Visa headache!

Hello, I will shortly be travelling to Abu Dhabi on a 30 days visit visa, before it runs out I want to travel to Fuzhou for 1 week to visit my girlfriend, and while I am there we want to go for a few days in hong kong, then back to Fuzhou for a few days before I travel back to abu dhabi. Which type should I apply? Can I get the necessary type for my china visit while I am in abu dhabi? if so how long will it take to process and will the embassy need to keep my passport during the processing period?
Thanks
Brett