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use crate::validation::{
    is_sub_delimiter, is_unreserved, validate_percent_encoding, InvalidByte, InvalidComponent,
};
use boar_::BoasStr;
use std::{
    convert::TryFrom,
    error::Error,
    fmt,
    hash::{Hash, Hasher},
};

#[derive(Debug, Clone)]
pub struct HostName<'a>(BoasStr<'a>);

impl<'a> HostName<'a> {
    pub fn new() -> Self {
        Self(BoasStr::Static(""))
    }

    fn internal_try_from(string: BoasStr<'a>) -> Result<Self, InvalidHostName> {
        validate(string.as_bytes())?;
        Ok(Self(string))
    }

    pub fn as_str(&self) -> &str {
        self.as_ref()
    }

    pub fn into_static(self) -> HostName<'static> {
        HostName(self.0.into_static())
    }

    pub fn to_borrowed(&self) -> HostName {
        HostName(self.0.to_borrowed())
    }
}

impl HostName<'static> {
    #[inline]
    pub fn ensure_static(&mut self) {
        self.0.ensure_static()
    }

    #[inline]
    pub fn into_ensured_static(mut self) -> Self {
        self.ensure_static();
        self
    }

    pub fn try_from_static(string: &'static str) -> Result<Self, InvalidHostName> {
        Self::internal_try_from(BoasStr::Static(string))
    }

    #[track_caller]
    pub const fn from_static(string: &'static str) -> Self {
        match validate(string.as_bytes()) {
            Ok(()) => Self(BoasStr::Static(string)),
            Err(_e) => panic!("invalid static HostName"),
        }
    }
}

impl<'a> TryFrom<&'a str> for HostName<'a> {
    type Error = InvalidHostName;

    fn try_from(string: &'a str) -> Result<Self, InvalidHostName> {
        Self::internal_try_from(BoasStr::Borrowed(string))
    }
}

impl<'a> TryFrom<String> for HostName<'a> {
    type Error = InvalidHostName;

    fn try_from(string: String) -> Result<Self, InvalidHostName> {
        Self::internal_try_from(BoasStr::Owned(string))
    }
}

#[cfg(feature = "boar")]
impl<'a> TryFrom<BoasStr<'a>> for HostName<'a> {
    type Error = InvalidHostName;

    fn try_from(string: BoasStr<'a>) -> Result<Self, InvalidHostName> {
        Self::internal_try_from(string)
    }
}

impl<'a> Default for HostName<'a> {
    fn default() -> Self {
        Self::new()
    }
}

impl<'a> Eq for HostName<'a> {}

impl<'a> Hash for HostName<'a> {
    fn hash<H: Hasher>(&self, state: &mut H) {
        for byte in self.0.bytes() {
            state.write_u8(byte.to_ascii_lowercase())
        }
    }
}

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

impl<'a> PartialEq<str> for HostName<'a> {
    fn eq(&self, other: &str) -> bool {
        self.0.eq_ignore_ascii_case(other)
    }
}

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

impl AsRef<str> for HostName<'_> {
    fn as_ref(&self) -> &str {
        self.0.as_ref()
    }
}

#[derive(Debug, Clone)]
pub struct InvalidHostName(InvalidComponent);

impl fmt::Display for InvalidHostName {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "invalid host name (registered name): {}", self.0)
    }
}

impl Error for InvalidHostName {}

const fn validate(bytes: &[u8]) -> Result<(), InvalidHostName> {
    match inner_validate(bytes) {
        Ok(x) => Ok(x),
        Err(e) => Err(InvalidHostName(e)),
    }
}

const fn inner_validate(bytes: &[u8]) -> Result<(), InvalidComponent> {
    let mut index = 0;
    while index < bytes.len() {
        let byte = bytes[index];
        if byte == b'%' {
            match validate_percent_encoding(index, bytes) {
                Err(e) => return Err(InvalidComponent::PercentEncoded(e)),
                Ok(next_index) => index = next_index,
            }
        } else {
            if !is_normal_host_name_char(byte) {
                return Err(InvalidComponent::Byte(InvalidByte { index, byte }));
            }
            index += 1;
        }
    }
    Ok(())
}

const fn is_normal_host_name_char(b: u8) -> bool {
    is_unreserved(b) || is_sub_delimiter(b)
}

#[cfg(test)]
mod tests {
    use super::*;
    use assert_matches::assert_matches;

    #[test]
    fn default_is_valid() {
        assert_matches!(validate(HostName::default().as_str().as_bytes()), Ok(_));
    }
}