/**
 * \file src/Font.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Lars Gullik Bjønnes
 * \author Jean-Marc Lasgouttes
 * \author Angus Leeming
 * \author André Pönitz
 * \author Dekel Tsur
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "Font.h"

#include "BufferParams.h" // stateText
#include "Color.h"
#include "debug.h"
#include "Encoding.h"
#include "gettext.h"
#include "Language.h"
#include "LaTeXFeatures.h"
#include "Lexer.h"
#include "LyXRC.h"
#include "output_latex.h"
#include "OutputParams.h"

#include "support/convert.h"
#include "support/lstrings.h"

using std::endl;
using std::string;
using std::ostream;
using std::ostringstream;
using std::istringstream;
using std::pair;

#ifndef CXX_GLOBAL_CSTD
using std::strlen;
#endif


namespace lyx {

using support::ascii_lowercase;
using support::bformat;
using support::rtrim;
using support::subst;

//
// Names for the GUI
//

namespace {

char const * GUIFamilyNames[NUM_FAMILIES + 2 /* default & error */] =
{ N_("Roman"), N_("Sans Serif"), N_("Typewriter"), N_("Symbol"),
  "cmr", "cmsy", "cmm", "cmex", "msa", "msb", "eufrak", "wasy", "esint",
  N_("Inherit"), N_("Ignore") };

char const * GUISeriesNames[4] =
{ N_("Medium"), N_("Bold"), N_("Inherit"), N_("Ignore") };

char const * GUIShapeNames[6] =
{ N_("Upright"), N_("Italic"), N_("Slanted"), N_("Smallcaps"), N_("Inherit"),
  N_("Ignore") };

char const * GUISizeNames[14] =
{ N_("Tiny"), N_("Smallest"), N_("Smaller"), N_("Small"), N_("Normal"), N_("Large"),
  N_("Larger"), N_("Largest"), N_("Huge"), N_("Huger"), N_("Increase"), N_("Decrease"),
  N_("Inherit"), N_("Ignore") };

char const * GUIMiscNames[5] =
{ N_("Off"), N_("On"), N_("Toggle"), N_("Inherit"), N_("Ignore") };


//
// Strings used to read and write .lyx format files
//
char const * LyXFamilyNames[NUM_FAMILIES + 2 /* default & error */] =
{ "roman", "sans", "typewriter", "symbol",
  "cmr", "cmsy", "cmm", "cmex", "msa", "msb", "eufrak", "wasy", "esint",
  "default", "error" };

char const * LyXSeriesNames[4] =
{ "medium", "bold", "default", "error" };

char const * LyXShapeNames[6] =
{ "up", "italic", "slanted", "smallcaps", "default", "error" };

char const * LyXSizeNames[14] =
{ "tiny", "scriptsize", "footnotesize", "small", "normal", "large",
  "larger", "largest", "huge", "giant",
  "increase", "decrease", "default", "error" };

char const * LyXMiscNames[5] =
{ "off", "on", "toggle", "default", "error" };

//
// Strings used to write LaTeX files
//
char const * LaTeXFamilyNames[6] =
{ "textrm", "textsf", "texttt", "error1", "error2", "error3" };

char const * LaTeXSeriesNames[4] =
{ "textmd", "textbf", "error4", "error5" };

char const * LaTeXShapeNames[6] =
{ "textup", "textit", "textsl", "textsc", "error6", "error7" };

char const * LaTeXSizeNames[14] =
{ "tiny", "scriptsize", "footnotesize", "small", "normalsize", "large",
  "Large", "LARGE", "huge", "Huge", "error8", "error9", "error10", "error11" };

