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use crate::{NearlyEqual, Vector};

/// A point in 3D space.
#[derive(Copy, Clone, Debug, PartialEq, zerocopy::AsBytes, zerocopy::FromBytes)]
#[repr(C)]
pub struct Point {
    pub x: f32,
    pub y: f32,
    pub z: f32,
}

impl Point {
    /// Create a new point from x, y, z coordinates
    pub fn new(x: f32, y: f32, z: f32) -> Self {
        Self { x, y, z }
    }

    /// The additive identity
    pub fn zero() -> Self {
        Self {
            x: 0.0,
            y: 0.0,
            z: 0.0,
        }
    }

    /// The multiplicative identity
    pub fn one() -> Self {
        Self {
            x: 1.0,
            y: 1.0,
            z: 1.0,
        }
    }
}

impl From<Vector> for Point {
    /// Convert a vector into a point
    fn from(v: Vector) -> Self {
        Point {
            x: v.x,
            y: v.y,
            z: v.z,
        }
    }
}

impl NearlyEqual for &Point {
    fn nearly_equals(self, rhs: Self) -> bool {
        self.x.nearly_equals(rhs.x) && self.y.nearly_equals(rhs.y) && self.z.nearly_equals(rhs.z)
    }
}