ScriptAPI.cpp
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ScriptAPI.cpp
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	/*
	* Copyright (C) 2012-2013 Me and My Shadow
	*
	* This file is part of Me and My Shadow.
	*
	* Me and My Shadow is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation, either version 3 of the License, or
	* (at your option) any later version.
	*
	* Me and My Shadow is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	* You should have received a copy of the GNU General Public License
	* along with Me and My Shadow. If not, see <http://www.gnu.org/licenses/>.
	*/

	#include "ScriptAPI.h"
	#include "ScriptExecutor.h"
	#include "SoundManager.h"
	#include "Functions.h"
	#include "Block.h"
	#include "Game.h"
	#include "MusicManager.h"
	#include "ScriptDelayExecution.h"
	#include <iostream>
	#include <algorithm>
	using namespace std;

	/////////////////////////// HELPER MACRO ///////////////////////////

	#define HELPER_GET_AND_CHECK_ARGS(ARGS) \
	int args = lua_gettop(state); \
	if(args != ARGS) { \
	return luaL_error(state, "Incorrect number of arguments for %s, expected %d.", __FUNCTION__, ARGS); \
	}

	#define HELPER_GET_AND_CHECK_ARGS_RANGE(ARGS1, ARGS2) \
	int args = lua_gettop(state); \
	if(args < ARGS1 \|\| args > ARGS2) { \
	return luaL_error(state, "Incorrect number of arguments for %s, expected %d-%d.", __FUNCTION__, ARGS1, ARGS2); \
	}

	#define HELPER_GET_AND_CHECK_ARGS_2(ARGS1, ARGS2) \
	int args = lua_gettop(state); \
	if(args != ARGS1 && args != ARGS2) { \
	return luaL_error(state, "Incorrect number of arguments for %s, expected %d or %d.", __FUNCTION__, ARGS1, ARGS2); \
	}

	#define HELPER_GET_AND_CHECK_ARGS_AT_LEAST(ARGS) \
	int args = lua_gettop(state); \
	if(args < ARGS) { \
	return luaL_error(state, "Incorrect number of arguments for %s, expected at least %d.", __FUNCTION__, ARGS); \
	}

	#define HELPER_GET_AND_CHECK_ARGS_AT_MOST(ARGS) \
	int args = lua_gettop(state); \
	if(args > ARGS) { \
	return luaL_error(state, "Incorrect number of arguments for %s, expected at most %d.", __FUNCTION__, ARGS); \
	}

	//================================================================

	#define HELPER_CHECK_ARGS_TYPE(INDEX, TYPE) \
	if(!lua_is##TYPE(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s, should be %s.", INDEX, __FUNCTION__, #TYPE); \
	}

	#define HELPER_CHECK_ARGS_TYPE_NO_HINT(INDEX, TYPE) \
	if(!lua_is##TYPE(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s.", INDEX, __FUNCTION__); \
	}

	#define HELPER_CHECK_ARGS_TYPE_2(INDEX, TYPE1, TYPE2) \
	if(!lua_is##TYPE1(state,INDEX) && !lua_is##TYPE2(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s, should be %s or %s.", INDEX, __FUNCTION__, #TYPE1, #TYPE2); \
	}

	#define HELPER_CHECK_ARGS_TYPE_2_NO_HINT(INDEX, TYPE1, TYPE2) \
	if(!lua_is##TYPE1(state,INDEX) && !lua_is##TYPE2(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s.", INDEX, __FUNCTION__); \
	}

	#define HELPER_CHECK_ARGS_TYPE_OR_NIL(INDEX, TYPE) \
	HELPER_CHECK_ARGS_TYPE_2(INDEX, TYPE, nil)

	#define HELPER_CHECK_ARGS_TYPE_OR_NIL_NO_HINT(INDEX, TYPE) \
	HELPER_CHECK_ARGS_TYPE_2_NO_HINT(INDEX, TYPE, nil)

	//================================================================

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE(INDEX, TYPE) \
	if(args>=INDEX && !lua_is##TYPE(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s, should be %s.", INDEX, __FUNCTION__, #TYPE); \
	}

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE_NO_HINT(INDEX, TYPE) \
	if(args>=INDEX && !lua_is##TYPE(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s.", INDEX, __FUNCTION__); \
	}

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE_2(INDEX, TYPE1, TYPE2) \
	if(args>=INDEX && !lua_is##TYPE1(state,INDEX) && !lua_is##TYPE2(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s, should be %s or %s.", INDEX, __FUNCTION__, #TYPE1, #TYPE2); \
	}

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE_2_NO_HINT(INDEX, TYPE1, TYPE2) \
	if(args>=INDEX && !lua_is##TYPE1(state,INDEX) && !lua_is##TYPE2(state,INDEX)) { \
	return luaL_error(state, "Invalid type for argument %d of %s.", INDEX, __FUNCTION__); \
	}

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(INDEX, TYPE) \
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_2(INDEX, TYPE, nil)

	#define HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL_NO_HINT(INDEX, TYPE) \
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_2_NO_HINT(INDEX, TYPE, nil)

