use std::{fmt::Display, str::FromStr};

use error::Error;
use oci_spec::image::Digest;
use regex::Regex;
use relative_path::RelativePath;

pub mod address;
pub mod error;
pub mod oci_interface;
pub mod storage;

#[cfg(feature = "axum")]
pub mod axum;

#[cfg(feature = "storage-fs")]
pub mod storage_fs;

const NAME_REGEXP_MATCH: &str =
    r"[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*(\/[a-z0-9]+((\.|_|__|-+)[a-z0-9]+)*)*";

#[derive(Clone, Debug)]
pub enum TagOrDigest {
    Tag(String),
    Digest(Digest)
}

// TODO: Consider 255 char namespace limit - hostname length per spec docs
#[derive(Clone)]
pub struct Namespace(String);

impl Namespace {
    pub fn path(&self) -> &RelativePath {
        RelativePath::new(&self.0)
    }
}

impl FromStr for Namespace {
    type Err = Error;

    fn from_str(s: &str) -> Result<Self, Self::Err> {
        let regexp = Regex::new(NAME_REGEXP_MATCH).unwrap();
        if regexp.is_match(s) {
            Ok(Namespace(s.to_string()))
        } else {
            Err(Error::Namespace(s.to_string()))
        }
    }
}

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

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

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

    #[test]
    fn namespace() {
        Namespace::from_str("fuu").unwrap();
        Namespace::from_str("fuu/bar").unwrap();
        Namespace::from_str("fuu/bar/baz/").unwrap();
        Namespace::from_str("fuu/bar/baz/qux").unwrap();
    }
}