well i got to work and was a little early so decided id wait till it was time to clock in, when i got out of the car i saw a huge puddle of oil!!! all the oil that was in the engine came pouring out. i have no clue what this might be. first thing that popped into my head was the oil pump since the oil seems to be gushing out from the crankshaft pulley. im not to sure if thats what it is or what so i was wondering if anyone here ever had this happen to them ,and what was their solution to the problem. can it be a gasket? how much will it cost to get a new oil pump installed? how hard is it to change if i do it myself?
im kinda in a rush right now so i didnt have time to do a search
thanks guys

EDIT: i know its not the oil pan gasket, not the head valve cover gasket, not the oil pan drain plug.