Need Template help

Hey there, I've been trying to figure this out for a while but haven't yet been able to.

What I'm needing is a send-to-device template to sort a fiction and non-fiction library. Ideally, something like:

if fiction: fiction/author_sort/title - authors
if non-fiction: non-fiction/subject/title - authors

I'm just using tags for this, where the first tag is fiction or non-fiction, and the second is used only for non-fiction, and that's the subject matter. So tags for a fiction book is just "fiction". And tags for a non-fiction might be "non-fiction, world history".

If anyone can provide some help or insight, that'd be much appreciated!