use super::Error;
use crate::{DecodeState, DecodedKey, HandleControl, KeyCode, KeyEvent, Modifiers};

pub trait ScancodeSet {
    /// Handles the state logic for the decoding of scan codes into key events.
    fn advance_state(&self, state: &mut DecodeState, code: u8) -> Result<Option<KeyEvent>, Error>;

    /// Convert a Scan Code set X byte to our 'KeyType' enum
    fn map_scancode(&self, code: u8) -> Result<KeyCode, Error>;

    /// Convert a Scan Code Set X extended byte (prefixed E0) to our `KeyType`
    /// enum.
    fn map_extended_scancode(&self, code: u8) -> Result<KeyCode, Error>;
}

pub trait KeyboardLayout {
    /// Convert a `KeyType` enum to a Unicode character, if possible.
    /// `KeyType::A` maps to `Some('a')` (or `Some('A')` if shifted), while
    /// `KeyType::AltLeft` returns `None`
    fn map_keycode(
        &self,
        keycode: KeyCode,
        modifiers: &Modifiers,
        handle_ctrl: HandleControl,
    ) -> DecodedKey;
}