#[derive(Clone, Debug)]
pub struct RefUpdate {
    pub name: String,
    pub old_oid: String,
    pub new_oid: String,
}

impl RefUpdate {
    /// Parse git reference update commands from SSH protocol text.
    /// Format: "<old-oid> <new-oid> <ref-name>\n"
    pub fn parse_ref_updates(data: &[u8]) -> Result<Vec<Self>, String> {
        let text = String::from_utf8_lossy(data);
        let mut refs = Vec::new();
        for line in text.lines() {
            let line = line.trim();
            if line.is_empty() || line.starts_with('#') || line.starts_with("PACK") {
                continue;
            }
            let mut parts = line.split_whitespace();
            let old_oid = parts.next().map(|s| s.to_string()).unwrap_or_default();
            let new_oid = parts.next().map(|s| s.to_string()).unwrap_or_default();
            let name = parts
                .next()
                .unwrap_or("")
                .trim_start_matches('\0')
                .to_string();
            if !name.is_empty() {
                refs.push(RefUpdate {
                    old_oid,
                    new_oid,
                    name,
                });
            }
        }
        Ok(refs)
    }
}