	//================================================================

	#define HELPER_REGISTER_IS_VALID_FUNCTION(CLASS) \
	int isValid(lua_State* state){ \
	HELPER_GET_AND_CHECK_ARGS(1); \
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata); \
	CLASS* object = CLASS::getObjectFromUserData(state, 1); \
	lua_pushboolean(state, object ? 1 : 0); \
	return 1; \
	}

	//================================================================

	#define _F(FUNC) { #FUNC, _L::FUNC }
	#define _FG(FUNC) _F(get##FUNC)
	#define _FI(FUNC) _F(is##FUNC)
	#define _FS(FUNC) _F(set##FUNC)
	#define _FGS(FUNC) _F(get##FUNC), _F(set##FUNC)
	#define _FIS(FUNC) _F(is##FUNC), _F(set##FUNC)

	///////////////////////////BLOCK SPECIFIC///////////////////////////

	class BlockScriptAPI {
	public:
	static int getFlags(const Block* block) {
	return block->flags;
	}
	static void setFlags(Block* block, int flags) {
	block->flags = flags;
	}
	static void fragileUpdateState(Block* block, int state) {
	state &= 0x3;
	block->flags = (block->flags & ~0x3) \| state;
	const char* s = (state == 0) ? "default" : ((state == 1) ? "fragile1" : ((state == 2) ? "fragile2" : "fragile3"));
	block->appearance.changeState(s);
	}
	static int getTemp(const Block* block) {
	return block->temp;
	}
	static void setTemp(Block* block, int value) {
	block->temp = value;
	}
	static int getSpeed(const Block* block) {
	return block->speed;
	}
	static void setSpeed(Block* block, int value) {
	block->speed = value;
	}
	};

	namespace block {

	HELPER_REGISTER_IS_VALID_FUNCTION(Block);

	int getBlockById(lua_State* state){
	//Get the number of args, this MUST be one.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Make sure the given argument is an id (string).
	HELPER_CHECK_ARGS_TYPE(1, string);

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Get the actual game object.
	string id = lua_tostring(state, 1);
	std::vector<Block*>& levelObjects = game->levelObjects;
	Block* object = NULL;
	for (unsigned int i = 0; i < levelObjects.size(); i++){
	if (levelObjects[i]->getEditorProperty("id") == id){
	object = levelObjects[i];
	break;
	}
	}
	if (object == NULL){
	//Unable to find the requested object.
	//Return nothing, will result in a nil in the script.
	return 0;
	}

	//Create the userdatum.
	object->createUserData(state, "block");

	//We return one object, the userdatum.
	return 1;
	}

	int getBlocksById(lua_State* state){
	//Get the number of args, this MUST be one.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Make sure the given argument is an id (string).
	HELPER_CHECK_ARGS_TYPE(1, string);

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Get the actual game object.
	string id = lua_tostring(state, 1);
	std::vector<Block*>& levelObjects = game->levelObjects;
	std::vector<Block*> result;
	for (unsigned int i = 0; i < levelObjects.size(); i++){
	if (levelObjects[i]->getEditorProperty("id") == id){
	result.push_back(levelObjects[i]);
	}
	}

	//Create the table that will hold the result.
	lua_createtable(state, result.size(), 0);

	//Loop through the results.
	for (unsigned int i = 0; i < result.size(); i++){
	//Create the userdatum.
	result[i]->createUserData(state, "block");
	//And set the table.
	lua_rawseti(state, -2, i + 1);
	}

	//We return one object, the userdatum.
	return 1;
	}

	int moveTo(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_ARGS_TYPE(3, integer);

	//Now get the pointer to the object.
	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	int x = lua_tointeger(state, 2);
	int y = lua_tointeger(state, 3);
	object->moveTo(x, y);

	return 0;
	}

	int getLocation(lua_State* state){
	//Make sure there's only one argument and that argument is an userdatum.
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Get the object.
	lua_pushinteger(state, object->getBox().x);
	lua_pushinteger(state, object->getBox().y);
	return 2;
	}

	int setLocation(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_ARGS_TYPE(3, integer);

	//Now get the pointer to the object.
	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	int x = lua_tointeger(state, 2);
	int y = lua_tointeger(state, 3);
	object->setLocation(x, y);

	return 0;
	}

	int growTo(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_ARGS_TYPE(3, integer);

	//Now get the pointer to the object.
	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	int w = lua_tointeger(state, 2);
	int h = lua_tointeger(state, 3);
	object->growTo(w, h);

	return 0;
	}

	int getSize(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Get the object.
	lua_pushinteger(state, object->getBox().w);
	lua_pushinteger(state, object->getBox().h);
	return 2;
	}

	int setSize(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_ARGS_TYPE(3, integer);

	//Now get the pointer to the object.
	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	int w = lua_tointeger(state, 2);
	int h = lua_tointeger(state, 3);
	object->setSize(w, h);

	return 0;
	}

	int getType(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL \|\| object->type < 0 \|\| object->type >= TYPE_MAX) return 0;

	lua_pushstring(state, Game::blockName[object->type]);
	return 1;
	}

	int changeThemeState(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, string);

	Block* object = Block::getObjectFromUserData(state, 1);
	object->appearance.changeState(lua_tostring(state, 2));

	return 0;
	}

	int setVisible(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, boolean);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL)
	return 0;

