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#![cfg_attr(docsrs, feature(doc_cfg))]
#![doc = include_str!("../README.md")]

use melodium_core::common::executive::{Output, ResultStatus};
use melodium_macro::{mel_model, mel_package};

/// Provides interactions with Mélodium engine.
///
/// `ready` source is triggered at startup when engine is ready to process.
#[mel_model(
    source ready () (trigger Block<void>)
    continuous (continuous)
)]
#[derive(Debug)]
pub struct Engine {
    model: std::sync::Weak<EngineModel>,
}

impl Engine {
    fn new(model: std::sync::Weak<EngineModel>) -> Self {
        Self { model }
    }

    async fn continuous(&self) {
        let model = self.model.upgrade().unwrap();

        model
            .new_ready(
                None,
                Some(Box::new(|mut outputs| {
                    let trigger = outputs.remove("trigger").unwrap();

                    vec![Box::new(Box::pin(Self::ready(trigger)))]
                })),
            )
            .await;
    }

    async fn ready(trigger: Box<dyn Output>) -> ResultStatus {
        let _ = trigger.send_one_void(()).await;
        trigger.close().await;
        ResultStatus::Ok
    }
}

mel_package!();