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This code reminds me of why ML-like languages with Maybe-style types and case expressions that generate compiler errors for missed alternatives are good. I bet rewriting this in OCaml or Haskell would lead to tighter code and might even unearth a couple possible states that haven't been accounted for.

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You don't really need functional languages to have those features, as swift, kotlin and others show.

Swift basically is functional

Those languages have all of the ML features; they are functional languages in every reasonable sense, unless you consider "functional" to mean the absence of something.

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