	BlockScriptAPI::setFlags(object,
	(BlockScriptAPI::getFlags(object) & ~0x80000000) \| (lua_toboolean(state, 2) ? 0 : 0x80000000)
	);

	return 0;
	}

	int isVisible(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL)
	return 0;

	lua_pushboolean(state, (BlockScriptAPI::getFlags(object) & 0x80000000) ? 0 : 1);
	return 1;
	}

	int getEventHandler(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, string);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Check event type
	string eventType = lua_tostring(state, 2);
	map<string, int>::iterator it = Game::gameObjectEventNameMap.find(eventType);
	if (it == Game::gameObjectEventNameMap.end()) return 0;

	//Check compiled script
	map<int, int>::iterator script = object->compiledScripts.find(it->second);
	if (script == object->compiledScripts.end()) return 0;

	//Get event handler
	lua_rawgeti(state, LUA_REGISTRYINDEX, script->second);
	return 1;
	}

	//It will return old event handler.
	int setEventHandler(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, string);
	HELPER_CHECK_ARGS_TYPE_OR_NIL(3, function);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Check event type
	string eventType = lua_tostring(state, 2);
	map<string, int>::const_iterator it = Game::gameObjectEventNameMap.find(eventType);
	if (it == Game::gameObjectEventNameMap.end()){
	lua_pushfstring(state, "Unknown block event type: '%s'.", eventType.c_str());
	return lua_error(state);
	}

	//Check compiled script
	int scriptIndex = LUA_REFNIL;
	{
	map<int, int>::iterator script = object->compiledScripts.find(it->second);
	if (script != object->compiledScripts.end()) scriptIndex = script->second;
	}

	//Set new event handler
	object->compiledScripts[it->second] = luaL_ref(state, LUA_REGISTRYINDEX);

	if (scriptIndex == LUA_REFNIL) return 0;

	//Get old event handler and unreference it
	lua_rawgeti(state, LUA_REGISTRYINDEX, scriptIndex);
	luaL_unref(state, LUA_REGISTRYINDEX, scriptIndex);
	return 1;
	}

	int onEvent(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, string);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Check event type
	string eventType = lua_tostring(state, 2);
	map<string, int>::const_iterator it = Game::gameObjectEventNameMap.find(eventType);
	if (it == Game::gameObjectEventNameMap.end()){
	lua_pushfstring(state, "Unknown block event type: '%s'.", eventType.c_str());
	return lua_error(state);
	}

	object->onEvent(it->second);

	return 0;
	}

	int isActivated(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	case TYPE_CONVEYOR_BELT:
	case TYPE_SHADOW_CONVEYOR_BELT:
	lua_pushboolean(state, (BlockScriptAPI::getFlags(object) & 0x1) ? 0 : 1);
	return 1;
	default:
	return 0;
	}
	}

	int setActivated(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, boolean);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	case TYPE_CONVEYOR_BELT:
	case TYPE_SHADOW_CONVEYOR_BELT:
	BlockScriptAPI::setFlags(object,
	(BlockScriptAPI::getFlags(object) & ~1) \| (lua_toboolean(state, 2) ? 0 : 1)
	);
	break;
	}

	return 0;
	}

	int isAutomatic(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_PORTAL:
	lua_pushboolean(state, (BlockScriptAPI::getFlags(object) & 0x1) ? 1 : 0);
	return 1;
	default:
	return 0;
	}
	}

	int setAutomatic(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, boolean);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_PORTAL:
	BlockScriptAPI::setFlags(object,
	(BlockScriptAPI::getFlags(object) & ~1) \| (lua_toboolean(state, 2) ? 1 : 0)
	);
	break;
	}

	return 0;
	}

	int getBehavior(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_BUTTON:
	case TYPE_SWITCH:
	switch (BlockScriptAPI::getFlags(object) & 0x3) {
	default:
	lua_pushstring(state, "toggle");
	break;
	case 1:
	lua_pushstring(state, "on");
	break;
	case 2:
	lua_pushstring(state, "off");
	break;
	}
	return 1;
	default:
	return 0;
	}
	}

	int setBehavior(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, string);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_BUTTON:
	case TYPE_SWITCH:
	{
	int newFlags = BlockScriptAPI::getFlags(object) & ~3;
	std::string s = lua_tostring(state, 2);
	if (s == "on") newFlags \|= 1;
	else if (s == "off") newFlags \|= 2;
	BlockScriptAPI::setFlags(object, newFlags);
	}
	break;
	}

	return 0;
	}

	int getState(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_FRAGILE:
	lua_pushinteger(state, BlockScriptAPI::getFlags(object) & 0x3);
	return 1;
	default:
	return 0;
	}
	}

	int setState(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_FRAGILE:
	{
	int oldState = BlockScriptAPI::getFlags(object) & 0x3;
	int newState = (int)lua_tointeger(state, 2);
	if (newState < 0) newState = 0;
	else if (newState > 3) newState = 3;
	if (newState != oldState) {
	BlockScriptAPI::fragileUpdateState(object, newState);
	}
	}
	break;
	}

	return 0;
	}

	int isPlayerOn(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_BUTTON:
	lua_pushboolean(state, (BlockScriptAPI::getFlags(object) & 0x4) ? 1 : 0);
	return 1;
	default:
	return 0;
	}
	}

