Drop Shipping/Supplier Interface

The module is suppose to allow suppliers to login to an administration page to manage products that they supply. They are limited to products they supply and have no access to other products from other suppliers. I will also need to let our suppliers add products to categories he is allowed to add products to. I probably also need this feature to be enabled or disbled which will limit them to only modify existing products in the database. Other future plans would be sales report viewing where the reports will limited to their products, viewing orders of their products, downloading a summary of these orders (csv files),
automatic email sending when a customer ordered one of their product, etc