use na::{Point3, Vector3, Vector4};
use num::Zero;

#[test]
fn point_clone() {
    let p = Point3::new(1.0, 2.0, 3.0);
    let p2 = p.clone();
    assert_eq!(p, p2);
}

#[test]
fn point_ops() {
    let a = Point3::new(1.0, 2.0, 3.0);
    let b = Point3::new(1.0, 2.0, 3.0);
    let c = Vector3::new(1.0, 2.0, 3.0);

    assert_eq!(a - b, Vector3::zero());
    assert_eq!(&a - &b, Vector3::zero());
    assert_eq!(a - &b, Vector3::zero());
    assert_eq!(&a - b, Vector3::zero());

    assert_eq!(b - c, Point3::origin());
    assert_eq!(&b - &c, Point3::origin());
    assert_eq!(b - &c, Point3::origin());
    assert_eq!(&b - c, Point3::origin());

    assert_eq!(b + c, 2.0 * a);
    assert_eq!(&b + &c, 2.0 * a);
    assert_eq!(b + &c, 2.0 * a);
    assert_eq!(&b + c, 2.0 * a);

    let mut a1 = a;
    let mut a2 = a;
    let mut a3 = a;
    let mut a4 = a;

    a1 -= c;
    a2 -= &c;
    a3 += c;
    a4 += &c;

    assert_eq!(a1, Point3::origin());
    assert_eq!(a2, Point3::origin());
    assert_eq!(a3, 2.0 * a);
    assert_eq!(a4, 2.0 * a);
}

#[test]
fn point_coordinates() {
    let mut pt = Point3::origin();

    assert_eq!(pt.x, 0);
    assert_eq!(pt.y, 0);
    assert_eq!(pt.z, 0);

    pt.x = 1;
    pt.y = 2;
    pt.z = 3;

    assert_eq!(pt.x, 1);
    assert_eq!(pt.y, 2);
    assert_eq!(pt.z, 3);
}

#[test]
fn point_scale() {
    let pt = Point3::new(1, 2, 3);
    let expected = Point3::new(10, 20, 30);

    assert_eq!(pt * 10, expected);
    assert_eq!(&pt * 10, expected);
    assert_eq!(10 * pt, expected);
    assert_eq!(10 * &pt, expected);
}

#[test]
fn point_vector_sum() {
    let pt = Point3::new(1, 2, 3);
    let vec = Vector3::new(10, 20, 30);
    let expected = Point3::new(11, 22, 33);

    assert_eq!(&pt + &vec, expected);
    assert_eq!(pt + &vec, expected);
    assert_eq!(&pt + vec, expected);
    assert_eq!(pt + vec, expected);
}

#[test]
fn to_homogeneous() {
    let a = Point3::new(1.0, 2.0, 3.0);
    let expected = Vector4::new(1.0, 2.0, 3.0, 1.0);

    assert_eq!(a.to_homogeneous(), expected);
}

#[test]
fn point_ops_without_assign() {
    // Ensure adding matrices works without implementing AddAssign
    #[derive(Clone, Copy, Debug, PartialEq)]
    struct Value(f32);
    impl std::ops::Add<&Value> for Value {
        type Output = Self;
        fn add(self, rhs: &Self) -> Self {
            Value(self.0 + rhs.0)
        }
    }
    impl std::ops::Add<Value> for Value {
        type Output = Self;
        fn add(self, rhs: Self) -> Self {
            self.add(&rhs)
        }
    }
    impl std::ops::Sub<&Value> for Value {
        type Output = Self;
        fn sub(self, rhs: &Self) -> Self {
            Value(self.0 - rhs.0)
        }
    }
    impl std::ops::Sub<Value> for Value {
        type Output = Self;
        fn sub(self, rhs: Self) -> Self {
            self.sub(&rhs)
        }
    }
    impl std::ops::Mul<Value> for f32 {
        type Output = Value;
        fn mul(self, rhs: Value) -> Self::Output {
            Value(self * rhs.0)
        }
    }
    impl std::ops::Mul<f32> for Value {
        type Output = Value;
        fn mul(self, rhs: f32) -> Self::Output {
            Value(self.0 * rhs)
        }
    }
    impl Zero for Value {
        fn zero() -> Self {
            Value(Zero::zero())
        }

        fn is_zero(&self) -> bool {
            self.0.is_zero()
        }
    }

    let a = Point3::new(
        Value(1.0),
        Value(2.0),
        Value(3.0),
    );
    let b = Point3::new(
        Value(1.0),
        Value(2.0),
        Value(3.0),
    );
    let c = Vector3::new(
        Value(1.0),
        Value(2.0),
        Value(3.0),
    );

    assert_eq!(a - b, Vector3::zero());
    assert_eq!(&a - &b, Vector3::zero());
    assert_eq!(a - &b, Vector3::zero());
    assert_eq!(&a - b, Vector3::zero());

    assert_eq!(b - c, Point3::origin());
    assert_eq!(&b - &c, Point3::origin());
    assert_eq!(b - &c, Point3::origin());
    assert_eq!(&b - c, Point3::origin());

    let a2 = Point3::new(
        Value(2.0),
        Value(4.0),
        Value(6.0),
    );
    assert_eq!(b + c, a2);
    assert_eq!(&b + &c, a2);
    assert_eq!(b + &c, a2);
    assert_eq!(&b + c, a2);
}

#[cfg(feature = "arbitrary")]
quickcheck!(
    fn point_sub(pt1: Point3<f64>, pt2: Point3<f64>) -> bool {
        let dpt = &pt2 - &pt1;
        relative_eq!(pt2, pt1 + dpt, epsilon = 1.0e-7)
    }
);