And no, I did not move, delete, or even touch the Minecraft folder manually recently. I am able to play Minecraft literally 10 minutes ago, and then I closed Minecraft, and when I open Minecraft again, I realised that all my worlds, resource packs, server saves, etc. are wiped clean. I can't even see Minecraft app. The Minecraft folder is totally messed up. I did not see my files inside Trash.
What happened? Why did this happen, and how can I recover my files?
[EDIT] Minecraft.app is not there. Why did this happen?