Friend/enemy macro help needed :)

[Smoothtalkin]

Sorry if this is the wrong area (first post here) but im wondering if anyone can help me with writing a macro.
Basically im looking for a macro that will cast a certain spell if my target is friendly and a different spell if the target is hostile, e.g earth shock and healingwave

I have tried
/cast [harm] [target=player] earth shock(rank 8)
/cast [help] [target=player] healing wave (rank 12)

but it does'nt seem to work >.<
any help on this would be fantastic

Also a macro that uses both trinkets on different cooldown

-Smooth