/**
 * \file ExternalTemplate.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author Asger Alstrup Nielsen
 * \author Angus Leeming
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "ExternalTemplate.h"


#include "support/debug.h"
#include "support/filetools.h"
#include "support/Lexer.h"
#include "support/lstrings.h"
#include "support/Package.h"
#include "support/PathChanger.h"
#include "support/Translator.h"

#include <algorithm>
#include <ostream>

using namespace std;
using namespace lyx::support;

namespace lyx {
namespace external {


typedef Translator<TransformID, string> TransformIDTranslator;

static TransformIDTranslator const initIDTranslator()
{
	TransformIDTranslator translator(None, "");
	translator.addPair(Rotate, "Rotate");
	translator.addPair(Resize, "Resize");
	translator.addPair(Clip,   "Clip");
	translator.addPair(Extra,  "Extra");
	return translator;
}

static TransformIDTranslator const & transformIDTranslator()
{
	static TransformIDTranslator const translator = initIDTranslator();
	return translator;
}

// We have to have dummy default commands for security reasons!
Template::Template()
	: inputFormat("*"), automaticProduction(false), preview_mode(PREVIEW_OFF)
{}


Template::Format::Format()
{}


TemplateManager::TemplateManager()
{
	readTemplates(package().user_support());
	if (lyxerr.debugging(Debug::EXTERNAL)) {
		dumpPreambleDefs(lyxerr);
		lyxerr << '\n';
		dumpTemplates(lyxerr);
	}
}


std::function<void (TemplateManager::PreambleDefs::value_type const &)>
	DumpPreambleDef(ostream & os)
{
	return [&os](TemplateManager::PreambleDefs::value_type const & vt)
	{
		os << "PreambleDef " << vt.first << '\n'
		   << to_utf8(vt.second)
		   << "PreambleDefEnd" << endl;
	};
}


std::function<void (TemplateManager::Templates::value_type const &) >
	DumpTemplate(ostream & os)
{
	return [&os](TemplateManager::Templates::value_type const & vt) {
		Template const & et = vt.second;

		os << "Template " << et.lyxName << '\n'
		    << "\tGuiName " << et.guiName << '\n'
		    << "\tHelpText\n"
		    << to_utf8(et.helpText)
		    << "\tHelpTextEnd\n"
		    << "\tInputFormat " << et.inputFormat << '\n'
		    << "\tFileFilter " << et.fileRegExp << '\n'
		    << "\tAutomaticProduction " << et.automaticProduction << '\n'
		    << "\tPreview ";
		switch (et.preview_mode) {
			case PREVIEW_OFF:
				os << "Off\n";
				break;
			case PREVIEW_GRAPHICS:
				os << "Graphics\n";
				break;
			case PREVIEW_INSTANT:
				os << "InstantPreview\n";
				break;
		}
		typedef vector<TransformID> IDs;
		IDs::const_iterator it  = et.transformIds.begin();
		IDs::const_iterator end = et.transformIds.end();
		for (; it != end; ++it) {
			os << "\tTransform "
			    << transformIDTranslator().find(*it) << '\n';
		}

		et.dumpFormats(os);
		os << "TemplateEnd" << endl;

	};
}


std::function<void (Template::Formats::value_type const &) >
	DumpFormat (ostream & os)
{
	return [&os](Template::Formats::value_type const & vt)
	{
		Template::Format const & ft = vt.second;
		os << "\tFormat " << vt.first << '\n'
		    << "\t\tProduct " << ft.product << '\n'
		    << "\t\tUpdateFormat " << ft.updateFormat << '\n'
		    << "\t\tUpdateResult " << ft.updateResult << '\n';

		vector<string>::const_iterator qit = ft.requirements.begin();
		vector<string>::const_iterator qend = ft.requirements.end();
		for (; qit != qend; ++qit) {
			lyxerr << "req:" << *qit << endl;
			os << "\t\tRequirement " << *qit << '\n';
		}

		typedef vector<Template::Option> Options;
		Options::const_iterator oit  = ft.options.begin();
		Options::const_iterator oend = ft.options.end();
		for (; oit != oend; ++oit) {
			os << "\t\tOption "
			    << oit->name
			    << ": "
			    << oit->option
			    << '\n';
		}

