The "Why" of Creation -- Does the bible explain God's reasoning?

This question is more theoretical than anything, but I wanted to ask the following: If God is a perfect being, one can safely infer that he has no needs, because of the nature of his existence is already 100% fulfilled. One can also infer, under the same preconception, that he should have no real wants. A true want for something more would mean that you are, at least in your own perception, incomplete. With this in mind, one can assume that God had no real reason to create humanity. I have heard the argument that God "wanted" to create humanity, in the same manner that human parents "want" to have kids. But if God is perfect, with no needs and no reason to want more, than this argument doesn't hold a lot of weight. So, does the bible explain the "why" of God creating humanity? I wouldn't expect to have a direct answer, but does it at least give us clues as to God's reasoning?