Specialty calculators

Anyone know of a calculator that you can input macros you need, maybe at the end of the day, or anytime that will tell you good foods? ie. At the end of the day I have 500 calories left, but need 15g Protein, 10% calcium, and 5% vitamin C. Is there anything out there that allows to enter that info and gives food with close to that content?

I don't imagine it would be too hard to implement with the proper databases, and I would be surprised if there isn't anything like this out there alread.