use super::*;

/// A numeric type that can be used as coordinate.
///
/// FIXME: Replace with `num` crate?
/// FIXME: Use AsRef/AsMut?
///
/// ```
/// use tengri::draw::Coord;
/// let a: u16 = Coord::zero();
/// let b: u16 = a.plus(1);
/// let c: u16 = a.minus(2);
/// let d = a.atomic();
/// ```
pub trait Coord: Send + Sync + Copy
    + Add<Self, Output=Self>
    + Sub<Self, Output=Self>
    + Mul<Self, Output=Self>
    + Div<Self, Output=Self>
    + Ord + PartialEq + Eq
    + Debug + Display + Default
    + From<u16> + Into<u16>
    + Into<usize>
    + Into<f64>
    + std::iter::Step
{
    /// Zero in own type.
    fn zero () -> Self { 0.into() }
    /// Addition.
    fn plus (self, other: Self) -> Self;
    /// Saturating subtraction.
    fn minus  (self, other: Self) -> Self { if self >= other { self - other } else { 0.into() } }
    /// Convert to [AtomicUsize].
    fn atomic (self) -> AtomicUsize { AtomicUsize::new(self.into()) }
}