#include "stream.h"

#include <stdlib.h>

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

/// Creates and pushes new Stream into the Lua stack.
/// \param L Lua state to push to
/// \param fd File descriptor used by the Stream
/// \return TODO
int stream_push_new(lua_State * L, const int fd)
{
	struct stream * s = lua_newuserdata(L, sizeof(struct stream));
	s->fd = fd;

	if (1 == luaL_newmetatable(L, "stream"))
	{
		lua_pushstring(L, "__gc");
		lua_pushcfunction(L, stream_gc);
		lua_rawset(L, -3);
	}

	lua_setmetatable(L, -2);

	return LUA_OK;
}

/// Metamethod to handle garbage collection of Stream userdata.
/// \param L Lua state in which Stream resides
/// \return Always zero, which is the number of the results pushed to the stack
int stream_gc(lua_State * L)
{
	struct stream * s = lua_touserdata(L, -1);

	if (NULL != s)
	{
		if (NULL != s->in.data)
		{
			free(s->in.data);
		}
	}

	return 0;
}