		vector<string>::const_iterator pit  = ft.preambleNames.begin();
		vector<string>::const_iterator pend = ft.preambleNames.end();
		for (; pit != pend; ++pit) {
			os << "\t\tPreamble " << *pit << '\n';
		}

		typedef Template::Format::FileMap FileMap;
		FileMap::const_iterator rit  = ft.referencedFiles.begin();
		FileMap::const_iterator rend = ft.referencedFiles.end();
		for (; rit != rend; ++rit) {
			vector<string>::const_iterator fit  = rit->second.begin();
			vector<string>::const_iterator fend = rit->second.end();
			for (; fit != fend; ++fit) {
				os << "\t\tReferencedFile " << rit->first
				    << " \"" << *fit << "\"\n";
			}
		}

		os << "\tFormatEnd\n";
	};
}


void Template::dumpFormats(ostream & os) const
{
	for_each(formats.begin(), formats.end(), DumpFormat(os));
}


void TemplateManager::dumpPreambleDefs(ostream & os) const
{
	for_each(preambledefs.begin(), preambledefs.end(), DumpPreambleDef(os));
}


void TemplateManager::dumpTemplates(ostream & os) const
{
	for_each(templates.begin(), templates.end(), DumpTemplate(os));
}


TemplateManager & TemplateManager::get()
{
	static TemplateManager externalTemplateManager;
	return externalTemplateManager;
}


TemplateManager::Templates const & TemplateManager::getTemplates() const
{
	return templates;
}


Template const *
TemplateManager::getTemplateByName(string const & name) const
{
	Templates::const_iterator it = templates.find(name);
	return (it == templates.end()) ? 0 : &it->second;
}


docstring TemplateManager::getPreambleDefByName(string const & name) const
{
	string const trimmed_name = trim(name);
	if (trimmed_name.empty())
		return docstring();

	PreambleDefs::const_iterator it = preambledefs.find(trimmed_name);
	if (it == preambledefs.end())
		return docstring();

	return it->second;
}


void TemplateManager::readTemplates(FileName const & path)
{
	PathChanger p(path);

	enum {
		TM_PREAMBLEDEF = 1,
		TM_PREAMBLEDEF_END,
		TM_TEMPLATE,
		TM_TEMPLATE_END
	};

	LexerKeyword templatetags[] = {
		{ "preambledef", TM_PREAMBLEDEF },
		{ "preambledefend", TM_PREAMBLEDEF_END },
		{ "template", TM_TEMPLATE },
		{ "templateend", TM_TEMPLATE_END }
	};

	// Read the templates list
	vector<string> templateslist;
	FileName const real_file = libFileSearch("", "xtemplates.lst");
	LYXERR(Debug::EXTERNAL, "Reading external templates from `" << real_file << '\'');

	if (real_file.empty()) {
		LYXERR0("unable to find external templates file `xtemplates.lst'.\n"
			<< "No external templates will be available.");
		return;
	}

	Lexer tlex;
	if (!tlex.setFile(real_file)) {
		LYXERR0("lyxlex was not able to set file: "
			<< real_file << ".\nNo external templates will be available.");
		return;
	}

	if (!tlex.isOK()) {
		LYXERR0("unable to open external templates file  `"
			<< to_utf8(makeDisplayPath(real_file.absFileName(), 1000))
			<< "'\nNo external templates will be available.");
		return;
	}

	bool finished = false;
	// Parse external templates files
	LYXERR(Debug::EXTERNAL, "Starting parsing of xtemplates.lst");
	while (tlex.isOK() && !finished) {
		LYXERR(Debug::EXTERNAL, "\tline by line");
		switch (tlex.lex()) {
		case Lexer::LEX_FEOF:
			finished = true;
			break;
		default:
			string const name = tlex.getString();
			LYXERR(Debug::EXTERNAL, "Template name: " << name);
			templateslist.push_back(name);
			break;
		}
	}

