/**
 * \file InsetIndex.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Lars Gullik Bjønnes
 * \author Jürgen Spitzmüller
 *
 * Full author contact details are available in file CREDITS.
 */
#include <config.h>

#include "InsetIndex.h"

#include "Buffer.h"
#include "BufferParams.h"
#include "BufferView.h"
#include "ColorSet.h"
#include "DispatchResult.h"
#include "Encoding.h"
#include "FuncRequest.h"
#include "FuncStatus.h"
#include "IndicesList.h"
#include "LaTeXFeatures.h"
#include "Lexer.h"
#include "MetricsInfo.h"
#include "sgml.h"
#include "TocBackend.h"

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

#include "frontends/alert.h"

#include <ostream>

using namespace std;
using namespace lyx::support;

namespace lyx {

/////////////////////////////////////////////////////////////////////
//
// InsetIndex
//
///////////////////////////////////////////////////////////////////////


InsetIndex::InsetIndex(Buffer const & buf, InsetIndexParams const & params)
	: InsetCollapsable(buf), params_(params)
{}


int InsetIndex::latex(odocstream & os,
		      OutputParams const & runparams) const
{
	if (buffer().masterBuffer()->params().use_indices && !params_.index.empty()
	    && params_.index != "idx") {
		os << "\\sindex[";
		os << params_.index;
		os << "]{";
	} else {
		os << "\\index";
		os << '{';
	}
	int i = 0;

	// get contents of InsetText as LaTeX and plaintext
	odocstringstream ourlatex;
	InsetText::latex(ourlatex, runparams);
	odocstringstream ourplain;
	InsetText::plaintext(ourplain, runparams);
	docstring latexstr = ourlatex.str();
	docstring plainstr = ourplain.str();

	// this will get what follows | if anything does
	docstring cmd;

	// check for the | separator
	// FIXME This would go wrong on an escaped "|", but
	// how far do we want to go here?
	size_t pos = latexstr.find(from_ascii("|"));
	if (pos != docstring::npos) {
		// put the bit after "|" into cmd...
		cmd = latexstr.substr(pos + 1);
		// ...and erase that stuff from latexstr
		latexstr = latexstr.erase(pos);
		// ...and similarly from plainstr
		size_t ppos = plainstr.find(from_ascii("|"));
		if (ppos < plainstr.size())
			plainstr.erase(ppos);
		else
			LYXERR0("The `|' separator was not found in the plaintext version!");
	}

	// Separate the entires and subentries, i.e., split on "!"
	// FIXME This would do the wrong thing with escaped ! characters
	std::vector<docstring> const levels =
		getVectorFromString(latexstr, from_ascii("!"), true);
	std::vector<docstring> const levels_plain =
		getVectorFromString(plainstr, from_ascii("!"), true);

	vector<docstring>::const_iterator it = levels.begin();
	vector<docstring>::const_iterator end = levels.end();
	vector<docstring>::const_iterator it2 = levels_plain.begin();
	bool first = true;
	for (; it != end; ++it) {
		// write the separator except the first time
		if (!first)
			os << '!';
		else
			first = false;

		// correctly sort macros and formatted strings
		// if we do find a command, prepend a plain text
		// version of the content to get sorting right,
		// e.g. \index{LyX@\LyX}, \index{text@\textbf{text}}
		// Don't do that if the user entered '@' himself, though.
		if (contains(*it, '\\') && !contains(*it, '@')) {
			// Plaintext might return nothing (e.g. for ERTs)
			docstring const spart = 
				(it2 < levels_plain.end() && !(*it2).empty())
				? *it2 : *it;
			// Now we need to validate that all characters in
			// the sorting part are representable in the current
			// encoding. If not try the LaTeX macro which might
			// or might not be a good choice, and issue a warning.
			docstring spart2;
			for (size_t n = 0; n < spart.size(); ++n) {
				try {
					spart2 += runparams.encoding->latexChar(spart[n]);
				} catch (EncodingException & /* e */) {
					LYXERR0("Uncodable character in index entry. Sorting might be wrong!");
				}
			}
			if (spart != spart2 && !runparams.dryrun) {
				// FIXME: warning should be passed to the error dialog
				frontend::Alert::warning(_("Index sorting failed"),
				bformat(_("LyX's automatic index sorting algorithm faced\n"
				  "problems with the entry '%1$s'.\n"
				  "Please specify the sorting of this entry manually, as\n"
				  "explained in the User Guide."), spart));
			}
			// remove remaining \'s for the sorting part
			docstring const ppart =
				subst(spart2, from_ascii("\\"), docstring());
			os << ppart;
			os << '@';
		}
		docstring const tpart = *it;
		os << tpart;
		if (it2 < levels_plain.end())
			++it2;
	}
	// write the bit that followed "|"
	if (!cmd.empty())
		os << "|" << cmd;
	os << '}';
	return i;
}


