Add data into incomplete products that have missing attributes

We require a script or automation of some kind that will do the following: cross check all products to make sure they are correct - cross check website products with products on google to make sure they are correct - fill in the data into any products that have missing attributes such as title, make, model, ean, upc, image, description, - assign any products that are not assigned to categories I can provide third party websites which can be used to fetch the data required that is not a problem. Our website is an OpenCart based website with currently over 26k products.