use crate::*;
use std::fmt::Debug;

pub trait Size<N: Coordinate>: From<[N;2]> + Debug + Copy {
    fn x (&self) -> N;
    fn y (&self) -> N;
    #[inline] fn w (&self) -> N { self.x() }
    #[inline] fn h (&self) -> N { self.y() }
    #[inline] fn wh (&self) -> [N;2] { [self.x(), self.y()] }
    #[inline] fn clip_w (&self, w: N) -> [N;2] { [self.w().min(w), self.h()] }
    #[inline] fn clip_h (&self, h: N) -> [N;2] { [self.w(), self.h().min(h)] }
    #[inline] fn expect_min (&self, w: N, h: N) -> Usually<&Self> {
        if self.w() < w || self.h() < h {
            Err(format!("min {w}x{h}").into())
        } else {
            Ok(self)
        }
    }
    #[inline] fn zero () -> [N;2] {
        [N::zero(), N::zero()]
    }
    #[inline] fn to_area_pos (&self) -> [N;4] {
        let [x, y] = self.wh();
        [x, y, 0.into(), 0.into()]
    }
    #[inline] fn to_area_size (&self) -> [N;4] {
        let [w, h] = self.wh();
        [0.into(), 0.into(), w, h]
    }
}

impl<N: Coordinate> Size<N> for (N, N) {
    #[inline] fn x (&self) -> N { self.0 }
    #[inline] fn y (&self) -> N { self.1 }
}

impl<N: Coordinate> Size<N> for [N;2] {
    #[inline] fn x (&self) -> N { self[0] }
    #[inline] fn y (&self) -> N { self[1] }
}