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use crossbeam_channel::Receiver;

use crate::{Error, Evaluator, Model, ModelEvent, Watcher};

/// A Fornjot model host
pub struct Host {
    evaluator: Evaluator,
    _watcher: Watcher,
}

impl Host {
    /// Create a new instance of `Host`
    ///
    /// This is only useful, if you want to continuously watch the model for
    /// changes. If you don't, just keep using `Model`.
    pub fn from_model(model: Model) -> Result<Self, Error> {
        let watch_path = model.watch_path();
        let evaluator = Evaluator::from_model(model);
        let watcher = Watcher::watch_model(&watch_path, &evaluator)?;

        Ok(Self {
            evaluator,
            _watcher: watcher,
        })
    }

    /// Access a channel with evaluation events
    pub fn events(&self) -> Receiver<ModelEvent> {
        self.evaluator.events()
    }
}