Your rationalization from the verse is obvious. And because there was no light before He gave the command, Let there be Light, there was nothing but darkness, which either was always there, or there wasnt even darkness, which He would have created. And wherever the light shines with something blocking the light, darkness is created, so He definately created that darkness. As for good times and bad, of course He does that, but creating bad times is simply allowing evil to have its way. He could strike us down, send rain or drought, based on His reaction on the consensus of how it would affect ppl spiritually which is more important than the physical.
Glad that I am so easily able to amuse you. You must have been easy to amuse as a child.