You got up late and you missed the train. ⇒ I wish I _______ late.
hadn't got up = I wish + subject + past perfect to talk about the past.
You shouted at your girlfriend and she broke up with you. ⇒ I wish I _____ at my girlfriend.
hadn't shouted = I wish + subject + past perfect to talk about the past.
You're not the boss so you can't use the car park. ⇒ I wish I _____the boss.
was|were = I wish + subject + past simple to talk about the present or future