Possible direction and nature of the friction may be

If $u > \omega r$, f is kinetic and towards left. 

If $u < \omega r$, f is kinetic and towards right

If $u = \omega r$, pure rolling. In this f is static but can be in left or right direction. This can be easily understood by breaking pure rolling motion into pure translational and pure rotational motion.

In both cases$f$acts opposite to the direction of velocity of point of contact which can be in either left or right by combining both of them