use crate::*;

/// Collection of UI modes.
#[derive(Default, Debug, Clone)]
pub struct Modes(
    Arc<RwLock<BTreeMap<Arc<str>, Arc<Mode<Arc<str>>>>>>
);

impl Modes {
    pub fn add (&self, name: &impl AsRef<str>, body: &impl Language) -> Usually<()> {
        let mut mode = Mode::default();
        body.each(|item|mode.add(item))?;
        self.0.write().unwrap().insert(name.as_ref().into(), Arc::new(mode));
        Ok(())
    }
    pub fn get (&self, name: impl AsRef<str>) -> Option<Arc<Mode<Arc<str>>>> {
        self.0.read().unwrap().get(name.as_ref()).cloned()
    }
    pub fn for_each <T> (&self, mut ator: impl FnMut(&str, &Mode<Arc<str>>)->T) {
        for (k, v) in self.0.read().unwrap().iter() {
            let _ = ator(k.as_ref(), v.as_ref());
        }
    }
    pub fn len (&self) -> usize {
        self.0.read().unwrap().len()
    }
}