#!/usr/bin/env bash
set -euo pipefail

hostname=$(hostname --short)
root=""
ngcroot=""

while [[ $# -gt 0 ]]; do
case $1 in
--root)
  root=$2
  ngcroot="--root ${root}"
  shift
  shift
  ;;
--hostname)
  hostname=$2
  shift
  shift
  ;;
*)
  echo "unknown option: $1"
  exit 1
  ;;
esac
done

mkdir -p "${root}/etc/nixos"

if [[ ! -d "${root}/etc/nixos/.git" ]]; then
git clone https://git.clerie.de/clerie/nixfiles.git "${root}/etc/nixos"
git -C "${root}/etc/nixos" remote set-url origin gitea@git.clerie.de:clerie/nixfiles.git
fi

mkdir -p "${root}/etc/nixos/hosts/${hostname}"

nixos-generate-config ${ngcroot} --dir "${root}/etc/nixos/hosts/${hostname}"

# make sure host is added to flake.nix
if ! grep -q "${hostname} = generateNixosSystem \"${hostname}\";" "${root}/etc/nixos/flake.nix"; then
sed -i "s/\(\s*\)_iso = generateNixosSystem \"_iso\";/\1${hostname} = generateNixosSystem \"${hostname}\";\n&/g" "${root}/etc/nixos/flake.nix"
fi

sed -i "s/\%HOSTNAME\%/${hostname}/g" "${root}/etc/nixos/hosts/${hostname}/configuration.nix"

git -C "${root}/etc/nixos" add "${root}/etc/nixos/hosts/${hostname}"