//! [ls-refs][lsr] is sent from the client when they want to see what refs we have
//! on the server, we're generating our commits on the fly though so we'll just tell
//! them we have a master branch with whatever the generated commit hash is.
//!
//! [lsr]: https://git-scm.com/docs/protocol-v2/2.19.0#_ls_refs

use bytes::Bytes;
use packfile::{low_level::HashOutput, PktLine};
use thrussh::{server::Session, ChannelId};
use tracing::instrument;

use crate::{Handler, PackageProvider, UserProvider};

#[instrument(skip(handle, session, channel, _metadata, commit_hash), err)]
pub fn handle<U: UserProvider + PackageProvider + Send + Sync + 'static>(
    handle: &mut Handler<U>,
    session: &mut Session,
    channel: ChannelId,
    _metadata: &[Bytes],
    commit_hash: &HashOutput,
) -> Result<(), anyhow::Error> {
    let commit_hash = hex::encode(commit_hash);

    handle.write(PktLine::Data(
        format!("{commit_hash} HEAD symref-target:refs/heads/master").as_bytes(),
    ))?;
    handle.write(PktLine::Flush)?;
    handle.flush(session, channel);

    Ok(())
}