get_class_name

[eluser]CroNiX[/eluser]

Code:

$this->router->fetch_method();
$this->router->fetch_class();
$this->router->fetch_directory();

may also be useful. It might not work correctly though since you are using CI in ways the user guide states you shouldn't (multiple class definitions in single file).

Personally, I'd look into libraries for a lot of what you're doing.