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use super::*;

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct SceneItem {
    start: f64,
    z: i64,
    animated: Box<dyn Animated>,
}

#[derive(Clone, Debug, Serialize, Deserialize)]
pub struct Scene {
    items: Vec<SceneItem>,
    duration: f64,
    size: Size,
}

impl Scene {
    pub fn new() -> Self {
        Scene {
            items: Vec::new(),
            duration: 0f64,
            size: Size::default(),
        }
    }

    pub fn add(&mut self, animated: Box<dyn Animated>, start: f64, z: i64) {
        let size = animated.size();
        let end = start + animated.duration();
        self.items.push(SceneItem { animated, start, z });

        self.size.x = self.size.x.max(size.x);
        self.size.y = self.size.y.max(size.y);

        self.duration = self.duration.max(end);
    }

    pub fn register(engine: &mut rhai::Engine) {
        use rhai::RegisterFn;
        engine.register_type::<Scene>();
        engine.register_fn("scene", Scene::new);
        engine.register_fn("add", Scene::add);
        engine.register_fn("as_animated", Scene::as_animated);
    }
}

#[typetag::serde(name = "scene")]
impl Animated for Scene {
    fn draw(&self, context: &cairo::Context, offset: f64) {
        let mut items: Vec<&SceneItem> = self.items
            .iter()
            .filter(|i| i.start <= offset && (i.start + i.animated.duration()) > offset)
            .collect();
        items.sort_by_key(|i| i.z);

        for item in items {
            item.animated.draw(context, offset - item.start);
        }
    }

    fn size(&self) -> Size {
        self.size
    }

    fn duration(&self) -> f64 {
        self.duration
    }

    fn audio(&self) -> Box<dyn Iterator<Item = AudioItem>> {
        let audios: Vec<Box<dyn Iterator<Item = AudioItem>>> = self.items.iter().map(|i| i.animated.audio()).collect();
        Box::new(audios.into_iter().flatten())
    }
}