} // namespace anon


Font::Font(FontInfo bits, Language const * l)
	: bits_(bits), lang_(l), open_encoding_(false)
{
	if (!lang_)
		lang_ = default_language;
}


bool Font::isRightToLeft() const
{
	return lang_->rightToLeft();
}


bool Font::isVisibleRightToLeft() const
{
	return (lang_->rightToLeft() &&
		bits_.number() != FONT_ON);
}


void Font::setLanguage(Language const * l)
{
	lang_ = l;
}


/// Updates font settings according to request
void Font::update(Font const & newfont,
		     Language const * document_language,
		     bool toggleall)
{
	bits_.update(newfont.fontInfo(), toggleall);

	if (newfont.language() == language() && toggleall)
		if (language() == document_language)
			setLanguage(default_language);
		else
			setLanguage(document_language);
	else if (newfont.language() != ignore_language)
		setLanguage(newfont.language());
}


docstring const stateText(FontInfo const & f)
{
	odocstringstream os;
	if (f.family() != INHERIT_FAMILY)
		os << _(GUIFamilyNames[f.family()]) << ", ";
	if (f.series() != INHERIT_SERIES)
		os << _(GUISeriesNames[f.series()]) << ", ";
	if (f.shape() != INHERIT_SHAPE)
		os << _(GUIShapeNames[f.shape()]) << ", ";
	if (f.size() != FONT_SIZE_INHERIT)
		os << _(GUISizeNames[f.size()]) << ", ";
	if (f.color() != Color_inherit)
		os << lcolor.getGUIName(f.color()) << ", ";
	// FIXME: uncomment this when we support background.
	//if (f.background() != Color_inherit)
	//	os << lcolor.getGUIName(f.background()) << ", ";
	if (f.emph() != FONT_INHERIT)
		os << bformat(_("Emphasis %1$s, "),
			      _(GUIMiscNames[f.emph()]));
	if (f.underbar() != FONT_INHERIT)
		os << bformat(_("Underline %1$s, "),
			      _(GUIMiscNames[f.underbar()]));
	if (f.noun() != FONT_INHERIT)
		os << bformat(_("Noun %1$s, "),
			      _(GUIMiscNames[f.noun()]));
	if (f == inherit_font)
		os << _("Default") << ", ";

	return os.str();
}


docstring const Font::stateText(BufferParams * params) const
{
	odocstringstream os;
	os << lyx::stateText(bits_);
	if (!params || (language() != params->language))
		os << bformat(_("Language: %1$s, "),
			      _(language()->display()));
	if (bits_.number() != FONT_OFF)
		os << bformat(_("  Number %1$s"),
			      _(GUIMiscNames[bits_.number()]));
	return rtrim(os.str(), ", ");
}


// Set family according to lyx format string
void setLyXFamily(string const & fam, FontInfo & f)
{
	string const s = ascii_lowercase(fam);

	int i = 0;
	while (LyXFamilyNames[i] != s &&
	       LyXFamilyNames[i] != string("error"))
		++i;
	if (s == LyXFamilyNames[i])
		f.setFamily(FontFamily(i));
	else
		lyxerr << "setLyXFamily: Unknown family `"
		       << s << '\'' << endl;
}


// Set series according to lyx format string
void setLyXSeries(string const & ser, FontInfo & f)
{
	string const s = ascii_lowercase(ser);

	int i = 0;
	while (LyXSeriesNames[i] != s &&
	       LyXSeriesNames[i] != string("error")) ++i;
	if (s == LyXSeriesNames[i]) {
		f.setSeries(FontSeries(i));
	} else
		lyxerr << "setLyXSeries: Unknown series `"
		       << s << '\'' << endl;
}


// Set shape according to lyx format string
void setLyXShape(string const & sha, FontInfo & f)
{
	string const s = ascii_lowercase(sha);

	int i = 0;
	while (LyXShapeNames[i] != s && LyXShapeNames[i] != string("error"))
			++i;
	if (s == LyXShapeNames[i])
		f.setShape(FontShape(i));
	else
		lyxerr << "Font::setLyXShape: Unknown shape `"
		       << s << '\'' << endl;
}


// Set size according to lyx format string
void setLyXSize(string const & siz, FontInfo & f)
{
	string const s = ascii_lowercase(siz);
	int i = 0;
	while (LyXSizeNames[i] != s && LyXSizeNames[i] != string("error"))
		++i;
	if (s == LyXSizeNames[i]) {
		f.setSize(FontSize(i));
	} else
		lyxerr << "Font::setLyXSize: Unknown size `"
		       << s << '\'' << endl;
}


