address 0.20.0-rc.2

use crate::ParseError::InvalidDomain;
use crate::{Domain, DomainRef, ParseError, impl_parse_ref};

impl_parse_ref!(
    DomainRef,
    "The name must already be in lowercase. Use [`Domain`](crate::Domain) to parse mixed-case input."
);

impl<'a> TryFrom<&'a [u8]> for DomainRef<'a> {
    type Error = ParseError;

    /// The name must already be in lowercase. Use [`Domain`](crate::Domain) to parse mixed-case input.
    fn try_from(name: &'a [u8]) -> Result<Self, Self::Error> {
        if Domain::is_valid_name(name, false) {
            let name: &str = std::str::from_utf8(name).map_err(|_| InvalidDomain)?;
            Ok(unsafe { Self::new_unchecked(name) })
        } else {
            Err(InvalidDomain)
        }
    }
}

#[cfg(test)]
mod tests {
    use crate::ParseError::InvalidDomain;
    use crate::{DomainRef, ParseError};

    #[test]
    fn try_from_str() {
        let result: Result<DomainRef, ParseError> = DomainRef::try_from("localhost");
        let expected: Result<DomainRef, ParseError> = Ok(DomainRef::LOCALHOST);
        assert_eq!(result, expected);

        let result: Result<DomainRef, ParseError> = DomainRef::try_from("LocalHost");
        let expected: Result<DomainRef, ParseError> = Err(InvalidDomain);
        assert_eq!(result, expected);
    }

    #[test]
    fn try_from_slice() {
        let test_cases: &[(&[u8], Result<DomainRef, ParseError>)] = &[
            ("localhost".as_bytes(), Ok(DomainRef::LOCALHOST)),
            ("LocalHost".as_bytes(), Err(InvalidDomain)),
            (b"\xFF".as_slice(), Err(InvalidDomain)),
            ("ü".as_bytes(), Err(InvalidDomain)),
        ];

        for (input, expected) in test_cases {
            let result: Result<DomainRef, ParseError> = DomainRef::try_from(*input);
            assert_eq!(result, *expected, "input={:?}", input);
        }
    }
}