use crate::*;

impl Scene {
    pub fn from_edn <'a, 'e> (args: &[Edn<'e>]) -> Usually<Self> {
        let mut name  = None;
        let mut clips = vec![];
        edn!(edn in args {
            Edn::Map(map) => {
                let key = map.get(&Edn::Key(":name"));
                if let Some(Edn::Str(n)) = key {
                    name = Some(*n);
                } else {
                    panic!("unexpected key in scene '{name:?}': {key:?}")
                }
            },
            Edn::Symbol("_") => {
                clips.push(None);
            },
            Edn::Int(i) => {
                clips.push(Some(*i as usize));
            },
            _ => panic!("unexpected in scene '{name:?}': {edn:?}")
        });
        let scene = Self::new(name.unwrap_or(""), clips);
        Ok(scene)
    }
}