int InsetIndex::docbook(odocstream & os, OutputParams const & runparams) const
{
	os << "<indexterm><primary>";
	int const i = InsetText::docbook(os, runparams);
	os << "</primary></indexterm>";
	return i;
}


bool InsetIndex::showInsetDialog(BufferView * bv) const
{
	bv->showDialog("index", params2string(params_),
			const_cast<InsetIndex *>(this));
	return true;
}


void InsetIndex::doDispatch(Cursor & cur, FuncRequest & cmd)
{
	switch (cmd.action) {

	case LFUN_INSET_MODIFY: {
		if (cmd.getArg(0) == "changetype") {
			params_.index = from_utf8(cmd.getArg(1));
			setLayout(cur.buffer()->params());
			break;
		}
		InsetIndexParams params;
		InsetIndex::string2params(to_utf8(cmd.argument()), params);
		params_.index = params.index;
		setLayout(cur.buffer()->params());
		break;
	}

	case LFUN_INSET_DIALOG_UPDATE:
		cur.bv().updateDialog("index", params2string(params_));
		break;

	default:
		InsetCollapsable::doDispatch(cur, cmd);
		break;
	}
}


bool InsetIndex::getStatus(Cursor & cur, FuncRequest const & cmd,
		FuncStatus & flag) const
{
	switch (cmd.action) {

	case LFUN_INSET_MODIFY:
		if (cmd.getArg(0) == "changetype") {
			docstring const newtype = from_utf8(cmd.getArg(1));
			Buffer const & realbuffer = *buffer().masterBuffer();
			IndicesList const & indiceslist = realbuffer.params().indiceslist();
			Index const * index = indiceslist.findShortcut(newtype);
			flag.setEnabled(index != 0);
			flag.setOnOff(
				from_utf8(cmd.getArg(1)) == params_.index);
			return true;
		}
		flag.setEnabled(true);
		return true;

	case LFUN_INSET_DIALOG_UPDATE: {
		Buffer const & realbuffer = *buffer().masterBuffer();
		flag.setEnabled(realbuffer.params().use_indices);
		return true;
	}

	default:
		return InsetCollapsable::getStatus(cur, cmd, flag);
	}
}


docstring const InsetIndex::buttonLabel(BufferView const & bv) const
{
	docstring s = _("Idx");
	if (decoration() == InsetLayout::CLASSIC)
		return isOpen(bv) ? s : getNewLabel(s);
	else
		return getNewLabel(s);
}


docstring InsetIndex::toolTip(BufferView const &, int, int) const
{
	docstring tip = _("Index Entry");
	if (buffer().params().use_indices && !params_.index.empty()) {
		Buffer const & realbuffer = *buffer().masterBuffer();
		IndicesList const & indiceslist = realbuffer.params().indiceslist();
		tip += " (";
		Index const * index = indiceslist.findShortcut(params_.index);
		if (!index)
			tip += _("unknown type!");
		else
			tip += index->index();
		tip += ")";
	}
	tip += ": ";
	OutputParams rp(&buffer().params().encoding());
	odocstringstream ods;
	InsetText::plaintext(ods, rp);
	tip += ods.str();
	// shorten it if necessary
	if (tip.size() > 200)
		tip = tip.substr(0, 200) + "...";
	return tip;
}


void InsetIndex::write(ostream & os) const
{
	os << to_utf8(name());
	params_.write(os);
	InsetCollapsable::write(os);
}


void InsetIndex::read(Lexer & lex)
{
	params_.read(lex);
	InsetCollapsable::read(lex);
}


string InsetIndex::params2string(InsetIndexParams const & params)
{
	ostringstream data;
	data << "index";
	params.write(data);
	return data.str();
}


void InsetIndex::string2params(string const & in, InsetIndexParams & params)
{
	params = InsetIndexParams();
	if (in.empty())
		return;

	istringstream data(in);
	Lexer lex;
	lex.setStream(data);
	lex.setContext("InsetIndex::string2params");
	lex >> "index";
	params.read(lex);
}


void InsetIndex::addToToc(DocIterator const & cpit)
{
	DocIterator pit = cpit;
	pit.push_back(CursorSlice(*this));
	docstring const item = text().asString(0, 1, AS_STR_LABEL | AS_STR_INSETS);
	buffer().tocBackend().toc("index").push_back(TocItem(pit, 0, item));
	// Proceed with the rest of the inset.
	InsetCollapsable::addToToc(cpit);
}


void InsetIndex::validate(LaTeXFeatures & features) const
{
	if (buffer().masterBuffer()->params().use_indices
	    && !params_.index.empty()
	    && params_.index != "idx")
		features.require("splitidx");
}


docstring InsetIndex::contextMenu(BufferView const &, int, int) const
{
	return from_ascii("context-index");
}


bool InsetIndex::hasSettings() const
{
	return buffer().masterBuffer()->params().use_indices;
}




