LinuxQuestions.org - advanced squid configuration

Hello members.I have the following requirement,so can any one tell me if possible with squid or not.

i want to setup a squid proxy with, user authentication and billing.so that i can charge my clients for there internet connection.I want to know how much time they have surfed the internet.i want setup a value also.i mean i want to setup a value telling that 1 hour internet browsing is 1$.So that i can charge them directly with out calculating their time.

In microsoft Environment i have tried the Internet Caffe software of Antamedia.This software has all the features i have mentioned.But i want to move in linux.The above thing should meet with wired and wireless Network environment too.It should have Idle time out features,login,logout Tabs.Accounting for prepaid and postpaid users too.

IS IT POSSIBLE!!!!!!!!!?

Any suggestions Are Welcome And Appreciated.

Thanks in Advance.