	int getPathMaxTime(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	lua_pushinteger(state, object->getPathMaxTime());
	return 1;
	default:
	return 0;
	}
	}

	int getPathTime(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	lua_pushinteger(state, BlockScriptAPI::getTemp(object));
	return 1;
	default:
	return 0;
	}
	}

	int setPathTime(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	BlockScriptAPI::setTemp(object, (int)lua_tointeger(state, 2));
	break;
	}

	return 0;
	}

	int isLooping(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	lua_pushboolean(state, (BlockScriptAPI::getFlags(object) & 0x2) ? 0 : 1);
	return 1;
	default:
	return 0;
	}
	}

	int setLooping(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, boolean);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_MOVING_BLOCK:
	case TYPE_MOVING_SHADOW_BLOCK:
	case TYPE_MOVING_SPIKES:
	BlockScriptAPI::setFlags(object,
	(BlockScriptAPI::getFlags(object) & ~2) \| (lua_toboolean(state, 2) ? 0 : 2)
	);
	break;
	}

	return 0;
	}

	int getSpeed(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_CONVEYOR_BELT:
	case TYPE_SHADOW_CONVEYOR_BELT:
	lua_pushinteger(state, BlockScriptAPI::getSpeed(object));
	return 1;
	default:
	return 0;
	}
	}

	int setSpeed(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	Block* object = Block::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	switch (object->type) {
	case TYPE_CONVEYOR_BELT:
	case TYPE_SHADOW_CONVEYOR_BELT:
	BlockScriptAPI::setSpeed(object, (int)lua_tointeger(state, 2));
	break;
	}

	return 0;
	}

	}

	#define _L block
	//Array with the methods for the block library.
	static const struct luaL_Reg blocklib_m[]={
	_FI(Valid),
	_FG(BlockById),
	_FG(BlocksById),
	_F(moveTo),
	_FGS(Location),
	_F(growTo),
	_FGS(Size),
	_FG(Type),
	_F(changeThemeState),
	_FIS(Visible),
	_FGS(EventHandler),
	_F(onEvent),
	_FIS(Activated),
	_FIS(Automatic),
	_FGS(Behavior),
	_FGS(State),
	_FI(PlayerOn),
	_FG(PathMaxTime),
	_FGS(PathTime),
	_FIS(Looping),
	_FGS(Speed),
	{ NULL, NULL }
	};
	#undef _L

	int luaopen_block(lua_State* state){
	luaL_newlib(state,blocklib_m);

	//Create the metatable for the block userdata.
	luaL_newmetatable(state,"block");

	lua_pushstring(state,"__index");
	lua_pushvalue(state,-2);
	lua_settable(state,-3);

	Block::registerMetatableFunctions(state,-3);

	//Register the functions and methods.
	luaL_setfuncs(state,blocklib_m,0);
	return 1;
	}

	//////////////////////////PLAYER SPECIFIC///////////////////////////

	class PlayerScriptAPI {
	public:
	static bool isInAir(Player* player) {
	return player->inAir;
	}
	static bool canMode(Player* player) {
	return player->canMove;
	}
	static bool isDead(Player* player) {
	return player->dead;
	}
	static bool isHoldingOther(Player* player) {
	return player->holdingOther;
	}
	};

	struct PlayerUserDatum{
	char sig1,sig2,sig3,sig4;
	};

	Player* getPlayerFromUserData(lua_State* state,int idx){
	PlayerUserDatum* ud=(PlayerUserDatum*)lua_touserdata(state,1);
	//Make sure the user datum isn't null.
	if(!ud) return NULL;

	//Get the game state.
	Game* game=dynamic_cast<Game*>(currentState);
	if(game==NULL) return NULL;

	Player* player=NULL;

	//Check the signature to see if it's the player or the shadow.
	if(ud->sig1=='P' && ud->sig2=='L' && ud->sig3=='Y' && ud->sig4=='R')
	player=&game->player;
	else if(ud->sig1=='S' && ud->sig2=='H' && ud->sig3=='D' && ud->sig4=='W')
	player=&game->shadow;

	return player;
	}

	namespace playershadow {

	int getLocation(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	//Get the object.
	lua_pushinteger(state, player->getBox().x);
	lua_pushinteger(state, player->getBox().y);
	return 2;
	}

	int setLocation(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_ARGS_TYPE(3, integer);

	//Get the player.
	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	//Get the new location.
	int x = lua_tointeger(state, 2);
	int y = lua_tointeger(state, 3);
	player->setLocation(x, y);

	return 0;
	}

	int jump(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS_2(1, 2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE(2, integer);

	//Get the player.
	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	//Get the new location.
	if (args == 2){
	int yVel = lua_tointeger(state, 2);
	player->jump(yVel);
	} else{
	//Use default jump strength.
	player->jump();
	}

	return 0;
	}

	int isShadow(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	lua_pushboolean(state, player->isShadow());
	return 1;
	}

	int getCurrentStand(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	//Get the actual game object.
	Block* object = player->getObjCurrentStand();
	if (object == NULL){
	return 0;
	}

