For ip use get_user_ip(...).
For steamid use get_user_authid(...).
For currentmap use get_mapname(...).
For nextmap get the value of amx_nextmap CVAR.
For timeleft use get_timeleft().
For country use geoip_country(...) from the geoip module.
Or you can tell when exactly you want to show that message and I'll make it.