/*
 * Copyright (c) 2013-2016 Isode Limited.
 * All rights reserved.
 * See the COPYING file for more information.
 */

#include <Sluift/Lua/FunctionRegistry.h>

#include <Swiften/Base/foreach.h>

#include <Sluift/Lua/Exception.h>
#include <Sluift/Lua/LuaUtils.h>
#include <Sluift/globals.h>

using namespace Swift::Lua;

FunctionRegistry::FunctionRegistry() {
}

FunctionRegistry::~FunctionRegistry() {
}

FunctionRegistry& FunctionRegistry::getInstance() {
	static FunctionRegistry instance;
	return instance;
}

void FunctionRegistry::addFunction(
		const std::string& name, lua_CFunction function, const std::string& type,
		const std::string& helpDescription, const std::string& helpParameters, const std::string& helpOptions) {
	Registration registration;
	registration.name = name;
	registration.function = function;
	registration.type = type;
	registration.helpDescription = helpDescription;
	registration.helpParameters = helpParameters;
	registration.helpOptions = helpOptions;
	registrations.push_back(registration);
}

void FunctionRegistry::createFunctionTable(lua_State* L, const std::string& type) {
	lua_newtable(L);
	addFunctionsToTable(L, type);
}

void FunctionRegistry::addFunctionsToTable(lua_State* L, const std::string& type) {
	foreach(const Registration& registration, registrations) {
		if (registration.type == type) {
			lua_pushcclosure(L, registration.function, 0);
			if (!registration.helpDescription.empty()) {
				Lua::registerHelp(L, -1, registration.helpDescription, registration.helpParameters, registration.helpOptions);
			}
			else {
				Lua::registerExtraHelp(L, -1, registration.type + "." + registration.name);
			}
			lua_setfield(L, -2, registration.name.c_str());
		}
	}
}