	//Create the userdatum.
	object->createUserData(state, "block");

	//We return one object, the userdatum.
	return 1;
	}

	int isInAir(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	lua_pushboolean(state, PlayerScriptAPI::isInAir(player));
	return 1;
	}

	int canMove(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	lua_pushboolean(state, PlayerScriptAPI::canMode(player));
	return 1;
	}

	int isDead(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	lua_pushboolean(state, PlayerScriptAPI::isDead(player));
	return 1;
	}

	int isHoldingOther(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	Player* player = getPlayerFromUserData(state, 1);
	if (player == NULL) return 0;

	lua_pushboolean(state, PlayerScriptAPI::isHoldingOther(player));
	return 1;
	}
	}

	#define _L playershadow
	//Array with the methods for the player and shadow library.
	static const struct luaL_Reg playerlib_m[]={
	_FGS(Location),
	_F(jump),
	_FI(Shadow),
	_FG(CurrentStand),
	_FI(InAir),
	_F(canMove),
	_FI(Dead),
	_FI(HoldingOther),
	{ NULL, NULL }
	};
	#undef _L

	int luaopen_player(lua_State* state){
	luaL_newlib(state,playerlib_m);

	//Create the metatable for the player userdata.
	luaL_newmetatable(state,"player");

	lua_pushstring(state,"__index");
	lua_pushvalue(state,-2);
	lua_settable(state,-3);

	//Now create two default player user data, one for the player and one for the shadow.
	PlayerUserDatum* ud=(PlayerUserDatum*)lua_newuserdata(state,sizeof(PlayerUserDatum));
	ud->sig1='P';ud->sig2='L';ud->sig3='Y';ud->sig4='R';
	luaL_getmetatable(state,"player");
	lua_setmetatable(state,-2);
	lua_setglobal(state,"player");

	ud=(PlayerUserDatum*)lua_newuserdata(state,sizeof(PlayerUserDatum));
	ud->sig1='S';ud->sig2='H';ud->sig3='D';ud->sig4='W';
	luaL_getmetatable(state,"player");
	lua_setmetatable(state,-2);
	lua_setglobal(state,"shadow");

	//Register the functions and methods.
	luaL_setfuncs(state,playerlib_m,0);
	return 1;
	}

	//////////////////////////LEVEL SPECIFIC///////////////////////////

	namespace level {

	int getSize(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Returns level size.
	lua_pushinteger(state, LEVEL_WIDTH);
	lua_pushinteger(state, LEVEL_HEIGHT);
	return 2;
	}

	int getWidth(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Returns level size.
	lua_pushinteger(state, LEVEL_WIDTH);
	return 1;
	}

	int getHeight(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Returns level size.
	lua_pushinteger(state, LEVEL_HEIGHT);
	return 1;
	}

	int getName(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Returns level name.
	lua_pushstring(state, game->getLevelName().c_str());
	return 1;
	}

	int getEventHandler(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string);

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Check event type
	string eventType = lua_tostring(state, 1);
	map<string, int>::iterator it = Game::levelEventNameMap.find(eventType);
	if (it == Game::levelEventNameMap.end()) return 0;

	//Check compiled script
	map<int, int>::iterator script = game->compiledScripts.find(it->second);
	if (script == game->compiledScripts.end()) return 0;

	//Get event handler
	lua_rawgeti(state, LUA_REGISTRYINDEX, script->second);
	return 1;
	}

	//It will return old event handler.
	int setEventHandler(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string);
	HELPER_CHECK_ARGS_TYPE_OR_NIL(2, function);

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Check event type
	string eventType = lua_tostring(state, 1);
	map<string, int>::const_iterator it = Game::levelEventNameMap.find(eventType);
	if (it == Game::levelEventNameMap.end()){
	lua_pushfstring(state, "Unknown level event type: '%s'.", eventType.c_str());
	return lua_error(state);
	}

	//Check compiled script
	int scriptIndex = LUA_REFNIL;
	{
	map<int, int>::iterator script = game->compiledScripts.find(it->second);
	if (script != game->compiledScripts.end()) scriptIndex = script->second;
	}

	//Set new event handler
	game->compiledScripts[it->second] = luaL_ref(state, LUA_REGISTRYINDEX);

	if (scriptIndex == LUA_REFNIL) return 0;

	//Get old event handler and unreference it
	lua_rawgeti(state, LUA_REGISTRYINDEX, scriptIndex);
	luaL_unref(state, LUA_REGISTRYINDEX, scriptIndex);
	return 1;
	}

	int win(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Check if the currentState is the game state.
	if (stateID == STATE_LEVEL_EDITOR)
	return 0;
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	game->won = true;
	return 0;
	}

	int getTime(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Returns level size.
	lua_pushinteger(state, game->time);
	return 1;
	}

	int getRecordings(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Returns level size.
	lua_pushinteger(state, game->recordings);
	return 1;
	}

	int broadcastObjectEvent(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS_RANGE(1, 4);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(2, string);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(3, string);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL_NO_HINT(4, userdata);

	//Check event type
	int eventType = 0;
	{
	string s = lua_tostring(state, 1);
	auto it = Game::gameObjectEventNameMap.find(s);
	if (it == Game::gameObjectEventNameMap.end()){
	lua_pushfstring(state, "Unknown block event type: '%s'.", s.c_str());
	return lua_error(state);
	} else {
	eventType = it->second;
	}
	}

