use std::{usize, u8, u16, u32, u64};
use std::{isize, i8, i16, i32, i64};
use std::{f32, f64};
use std::num::Wrapping;

/// Numbers which have upper and lower bounds
pub trait Bounded {
    /// returns the smallest finite number this type can represent
    const MIN: Self;
    #[inline]
    fn min_value() -> Self where Self: Sized {
        Self::MIN
    }
    /// returns the largest finite number this type can represent
    const MAX: Self;
    #[inline]
    fn max_value() -> Self where Self: Sized {
        Self::MAX
    }
}

macro_rules! bounded_impl {
    ($t:ty, $min:expr, $max:expr) => {
        impl Bounded for $t {
            const MIN: $t = $min;
            const MAX: $t = $max;
        }
    }
}

bounded_impl!(usize, usize::MIN, usize::MAX);
bounded_impl!(u8,    u8::MIN,    u8::MAX);
bounded_impl!(u16,   u16::MIN,   u16::MAX);
bounded_impl!(u32,   u32::MIN,   u32::MAX);
bounded_impl!(u64,   u64::MIN,   u64::MAX);

bounded_impl!(isize, isize::MIN, isize::MAX);
bounded_impl!(i8,    i8::MIN,    i8::MAX);
bounded_impl!(i16,   i16::MIN,   i16::MAX);
bounded_impl!(i32,   i32::MIN,   i32::MAX);
bounded_impl!(i64,   i64::MIN,   i64::MAX);

impl<T: Bounded> Bounded for Wrapping<T> {

    const MIN: Self = Wrapping(T::MIN);
    const MAX: Self = Wrapping(T::MAX);
}

bounded_impl!(f32, f32::MIN, f32::MAX);

macro_rules! for_each_tuple_ {
    ( $m:ident !! ) => (
        $m! { }
    );
    ( $m:ident !! $h:ident, $($t:ident,)* ) => (
        $m! { $h $($t)* }
        for_each_tuple_! { $m !! $($t,)* }
    );
}
macro_rules! for_each_tuple {
    ( $m:ident ) => (
        for_each_tuple_! { $m !! A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, }
    );
}

macro_rules! bounded_tuple {
    ( $($name:ident)* ) => (
        impl<$($name: Bounded,)*> Bounded for ($($name,)*) {
            const MIN: Self = ($($name::MIN,)*);
            const MAX: Self = ($($name::MAX,)*);
        }
    );
}

for_each_tuple!(bounded_tuple);
bounded_impl!(f64, f64::MIN, f64::MAX);


#[test]
fn wrapping_bounded() {
    macro_rules! test_wrapping_bounded {
        ($($t:ty)+) => {
            $(
                assert_eq!(Wrapping::<$t>::min_value().0, <$t>::min_value());
                assert_eq!(Wrapping::<$t>::max_value().0, <$t>::max_value());
            )+
        };
    }

    test_wrapping_bounded!(usize u8 u16 u32 u64 isize i8 i16 i32 i64);
}

#[test]
fn wrapping_is_bounded() {
    fn require_bounded<T: Bounded>(_: &T) {}
    require_bounded(&Wrapping(42_u32));
    require_bounded(&Wrapping(-42));
}