which sentence is correct in the given 2 sentences.

1 . I would have bought new books if I had some money

2 . I would buy new books if I had some money .

plz tell the answer fast. Quickest and best answer will be marked as brainliest and I will follow you as well . ​ also I want to know the reason they are correct and they are different tenses . I think 1st one is correct but correct me if I am wrong. but give reasons. ​