Type of the Conditionals

I wish =If

If only=If

Examples: 

Miss Irene

2^nd (imaginary)

I wish+Past Simple

-I wish I bought a car.

-If only I bought a car.

If only+Past Simple

3^rd (regret,past,unreal)

I wish+Past Perfect

-I wish I had bought a car last year.

-If only I had bought a car last year. (But I didn't.)