	//Check object type
	int objType = -1;
	if (args >= 2 && lua_isstring(state, 2)) {
	string s = lua_tostring(state, 2);
	auto it = Game::blockNameMap.find(s);
	if (it == Game::blockNameMap.end()){
	lua_pushfstring(state, "Unknown object type: '%s'.", s.c_str());
	return lua_error(state);
	} else {
	objType = it->second;
	}
	}

	//Check id
	const char* id = NULL;
	if (args >= 3 && lua_isstring(state, 3)) {
	id = lua_tostring(state, 3);
	}

	//Check target
	Block *target = NULL;
	if (args >= 4) {
	target = Block::getObjectFromUserData(state, 4);
	}

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	game->broadcastObjectEvent(eventType, objType, id, target);

	return 0;
	}

	}

	#define _L level
	//Array with the methods for the level library.
	static const struct luaL_Reg levellib_m[]={
	_FG(Size),
	_FG(Width),
	_FG(Height),
	_FG(Name),
	_FGS(EventHandler),
	_F(win),
	_FG(Time),
	_FG(Recordings),
	_F(broadcastObjectEvent),
	{NULL,NULL}
	};
	#undef _L

	int luaopen_level(lua_State* state){
	luaL_newlib(state,levellib_m);

	//Register the functions and methods.
	luaL_setfuncs(state,levellib_m,0);
	return 1;
	}

	/////////////////////////CAMERA SPECIFIC///////////////////////////

	//FIXME: I can't define namespace camera since there is already a global variable named camera.
	//Therefore I use struct camera for a workaround.

	struct camera {

	static int setMode(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string);

	string mode = lua_tostring(state, 1);

	//Get the game for setting the camera.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;
	//Check which mode.
	if (mode == "player"){
	game->cameraMode = Game::CAMERA_PLAYER;
	} else if (mode == "shadow"){
	game->cameraMode = Game::CAMERA_SHADOW;
	} else{
	//Unknown OR invalid camera mode.
	return luaL_error(state, "Unknown or invalid camera mode for %s: '%s'.", __FUNCTION__, mode.c_str());
	}

	//Returns nothing.
	return 0;
	}

	static int lookAt(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, integer);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	//Get the point.
	int x = lua_tointeger(state, 1);
	int y = lua_tointeger(state, 2);

	//Get the game for setting the camera.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;
	game->cameraMode = Game::CAMERA_CUSTOM;
	game->cameraTarget.x = x;
	game->cameraTarget.y = y;

	return 0;
	}

	};

	#define _L camera
	//Array with the methods for the camera library.
	static const struct luaL_Reg cameralib_m[]={
	_FS(Mode),
	_F(lookAt),
	{NULL,NULL}
	};
	#undef _L

	int luaopen_camera(lua_State* state){
	luaL_newlib(state,cameralib_m);

	//Register the functions and methods.
	luaL_setfuncs(state,cameralib_m,0);
	return 1;
	}

	/////////////////////////AUDIO SPECIFIC///////////////////////////

	namespace audio {

	int playSound(lua_State* state){
	//Get the number of args, this can be anything from one to three.
	HELPER_GET_AND_CHECK_ARGS_RANGE(1, 4);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE(2, integer);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE(3, boolean);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE(4, integer);

	//Default values for concurrent and force.
	//See SoundManager.h
	int concurrent = -1;
	bool force = false;
	int fadeMusic = -1;

	//If there's a second one it should be an integer.
	if (args > 1){
	concurrent = lua_tointeger(state, 2);
	}
	//If there's a third one it should be a boolean.
	if (args > 2){
	force = lua_toboolean(state, 3);
	}

	if (args > 3){
	fadeMusic = lua_tointeger(state, 4);
	}

	//Get the name of the sound.
	string sound = lua_tostring(state, 1);
	//Try to play the sound.
	int channel = getSoundManager()->playSound(sound, concurrent, force, fadeMusic);

	//Returns whether the operation is successful.
	lua_pushboolean(state, channel >= 0 ? 1 : 0);
	return 1;
	}

	int playMusic(lua_State* state){
	//Get the number of args, this can be either one or two.
	HELPER_GET_AND_CHECK_ARGS_2(1, 2);

	//Make sure the first argument is a string.
	HELPER_CHECK_ARGS_TYPE(1, string);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE(2, boolean);

	//Default value of fade for playMusic.
	//See MusicManager.h.
	bool fade = true;

	//If there's a second one it should be a boolean.
	if (args > 1){
	fade = lua_toboolean(state, 2);
	}

	//Get the name of the music.
	string music = lua_tostring(state, 1);
	//Try to switch to the new music.
	getMusicManager()->playMusic(music, fade);

	//Returns nothing.
	return 0;
	}

	int pickMusic(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Let the music manager pick a song from the current music list.
	getMusicManager()->pickMusic();
	return 0;
	}

	int setMusicList(lua_State* state){
	//Get the number of args, this MUST be one.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Make sure the given argument is a string.
	HELPER_CHECK_ARGS_TYPE(1, string);

	//And set the music list in the music manager.
	string list = lua_tostring(state, 1);
	getMusicManager()->setMusicList(list);
	return 0;
	}

	int getMusicList(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Return the name of the song (contains list prefix).
	lua_pushstring(state, getMusicManager()->getCurrentMusicList().c_str());
	return 1;
	}


	int currentMusic(lua_State* state){
	//NOTE: this function accepts 0 arguments, but we ignore the argument count.

