use std::ops::{Add, AddAssign, Mul, Neg, Sub, SubAssign};

#[derive(Debug)]
pub struct Vec2<Value>
{
    pub x: Value,
    pub y: Value,
}

impl Vec2<u32>
{
    pub const ZERO: Self = Self { x: 0, y: 0 };
}

#[derive(Debug, Default, Clone)]
#[repr(C)]
pub struct Vec3<Value>
{
    pub x: Value,
    pub y: Value,
    pub z: Value,
}

impl Vec3<f32>
{
    pub const UP: Self = Self { x: 0.0, y: 1.0, z: 0.0 };

    /// Returns the length of the vector.
    #[must_use]
    pub fn length(&self) -> f32
    {
        (self.x.powi(2) + self.y.powi(2) + self.z.powi(2)).sqrt()
    }

    /// Normalizes the vector, returning a unit vector.
    #[must_use]
    pub fn normalize(&self) -> Self
    {
        let length = self.length();

        Self {
            x: self.x / length,
            y: self.y / length,
            z: self.z / length,
        }
    }

    /// Returns the cross product of this and another vector.
    #[must_use]
    pub fn cross(&self, rhs: &Self) -> Self
    {
        Self {
            x: (self.y * rhs.z) - (self.z * rhs.y),
            y: (self.z * rhs.x) - (self.x * rhs.z),
            z: (self.x * rhs.y) - (self.y * rhs.x),
        }
    }

    /// Returns the dot product of this and another vector.
    #[must_use]
    pub fn dot(&self, rhs: &Self) -> f32
    {
        (self.x * rhs.x) + (self.y * rhs.y) + (self.z * rhs.z)
    }
}

impl<Value> Sub for Vec3<Value>
where
    Value: Sub<Value, Output = Value>,
{
    type Output = Self;

    fn sub(self, rhs: Self) -> Self::Output
    {
        Self::Output {
            x: self.x - rhs.x,
            y: self.y - rhs.y,
            z: self.z - rhs.z,
        }
    }
}

impl<Value> Sub for &Vec3<Value>
where
    for<'a, 'b> &'a Value: Sub<&'b Value, Output = Value>,
{
    type Output = Vec3<Value>;

    fn sub(self, rhs: Self) -> Self::Output
    {
        Self::Output {
            x: &self.x - &rhs.x,
            y: &self.y - &rhs.y,
            z: &self.z - &rhs.z,
        }
    }
}

impl<Value> Add for Vec3<Value>
where
    Value: Add<Value, Output = Value>,
{
    type Output = Self;

    fn add(self, rhs: Self) -> Self::Output
    {
        Self::Output {
            x: self.x + rhs.x,
            y: self.y + rhs.y,
            z: self.z + rhs.z,
        }
    }
}

impl<Value> Add for &Vec3<Value>
where
    for<'a, 'b> &'a Value: Add<&'b Value, Output = Value>,
{
    type Output = Vec3<Value>;

    fn add(self, rhs: Self) -> Self::Output
    {
        Self::Output {
            x: &self.x + &rhs.x,
            y: &self.y + &rhs.y,
            z: &self.z + &rhs.z,
        }
    }
}

impl<Value> Neg for Vec3<Value>
where
    Value: Neg<Output = Value>,
{
    type Output = Self;

    fn neg(mut self) -> Self::Output
    {
        self.x = -self.x;
        self.y = -self.y;
        self.z = -self.z;

        self
    }
}

impl<Value> Add<Value> for Vec3<Value>
where
    Value: Add<Value, Output = Value> + Clone,
{
    type Output = Self;

    fn add(mut self, rhs: Value) -> Self::Output
    {
        self.x = self.x + rhs.clone();
        self.y = self.y + rhs.clone();
        self.z = self.z + rhs.clone();

        self
    }
}

impl<Value> Sub<Value> for Vec3<Value>
where
    Value: Sub<Value, Output = Value> + Clone,
{
    type Output = Self;

    fn sub(mut self, rhs: Value) -> Self::Output
    {
        self.x = self.x - rhs.clone();
        self.y = self.y - rhs.clone();
        self.z = self.z - rhs.clone();

        self
    }
}

impl<Value> Mul<Value> for Vec3<Value>
where
    Value: Mul<Value, Output = Value> + Clone,
{
    type Output = Self;

    fn mul(mut self, rhs: Value) -> Self::Output
    {
        self.x = self.x * rhs.clone();
        self.y = self.y * rhs.clone();
        self.z = self.z * rhs.clone();

        self
    }
}

impl<Value> AddAssign for Vec3<Value>
where
    Value: AddAssign<Value>,
{
    fn add_assign(&mut self, rhs: Self)
    {
        self.x += rhs.x;
        self.y += rhs.y;
        self.z += rhs.z;
    }
}

impl<Value> SubAssign for Vec3<Value>
where
    Value: SubAssign<Value>,
{
    fn sub_assign(&mut self, rhs: Self)
    {
        self.x -= rhs.x;
        self.y -= rhs.y;
        self.z -= rhs.z;
    }
}