Rule to convert string arguments to enum case

[gisostallenberg]

I have this idea to create a rule that collects all arguments passed to a certain function and creates an enum to represent that value.

Example
Before:

class Foo {
    public function doSomething(string $what): void
    {
        // ...
    }
}
(new Foo())->doSomething('some-string');
(new Foo())->doSomething('some-other-string');
(new Foo())->doSomething('some-other-string'); // again

After:

enum What: string
{
    case SOME_STRING = 'some-string';
    case SOME_OTHER_STRING = 'some-other-string';
}

class Foo {
    public function doSomething(What $what): void
    {
        // ...
    }
}
(new Foo())->doSomething(What::SOME_STRING);
(new Foo())->doSomething(What::SOME_OTHER_STRING);
(new Foo())->doSomething(What::SOME_OTHER_STRING); // again

Or alternatively leave the argument type string, and get the value of the enum, as in:

(new Foo())->doSomething(What::SOME_STRING->value);

The rule of course needs configuration:

    $rectorConfig->ruleWithConfiguration(StringArgumentsToEnumRector::class, [
        new StringArgumentsToEnum(class: Foo::class, method: 'doSomething', argumentName: 'what', targetEnum: What::class),
    ]);

I have no idea where to start with such a rule, or if this is already possible with other rules.

[gisostallenberg]

I think this can be done using ReplaceArgumentDefaultValue if the enum already exists. The point is that I want to expand the enum.