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use crate::bounding_volume::AABB;
use crate::math::Isometry;
use na::RealField;
use crate::partitioning::{BestFirstVisitStatus, BestFirstVisitor, BVH};
use crate::query::{Ray, RayCast, RayIntersection};
use crate::shape::Compound;

// XXX: if solid == false, this might return internal intersection.
impl<N: RealField> 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 visitor = CompoundRayToiVisitor {
            compound: self,
            ray: &ls_ray,
            solid: solid,
        };

        self.bvt().best_first_search(&mut visitor).map(|res| res.1)
    }

    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 visitor = CompoundRayToiAndNormalVisitor {
            compound: self,
            ray: &ls_ray,
            solid: solid,
        };

        self.bvt().best_first_search(&mut visitor).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 CompoundRayToiVisitor<'a, N: 'a + RealField> {
    compound: &'a Compound<N>,
    ray: &'a Ray<N>,
    solid: bool,
}

impl<'a, N: RealField> BestFirstVisitor<N, usize, AABB<N>> for CompoundRayToiVisitor<'a, N> {
    type Result = N;

    #[inline]
    fn visit(&mut self, best: N, aabb: &AABB<N>, data: Option<&usize>) -> BestFirstVisitStatus<N, Self::Result> {
        if let Some(toi) = aabb.toi_with_ray(&Isometry::identity(), self.ray, true) {
            let mut res = BestFirstVisitStatus::Continue { cost: toi, result: None };

            if let Some(b) = data {
                if toi < best {
                    let elt = &self.compound.shapes()[*b];
                    match elt.1.toi_with_ray(&elt.0, self.ray, self.solid) {
                        Some(toi) => res = BestFirstVisitStatus::Continue { cost: toi, result: Some(toi) },
                        None => {},
                    }
                }
            }

            res
        } else {
            BestFirstVisitStatus::Stop
        }
    }
}

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

impl<'a, N: RealField> BestFirstVisitor<N, usize, AABB<N>> for CompoundRayToiAndNormalVisitor<'a, N> {
    type Result = RayIntersection<N>;

    #[inline]
    fn visit(&mut self, best: N, aabb: &AABB<N>, data: Option<&usize>) -> BestFirstVisitStatus<N, Self::Result> {
        if let Some(toi) = aabb.toi_with_ray(&Isometry::identity(), self.ray, true) {
            let mut res = BestFirstVisitStatus::Continue { cost: toi, result: None };

            if let Some(b) = data {
                if toi < best {
                    let elt = &self.compound.shapes()[*b];
                    match elt.1.toi_and_normal_with_ray(&elt.0, self.ray, self.solid) {
                        Some(toi) => res = BestFirstVisitStatus::Continue { cost: toi.toi, result: Some(toi) },
                        None => {},
                    }
                }
            }

            res
        } else {
            BestFirstVisitStatus::Stop
        }
    }
}