/////////////////////////////////////////////////////////////////////
//
// InsetIndexParams
//
///////////////////////////////////////////////////////////////////////


void InsetIndexParams::write(ostream & os) const
{
	os << ' ';
	if (!index.empty())
		os << to_utf8(index);
	else
		os << "idx";
	os << '\n';
}


void InsetIndexParams::read(Lexer & lex)
{
	if (lex.eatLine())
		index = lex.getDocString();
	else
		index = from_ascii("idx");
}


/////////////////////////////////////////////////////////////////////
//
// InsetPrintIndex
//
///////////////////////////////////////////////////////////////////////

InsetPrintIndex::InsetPrintIndex(InsetCommandParams const & p)
	: InsetCommand(p, "index_print")
{}


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


docstring InsetPrintIndex::screenLabel() const
{
	if ((!buffer().masterBuffer()->params().use_indices
	     && getParam("type") == from_ascii("idx"))
	    || getParam("type").empty())
		return _("Index");
	Buffer const & realbuffer = *buffer().masterBuffer();
	IndicesList const & indiceslist = realbuffer.params().indiceslist();
	Index const * index = indiceslist.findShortcut(getParam("type"));
	if (!index)
		return _("Unknown index type!");
	docstring res = index->index();
	if (!buffer().masterBuffer()->params().use_indices)
		res += " (" + _("non-active") + ")";
	return res;
}


void InsetPrintIndex::doDispatch(Cursor & cur, FuncRequest & cmd)
{
	switch (cmd.action) {

	case LFUN_INSET_MODIFY: {
		InsetCommandParams p(INDEX_PRINT_CODE);
		// FIXME UNICODE
		InsetCommand::string2params("index_print",
			to_utf8(cmd.argument()), p);
		if (p.getCmdName().empty()) {
			cur.noUpdate();
			break;
		}
		setParam("type", p["type"]);
		break;
	}

	default:
		InsetCommand::doDispatch(cur, cmd);
		break;
	}
}


bool InsetPrintIndex::getStatus(Cursor & cur, FuncRequest const & cmd,
	FuncStatus & status) const
{
	switch (cmd.action) {

	case LFUN_INSET_MODIFY: {
		if (cmd.getArg(0) == "index_print"
		    && cmd.getArg(1) == "CommandInset") {
			InsetCommandParams p(INDEX_PRINT_CODE);
			InsetCommand::string2params("index_print",
				to_utf8(cmd.argument()), p);
			Buffer const & realbuffer = *buffer().masterBuffer();
			IndicesList const & indiceslist =
				realbuffer.params().indiceslist();
			Index const * index = indiceslist.findShortcut(p["type"]);
			status.setEnabled(index != 0);
			status.setOnOff(p["type"] == getParam("type"));
			return true;
		} else
			return InsetCommand::getStatus(cur, cmd, status);
	}
	
	case LFUN_INSET_DIALOG_UPDATE: {
		Buffer const & realbuffer = *buffer().masterBuffer();
		status.setEnabled(realbuffer.params().use_indices);
		return true;
	}

	default:
		return InsetCommand::getStatus(cur, cmd, status);
	}
}


int InsetPrintIndex::latex(odocstream & os, OutputParams const &) const
{
	if (!buffer().masterBuffer()->params().use_indices) {
		if (getParam("type") == from_ascii("idx"))
			os << "\\printindex{}";
		return 0;
	}
	os << getCommand();
	return 0;
}


void InsetPrintIndex::validate(LaTeXFeatures & features) const
{
	features.require("makeidx");
	if (buffer().masterBuffer()->params().use_indices)
		features.require("splitidx");
}


docstring InsetPrintIndex::contextMenu(BufferView const &, int, int) const
{
	return buffer().masterBuffer()->params().use_indices ?
		from_ascii("context-indexprint") : docstring();
}


bool InsetPrintIndex::hasSettings() const
{
	return buffer().masterBuffer()->params().use_indices;
}


} // namespace lyx