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 "Game.h"
	#include "MusicManager.h"
	#include <iostream>
	using namespace std;

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

	#define HELPER_GET_AND_CHECK_ARGS(ARGS) \
	int args = lua_gettop(state); \
	if(args != ARGS) { \
	lua_pushstring(state, "Incorrect number of arguments for " __FUNCTION__ ", expected " #ARGS "."); \
	lua_error(state); \
	}

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

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

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

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

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

	#define HELPER_CHECK_ARGS_TYPE(INDEX, TYPE) \
	if(!lua_is##TYPE(state,INDEX)) { \
	lua_pushstring(state,"Invalid type for argument " #INDEX " of " __FUNCTION__ ", should be " #TYPE "."); \
	lua_error(state); \
	}

	#define HELPER_CHECK_ARGS_TYPE_NO_HINT(INDEX, TYPE) \
	if(!lua_is##TYPE(state,INDEX)) { \
	lua_pushstring(state,"Invalid type for argument " #INDEX " of " __FUNCTION__ "."); \
	lua_error(state); \
	}

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

	#define HELPER_CHECK_ARGS_TYPE_2_NO_HINT(INDEX, TYPE1, TYPE2) \
	if(!lua_is##TYPE1(state,INDEX) && !lua_is##TYPE2(state,INDEX)) { \
	lua_pushstring(state,"Invalid type for argument " #INDEX " of " __FUNCTION__ "."); \
	lua_error(state); \
	}

	#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)) { \
	lua_pushstring(state,"Invalid type for argument " #INDEX " of " __FUNCTION__ ", should be " #TYPE "."); \
	lua_error(state); \
	}

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

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

	#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)) { \
	lua_pushstring(state,"Invalid type for argument " #INDEX " of " __FUNCTION__ "."); \
	lua_error(state); \
	}

	#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 _F(FUNC) \
	{ #FUNC, _L::FUNC }

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

	namespace 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, number); // integer
	HELPER_CHECK_ARGS_TYPE(3, number); // integer

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

	int x = lua_tonumber(state, 2);
	int y = lua_tonumber(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_pushnumber(state, object->getBox().x);
	lua_pushnumber(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, number); // integer
	HELPER_CHECK_ARGS_TYPE(3, number); // integer

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

	int x = lua_tonumber(state, 2);
	int y = lua_tonumber(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, number); // integer
	HELPER_CHECK_ARGS_TYPE(3, number); // integer

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

	int w = lua_tonumber(state, 2);
	int h = lua_tonumber(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_pushnumber(state, object->getBox().w);
	lua_pushnumber(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, number); // integer
	HELPER_CHECK_ARGS_TYPE(3, number); // integer

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

	int w = lua_tonumber(state, 2);
	int h = lua_tonumber(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;

	bool visible = lua_toboolean(state, 2);
	object->visible = visible;

	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, object->visible);
	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());
	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);

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

	}

	#define _L block
	//Array with the methods for the block library.
	static const struct luaL_Reg blocklib_m[]={
	_F(getBlockById),
	_F(getBlocksById),
	_F(moveTo),
	_F(getLocation),
	_F(setLocation),
	_F(growTo),
	_F(getSize),
	_F(setSize),
	_F(getType),
	_F(changeThemeState),
	_F(setVisible),
	_F(isVisible),
	_F(getEventHandler),
	_F(setEventHandler),
	{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///////////////////////////

	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_pushnumber(state, player->getBox().x);
	lua_pushnumber(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, number); // integer
	HELPER_CHECK_ARGS_TYPE(3, number); // integer

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

	//Get the new location.
	int x = lua_tonumber(state, 2);
	int y = lua_tonumber(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, number); // integer

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

	//Get the new location.
	if (args == 2){
	int yVel = lua_tonumber(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;
	}

	}

	#define _L playershadow
	//Array with the methods for the player and shadow library.
	static const struct luaL_Reg playerlib_m[]={
	_F(getLocation),
	_F(setLocation),
	_F(jump),
	_F(isShadow),
	_F(getCurrentStand),
	{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());
	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);

	//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;
	}

	}

	#define _L level
	//Array with the methods for the level library.
	static const struct luaL_Reg levellib_m[]={
	_F(getSize),
	_F(getWidth),
	_F(getHeight),
	_F(getName),
	_F(getEventHandler),
	_F(setEventHandler),
	_F(win),
	_F(getTime),
	_F(getRecordings),
	{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{
	//Unkown OR invalid camera mode.
	lua_pushfstring(state, "Unkown or invalid camera mode for " __FUNCTION__ ": '%s'.", mode.c_str());
	lua_error(state);
	}

	//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, number); // integer
	HELPER_CHECK_ARGS_TYPE(2, number); // integer

	//Get the point.
	int x = lua_tonumber(state, 1);
	int y = lua_tonumber(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[]={
	_F(setMode),
	_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, 3);

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

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

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

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

	//Returns nothing.
	return 0;
	}

	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),
	_F(setMusicList),
	_F(getMusicList),
	_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;
	}

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