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use num::arithmetic::traits::UnsignedAbs;
use num::comparison::traits::{OrdAbs, PartialOrdAbs};
use std::cmp::Ordering;

macro_rules! impl_partial_ord_abs {
    ($t:ident) => {
        impl PartialOrdAbs<$t> for $t {
            /// Compares the absolute values of two numbers, taking both by reference.
            ///
            /// The [`PartialOrdAbs`](super::traits::PartialOrdAbs) interface allows for pairs of
            /// incomparable elements, but for primitive integers these never occur.
            ///
            /// # Worst-case complexity
            /// Constant time and additional memory.
            ///
            /// # Examples
            /// See [here](super::cmp_abs#partial_cmp_abs).
            #[inline]
            fn partial_cmp_abs(&self, other: &$t) -> Option<Ordering> {
                Some(self.cmp_abs(other))
            }
        }
    };
}
apply_to_primitive_ints!(impl_partial_ord_abs);

macro_rules! impl_ord_abs_unsigned {
    ($t:ident) => {
        impl OrdAbs for $t {
            /// Compares the absolute values of two numbers, taking both by reference.
            ///
            /// For unsigned values, this is the same as ordinary comparison.
            ///
            /// # Worst-case complexity
            /// Constant time and additional memory.
            ///
            /// # Examples
            /// See [here](super::cmp_abs#cmp_abs).
            #[inline]
            fn cmp_abs(&self, other: &Self) -> Ordering {
                self.cmp(other)
            }
        }
    };
}
apply_to_unsigneds!(impl_ord_abs_unsigned);

fn cmp_abs_signed<U: Ord, S: Copy + UnsignedAbs<Output = U>>(x: &S, y: &S) -> Ordering {
    x.unsigned_abs().cmp(&y.unsigned_abs())
}

macro_rules! impl_ord_abs_signed {
    ($t:ident) => {
        impl OrdAbs for $t {
            /// Compares the absolute values of two numbers, taking both by reference.
            ///
            /// # Worst-case complexity
            /// Constant time and additional memory.
            ///
            /// # Examples
            /// See [here](super::cmp_abs#cmp_abs).
            #[inline]
            fn cmp_abs(&self, other: &Self) -> Ordering {
                cmp_abs_signed(self, other)
            }
        }
    };
}
apply_to_signeds!(impl_ord_abs_signed);