/*
 * Copyright (c) 2013 Remko Tronçon
 * Licensed under the GNU General Public License.
 * See the COPYING file for more information.
 */

#include <Sluift/ElementConvertors/PubSubItemConvertor.h>

#include <lua.hpp>
#include <boost/smart_ptr/make_shared.hpp>
#include <boost/numeric/conversion/cast.hpp>

#include <Sluift/LuaElementConvertors.h>
#include <Swiften/Base/foreach.h>

#pragma clang diagnostic ignored "-Wunused-private-field"

using namespace Swift;

PubSubItemConvertor::PubSubItemConvertor(LuaElementConvertors* convertors) : 
		GenericLuaElementConvertor<PubSubItem>("pubsub_item"),
		convertors(convertors) {
}

PubSubItemConvertor::~PubSubItemConvertor() {
}

boost::shared_ptr<PubSubItem> PubSubItemConvertor::doConvertFromLua(lua_State* L) {
	boost::shared_ptr<PubSubItem> result = boost::make_shared<PubSubItem>();
	lua_getfield(L, -1, "data");
	if (lua_type(L, -1) == LUA_TTABLE) {
		std::vector< boost::shared_ptr<Payload> > items;
		for(size_t i = 0; i < lua_objlen(L, -1); ++i) {
			lua_pushnumber(L, i + 1);
			lua_gettable(L, -2);
			if (!lua_isnil(L, -1)) {
				if (boost::shared_ptr<Payload> payload = convertors->convertFromLua(L, -1)) {
					items.push_back(payload);
				}
			}
			lua_pop(L, 1);
		}

		result->setData(items);
	}
	lua_pop(L, 1);
	lua_getfield(L, -1, "id");
	if (lua_isstring(L, -1)) {
		result->setID(std::string(lua_tostring(L, -1)));
	}
	lua_pop(L, 1);
	return result;
}

void PubSubItemConvertor::doConvertToLua(lua_State* L, boost::shared_ptr<PubSubItem> payload) {
	lua_createtable(L, 0, 0);
	if (!payload->getData().empty()) {
		lua_createtable(L, boost::numeric_cast<int>(payload->getData().size()), 0);
		{
			int i = 0;
			foreach(boost::shared_ptr<Payload> item, payload->getData()) {
				if (convertors->convertToLua(L, item) > 0) {
					lua_rawseti(L, -2, boost::numeric_cast<int>(i+1));
					++i;
				}
			}
		}
		lua_setfield(L, -2, "data");
	}
	lua_pushstring(L, payload->getID().c_str());
	lua_setfield(L, -2, "id");
}

boost::optional<LuaElementConvertor::Documentation> PubSubItemConvertor::getDocumentation() const {
	return Documentation(
		"PubSubItem",
		"This table has the following fields:\n\n"
		"- `data`: array<element (table)>\n"
		"- `id`: string\n"
	);
}