/**
 * \file InsetRef.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author José Matos
 *
 * Full author contact details are available in file CREDITS.
 */
#include <config.h>

#include "InsetRef.h"

#include "Buffer.h"
#include "BufferParams.h"
#include "Cursor.h"
#include "DispatchResult.h"
#include "InsetLabel.h"
#include "LaTeXFeatures.h"
#include "LyX.h"
#include "OutputParams.h"
#include "output_xhtml.h"
#include "ParIterator.h"
#include "sgml.h"
#include "TocBackend.h"

#include "support/debug.h"
#include "support/docstream.h"
#include "support/gettext.h"
#include "support/lstrings.h"
#include "support/textutils.h"

using namespace lyx::support;
using namespace std;

namespace lyx {


InsetRef::InsetRef(Buffer * buf, InsetCommandParams const & p)
	: InsetCommand(buf, p)
{}


InsetRef::InsetRef(InsetRef const & ir)
	: InsetCommand(ir)
{}


bool InsetRef::isCompatibleCommand(string const & s) {
	//FIXME This is likely not the best way to handle this.
	//But this stuff is hardcoded elsewhere already.
	return s == "ref" 
		|| s == "pageref"
		|| s == "vref" 
		|| s == "vpageref"
		|| s == "formatted"
		|| s == "eqref"
		|| s == "nameref";
}


ParamInfo const & InsetRef::findInfo(string const & /* cmdName */)
{
	static ParamInfo param_info_;
	if (param_info_.empty()) {
		param_info_.add("name", ParamInfo::LATEX_OPTIONAL);
		param_info_.add("reference", ParamInfo::LATEX_REQUIRED,
				ParamInfo::HANDLING_ESCAPE);
	}
	return param_info_;
}


// the ref argument is the label name we are referencing.
// we expect ref to be in the form: pfx:suffix.
//
// if it isn't, then we can't produce a formatted reference, 
// so we return "\ref" and put ref into label.
//
// for refstyle, we return "\pfxcmd", and put suffix into 
// label and pfx into prefix. this is because refstyle expects
// the command: \pfxcmd{suffix}.
// 
// for prettyref, we return "\prettyref" and put ref into label
// and pfx into prefix. this is because prettyref uses the whole
// label, thus: \prettyref{pfx:suffix}.
//
docstring InsetRef::getFormattedCmd(docstring const & ref, 
	docstring & label, docstring & prefix) const
{
	static docstring const defcmd = from_ascii("\\ref");
	static docstring const prtcmd = from_ascii("\\prettyref");
	
	label = split(ref, prefix, ':');

	// we have to have xxx:xxxxx...
	if (label.empty()) {
		LYXERR0("Label `" << ref << "' contains no prefix.");
		label = ref;
		prefix = from_ascii("");
		return defcmd;
	}

	if (prefix.empty()) {
		// we have ":xxxx"
		label = ref;
		return defcmd;
	}
	
	if (!buffer().params().use_refstyle) {
		// \prettyref uses the whole label
		label = ref;
		return prtcmd;
	}

	// make sure the prefix is legal for a latex command
	int const len = prefix.size();
	for (int i = 0; i < len; i++) {
		char_type const c = prefix[i];
		if (!isAlphaASCII(c)) {
			LYXERR0("Prefix `" << prefix << "' is invalid for LaTeX.");
			// restore the label
			label = ref;
			return defcmd;
		}
	}
	return from_ascii("\\") + prefix + from_ascii("ref");
}


docstring InsetRef::getEscapedLabel(OutputParams const & rp) const
{
	InsetCommandParams const & p = params();
	ParamInfo const & pi = p.info();
	ParamInfo::ParamData const & pd = pi["reference"];
	return p.prepareCommand(rp, getParam("reference"), pd.handling());		
}


void InsetRef::latex(otexstream & os, OutputParams const & rp) const
{
	string const cmd = getCmdName();
	docstring const data = getEscapedLabel(rp);

	if (rp.inulemcmd)
		os << "\\mbox{";

	if (cmd == "eqref" && buffer().params().use_refstyle) {
		// we advertise this as printing "(n)", so we'll do that, at least
		// for refstyle, since refstlye's own \eqref prints, by default,
		// "equation n". if one wants \eqref, one can get it by using a
		// formatted label in this case.
		os << '(' << from_ascii("\\ref{") << data << from_ascii("})");
	} 
	else if (cmd == "formatted") {
		docstring label;
		docstring prefix;
		docstring const fcmd = getFormattedCmd(data, label, prefix);
		os << fcmd << '{' << label << '}';
	}
	else {
		// We don't want to output p_["name"], since that is only used 
		// in docbook. So we construct new params, without it, and use that.
		InsetCommandParams p(REF_CODE, cmd);
		docstring const ref = getParam("reference");
		p["reference"] = ref;
		os << p.getCommand(rp);
	}

	if (rp.inulemcmd)
		os << "}";
}


int InsetRef::plaintext(odocstream & os, OutputParams const &) const
{
	docstring const str = getParam("reference");
	os << '[' << str << ']';
	return 2 + str.size();
}


int InsetRef::docbook(odocstream & os, OutputParams const & runparams) const
{
	docstring const & name = getParam("name");
	if (name.empty()) {
		if (runparams.flavor == OutputParams::XML) {
			os << "<xref linkend=\""
			   << sgml::cleanID(buffer(), runparams, getParam("reference"))
			   << "\" />";
		} else {
			os << "<xref linkend=\""
			   << sgml::cleanID(buffer(), runparams, getParam("reference"))
			   << "\">";
		}
	} else {
		os << "<link linkend=\""
		   << sgml::cleanID(buffer(), runparams, getParam("reference"))
		   << "\">"
		   << getParam("name")
		   << "</link>";
	}

