It can probably be fixed. There is a tool that is/was available where a bar goes into the headtube and a threaded rod pushes agains the bottom brakcet shell to push the head tube back to it's home position. THe frame has been damaged and will never again have the same straght as when it was new, but it will likely be ok to ride.

If the fork is not bent (put it on its back on a flat table and see if it is at all arched such that the crown is lifted off the table. If it is bent, toss it and get a replacement. If it is not bent, ride it.

Disclaimer: Check very closely for cracks in both the frame and fork. Riding a damaged (or undamaged) bike can cause injury or death in any number of ways. Take you life in your own hands. I would ride that bike after repair, but that doesn't mean you should.