//! Release version. Releases are named vYYYYMM-NNNNN (a counter per month, from 00001);
//! the release build sets CODECRAFT_VERSION (without the leading "v"). Builds without it
//! (development) fall back to the crate version.

pub const VERSION: &str = match option_env!("CODECRAFT_VERSION") {
    Some(v) if !v.is_empty() => v,
    _ => env!("CARGO_PKG_VERSION"),
};

/// Sort key: monthly releases (YYYYMM-NNNNN) come after the old semantic versions.
fn key(v: &str) -> (u8, Vec<u64>) {
    let v = v.trim().trim_start_matches('v');
    if let Some((month, n)) = v.split_once('-')
        && month.len() == 6
        && month.chars().all(|c| c.is_ascii_digit())
        && !n.is_empty()
        && n.chars().all(|c| c.is_ascii_digit())
    {
        return (1, vec![month.parse().unwrap_or(0), n.parse().unwrap_or(0)]);
    }
    (0, v.split(['.', '-']).take(3).map(|x| x.parse::<u64>().unwrap_or(0)).collect())
}

/// Is version `a` newer than `b`? Accepts both schemes, with or without "v".
pub fn newer(a: &str, b: &str) -> bool {
    key(a) > key(b)
}

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

    #[test]
    fn compares_monthly_and_semver() {
        assert!(newer("v202611-00002", "202611-00001"));
        assert!(newer("v202612-00001", "v202611-00042"));
        assert!(!newer("v202611-00001", "202611-00001"));
        assert!(newer("v202611-00001", "0.1.0"));
        assert!(!newer("0.9.9", "v202611-00001"));
        assert!(newer("v0.2.0", "0.1.9"));
        assert!(newer("1.0.0", "0.9.9"));
    }
}