Ducuments needed when we are invited by an individual in china

Dear Sir
I am a Tunisian citizen i ve received an invitation from a friend working in Shanghai since 2007 and i just wanted to know what are the required documents to apply for a visa and which type fits my case he will take care of my accommodation there and all the costs of the trip
Whould you please tell me what should i present to the Chinese Consulate in Tunisia ?
Thank you so much sir ☺