Nahum

I am a little confused.

This is a recording of Nahum’s vision. He tells, in detail, how horrible Nineveh is (no wonder Jonah didn’t want to go) and of it’s upcoming destruction. Is this before or after God gave Nineveh a second chance? If before, shouldn’t it have been placed before the book of Jonah in the Bible? If after, does it mean God gave them a second chance and they messed up again?

See, confusing. 

I may need to check with someone who who has actually studied the Bible and has more insight than a novice like me.