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use std::{
    fmt::{self, Debug, Display, Formatter},
    hash::{Hash, Hasher},
    ops::Deref,
};

use hashbrown::Equivalent;
use smartcow::SmartCow;

use super::{HeaderName, HeaderNameInner::UnknownHeader};

#[derive(Clone)]
pub(super) struct UnknownHeaderName<'a>(pub(super) SmartCow<'a>);

impl PartialEq for UnknownHeaderName<'_> {
    fn eq(&self, other: &Self) -> bool {
        self.0.eq_ignore_ascii_case(&other.0)
    }
}

impl Eq for UnknownHeaderName<'_> {}

impl Hash for UnknownHeaderName<'_> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        for c in self.0.as_bytes() {
            c.to_ascii_lowercase().hash(state);
        }
    }
}

impl Debug for UnknownHeaderName<'_> {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        Debug::fmt(&self.0, f)
    }
}

impl Display for UnknownHeaderName<'_> {
    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
        Display::fmt(&self.0, f)
    }
}

impl<'a> From<UnknownHeaderName<'a>> for HeaderName<'a> {
    fn from(value: UnknownHeaderName<'a>) -> Self {
        HeaderName(UnknownHeader(value))
    }
}

impl<'a> From<SmartCow<'a>> for UnknownHeaderName<'a> {
    fn from(value: SmartCow<'a>) -> Self {
        Self(value)
    }
}

impl<'a> From<UnknownHeaderName<'a>> for SmartCow<'a> {
    fn from(value: UnknownHeaderName<'a>) -> Self {
        value.0
    }
}

impl Deref for UnknownHeaderName<'_> {
    type Target = str;

    fn deref(&self) -> &Self::Target {
        &self.0
    }
}

impl Equivalent<UnknownHeaderName<'_>> for &UnknownHeaderName<'_> {
    fn equivalent(&self, key: &UnknownHeaderName<'_>) -> bool {
        key.eq_ignore_ascii_case(self)
    }
}