#pragma once
#include "lua/lua.h"
#include "lua/lualib.h"
#include "lua/lauxlib.h"
#include <string>

class LuaVM
{
public:
	LuaVM() {
		_L = luaL_newstate();
		luaL_openlibs(_L);
		_managed = true;
	}
	LuaVM(lua_State* L, bool managed=false) {
		_L = L;
		_managed = managed;
	}

	/// NonMoveable,NonCopyable
	LuaVM(const LuaVM&) = delete;
	LuaVM& operator = (const LuaVM&) = delete;
	LuaVM(LuaVM&&) = delete;
	LuaVM& operator = (LuaVM&&) = delete;
	~LuaVM() {
		if (_managed) {
			lua_close(_L);
		}
	}
	
	operator lua_State* () {
		return _L;
	}
private:
	lua_State* _L;
	bool _managed;
};


template<typename T>
T& getuserdata(lua_State* L, int index)  // LUA_TUSERDATA
{
	return *(T*)luaL_checkudata(L, index, T::tname);
}

template<typename T>
T getvalue(lua_State* L, int index);

template<typename T>
T& pushvalue(lua_State* L)
{
	return *(T*)lua_newuserdata(L, sizeof(T));
}

void pushvalue(lua_State* L, int val);

void pushvalue(lua_State* L, double val);

void pushvalue(lua_State* L, const char* str);

void pushvalue(lua_State* L, const char* str, int len);

void pushvalue(lua_State* L, const std::string& str);

void pushvalue(lua_State* L, lua_CFunction fn);

void pushvalue(lua_State* L, lua_CFunction fn, int nup);