so I got into an accident a few weeks back...thought my bike fairs pretty well, but im thinking my fork my be bent alitlte bit...bike pulls hard to the left when riding without hands...

so first...is there a way to fix a bent fork...or is it better to just replace?? if thats the case...what are some things i need to know in buying a new fork...I ride a mercier 57cm frame...its got the stock mercier fork on it right now...can I used a threaded OR threadless fork...how can I tell which I have....(assuming I need to remove the fork to tell)

any insight would be greatly appreciated!