	//Return the name of the song (contains list prefix).
	lua_pushstring(state, getMusicManager()->getCurrentMusic().c_str());
	return 1;
	}

	}

	#define _L audio
	//Array with the methods for the audio library.
	static const struct luaL_Reg audiolib_m[]={
	_F(playSound),
	_F(playMusic),
	_F(pickMusic),
	_FGS(MusicList),
	_F(currentMusic),
	{NULL,NULL}
	};
	#undef _L

	int luaopen_audio(lua_State* state){
	luaL_newlib(state,audiolib_m);

	//Register the functions and methods.
	luaL_setfuncs(state,audiolib_m,0);
	return 1;
	}

	/////////////////////////DELAY EXECUTION SPECIFIC///////////////////////////

	namespace delayExecution {

	HELPER_REGISTER_IS_VALID_FUNCTION(ScriptDelayExecution);

	int schedule(lua_State* state) {
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS_AT_LEAST(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE_OR_NIL(1, function);
	HELPER_CHECK_ARGS_TYPE(2, integer);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(3, integer);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(4, integer);
	HELPER_CHECK_OPTIONAL_ARGS_TYPE_OR_NIL(5, boolean);

	//Check if the currentState is the game state.
	Game* game = dynamic_cast<Game*>(currentState);
	if (game == NULL) return 0;

	//Create the delay execution object.
	ScriptDelayExecution *obj = new ScriptDelayExecution(game->getScriptExecutor()->getDelayExecutionList());
	obj->setActive();

	obj->time = (int)lua_tointeger(state, 2);
	obj->repeatCount = (args >= 3 && lua_isnumber(state, 3)) ? (int)lua_tointeger(state, 3) : 1;
	obj->repeatInterval = (args >= 4 && lua_isnumber(state, 4)) ? (int)lua_tointeger(state, 4) : obj->time;
	obj->enabled = ((args >= 5 && lua_isboolean(state, 5)) ? lua_toboolean(state, 5) : 1) != 0;

	//Get arguments.
	for (int i = 6; i <= args; i++) {
	obj->arguments.push_back(luaL_ref(state, LUA_REGISTRYINDEX));
	}
	std::reverse(obj->arguments.begin(), obj->arguments.end());

	//Get the function.
	lua_settop(state, 1);
	obj->func = luaL_ref(state, LUA_REGISTRYINDEX);

	//Create the userdatum.
	obj->createUserData(state, "delayExecution");

	//We return one object, the userdatum.
	return 1;
	}

	int cancel(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Delete the object.
	delete object;
	return 0;
	}

	int isEnabled(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	lua_pushboolean(state, object->enabled ? 1 : 0);
	return 1;
	}

	int setEnabled(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, boolean);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	object->enabled = lua_toboolean(state, 2) != 0;
	return 0;
	}

	int getTime(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	lua_pushinteger(state, object->time);
	return 1;
	}

	int setTime(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	object->time = (int)lua_tointeger(state, 2);
	return 0;
	}

	int getRepeatCount(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	lua_pushinteger(state, object->repeatCount);
	return 1;
	}

	int setRepeatCount(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	object->repeatCount = (int)lua_tointeger(state, 2);
	return 0;
	}

	int getRepeatInterval(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	lua_pushinteger(state, object->repeatInterval);
	return 1;
	}

	int setRepeatInterval(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Set the repeat interval (should >=1).
	int i = (int)lua_tointeger(state, 2);
	if (i > 0) object->repeatInterval = i;
	return 0;
	}

	int getFunc(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;
	if (object->func == LUA_REFNIL) return 0;

	lua_rawgeti(state, LUA_REGISTRYINDEX, object->func);
	return 1;
	}

	int setFunc(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE_OR_NIL(2, function);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	int oldFunc = object->func;
	object->func = luaL_ref(state, LUA_REGISTRYINDEX);

	if (oldFunc == LUA_REFNIL) return 0;

	lua_rawgeti(state, LUA_REGISTRYINDEX, oldFunc);
	luaL_unref(state, LUA_REGISTRYINDEX, oldFunc);
	return 1;
	}

	int getArguments(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	for (int a : object->arguments) {
	lua_rawgeti(state, LUA_REGISTRYINDEX, a);
	}

	return object->arguments.size();
	}

	int setArguments(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS_AT_LEAST(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	//Remove old arguments.
	for (int a : object->arguments) {
	luaL_unref(state, LUA_REGISTRYINDEX, a);
	}
	object->arguments.clear();

	//Get arguments.
	for (int i = 2; i <= args; i++) {
	object->arguments.push_back(luaL_ref(state, LUA_REGISTRYINDEX));
	}
	std::reverse(object->arguments.begin(), object->arguments.end());

	return 0;
	}

	int getExecutionTime(lua_State* state){
	HELPER_GET_AND_CHECK_ARGS(1);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	lua_pushinteger(state, object->executionTime);
	return 1;
	}

	int setExecutionTime(lua_State* state) {
	HELPER_GET_AND_CHECK_ARGS(2);

