Water entering when it rains

Hi guys hoping you can help, I recently purchased a 2002 mazda protege 5 door. When I bought it I noticed the floors were soaking wet, the guy (my buddy from work) said his parents left the windows open for a few weeks as I noticed mold growing on the seats and center console.I bought his story and for 500 bucks what the hell I bought it, as soon as I got home I took out all the seats and console and removed the carpet to find a nice level of water in the car so I shop-vac it up and dryed it completely. I took the carpet down in my basement and left it to dry. That night it rained the next morning I came out to check on the car and there was small puddles on both sides of the front of the floor pans (this seems to stop where the first crossmember is just under the front seats as the rear floor is bone dry. Anyone have any ideas where the water is coming from? It doesn't seem to be rusted around the front window pillars unless it is hiding under the weather striping. Please help!