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use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};

use alloc::string::String;
use alloc::vec::Vec;

#[cfg(feature = "std")]
use std::{
    ffi::{CStr, CString, OsStr, OsString},
    path::{Path, PathBuf},
};

use crate::{Cow, Dairy};

impl<'a, 'b, T, U> PartialEq<Cow<'b, U>> for Cow<'a, T>
where
    T: ?Sized + Dairy<'a> + PartialEq<U>,
    U: ?Sized + Dairy<'b>,
{
    #[inline]
    fn eq(&self, other: &Cow<'b, U>) -> bool {
        PartialEq::eq(&**self, &**other)
    }
}

impl<'a, T> Eq for Cow<'a, T> where T: ?Sized + Dairy<'a> + Eq {}

impl<'a, T> PartialOrd for Cow<'a, T>
where
    T: ?Sized + Dairy<'a> + PartialOrd,
{
    #[inline]
    fn partial_cmp(&self, other: &Cow<'a, T>) -> Option<Ordering> {
        PartialOrd::partial_cmp(&**self, &**other)
    }
}

impl<'a, T> Ord for Cow<'a, T>
where
    T: ?Sized + Dairy<'a> + Ord,
{
    #[inline]
    fn cmp(&self, other: &Self) -> Ordering {
        Ord::cmp(&**self, &**other)
    }
}

macro_rules! impl_basic {
    ($(
        $(#[$attrs:meta])*
        { $Ty:ty, $To:ty $(, { $($bound:tt)+ })? }
    )+) => {
        $(
            $(#[$attrs])*
            impl<'a $(, $($bound)+)?> PartialEq<$To> for Cow<'a, $Ty> {
                #[inline]
                fn eq(&self, other: &$To) -> bool {
                    PartialEq::eq(&**self, &*other)
                }
            }

            $(#[$attrs])*
            impl<'a $(, $($bound)+)?> PartialEq<&$To> for Cow<'a, $Ty> {
                #[inline]
                fn eq(&self, other: &&$To) -> bool {
                    PartialEq::eq(&**self, &**other)
                }
            }
        )+
    };
}

impl_basic! {
    ////////////////////////////////////////////////////////////////////////////
    // Cow<str>
    ////////////////////////////////////////////////////////////////////////////

    { str, str }

    { str, String }

    #[cfg(feature = "std")]
    { str, OsStr }

    #[cfg(feature = "std")]
    { str, OsString }

    ////////////////////////////////////////////////////////////////////////////
    // Cow<[T]>
    ////////////////////////////////////////////////////////////////////////////

    { [T], [U], { T: 'a + Clone + PartialEq<U>, U } }

    { [T], Vec<U>, { T: 'a + Clone + PartialEq<U>, U } }

    { [T], [U; N], { T: 'a + Clone + PartialEq<U>, U, const N: usize } }

    ////////////////////////////////////////////////////////////////////////////
    // Cow<CStr>
    ////////////////////////////////////////////////////////////////////////////

    #[cfg(feature = "std")]
    { CStr, CStr }

    #[cfg(feature = "std")]
    { CStr, CString }

    ////////////////////////////////////////////////////////////////////////////
    // Cow<OsStr>
    ////////////////////////////////////////////////////////////////////////////

    #[cfg(feature = "std")]
    { OsStr, OsStr }

    #[cfg(feature = "std")]
    { OsStr, OsString }

    #[cfg(feature = "std")]
    { OsStr, Path }

    #[cfg(feature = "std")]
    { OsStr, PathBuf }

    ////////////////////////////////////////////////////////////////////////////
    // Cow<Path>
    ////////////////////////////////////////////////////////////////////////////

    #[cfg(feature = "std")]
    { Path, Path }

    #[cfg(feature = "std")]
    { Path, PathBuf }

    #[cfg(feature = "std")]
    { Path, OsStr }

    #[cfg(feature = "std")]
    { Path, OsString }
}