/**
 * \file MetricsInfo.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 "MetricsInfo.h"

#include "LyXRC.h"

#include "insets/Inset.h"

#include "mathed/MathSupport.h"

#include "frontends/FontMetrics.h"
#include "frontends/Painter.h"

using namespace std;


namespace lyx {

/////////////////////////////////////////////////////////////////////////
//
// MetricsBase
//
/////////////////////////////////////////////////////////////////////////

MetricsBase::MetricsBase(BufferView * b, FontInfo f, int w)
	: bv(b), font(std::move(f)), fontname("mathnormal"),
	  textwidth(w), macro_nesting(0),
	  solid_line_thickness_(1), solid_line_offset_(1), dotted_line_thickness_(1)
{
	if (lyxrc.currentZoom >= 200) {
		// derive the line thickness from zoom factor
		// the zoom is given in percent
		// (increase thickness at 250%, 450% etc.)
		solid_line_thickness_ = (lyxrc.currentZoom + 150) / 200;
		// adjust line_offset_ too
		solid_line_offset_ = 1 + solid_line_thickness_ / 2;
	}
	if (lyxrc.currentZoom >= 100) {
		// derive the line thickness from zoom factor
		// the zoom is given in percent
		// (increase thickness at 150%, 250% etc.)
		dotted_line_thickness_ = (lyxrc.currentZoom + 50) / 100;
	}
}


Changer MetricsBase::changeFontSet(string const & name)
{
	RefChanger<MetricsBase> rc = make_save(*this);
	ColorCode oldcolor = font.color();
	string const oldname = fontname;
	fontname = name;
	if (isMathFont(name) || isMathFont(oldname))
		font = sane_font;
	augmentFont(font, name);
	font.setSize(rc->old.font.size());
	font.setStyle(rc->old.font.style());
	if (name == "emph") {
		font.setColor(oldcolor);
		if (rc->old.font.shape() != UP_SHAPE)
			font.setShape(UP_SHAPE);
		else
			font.setShape(ITALIC_SHAPE);
	} else if (name != "lyxtex"
	    && ((isTextFont(oldname) && oldcolor != Color_foreground)
	        || (isMathFont(oldname) && oldcolor != Color_math)))
		font.setColor(oldcolor);
#if __cplusplus >= 201402L
	return rc;
#else
	/** In theory, this is not needed with C++11, and modern compilers
	 * will complain in C++11 mode, but gcc 4.9 requires this. */
	return std::move(rc);
#endif
}


Changer MetricsBase::changeEnsureMath(Inset::mode_type mode)
{
	switch (mode) {
	case Inset::UNDECIDED_MODE:
		return noChange();
	case Inset::TEXT_MODE:
		return isMathFont(fontname) ? changeFontSet("textnormal") : noChange();
	case Inset::MATH_MODE:
		// FIXME:
		//   \textit{\ensuremath{\text{a}}}
		// should appear in italics
		return isTextFont(fontname) ? changeFontSet("mathnormal"): noChange();
	}
	return noChange();
}


int MetricsBase::inPixels(Length const & len) const
{
	FontInfo fi = font;
	if (len.unit() == Length::MU)
		// mu is 1/18th of an em in the math symbol font
		fi.setFamily(SYMBOL_FAMILY);
	else
		// Math style is only taken into account in the case of mu
		fi.setStyle(TEXT_STYLE);
	return len.inPixels(textwidth, theFontMetrics(fi).em());
}


/////////////////////////////////////////////////////////////////////////
//
// MetricsInfo
//
/////////////////////////////////////////////////////////////////////////

MetricsInfo::MetricsInfo(BufferView * bv, FontInfo font, int textwidth,
                         MacroContext const & mc, bool vm, bool tight)
	: base(bv, font, textwidth), macrocontext(mc), vmode(vm), tight_insets(tight)
{}


/////////////////////////////////////////////////////////////////////////
//
// PainterInfo
//
/////////////////////////////////////////////////////////////////////////

PainterInfo::PainterInfo(BufferView * bv, lyx::frontend::Painter & painter)
	: pain(painter), ltr_pos(false), change(),
	  selected(false), selected_left(false), selected_right(false),
	  do_spellcheck(true), full_repaint(true), background_color(Color_background),
	  leftx(0), rightx(0)
{
	base.bv = bv;
}


void PainterInfo::draw(int x, int y, char_type c)
{
	pain.text(x, y, c, base.font);
}


void PainterInfo::draw(int x, int y, docstring const & str)
{
	pain.text(x, y, str, base.font);
}


ColorCode PainterInfo::backgroundColor(Inset const * inset, bool sel) const
{
	if (selected && sel)
		// This inset is in a selection
		return Color_selection;

	// special handling for inset background
	if (inset != nullptr) {
		if (pain.develMode() && !inset->isBufferValid())
			// This inset is in error
			return Color_error;

		ColorCode const color_bg = inset->backgroundColor(*this);
		if (color_bg != Color_none)
			// This inset has its own color
			return color_bg;
	}

	if (background_color == Color_none)
		// This inset has no own color and does not inherit a color
		return Color_background;

	// This inset has no own color, but inherits a color
	return background_color;
}


Color PainterInfo::textColor(Color const & color) const
{
	if (change.changed())
		return change.color();
	if (selected)
		return Color_selectiontext;
	return color;
}


Changer MetricsBase::changeScript()
{
	switch (font.style()) {
	case DISPLAY_STYLE:
	case TEXT_STYLE:
		return font.changeStyle(SCRIPT_STYLE);
	case SCRIPT_STYLE:
	case SCRIPTSCRIPT_STYLE:
		return font.changeStyle(SCRIPTSCRIPT_STYLE);
	case INHERIT_STYLE:
	case IGNORE_STYLE:
		return noChange();
	}
	//remove Warning
	return noChange();
}


Changer MetricsBase::changeFrac()
{
	switch (font.style()) {
	case DISPLAY_STYLE:
		return font.changeStyle(TEXT_STYLE);
	case TEXT_STYLE:
		return font.changeStyle(SCRIPT_STYLE);
	case SCRIPT_STYLE:
	case SCRIPTSCRIPT_STYLE:
		return font.changeStyle(SCRIPTSCRIPT_STYLE);
	case INHERIT_STYLE:
	case IGNORE_STYLE:
		return noChange();
	}
	//remove Warning
	return noChange();
}


Changer MetricsBase::changeArray(bool small)
{
	if (small)
		return font.changeStyle(SCRIPT_STYLE);
	return (font.style() == DISPLAY_STYLE) ? font.changeStyle(TEXT_STYLE)
		: noChange();
}


} // namespace lyx