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use std::ops::Add;
use std::ops::AddAssign;
use std::ops::Sub;
use std::ops::Neg;

use num_traits::{Float, ToPrimitive};

#[derive(Clone, Copy, Debug, PartialEq)]
pub struct Point<T: Float> {
    pub x: T,
    pub y: T,
}

impl<T> Point<T> where T: Float + ToPrimitive {
    pub fn new(x: T, y: T) -> Point<T> {
        Point {x: x, y: y}
    }
}

impl<T> Add for Point<T> where T: Float + ToPrimitive {
    type Output = Point<T>;
    fn add(self, rhs: Point<T>) -> Point<T> {
        Point::new(self.x + rhs.x, self.y + rhs.y)
    }
}

impl<T> Sub for Point<T> where T: Float + ToPrimitive{
    type Output = Point<T>;
    fn sub(self, rhs: Point<T>) -> Point<T> {
        Point::new(self.x - rhs.x, self.y - rhs.y)
    }
}

impl<T> AddAssign for Point<T> where T: Float + ToPrimitive {
    fn add_assign(&mut self, rhs: Point<T>) {
        self.x = self.x + rhs.x;
        self.y = self.y + rhs.y;
    }
}

impl<T> Neg for Point<T> where T: Float + ToPrimitive {
    type Output = Point<T>;
    fn neg(self) -> Point<T> {
        Point::new(-self.x, -self.y)
    }
}

#[cfg(test)]
mod test {
    use ::point::Point;
    #[test]
    fn point_test() {
        let p1 = Point::new(12.0, 33.3);
        let p2 = Point{x: 12.0, y: 33.3};
        assert_eq!(p1, p2);
        assert_eq!(p1.x, p2.x);
        assert_eq!(p1.y, p2.y);
    }

}