// Set size according to lyx format string
FontState Font::setLyXMisc(string const & siz)
{
	string const s = ascii_lowercase(siz);
	int i = 0;
	while (LyXMiscNames[i] != s &&
	       LyXMiscNames[i] != string("error")) ++i;
	if (s == LyXMiscNames[i])
		return FontState(i);
	lyxerr << "Font::setLyXMisc: Unknown misc flag `"
	       << s << '\'' << endl;
	return FONT_OFF;
}


/// Sets color after LyX text format
void setLyXColor(string const & col, FontInfo & f)
{
	f.setColor(lcolor.getFromLyXName(col));
}


// Returns size in latex format
string const Font::latexSize() const
{
	return LaTeXSizeNames[bits_.size()];
}


// Read a font definition from given file in lyx format
// Used for layouts
FontInfo lyxRead(Lexer & lex)
{
	FontInfo f;
	bool error = false;
	bool finished = false;
	while (!finished && lex.isOK() && !error) {
		lex.next();
		string const tok = ascii_lowercase(lex.getString());

		if (tok.empty()) {
			continue;
		} else if (tok == "endfont") {
			finished = true;
		} else if (tok == "family") {
			lex.next();
			string const ttok = lex.getString();
			setLyXFamily(ttok, f);
		} else if (tok == "series") {
			lex.next();
			string const ttok = lex.getString();
			setLyXSeries(ttok, f);
		} else if (tok == "shape") {
			lex.next();
			string const ttok = lex.getString();
			setLyXShape(ttok, f);
		} else if (tok == "size") {
			lex.next();
			string const ttok = lex.getString();
			setLyXSize(ttok, f);
		} else if (tok == "misc") {
			lex.next();
			string const ttok = ascii_lowercase(lex.getString());

			if (ttok == "no_bar") {
				f.setUnderbar(FONT_OFF);
			} else if (ttok == "no_emph") {
				f.setEmph(FONT_OFF);
			} else if (ttok == "no_noun") {
				f.setNoun(FONT_OFF);
			} else if (ttok == "emph") {
				f.setEmph(FONT_ON);
			} else if (ttok == "underbar") {
				f.setUnderbar(FONT_ON);
			} else if (ttok == "noun") {
				f.setNoun(FONT_ON);
			} else {
				lex.printError("Illegal misc type `$$Token'");
			}
		} else if (tok == "color") {
			lex.next();
			string const ttok = lex.getString();
			setLyXColor(ttok, f);
		} else {
			lex.printError("Unknown tag `$$Token'");
			error = true;
		}
	}
	return f;
}


/// Writes the changes from this font to orgfont in .lyx format in file
void Font::lyxWriteChanges(Font const & orgfont,
			      ostream & os) const
{
	os << "\n";
	if (orgfont.fontInfo().family() != bits_.family())
		os << "\\family " << LyXFamilyNames[bits_.family()] << "\n";
	if (orgfont.fontInfo().series() != bits_.series())
		os << "\\series " << LyXSeriesNames[bits_.series()] << "\n";
	if (orgfont.fontInfo().shape() != bits_.shape())
		os << "\\shape " << LyXShapeNames[bits_.shape()] << "\n";
	if (orgfont.fontInfo().size() != bits_.size())
		os << "\\size " << LyXSizeNames[bits_.size()] << "\n";
	if (orgfont.fontInfo().emph() != bits_.emph())
		os << "\\emph " << LyXMiscNames[bits_.emph()] << "\n";
	if (orgfont.fontInfo().number() != bits_.number())
		os << "\\numeric " << LyXMiscNames[bits_.number()] << "\n";
	if (orgfont.fontInfo().underbar() != bits_.underbar()) {
		// This is only for backwards compatibility
		switch (bits_.underbar()) {
		case FONT_OFF:	os << "\\bar no\n"; break;
		case FONT_ON:        os << "\\bar under\n"; break;
		case FONT_TOGGLE:	lyxerr << "Font::lyxWriteFontChanges: "
					"FONT_TOGGLE should not appear here!"
				       << endl;
		break;
		case FONT_INHERIT:   os << "\\bar default\n"; break;
		case FONT_IGNORE:    lyxerr << "Font::lyxWriteFontChanges: "
					"IGNORE should not appear here!"
				       << endl;
		break;
		}
	}
	if (orgfont.fontInfo().noun() != bits_.noun()) {
		os << "\\noun " << LyXMiscNames[bits_.noun()] << "\n";
	}
	if (orgfont.fontInfo().color() != bits_.color())
		os << "\\color " << lcolor.getLyXName(bits_.color()) << '\n';
	// FIXME: uncomment this when we support background.
	//if (orgfont.fontInfo().background() != bits_.background())
	//	os << "\\color " << lcolor.getLyXName(bits_.background()) << '\n';
	if (orgfont.language() != language() &&
	    language() != latex_language) {
		if (language())
			os << "\\lang " << language()->lang() << "\n";
		else
			os << "\\lang unknown\n";
	}
}


