https://micaelnussbaumer.com/posts/creating-card-draft-bot-elixir/#before-bot-draft

Here I go through how and why would one use a gen_statem OTP abstraction to model an actual bot draft - using a very similar but slightly simplified version of the one that runs in my game https://aethersummon.com for some types of drafts - the game itself is still in BETA and in continuous development but playable. The whole code is in a single .exs file that you can run locally installing only some dependencies for handling types and schemas in a cleaner way.