	return 0;
}


docstring InsetRef::xhtml(XHTMLStream & xs, OutputParams const &) const
{
	docstring const & ref = getParam("reference");
	InsetLabel const * il = buffer().insetLabel(ref);
	string const & cmd = params().getCmdName();
	docstring display_string;

	if (il && !il->counterValue().empty()) {
		// Try to construct a label from the InsetLabel we reference.
		docstring const & value = il->counterValue();
		if (cmd == "ref")
			display_string = value;
		else if (cmd == "vref")
			// normally, would be "ref on page #", but we have no pages
			display_string = value;
		else if (cmd == "pageref" || cmd == "vpageref")
			// normally would be "on page #", but we have no pages
			display_string = _("elsewhere");
		else if (cmd == "eqref")
			display_string = bformat(from_ascii("equation (%1$s)"), value);
		else if (cmd == "formatted"
		         // we don't really have the ability to handle these 
		         // properly in XHTML output
		         || cmd == "nameref")
			display_string = il->prettyCounter();
	} else 
			display_string = ref;

	// FIXME What we'd really like to do is to be able to output some
	// appropriate sort of text here. But to do that, we need to associate
	// some sort of counter with the label, and we don't have that yet.
	string const attr = "href=\"#" + html::cleanAttr(to_utf8(ref)) + "\"";
	xs << html::StartTag("a", attr);
	xs << display_string;
	xs << html::EndTag("a");
	return docstring();
}


void InsetRef::toString(odocstream & os) const
{
	plaintext(os, OutputParams(0));
}


void InsetRef::forToc(docstring & os, size_t) const
{
	// There's no need for details in the TOC, and a long label
	// will just get in the way.
	os += '#';
}


void InsetRef::updateBuffer(ParIterator const & it, UpdateType)
{
	docstring const & ref = getParam("reference");
	// register this inset into the buffer reference cache.
	buffer().references(ref).push_back(make_pair(this, it));

	docstring label;
	for (int i = 0; !types[i].latex_name.empty(); ++i) {
		if (getCmdName() == types[i].latex_name) {
			label = _(types[i].short_gui_name);
			break;
		}
	}
	label += ref;
	
	if (!buffer().params().isLatex() && !getParam("name").empty()) {
		label += "||";
		label += getParam("name");
	}
	
	screen_label_ = label;
	bool shortened = false;
	unsigned int const maxLabelChars = 24;
	if (screen_label_.size() > maxLabelChars) {
		screen_label_.erase(maxLabelChars - 3);
		screen_label_ += "...";
		shortened = true;
	}
	if (shortened)
		tooltip_ = label;
	else 
		tooltip_ = from_ascii("");
}


void InsetRef::addToToc(DocIterator const & cpit) const
{
	docstring const & label = getParam("reference");
	if (buffer().insetLabel(label))
		// This InsetRef has already been taken care of in InsetLabel::addToToc().
		return;

	// It seems that this reference does not point to any valid label.
	screen_label_ = _("BROKEN: ") + screen_label_;
	Toc & toc = buffer().tocBackend().toc("label");
	toc.push_back(TocItem(cpit, 0, screen_label_));
}


void InsetRef::validate(LaTeXFeatures & features) const
{
	string const cmd = getCmdName();
	if (cmd == "vref" || cmd == "vpageref")
		features.require("varioref");
	else if (cmd == "formatted") {
		docstring const data = getEscapedLabel(features.runparams());
		docstring label;
		docstring prefix;
		string const fcmd = to_utf8(getFormattedCmd(data, label, prefix));
		if (buffer().params().use_refstyle) {
			features.require("refstyle");
			if (!prefix.empty()) {
				string lcmd = "\\AtBeginDocument{\\providecommand" + 
						fcmd + "[1]{\\ref{" + to_utf8(prefix) + ":#1}}}";
				features.addPreambleSnippet(lcmd);
			} else if (prefix == "cha")
				features.addPreambleSnippet("\\let\\charef=\\chapref");
		} else {
			features.require("prettyref");
			// prettyref uses "cha" for chapters, so we provide a kind of
			// translation.
			if (prefix == "chap")
				features.addPreambleSnippet("\\let\\pr@chap=\\pr@cha");
		}
	} else if (cmd == "eqref" && !buffer().params().use_refstyle)
		// with refstyle, we simply output "(\ref{label})"
		features.require("amsmath");
	else if (cmd == "nameref")
		features.require("nameref");
}


InsetRef::type_info InsetRef::types[] = {
	{ "ref",       N_("Standard"),              N_("Ref: ")},
	{ "eqref",     N_("Equation"),              N_("EqRef: ")},
	{ "pageref",   N_("Page Number"),           N_("Page: ")},
	{ "vpageref",  N_("Textual Page Number"),   N_("TextPage: ")},
	{ "vref",      N_("Standard+Textual Page"), N_("Ref+Text: ")},
	{ "formatted", N_("Formatted"),             N_("Format: ")},
	{ "nameref",   N_("Reference to Name"),     N_("NameRef:")},
	{ "", "", "" }
};


int InsetRef::getType(string const & name)
{
	for (int i = 0; !types[i].latex_name.empty(); ++i)
		if (name == types[i].latex_name)
			return i;
	return 0;
}


string const & InsetRef::getName(int type)
{
	return types[type].latex_name;
}


} // namespace lyx