Car won't start, oil leaking

What is your question?

My Volvo has been driving fine, but suddenly seemed to have a dead battery yesterday, after being in a restaurant for a few hours. We jumped the battery with no problems, but by the time we had driven home, about 10 miles, smoke was pouring out of the engine. It appears that oil has spewed all over the engine, but we cannot determine where the leak is. The car will not start again. As it is New Years day, I have been unable to contact my usual repair people, and was wondering if anyone had any ideas about what's happening here. Thank you.