/*
  Copyright (C) 2010 Matt King, Birunthan Mohanathas

  This program 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 2
  of the License, or (at your option) any later version.

  This program 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 this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
*/

#ifndef __LUAMANAGER_H__
#define __LUAMANAGER_H__

extern "C"
{
#include "lua.h"
#include "lualib.h"
#include "lauxlib.h"
}

#include <vector>

class LuaManager
{
public:
	class ScopedLuaState
	{
	public:
		ScopedLuaState(bool unicode) { LuaManager::c_UnicodeStateStack.push_back(unicode); }
		~ScopedLuaState() { LuaManager::c_UnicodeStateStack.pop_back(); }
		operator lua_State*() { return LuaManager::c_State; }
	};

	static void Initialize();
	static void Finalize();

	static ScopedLuaState GetState(bool unicode) { return ScopedLuaState(unicode); }

	static bool IsUnicodeState() { return c_UnicodeStateStack.back(); }

	static void ReportErrors(const std::wstring& file);

	static void PushWide(const WCHAR* str);
	static void PushWide(const std::wstring& str);
	static std::wstring ToWide(int narg);

protected:
	static int c_RefCount;
	static lua_State* c_State;

private:
	static void RegisterGlobal(lua_State* L);
	static void RegisterMeasure(lua_State* L);
	static void RegisterMeter(lua_State* L);
	static void RegisterMeterWindow(lua_State* L);
	static void RegisterMeterString(lua_State* L);

	// If the back of the vector is |true|, Lua strings converted to/from as if they were encoded
	// in UTF-8. Otherwise Lua strings are treated as if they are encoded in the default system
	// encoding.
	static std::vector<bool> c_UnicodeStateStack;
};

#endif