	LYXERR(Debug::EXTERNAL, "End of parsing of xtemplates.lst");

	for (vector<string>::const_iterator it = templateslist.begin(); it != templateslist.end(); ++it) {
		FileName const filename = libFileSearch("xtemplates", *it);
		LYXERR(Debug::EXTERNAL, "Reading template file " << filename.absFileName());
		Lexer lex(templatetags);
		if (filename.empty() || !lex.setFile(filename)) {
			lex.printError("external::TemplateManager::readTemplates: "
				       "No template file");
			return;
		}

		char const * const preamble_end_tag =
			templatetags[TM_PREAMBLEDEF_END-1].tag;

		while (lex.isOK()) {
			switch (lex.lex()) {
			case TM_PREAMBLEDEF: {
				lex.next();
				string const name = lex.getString();
				preambledefs[name] = lex.getLongString(from_ascii(preamble_end_tag));
				break;
			}

			case TM_TEMPLATE: {
				lex.next();
				string const name = lex.getString();
				Template & tmp = templates[name];
				tmp.lyxName = name;
				tmp.readTemplate(lex);
				break;
			}

			case TM_TEMPLATE_END:
				lex.printError("Warning: End outside Template.");
				break;

			case TM_PREAMBLEDEF_END:
				lex.printError("Warning: End outside PreambleDef.");
				break;
			default:
				break;
			}
		}
	}
}


void Template::readTemplate(Lexer & lex)
{
	enum {
		TO_GUINAME = 1,
		TO_HELPTEXT,
		TO_INPUTFORMAT,
		TO_FILTER,
		TO_AUTOMATIC,
		TO_PREVIEW,
		TO_TRANSFORM,
		TO_FORMAT,
		TO_END
	};

	LexerKeyword templateoptiontags[] = {
		{ "automaticproduction", TO_AUTOMATIC },
		{ "filefilter", TO_FILTER },
		{ "format", TO_FORMAT },
		{ "guiname", TO_GUINAME },
		{ "helptext", TO_HELPTEXT },
		{ "inputformat", TO_INPUTFORMAT },
		{ "preview", TO_PREVIEW },
		{ "templateend", TO_END },
		{ "transform", TO_TRANSFORM }
	};

	PushPopHelper pph(lex, templateoptiontags);
	lex.setContext("Template::readTemplate");

	string token;
	while (lex.isOK()) {
		switch (lex.lex()) {
		case TO_GUINAME:
			lex.next(true);
			guiName = lex.getString();
			break;

		case TO_HELPTEXT:
			helpText = lex.getLongString(from_ascii("HelpTextEnd"));
			break;

		case TO_INPUTFORMAT:
			lex.next(true);
			inputFormat = lex.getString();
			break;

		case TO_FILTER:
			lex.next(true);
			fileRegExp = lex.getString();
			break;

		case TO_AUTOMATIC:
			lex.next();
			automaticProduction = lex.getBool();
			break;

		case TO_PREVIEW:
			lex >> token;
			if (token == "InstantPreview")
				preview_mode = PREVIEW_INSTANT;
			else if (token == "Graphics")
				preview_mode = PREVIEW_GRAPHICS;
			else
				preview_mode = PREVIEW_OFF;
			break;

		case TO_TRANSFORM: {
			lex >> token;
			TransformID id = transformIDTranslator().find(token);
			if (int(id) == -1)
				LYXERR0("Transform " << token << " is not recognized");
			else
				transformIds.push_back(id);
			break;
		}

		case TO_FORMAT:
			lex.next(true);
			formats[lex.getString()].readFormat(lex);
			break;

		case TO_END:
			return;
		}
	}
}


namespace {

void transform_not_found(ostream & os, string const & transform)
{
	os << "external::Format::readFormat. Transformation \""
	   << transform << "\" is unrecognized." << endl;
}


void transform_class_not_found(ostream & os, string const & tclass)
{
	os << "external::Format::readFormat. Transformation class \""
	   << tclass << "\" is unrecognized." << endl;
}


void setCommandFactory(Template::Format & format, string const & transform,
		       string const & transformer_class)
{
	bool class_found = false;
	if (transform == "Resize" && transformer_class == "ResizeLatexCommand") {
		class_found = true;
		ResizeCommandFactory factory = ResizeLatexCommand::factory;
		format.command_transformers[Resize] =
			TransformStore(Resize, factory);

