{ config, lib, self, ... }:

let
  hostname = config.networking.hostName;
  domain = config.networking.domain or "";
  fqdn = if domain != "" then "${hostname}.${domain}" else hostname;

  # Get commit hash (handles both clean and dirty trees)
  shortRev = self.shortRev or self.dirtyShortRev or "unknown";

  # Format timestamp from lastModified (Unix timestamp)
  # lastModifiedDate is in format "YYYYMMDDHHMMSS"
  dateStr = self.sourceInfo.lastModifiedDate or "unknown";
  formattedDate = if dateStr != "unknown" then
    "${builtins.substring 0 4 dateStr}-${builtins.substring 4 2 dateStr}-${builtins.substring 6 2 dateStr} ${builtins.substring 8 2 dateStr}:${builtins.substring 10 2 dateStr} UTC"
  else
    "unknown";

  banner = ''
    ####################################
     ${fqdn}
     Commit: ${shortRev} (${formattedDate})
    ####################################
  '';
in
{
  users.motd = lib.mkDefault banner;
}