/// Writes the head of the LaTeX needed to impose this font
// Returns number of chars written.
int Font::latexWriteStartChanges(odocstream & os, BufferParams const & bparams,
				    OutputParams const & runparams,
				    Font const & base,
				    Font const & prev) const
{
	bool env = false;

	int count = 0;
	if (language()->babel() != base.language()->babel() &&
	    language() != prev.language()) {
		if (language()->lang() == "farsi") {
			os << "\\textFR{";
			count += 8;
		} else if (!isRightToLeft() &&
			    base.language()->lang() == "farsi") {
			os << "\\textLR{";
			count += 8;
		} else if (language()->lang() == "arabic_arabi") {
			os << "\\textAR{";
			count += 8;
 		} else if (!isRightToLeft() &&
				base.language()->lang() == "arabic_arabi") {
			os << "\\textLR{";
			count += 8;
		// currently the remaining RTL languages are arabic_arabtex and hebrew
		} else if (isRightToLeft() != prev.isRightToLeft()) {
			if (isRightToLeft()) {
				os << "\\R{";
				count += 3;
			} else {
				os << "\\L{";
				count += 3;
			}
		} else if (!language()->babel().empty()) {
			string const tmp =
				subst(lyxrc.language_command_local,
				      "$$lang", language()->babel());
			os << from_ascii(tmp);
			count += tmp.length();
		} else {
			os << '{';
			count += 1;
		}
	}

	if (language()->encoding()->package() == Encoding::CJK) {
		pair<bool, int> const c = switchEncoding(os, bparams,
				runparams.moving_arg, *(runparams.encoding),
				*(language()->encoding()));
		if (c.first) {
			open_encoding_ = true;
			count += c.second;
			runparams.encoding = language()->encoding();
		}
	}

	// When the current language is Hebrew, Arabic, or Farsi
	// the numbers are written Left-to-Right. ArabTeX package
	// reorders the number automatically but the packages used
	// for Hebrew and Farsi (Arabi) do not.
	if (bits_.number() == FONT_ON && prev.fontInfo().number() != FONT_ON
		&& (language()->lang() == "hebrew"
			|| language()->lang() == "farsi" 
			|| language()->lang() == "arabic_arabi")) {
		os << "{\\beginL ";
		count += 9;
	}

	FontInfo f = bits_;
	f.reduce(base.bits_);

