use crate::core::*;

pub type KeyHandler<T> = &'static dyn Fn(&mut T)->Usually<bool>;

pub type KeyBinding<T> = (
    KeyCode, KeyModifiers, &'static str, &'static str, KeyHandler<T>
);

pub type KeyMap<T> = [KeyBinding<T>];

pub fn handle_keymap <T> (
    state: &mut T, event: &AppEvent, keymap: &KeyMap<T>,
) -> Usually<bool> {
    match event {
        AppEvent::Input(Event::Key(event)) => {
            for (code, modifiers, _, _, command) in keymap.iter() {
                if *code == event.code && modifiers.bits() == event.modifiers.bits() {
                    return command(state)
                }
            }
        },
        _ => {}
    };
    Ok(false)
}

#[macro_export] macro_rules! key {
    ($k:ident $(($char:literal))?, $m:ident, $n: literal, $d: literal, $f: expr) => {
        (KeyCode::$k $(($char))?, KeyModifiers::$m, $n, $d, &$f)
    };
}

#[macro_export] macro_rules! keymap {
    ($T:ty { $([$k:ident $(($char:literal))?, $m:ident, $n: literal, $d: literal, $f: expr]),* $(,)? }) => {
        &[
            $((KeyCode::$k $(($char))?, KeyModifiers::$m, $n, $d, &$f as KeyHandler<$T>)),*
        ] as &'static [KeyBinding<$T>]
    }
}