Custom Magento Module for automatic product import

My Client have a webshop. They have some suppliers. Suppliers prodive them a daily CSV export of their catalouge. That CSV contains various informations. Not all the values are relevant to the webshop. The csv may be a weblink of a local file from user disk. Software will be able to show us the fields and we will be able to select which fields are relevant to us. Then products will be automatically imported and removed when no longer available. Imported products will have those selected attributes. For product information (description, specifications, image),? suppliers supply an ICEcat URL with each product. We need to gather info from ICEcat URL. url format is like <[login to view URL];mi=start;smi=product;shopname=openICEcat-url>? We need to have the products of our supplier imported into our Magento database automatically, on a daily basis. New products should be added, products that are no longer available removed and changed products should be updated. Furthermore, Product categories should also be in sync with those used by our supplier. Specifications and links to images should be fetched from ICEcat and added to the product in our Magento database. As these are subject to change, they also need to updated at least once a day (or hotlinked from ICEcat). Here we like to say that there will be more or less 40 suppliers. every suppliers have their own attributes. Some may coincide with others.