#include <lua.h>
#include <lauxlib.h>
#include <glib.h>

#include "glib_types.h"
#include "util.h"

void lglib_callback_destroy (lglib_callback_t *cb)
{
	luaL_unref (cb->L, LUA_REGISTRYINDEX, cb->reference);
	luaL_free (cb->L, cb);
}

#define LGLIB_CHECK(WHAT, TYPE)                                               \
lglib_##WHAT##_t *luaL_checklglib_##WHAT (lua_State *L, int index)            \
{                                                                             \
	lglib_##WHAT##_t *object = luaL_checkudata (L, index, "glib." #WHAT); \
	luaL_argcheck (L, object != NULL, index, "glib " #WHAT " expected");  \
	return object;                                                        \
}

#define LGLIB_BLESS(WHAT, TYPE)                                                   \
lglib_##WHAT##_t *lglib_##WHAT##_bless (lua_State *L, TYPE *WHAT)                 \
{                                                                                 \
	lglib_##WHAT##_t *object;                              /* top of stack */ \
	lua_pushstring (L, LGLIB_OBJREGISTRY);       /* 1 registry table name  */ \
	lua_rawget (L, LUA_REGISTRYINDEX);                 /* 1 registry table */ \
	lua_pushlightuserdata (L, WHAT);                   /* 2 light userdata */ \
	lua_rawget (L, -2);                                    /* 2 object/nil */ \
	if (!lua_isnil (L, -1)) {                                  /* 2 object */ \
		lua_remove (L, -2);                                /* 1 object */ \
		object = lua_touserdata (L, -1);                                  \
		return object;                                                    \
	}                                                                         \
	                                                              /* 2 nil */ \
	lua_remove (L, -1);                                /* 1 registry table */ \
	object = lua_newuserdata (L, sizeof (lglib_##WHAT##_t)); /* 2 userdata */ \
	luaL_getmetatable (L, "glib." #WHAT);                   /* 3 metatable */ \
	lua_setmetatable (L, -2);                                  /* 2 object */ \
	lua_pushlightuserdata (L, WHAT);                   /* 3 light userdata */ \
	lua_pushvalue (L, -2);                                     /* 4 object */ \
	lua_rawset (L, -4);                                        /* 2 object */ \
	lua_remove (L, -2);                                        /* 1 object */ \
	object->WHAT = WHAT;                                                      \
	g_##WHAT##_ref (WHAT);                                                    \
	return object;                                                            \
}

#define LGLIB_DEFINE(WHAT, TYPE) \
LGLIB_CHECK (WHAT, TYPE)         \
LGLIB_BLESS (WHAT, TYPE)

LGLIB_DEFINE (main_context, GMainContext)
LGLIB_DEFINE (source, GSource)

#undef LGLIB_DEFINE