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use crate::{Options, OptionsCache, OptionsFactory, OptionsMonitorCache, OptionsSnapshot, Ref};

/// Represents an object that manages options and option snapshots.
pub struct OptionsManager<T> {
    factory: Ref<dyn OptionsFactory<T>>,
    cache: OptionsCache<T>,
}

impl<T> OptionsManager<T> {
    /// Initializes a new options manager.
    ///
    /// # Arguments
    ///
    /// * `factory` - The [factory](trait.OptionsFactory.html) used to create new options.
    pub fn new(factory: Ref<dyn OptionsFactory<T>>) -> Self {
        Self {
            factory,
            cache: Default::default(),
        }
    }
}

impl<T> Options<T> for OptionsManager<T> {
    fn value(&self) -> &T {
        self.get(None)
    }
}

impl<T> OptionsSnapshot<T> for OptionsManager<T> {
    fn get(&self, name: Option<&str>) -> &T {
        self.cache.get_or_add(name, &|n| self.factory.create(n).unwrap())
    }
}