Reporting Facility in K2.NET

Hi to all

I need to generate reports from the workflow i am building customer complain system , following are the main requirments

GUI based reporting module where selection of parameter of report is possible
Predefined reports
No of complaints ( in a period ) and graph for same

No of complaint Status wise ( in a period ) Graph for same
No of complaint Severity wise ( in a period ) Graph for same

Department wise complaint ( in a period ) Graph for same
Status wise
Severity wise
Source wise report ( in period ) Graph for same
Delivery Channel wise report ( In a period ) Graph for same
Product Wise report ( In a period ) Graph for same

Now can anyone please tell me is there any way in k2.net to do this or i had to do core coding.