20;
		case 7: return 40;
		case 8: return -2;
		case 9: return  2;
		default: return 6;
	}
}

} // anon namespace

InsetMathSpace::InsetMathSpace(int sp)
	: space_(sp)
{
	dim_.asc = 4;
	dim_.des = 0;
	dim_.wid = spaceToWidth(space_);
}


InsetMathSpace::InsetMathSpace(docstring const & name)
	: space_(1)
{
	dim_.asc = 4;
	dim_.des = 0;
	for (int i = 0; i < nSpace; ++i)
		if (latex_mathspace[i] == name)
			space_ = i;
	dim_.wid = spaceToWidth(space_);
}


Inset * InsetMathSpace::clone() const
{
	return new InsetMathSpace(*this);
}


bool InsetMathSpace::metrics(MetricsInfo &, Dimension & dim) const
{
	dim.wid = width();
	dim.asc = ascent();
	dim.des = descent();
	if (dim_ == dim)
		return false;
	dim_ = dim;
	return true;
}


void InsetMathSpace::draw(PainterInfo & pi, int x, int y) const
{
	// Sadly, HP-UX CC can't handle that kind of initialization.
	// XPoint p[4] = {{++x, y-3}, {x, y}, {x+width-2, y}, {x+width-2, y-3}};
	if (space_ >= nSpace - 2)
		return;

	int xp[4];
	int yp[4];
	int w = width();

	xp[0] = ++x;        yp[0] = y - 3;
	xp[1] = x;          yp[1] = y;
	xp[2] = x + w - 2;  yp[2] = y;
	xp[3] = x + w - 2;  yp[3] = y - 3;

	pi.pain.lines(xp, yp, 4, (space_ < 3) ? Color::latex : Color::math);
}


void InsetMathSpace::incSpace()
{
	space_ = (space_ + 1) % (nSpace - 2);
	dim_.wid = spaceToWidth(space_);
}


void InsetMathSpace::validate(LaTeXFeatures & features) const
{
	if (space_ >= 0 && space_< nSpace) {
		if ((latex_mathspace[space_] == string("negmedspace"))
		 || (latex_mathspace[space_] == string("negthickspace")))
			features.require("amsmath");
	}
}


void InsetMathSpace::maple(MapleStream & os) const
{
	os << ' ';
}

void InsetMathSpace::mathematica(MathematicaStream & os) const
{
	os << ' ';
}


void InsetMathSpace::octave(OctaveStream & os) const
{
	os << ' ';
}


void InsetMathSpace::normalize(NormalStream & os) const
{
	os << "[space " << int(space_) << "] ";
}


void InsetMathSpace::write(WriteStream & os) const
{
	if (space_ >= 0 && space_ < nSpace) {
		os << '\\' << latex_mathspace[space_];
		os.pendingSpace(true);
	}
}


} // namespace lyx