Why would a car air conditioner stop blowing cold, what is the white smoke from the car?

I was driving along, and the air conditioner gradually got weaker, and then it made some sort of strange rattling noise when ever the AC was turned on, when i turned the ac off it mad a a click and the noise stopped. I had the Ac turned back on when all of a sudden there was a loud POP, and then a HISS. A white smoke came out of the front grill at a traffic light, and the ac stopped blowing cold.

The car worked fine for a little while, but then started making a horible squeeling sound and a funny burnt rubber smell (was that refrigerant leaking). Eventually the car suddenly became extremely hard to steer, and then as I lept on going the engine temperature started rapidly rising, , but I was almost home so I thought I would limp it.

Eventually the engine started running really rouch, and white smoke was billowing out the tailpipe. The engine lost a lot of horsepower and i had to floor it to keep up to speed limit. Then it just died and the car was shakking making some sort of boiling sound and venting srteam from the hood. What happened here, its a 2001 ford focus. Is it easily fixable, i had to push it that last block back home. What went wrong and how much might it cost to fix?
Added (1). Can you give me a breakdown of what might happened, what the strange smoke was and if the smell was refrigerant, it smelled like weird rubber. I dont know what refrigerant smells like, could i possibly be poisoned by the toxic gas? Why was the car shaking and making boiling sounds, and whatthe heck was the white smoke from the tailpipe? Was that trfrigerant, and was the loud hiss the refrigerant escaping? And whatn the heck was rattling?

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