use bevy_asset::{AsAssetId, Asset, AssetId, Handle};
use bevy_ecs::{component::Component, entity::Entity, prelude::ReflectComponent};
use bevy_math::Mat4;
use bevy_reflect::prelude::*;
use core::ops::Deref;

#[derive(Component, Debug, Default, Clone, Reflect)]
#[reflect(Component, Default, Debug, Clone)]
pub struct SkinnedMesh {
    pub inverse_bindposes: Handle<SkinnedMeshInverseBindposes>,
    #[entities]
    pub joints: Vec<Entity>,
}

impl AsAssetId for SkinnedMesh {
    type Asset = SkinnedMeshInverseBindposes;

    // We implement this so that `AssetChanged` will work to pick up any changes
    // to `SkinnedMeshInverseBindposes`.
    fn as_asset_id(&self) -> AssetId<Self::Asset> {
        self.inverse_bindposes.id()
    }
}

#[derive(Asset, TypePath, Debug)]
pub struct SkinnedMeshInverseBindposes(Box<[Mat4]>);

impl From<Vec<Mat4>> for SkinnedMeshInverseBindposes {
    fn from(value: Vec<Mat4>) -> Self {
        Self(value.into_boxed_slice())
    }
}

impl Deref for SkinnedMeshInverseBindposes {
    type Target = [Mat4];
    fn deref(&self) -> &Self::Target {
        &self.0
    }
}