War between Pakistan and India?

In the case of war between Pakistan and India witch is not highly likely but is very possible what do you think would happen? This is just a hypothetical question so don't freak out and be a little ***** about it but who would get involved..? Who would come out victor..? What side would the major powers side with..? Would china get involved and on whose side..? Would the US/NATO get involved and on whose side..? Could the war possibly spill into Afghanistan forcing the US to be involved..? Is any iranian involvement possible..? Any thought on the topic are appreciated I'm just curious to see what people think could pan out in that situation. :D