Help please. How would you say "to catch someone doing something" as in the phrase

"I came a thousand miles just to catch you while you're smiling."?

Tháinig mé míle míle chun feiceáil tú gan a fhios agat nuair a bhíonn aoibh gháire ort.

https://www.teanglann.ie/en/eid/catch :


Rug mé ort ag ól. = I caught you drinking.

So:
Tháinig mé ag breith (or: chun, le breith; a bhreith) ort ag déanamh miongháire = I came to catch you smiling.

Thank you. I'm thinking that "to catch someone doing something" may have two nuances. One is to catch someone in that act of doing something bad (like drinking) and the other is to happen to see someone doing something interesting or pleasant which is why I tried to translate it as saying she had no knowledge of me seeing her smiling. Do you think there's a difference in Irish?