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// License: see LICENSE file at root directory of `master` branch

//! # Either singular or plural

use crate::Plural;

/// # Either singular or plural
///
/// ## Examples
///
/// ```
/// use plurals::{Either, Plural};
///
/// const FOOT: Either = Either::new("foot", "feet");
///
/// assert_eq!(FOOT.fmt(0), "feet");
/// assert_eq!(FOOT.fmt(1), "foot");
/// assert_eq!(FOOT.fmt(2), "feet");
/// assert_eq!(FOOT.fmt(3), "feet");
/// ```
#[derive(Debug, Eq, PartialEq, Hash)]
pub struct Either<'a> {
    singular: &'a str,
    plural: &'a str,
}

impl<'a> Either<'a> {

    /// # Makes new instance
    pub const fn new(singular: &'a str, plural: &'a str) -> Self {
        Self {
            singular,
            plural,
        }
    }

    /// # Singular
    pub fn singular(&self) -> &str {
        self.singular
    }

    /// # Plural
    pub fn plural(&self) -> &str {
        self.plural
    }

}

macro_rules! impl_plural_for_unsigned_integers {
    ($($ty: ty, $test_fn_name: tt,)+) => {
        $(
            #[test]
            fn $test_fn_name() {
                assert_eq!(<$ty>::min_value(), 0);
            }

            impl<'a> Plural<$ty> for Either<'a> {

                fn fmt(&self, x: $ty) -> &str {
                    match x {
                        1 => self.singular,
                        _ => self.plural,
                    }
                }

            }
        )+
    }
}

impl_plural_for_unsigned_integers!(
    u8, test_impl_plural_for_u8,
    u16, test_impl_plural_for_u16,
    u32, test_impl_plural_for_u32,
    u64, test_impl_plural_for_u64,
    u128, test_impl_plural_for_u128,
    usize, test_impl_plural_for_usize,
);

macro_rules! impl_plural_for_signed_integers {
    ($($ty: ty, $test_fn_name: tt,)+) => {
        $(
            #[test]
            fn $test_fn_name() {
                assert!(<$ty>::min_value() < 0);
            }

            impl<'a> Plural<$ty> for Either<'a> {

                fn fmt(&self, x: $ty) -> &str {
                    match x {
                        1 | -1 => self.singular,
                        _ => self.plural,
                    }
                }

            }
        )+
    }
}

impl_plural_for_signed_integers!(
    i8, test_impl_plural_for_i8,
    i16, test_impl_plural_for_i16,
    i32, test_impl_plural_for_i32,
    i64, test_impl_plural_for_i64,
    i128, test_impl_plural_for_i128,
    isize, test_impl_plural_for_isize,
);

macro_rules! impl_plural_for_floats {
    ($($ty: ty, $test_fn_name: tt,)+) => {
        $(
            #[test]
            fn $test_fn_name() {
                assert!(<$ty>::from(0.0) >= 0.0);
            }

            impl<'a> Plural<$ty> for Either<'a> {

                fn fmt(&self, _: $ty) -> &str {
                    self.plural
                }

            }
        )+
    }
}

impl_plural_for_floats!(
    f32, test_impl_plural_for_f32,
    f64, test_impl_plural_for_f64,
);