What is bent is the corner of the display assembly, and Apple's in-store remedy will be to replace the entire display assembly for many hundreds of dollars. It may be that the machine could be repaired for substantially less if the store sends it to an Apple "repair depot". Ask about that at the store. If you do either of those things, your warranty (and AppleCare if you bought it) will be reinstated after the repair; if you don't, they will be gone for good.
You could buy a replacement display assembly or a replacement display back panel and install it yourself, but a) your warranty would then be void, and b) neither replacement procedure is easy. These are not snap-in parts.
Homeowner's or renter's insurance or accidental-damage coverage under your credit card agreement might cover part of the repair cost. Look into these possibilities.