2000 Hyundai Tiburon Loose break disk

My front driver wheel makes a noise when the car moves that gets a lot worse when I break. You can also feel vibration in the break pedal.
I unmounted the wheel and noticed that the break disk is loose (no screws holding it in place) which may or may not be a problem since the wheel itself would keep it in place.
When I rotate the disk with my hand I notice that it is not regular and that's probably what produces the noise. It goes from no friction to almost impossible to move and back to no friction as I rotate it.

Would this be a simple as replacing the rotors/disks, the caliper or could there be other problems as well?

Thanks,
Gustavo