	} else if (transform == "Rotate" &&
		   transformer_class == "RotationLatexCommand") {
		class_found = true;
		RotationCommandFactory factory = RotationLatexCommand::factory;
		format.command_transformers[Rotate] =
			TransformStore(Rotate, factory);

	} else
		transform_not_found(lyxerr, transform);

	if (!class_found)
		transform_class_not_found(lyxerr, transformer_class);
}


void setOptionFactory(Template::Format & format, string const & transform,
		string const & transformer_class)
{
	bool class_found = false;
	if (transform == "Clip" && transformer_class == "ClipLatexOption") {
		class_found = true;
		ClipOptionFactory factory = ClipLatexOption::factory;
		format.option_transformers[Clip] =
				TransformStore(Clip, factory);

	} else if (transform == "Extra" && transformer_class == "ExtraOption") {
		class_found = true;
		ExtraOptionFactory factory = ExtraOption::factory;
		format.option_transformers[Extra] =
			TransformStore(Extra, factory);

	} else if (transform == "Resize" &&
		   transformer_class == "ResizeLatexOption") {
		class_found = true;
		ResizeOptionFactory factory = ResizeLatexOption::factory;
		format.option_transformers[Resize] =
			TransformStore(Resize, factory);

	} else if (transform == "Rotate" &&
		   transformer_class == "RotationLatexOption") {
		class_found = true;
		RotationOptionFactory factory = RotationLatexOption::factory;
		format.option_transformers[Rotate] =
			TransformStore(Rotate, factory);

	} else
		transform_not_found(lyxerr, transform);

	if (!class_found)
		transform_class_not_found(lyxerr, transformer_class);
}

} // namespace


void Template::Format::readFormat(Lexer & lex)
{
	enum {
		FO_PRODUCT = 1,
		FO_UPDATEFORMAT,
		FO_UPDATERESULT,
		FO_REQUIREMENT,
		FO_OPTION,
		FO_PREAMBLE,
		FO_TRANSFORMCOMMAND,
		FO_TRANSFORMOPTION,
		FO_REFERENCEDFILE,
		FO_END
	};

	LexerKeyword formattags[] = {
		{ "formatend", FO_END },
		{ "option", FO_OPTION },
		{ "preamble", FO_PREAMBLE },
		{ "product", FO_PRODUCT },
		{ "referencedfile", FO_REFERENCEDFILE },
		{ "requirement", FO_REQUIREMENT },
		{ "transformcommand", FO_TRANSFORMCOMMAND },
		{ "transformoption", FO_TRANSFORMOPTION },
		{ "updateformat", FO_UPDATEFORMAT },
		{ "updateresult", FO_UPDATERESULT }
	};

	PushPopHelper pph(lex, formattags);

	while (lex.isOK()) {
		switch (lex.lex()) {
		case FO_PRODUCT:
			lex.next(true);
			product = lex.getString();
			break;

		case FO_UPDATEFORMAT:
			lex.next(true);
			updateFormat = lex.getString();
			break;

		case FO_UPDATERESULT:
			lex.next(true);
			updateResult = lex.getString();
			break;

		case FO_REQUIREMENT:
			lex.next(true);
			requirements.push_back(lex.getString());
			break;

		case FO_PREAMBLE:
			lex.next(true);
			preambleNames.push_back(lex.getString());
			break;

		case FO_TRANSFORMCOMMAND: {
			lex.next(true);
			string const name = lex.getString();
			lex.next(true);
			setCommandFactory(*this, name, lex.getString());
			break;
		}

		case FO_TRANSFORMOPTION: {
			lex.next(true);
			string const name = lex.getString();
			lex.next(true);
			setOptionFactory(*this, name, lex.getString());
			break;
		}

		case FO_OPTION: {
			lex.next(true);
			string const name = lex.getString();
			lex.next(true);
			string const opt = lex.getString();
			options.push_back(Option(name, opt));
			break;
		}

		case FO_REFERENCEDFILE: {
			lex.next(true);
			string const format = lex.getString();
			lex.next(true);
			string const file = lex.getString();
			referencedFiles[format].push_back(file);
			break;
		}

		case FO_END:
			return;
		}
	}
}

} // namespace external
} // namespace lyx
