You can do that, with varying results. Or you can just do actual software engineering like we used to do, and tell it what patterns to abstract and how.

You choose your level of effort and involvement. The LLM can write whatever you tell it to write. If you send a drawing of an app and say "make this" then you'll get whatever it comes up with. If you tell it how to make it then it will make it the way you tell it to.

If your AI code is trash that's because you're trash at directing it.