1997 Nissan Altima engine problem

Oil light came on while driving. Stop checked oil, oil was not low. Tried to drive home when oil light came on again. Car started to make tapping noise. Had car towed home. Had bearings replaced and oil pump. Still making tapping noise while engine is running and noticed smoke from the engine and oil light still comes on after engine runs for few min. What could be the problem. Thanks, Brenda