Hi Joe, hi stuh.
If I knew that stuh here, I would / should / could / might / have written a difficult one

( perfect conditional ).
See, I'm learning.
If we take this form,
could+might+perfect infinitive.This would imply that the speaker is indignant ( that was what I read ).
so,
You could / might have told me !
imlpies that the speaker is indignant somehow.
But, I also read that the same form above with perfect infinitive indicates an unused ability, or past ability.
So, is this right for the same sentence above ?