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

#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct Path<'a>(BoasStr<'a>);

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

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

    pub fn as_str(&self) -> &str {
        &*self.0
    }

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

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

impl Path<'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, InvalidPath> {
        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!("Failed to validate static InvalidPath."),
        }
    }
}

impl<'a> TryFrom<&'a str> for Path<'a> {
    type Error = InvalidPath;

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

impl<'a> TryFrom<String> for Path<'a> {
    type Error = InvalidPath;

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

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

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

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

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

impl Borrow<str> for Path<'_> {
    fn borrow(&self) -> &str {
        self.0.borrow()
    }
}

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

impl PartialEq<&'_ str> for Path<'_> {
    fn eq(&self, &other: &&str) -> bool {
        self == other
    }
}

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

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

impl Error for InvalidPath {}

const fn validate(bytes: &[u8]) -> Result<(), InvalidPath> {
    match inner_validate(bytes) {
        Ok(x) => Ok(x),
        Err(e) => Err(InvalidPath(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_path_char(byte) {
                return Err(InvalidComponent::Byte(InvalidByte { index, byte }));
            }
            index += 1;
        }
    }
    Ok(())
}

const fn is_normal_path_char(b: u8) -> bool {
    is_unreserved(b) || is_sub_delimiter(b) || matches!(b, b':' | b'@' | b'/')
}

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

    #[test]
    fn asterisk() {
        let string = "*";
        assert_matches!(Path::try_from(string), Ok(info) => assert_eq!(info, string));
    }
}