Does a parked car with fogged windows and movement constitutes reasonable suspicion fourth amendment

Myself and two friends parked outside 24hr public gas station. Driver makes purchase, returns to vehicle. Officer arrives at station to purchase drink, then watches our vehicle for ten minutes while speaking to a customer. Car is running and rear and side windows are fogged due to weather (same as all cars parked). After ten minutes of observation officer sees me moving in rear driver side for 1-2 seconds and approaches the vehicle on foot with a flashlight and knocks on the driver's window. Asks about commotion in back before claiming he smells marijuana, passenger affirms this. Told to shut off vehicle, two more police vehices block ours into parking spot and three more officers surround vehicle and search us individually finding small amount of weed. The officer claims that his reason for the stop was that he suspected an assault based on movement and fogged windows. Was he in the right to make the stop, the evidence for reasonable cause seems very weak will this hold up in court.