	if (f.family() != INHERIT_FAMILY) {
		os << '\\'
		   << LaTeXFamilyNames[f.family()]
		   << '{';
		count += strlen(LaTeXFamilyNames[f.family()]) + 2;
		env = true; //We have opened a new environment
	}
	if (f.series() != INHERIT_SERIES) {
		os << '\\'
		   << LaTeXSeriesNames[f.series()]
		   << '{';
		count += strlen(LaTeXSeriesNames[f.series()]) + 2;
		env = true; //We have opened a new environment
	}
	if (f.shape() != INHERIT_SHAPE) {
		os << '\\'
		   << LaTeXShapeNames[f.shape()]
		   << '{';
		count += strlen(LaTeXShapeNames[f.shape()]) + 2;
		env = true; //We have opened a new environment
	}
	if (f.color() != Color_inherit && f.color() != Color_ignore) {
		os << "\\textcolor{"
		   << from_ascii(lcolor.getLaTeXName(f.color()))
		   << "}{";
		count += lcolor.getLaTeXName(f.color()).length() + 13;
		env = true; //We have opened a new environment
	}
	// FIXME: uncomment this when we support background.
	/*
	if (f.background() != Color_inherit && f.background() != Color_ignore) {
		os << "\\textcolor{"
		   << from_ascii(lcolor.getLaTeXName(f.background()))
		   << "}{";
		count += lcolor.getLaTeXName(f.background()).length() + 13;
		env = true; //We have opened a new environment
	}
	*/
	if (f.emph() == FONT_ON) {
		os << "\\emph{";
		count += 6;
		env = true; //We have opened a new environment
	}
	if (f.underbar() == FONT_ON) {
		os << "\\underbar{";
		count += 10;
		env = true; //We have opened a new environment
	}
	// \noun{} is a LyX special macro
	if (f.noun() == FONT_ON) {
		os << "\\noun{";
		count += 6;
		env = true; //We have opened a new environment
	}
	if (f.size() != FONT_SIZE_INHERIT) {
		// If we didn't open an environment above, we open one here
		if (!env) {
			os << '{';
			++count;
		}
		os << '\\'
		   << LaTeXSizeNames[f.size()]
		   << ' ';
		count += strlen(LaTeXSizeNames[f.size()]) + 2;
	}
	return count;
}


/// Writes ending block of LaTeX needed to close use of this font
// Returns number of chars written
// This one corresponds to latexWriteStartChanges(). (Asger)
int Font::latexWriteEndChanges(odocstream & os, BufferParams const & bparams,
				  OutputParams const & runparams,
				  Font const & base,
				  Font const & next,
				  bool const & closeLanguage) const
{
	int count = 0;
	bool env = false;

	// reduce the current font to changes against the base
	// font (of the layout). We use a temporary for this to
	// avoid changing this font instance, as that would break
	FontInfo f = bits_;
	f.reduce(base.bits_);

	if (f.family() != INHERIT_FAMILY) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.series() != INHERIT_SERIES) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.shape() != INHERIT_SHAPE) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.color() != Color_inherit && f.color() != Color_ignore) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.emph() == FONT_ON) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.underbar() == FONT_ON) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.noun() == FONT_ON) {
		os << '}';
		++count;
		env = true; // Size change need not bother about closing env.
	}
	if (f.size() != FONT_SIZE_INHERIT) {
		// We only have to close if only size changed
		if (!env) {
			os << '}';
			++count;
		}
	}

	// When the current language is Hebrew, Arabic, or Farsi
	// the numbers are written Left-to-Right. ArabTeX package
	// reorders the number automatically but the packages used
	// for Hebrew and Farsi (Arabi) do not.
	if (bits_.number() == FONT_ON && next.fontInfo().number() != FONT_ON
		&& (language()->lang() == "hebrew"
			|| language()->lang() == "farsi"
			|| language()->lang() == "arabic_arabi")) {
		os << "\\endL}";
		count += 6;
	}

	if (open_encoding_) {
		// We need to close the encoding even if it does not change
		// to do correct environment nesting
		Encoding const * const ascii = encodings.getFromLyXName("ascii");
		pair<bool, int> const c = switchEncoding(os, bparams,
				runparams.moving_arg, *(runparams.encoding),
				*ascii);
		BOOST_ASSERT(c.first);
		count += c.second;
		runparams.encoding = ascii;
		open_encoding_ = false;
	}

	if (closeLanguage &&
			language() != base.language() && language() != next.language()) {
		os << '}';
		++count;
	}

	return count;
}


std::string Font::toString(bool const toggle) const
{
	string lang = "ignore";
	if (language())
		lang = language()->lang();

