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use na::Real;
use bounding_volume::AABB;
use shape::Compound;
use partitioning::BVTCostFn;
use query::{Ray, RayCast, RayIntersection};
use math::Isometry;

// XXX: if solid == false, this might return internal intersection.
impl<N: Real> RayCast<N> for Compound<N> {
    fn toi_with_ray(&self, m: &Isometry<N>, ray: &Ray<N>, solid: bool) -> Option<N> {
        let ls_ray = ray.inverse_transform_by(m);

        let mut cost_fn = CompoundRayToiCostFn {
            compound: self,
            ray: &ls_ray,
            solid: solid,
        };

        self.bvt()
            .best_first_search(&mut cost_fn)
            .map(|(_, res)| res)
    }

    fn toi_and_normal_with_ray(
        &self,
        m: &Isometry<N>,
        ray: &Ray<N>,
        solid: bool,
    ) -> Option<RayIntersection<N>> {
        let ls_ray = ray.inverse_transform_by(m);

        let mut cost_fn = CompoundRayToiAndNormalCostFn {
            compound: self,
            ray: &ls_ray,
            solid: solid,
        };

        self.bvt()
            .best_first_search(&mut cost_fn)
            .map(|(_, mut res)| {
                res.normal = m * res.normal;
                res
            })
    }

    // XXX: We have to implement toi_and_normal_and_uv_with_ray! Otherwise, no uv will be computed
    // for any of the sub-shapes.
}

/*
 * Costs functions.
 */
struct CompoundRayToiCostFn<'a, N: 'a + Real> {
    compound: &'a Compound<N>,
    ray: &'a Ray<N>,
    solid: bool,
}

impl<'a, N: Real> BVTCostFn<N, usize, AABB<N>> for CompoundRayToiCostFn<'a, N> {
    type UserData = N;
    #[inline]
    fn compute_bv_cost(&mut self, aabb: &AABB<N>) -> Option<N> {
        aabb.toi_with_ray(&Isometry::identity(), self.ray, self.solid)
    }

    #[inline]
    fn compute_b_cost(&mut self, b: &usize) -> Option<(N, N)> {
        let elt = &self.compound.shapes()[*b];
        elt.1
            .toi_with_ray(&elt.0, self.ray, self.solid)
            .map(|toi| (toi, toi))
    }
}

struct CompoundRayToiAndNormalCostFn<'a, N: 'a + Real> {
    compound: &'a Compound<N>,
    ray: &'a Ray<N>,
    solid: bool,
}

impl<'a, N: Real> BVTCostFn<N, usize, AABB<N>>
    for CompoundRayToiAndNormalCostFn<'a, N> {
    type UserData = RayIntersection<N>;

    #[inline]
    fn compute_bv_cost(&mut self, aabb: &AABB<N>) -> Option<N> {
        aabb.toi_with_ray(&Isometry::identity(), self.ray, self.solid)
    }

    #[inline]
    fn compute_b_cost(&mut self, b: &usize) -> Option<(N, RayIntersection<N>)> {
        let elt = &self.compound.shapes()[*b];
        elt.1
            .toi_and_normal_with_ray(&elt.0, self.ray, self.solid)
            .map(|inter| (inter.toi, inter))
    }
}