	HELPER_CHECK_ARGS_TYPE_NO_HINT(1, userdata);
	HELPER_CHECK_ARGS_TYPE(2, integer);

	auto object = ScriptDelayExecution::getObjectFromUserData(state, 1);
	if (object == NULL) return 0;

	object->executionTime = (int)lua_tointeger(state, 2);
	return 0;
	}
	}


	#define _L delayExecution
	//Array with the methods for the block library.
	static const struct luaL_Reg delayExecutionLib_m[] = {
	_FI(Valid),
	_F(schedule),
	_F(cancel),
	_FIS(Enabled),
	_FGS(Time),
	_FGS(RepeatCount),
	_FGS(RepeatInterval),
	_FGS(Func),
	_FGS(Arguments),
	_FGS(ExecutionTime),
	{ NULL, NULL }
	};
	#undef _L

	int luaopen_delayExecution(lua_State* state){
	luaL_newlib(state, delayExecutionLib_m);

	//Create the metatable for the delay execution userdata.
	luaL_newmetatable(state, "delayExecution");

	lua_pushstring(state, "__index");
	lua_pushvalue(state, -2);
	lua_settable(state, -3);

	ScriptDelayExecution::registerMetatableFunctions(state, -3);

	//Register the functions and methods.
	luaL_setfuncs(state, delayExecutionLib_m, 0);
	return 1;
	}

	/////////////////////////GETTEXT SPECIFIC///////////////////////////

	namespace gettext {

	int gettext(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(1);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string); //msgid

	if (levels) {
	auto dm = levels->getDictionaryManager();
	if (dm) {
	lua_pushstring(state, dm->get_dictionary().translate(lua_tostring(state, 1)).c_str());
	return 1;
	}
	}

	//If we failed to find dictionay manager, we just return the original string.
	lua_pushvalue(state, 1);
	return 1;
	}

	int pgettext(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(2);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string); //msgctxt
	HELPER_CHECK_ARGS_TYPE(2, string); //msgid

	if (levels) {
	auto dm = levels->getDictionaryManager();
	if (dm) {
	lua_pushstring(state, dm->get_dictionary().translate_ctxt(lua_tostring(state, 1), lua_tostring(state, 2)).c_str());
	return 1;
	}
	}

	//If we failed to find dictionay manager, we just return the original string.
	lua_pushvalue(state, 2);
	return 1;
	}

	int ngettext(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(3);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string); //msgid
	HELPER_CHECK_ARGS_TYPE(2, string); //msgid_plural
	HELPER_CHECK_ARGS_TYPE(3, integer);

	if (levels) {
	auto dm = levels->getDictionaryManager();
	if (dm) {
	lua_pushstring(state, dm->get_dictionary().translate_plural(
	lua_tostring(state, 1),
	lua_tostring(state, 2),
	lua_tointeger(state, 3)
	).c_str());
	return 1;
	}
	}

	//If we failed to find dictionay manager, we just return the original string.
	if (lua_tointeger(state, 3) == 1) {
	lua_pushvalue(state, 1);
	} else {
	lua_pushvalue(state, 2);
	}
	return 1;
	}

	int npgettext(lua_State* state){
	//Check the number of arguments.
	HELPER_GET_AND_CHECK_ARGS(4);

	//Check if the arguments are of the right type.
	HELPER_CHECK_ARGS_TYPE(1, string); //msgctxt
	HELPER_CHECK_ARGS_TYPE(2, string); //msgid
	HELPER_CHECK_ARGS_TYPE(3, string); //msgid_plural
	HELPER_CHECK_ARGS_TYPE(4, integer);

	if (levels) {
	auto dm = levels->getDictionaryManager();
	if (dm) {
	lua_pushstring(state, dm->get_dictionary().translate_ctxt_plural(
	lua_tostring(state, 1),
	lua_tostring(state, 2),
	lua_tostring(state, 3),
	lua_tointeger(state, 4)
	).c_str());
	return 1;
	}
	}

	//If we failed to find dictionay manager, we just return the original string.
	if (lua_tointeger(state, 4) == 1) {
	lua_pushvalue(state, 2);
	} else {
	lua_pushvalue(state, 3);
	}
	return 1;
	}

	}

	#define _L gettext
	static const struct luaL_Reg gettextlib_m[] = {
	_F(gettext),
	_F(pgettext),
	_F(ngettext),
	_F(npgettext),
	{ NULL, NULL }
	};
	#undef _L

	int luaopen_gettext(lua_State* state){
	//Register the global shortcut function _() and __().
	luaL_loadstring(state,
	"function _(s)\n"
	" return gettext.gettext(s)\n"
	"end\n"
	"function __(s)\n"
	" return s\n"
	"end\n"
	);
	lua_pcall(state, 0, 0, 0);

	luaL_newlib(state, gettextlib_m);

	//Register the functions and methods.
	luaL_setfuncs(state, gettextlib_m, 0);
	return 1;
	}

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