//! Iroh protocol constants and stream helpers.

/// ALPN for git-remote-iroh connections.
pub const GIT_IROH_ALPN: &[u8] = b"git/iroh/0";

/// Stream header sent at the start of a git stream.
/// Identifies whether this is a push (receive-pack) or fetch (upload-pack).
#[derive(Debug, Clone, Copy, PartialEq)]
pub enum GitOp {
    /// Client wants to push (server runs git-receive-pack)
    Push,
    /// Client wants to fetch (server runs git-upload-pack)
    Fetch,
}

impl GitOp {
    pub fn to_byte(self) -> u8 {
        match self {
            GitOp::Push => 1,
            GitOp::Fetch => 2,
        }
    }

    pub fn from_byte(b: u8) -> Option<Self> {
        match b {
            1 => Some(GitOp::Push),
            2 => Some(GitOp::Fetch),
            _ => None,
        }
    }

    /// The git command to run on the server side.
    pub fn server_command(self) -> &'static str {
        match self {
            GitOp::Push => "git-receive-pack",
            GitOp::Fetch => "git-upload-pack",
        }
    }
}