	ostringstream os;
	os << "family " << bits_.family() << '\n'
	   << "series " << bits_.series() << '\n'
	   << "shape " << bits_.shape() << '\n'
	   << "size " << bits_.size() << '\n'
	   << "emph " << bits_.emph() << '\n'
	   << "underbar " << bits_.underbar() << '\n'
	   << "noun " << bits_.noun() << '\n'
	   << "number " << bits_.number() << '\n'
	   << "color " << bits_.color() << '\n'
	   << "language " << lang << '\n'
	   << "toggleall " << convert<string>(toggle);
	return os.str();
}


bool Font::fromString(string const & data, bool & toggle)
{
	istringstream is(data);
	Lexer lex(0,0);
	lex.setStream(is);

	int nset = 0;
	while (lex.isOK()) {
		string token;
		if (lex.next())
			token = lex.getString();

		if (token.empty() || !lex.next())
			break;

		if (token == "family") {
			int const next = lex.getInteger();
			bits_.setFamily(FontFamily(next));

		} else if (token == "series") {
			int const next = lex.getInteger();
			bits_.setSeries(FontSeries(next));

		} else if (token == "shape") {
			int const next = lex.getInteger();
			bits_.setShape(FontShape(next));

		} else if (token == "size") {
			int const next = lex.getInteger();
			bits_.setSize(FontSize(next));

		} else if (token == "emph" || token == "underbar" ||
			   token == "noun" || token == "number") {

			int const next = lex.getInteger();
			FontState const misc = FontState(next);

			if (token == "emph")
				bits_.setEmph(misc);
			else if (token == "underbar")
				bits_.setUnderbar(misc);
			else if (token == "noun")
				bits_.setNoun(misc);
			else if (token == "number")
				bits_.setNumber(misc);

		} else if (token == "color") {
			int const next = lex.getInteger();
			bits_.setColor(ColorCode(next));

		/**
		} else if (token == "background") {
			int const next = lex.getInteger();
			bits_.setBackground(ColorCode(next));
		*/

		} else if (token == "language") {
			string const next = lex.getString();
			if (next == "ignore")
				setLanguage(ignore_language);
			else
				setLanguage(languages.getLanguage(next));

		} else if (token == "toggleall") {
			toggle = lex.getBool();

		} else {
			// Unrecognised token
			break;
		}

		++nset;
	}
	return (nset > 0);
}


void Font::validate(LaTeXFeatures & features) const
{
	BufferParams const & bparams = features.bufferParams();
	Language const * doc_language = bparams.language;

	if (bits_.noun() == FONT_ON) {
		LYXERR(Debug::LATEX) << "font.noun: "
			<< bits_.noun()
			<< endl;
		features.require("noun");
		LYXERR(Debug::LATEX) << "Noun enabled. Font: "
			<< to_utf8(stateText(0))
			<< endl;
	}
	switch (bits_.color()) {
		case Color_none:
		case Color_inherit:
		case Color_ignore:
			// probably we should put here all interface colors used for
			// font displaying! For now I just add this ones I know of (Jug)
		case Color_latex:
		case Color_note:
			break;
		default:
			features.require("color");
			LYXERR(Debug::LATEX) << "Color enabled. Font: "
				<< to_utf8(stateText(0))
				<< endl;
	}

	// FIXME: Do something for background and soul package?

	if (lang_->babel() != doc_language->babel() &&
		lang_ != ignore_language &&
		lang_ != latex_language)
	{
		features.useLanguage(lang_);
		LYXERR(Debug::LATEX) << "Found language "
			<< lang_->lang() << endl;
	}
}


ostream & operator<<(ostream & os, FontState fms)
{
	return os << int(fms);
}


ostream & operator<<(std::ostream & os, FontInfo const & f)
{
	return os << "font:"
		<< " family " << f.family()
		<< " series " << f.series()
		<< " shape " << f.shape()
		<< " size " << f.size()
		<< " color " << f.color()
		// FIXME: uncomment this when we support background.
		//<< " background " << f.background()
		<< " emph " << f.emph()
		<< " underbar " << f.underbar()
		<< " noun " << f.noun()
		<< " number " << f.number();
}


std::ostream & operator<<(std::ostream & os, Font const & font)
{
	return os << font.bits_
		<< " lang: " << (font.lang_ ? font.lang_->lang() : 0);
}


} // namespace lyx