Function to detect xbmc version

Hi all,

Sorry for the noob question but I've been googling it and couldn't find any relevant info about it. What is the default function to detect the xbmc version. For instance:

If version == "eden" --> something
if version == "frodo" --> something


It would also be great to know how to detect the platform like atv1, atv2, iOs, etc.

Thanks in advance