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use std::marker::PhantomData;
use na::Real;
use bounding_volume::BoundingVolume;
use partitioning::BVTVisitor;

/// Bounding Volume Tree visitor collecting interferences with a given bounding volume.
pub struct BoundingVolumeInterferencesCollector<'a, N: 'a + Real, B: 'a, BV: 'a> {
    bv: &'a BV,
    collector: &'a mut Vec<B>,
    _scalar: PhantomData<N>,
}

impl<'a, N, B, BV> BoundingVolumeInterferencesCollector<'a, N, B, BV>
where
    N: Real,
    BV: BoundingVolume<N>,
{
    /// Creates a new `BoundingVolumeInterferencesCollector`.
    #[inline]
    pub fn new(
        bv: &'a BV,
        buffer: &'a mut Vec<B>,
    ) -> BoundingVolumeInterferencesCollector<'a, N, B, BV> {
        BoundingVolumeInterferencesCollector {
            bv: bv,
            collector: buffer,
            _scalar: PhantomData,
        }
    }
}

impl<'a, N, B, BV> BVTVisitor<B, BV> for BoundingVolumeInterferencesCollector<'a, N, B, BV>
where
    N: Real,
    B: Clone,
    BV: BoundingVolume<N>,
{
    #[inline]
    fn visit_internal(&mut self, bv: &BV) -> bool {
        bv.intersects(self.bv)
    }

    #[inline]
    fn visit_leaf(&mut self, b: &B, bv: &BV) {
        if (self.bv as *const BV) != (bv as *const BV) && bv.intersects(self.bv) {
            self.collector.push(b.clone())
        }
    }
}