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use na::*;
use num_traits::Float;
use alga::general::{SupersetOf,SubsetOf};
use std::mem;

/// Represents a rectangle with operations over it
#[derive(Clone,Copy,Debug,PartialEq,Hash)]
#[cfg_attr(feature = "serialize", derive(Serialize, Deserialize))]
pub struct Rect<T: BaseNum = f32>{
    pub pos: Pnt2<T>,
    pub width: T,
    pub height: T
}

/// Trait to calculate if something is inside a rectangle
pub trait InsideRect<T: BaseNum>{
    fn inside(&self, rect: &Rect<T>) -> bool;
}

impl<T:Float + BaseNum> InsideRect<T> for Pnt2<T>{
    fn inside(&self, rect: &Rect<T>) -> bool{
        self.x > rect.pos.x && self.y > rect.pos.y && self.x < rect.pos.x + rect.width && self.y < rect.pos.y + rect.height
    }
}

impl<T:Float + BaseNum> InsideRect<T> for Rect<T>{
    fn inside(&self, rect: &Rect<T>) -> bool{
        self.pos.x > rect.pos.x && self.pos.y > rect.pos.y &&
        self.pos.x + self.width < rect.pos.x + rect.width &&
        self.pos.y + self.height < rect.pos.y + rect.height
    }
}

impl<N1:BaseNum, N2:BaseNum + SupersetOf<N1>> SubsetOf<Rect<N2>> for Rect<N1>
    where Pnt2<N2>: SupersetOf<Pnt2<N1>>{
    fn is_in_subset(t: &Rect<N2>) -> bool{
        t.pos.is_in_subset() && t.width.is_in_subset() && t.height.is_in_subset()
    }

    unsafe fn from_superset_unchecked(t: &Rect<N2>) -> Rect<N1>{
        Rect{
            pos: t.pos.to_subset_unchecked(),
            width: t.width.to_subset_unchecked(),
            height: t.height.to_subset_unchecked(),
        }
    }

    fn to_superset(&self) -> Rect<N2>{
        Rect{
            pos: self.pos.to_superset(),
            width: convert(self.width),
            height: convert(self.height),
        }
    }
}

impl<T: Float + BaseNum> Rect<T>{
    pub fn aspect_ratio(&self) -> T{
        self.width / self.height
    }

    pub fn min_x(&self) -> T {
        self.pos.x.min(self.pos.x + self.width)
    }

    pub fn max_x(&self) -> T {
        self.pos.x.max(self.pos.x + self.width)
    }

    pub fn min_y(&self) -> T {
        self.pos.y.min(self.pos.y + self.height)
    }

    pub fn max_y(&self) -> T {
        self.pos.y.max(self.pos.y + self.height)
    }

    pub fn max_pos(&self) -> Pnt2<T>{
        pnt2(self.max_x(), self.max_y())
    }

    pub fn min_pos(&self) -> Pnt2<T>{
        pnt2(self.min_x(), self.min_y())
    }

    pub fn overlaps(&self, other: &Rect<T>) -> bool{
        let self_min = self.min_pos();
        let self_max = self.max_pos();
        let other_min = other.min_pos();
        let other_max = other.max_pos();
        self_min.x < other_max.x && self_max.x > other_min.x &&
        self_min.y < other_max.y && self_max.y > other_min.y
    }

    pub fn intersection(&self, other: &Rect<T>) -> Rect<T>{
        let x0 = self.min_x().max(other.min_x());
        let x1 = self.max_x().min(other.max_x());
        let width = x1 - x0;

        let y0 = self.min_y().max(other.min_y());
        let y1 = self.max_y().min(other.max_y());
        let height = y1 - y0;

        Rect{pos: pnt2(x0, y0), width, height}
    }
}


impl<T: BaseNum> Rect<T>{
    pub fn top_left(&self) -> Pnt2<T>{
        self.pos
    }

    pub fn top_right(&self) -> Pnt2<T>{
        pnt2(self.pos.x + self.width, self.pos.y)
    }

    pub fn bottom_left(&self) -> Pnt2<T>{
        pnt2(self.pos.x, self.pos.y + self.height)
    }

    pub fn bottom_right(&self) -> Pnt2<T>{
        pnt2(self.pos.x + self.width, self.pos.y + self.height)
    }

    pub fn center(&self) -> Pnt2<T> where i32: SubsetOf<T>{
        let two: T = convert(2);
        pnt2(self.pos.x + self.width, self.pos.y + self.height) / two
    }
}


impl<T: BaseNum> AsRef<[T;4]> for Rect<T>{
    fn as_ref(&self) -> &[T;4]{
        unsafe{ mem::transmute(self) }
    }
}

#[cfg(any(feature="gl", feture="gles", feature="webgl"))]
impl From<glin::Rect> for Rect<u32>{
    fn from(rect: glin::Rect) -> Rect<u32>{
        Rect{pos: pnt2(rect.left, rect.bottom), width: rect.width, height: rect.height}
    }
}

#[cfg(any(feature="gl", feture="gles", feature="webgl"))]
impl From<glin::Viewport> for Rect<i32>{
    fn from(rect: glin::Viewport) -> Rect<i32>{
        Rect{pos: pnt2(rect.x, rect.y), width: rect.width, height: rect.height}
    }
}