1989 Mercedes Benz 190e Transmission/clutch

The clutch on my 190e 2.6 goes immediately to the floor when you push on it with your foot and stays there. It won't return back to its normal position unless you manually bring it back. Also the clutch won't disengage. It's stuck engaged. The car does drive, I had to drive 3 miles from when it went, back to my house. But I couldn't use any clutch. Had to shift by matching revs and starting out with 1st gear engaged. Could it be air in the hydraulic lines or is it needing slave cylinder, master cylinder or release bearing. Or a whole new clutch in general.

Thanks,

Gavin