Ally / Enemy Keybindings

[19logan91]

I was wondering if there was an addon or maybe just some way i don't know about that allows you to use the same key binding but it changes what it's used for for different targets.

For example i'll be playing my priest and want to cast smite on an enemy, so i press "1" and it casts smite. But when i target an ally and i press "1" it casts heal rather than smite because the ally is targeted rather than the enemy.

Is this a doable thing? it would be massively convenient. Currently my setup is alt1-5 for my main harmful spells but i'd rather be able to use the alt key for an easier layout out for helpful spells AND harmful.

Thanks for your help
-Logan