use crate::*;
use std::marker::PhantomData;

pub trait EdnControlData<E: Input> {}

/// Renders from EDN source and context.
#[derive(Default)]
pub enum EdnControls<E: Input, T: EdnControlData<E>> {
    #[default]
    Inert,
    _Unused(PhantomData<E>),
    Ok(T, EdnItem<String>),
    Err(String)
}

impl<E: Input, T: EdnControlData<E>> EdnControls<E, T> {
    pub fn from_source (state: T, source: &str) -> Self {
        match EdnItem::read_one(&source) {
            Ok((layout, _)) => Self::Ok(state, layout),
            Err(error) => Self::Err(format!("{error}"))
        }
    }
    pub fn from_items (state: T, items: &[EdnItem<&str>]) -> Self {
        Self::Ok(state, EdnItem::Exp(items.iter().map(|i|(*i).clone()).collect()))
    }
}

pub trait EdnCommand<C>: Command<C> {
    fn from_edn <'a> (state: &C, head: &EdnItem<&str>, tail: &'a [EdnItem<String>]) -> Self;
}