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use crate::bounding_volume::SimdAABB;
use crate::math::{Point, Real, SimdReal, SIMD_WIDTH};
use crate::partitioning::{SimdVisitStatus, SimdVisitor};
use crate::shape::SimdCompositeShape;
use crate::utils::IsometryOpt;
use simba::simd::{SimdBool as _, SimdValue};

/// Visitor for checking if a composite shape contains a specific point.
pub struct CompositePointContainmentTest<'a, S: 'a> {
    /// The composite shape on which the point containment test should be performed.
    pub shape: &'a S,
    /// The point to be tested.
    pub point: &'a Point<Real>,
    /// A traversal will set this to `true` if the point is inside of `self.shape`.
    pub found: bool,
}

impl<'a, S> CompositePointContainmentTest<'a, S> {
    /// Creates a new visitor for the testing containment of the given `point`
    /// into the given `shape`.
    pub fn new(shape: &'a S, point: &'a Point<Real>) -> Self {
        Self {
            shape,
            point,
            found: false,
        }
    }
}

impl<'a, S: SimdCompositeShape> SimdVisitor<u32, SimdAABB>
    for CompositePointContainmentTest<'a, S>
{
    #[inline]
    fn visit(&mut self, bv: &SimdAABB, b: Option<[Option<&u32>; SIMD_WIDTH]>) -> SimdVisitStatus {
        let simd_point: Point<SimdReal> = Point::splat(*self.point);
        let mask = bv.contains_local_point(&simd_point);

        if let Some(data) = b {
            let bitmask = mask.bitmask();

            for ii in 0..SIMD_WIDTH {
                if (bitmask & (1 << ii)) != 0 && data[ii].is_some() {
                    self.shape
                        .map_part_at(*data[ii].unwrap(), &mut |part_pos, obj| {
                            if obj
                                .contains_local_point(&part_pos.inverse_transform_point(self.point))
                            {
                                self.found = true;
                            }
                        });

                    if self.found {
                        return SimdVisitStatus::ExitEarly;
                    }
                }
            }
        }

        SimdVisitStatus::MaybeContinue(mask)
    }
}