#!/usr/bin/env bash

legacy_instance_dir="$STATE_DIRECTORY/$(hostname)"
instance_dir="$STATE_DIRECTORY/$1"
runner_url="$2"
runner_config_file="$3"
shift 3
runner_labels="$(IFS=,; printf '%s' "$*")"

if [ ! -e "$instance_dir" ] && [ -d "$legacy_instance_dir" ]; then
  mv "$legacy_instance_dir" "$instance_dir"
fi

mkdir -vp "$instance_dir"
cd "$instance_dir" || exit 1

token_hash_file="$instance_dir/.token-hash"
token_hash_current="$(printf '%s' "$TOKEN" | sha256sum | cut -d' ' -f1)"
token_hash_stored="$(cat "$token_hash_file" 2>/dev/null || echo "")"
labels_file="$instance_dir/.labels"
labels_wanted="$(printf '%s\n' "$@" | sort)"
labels_current="$(cat "$labels_file" 2>/dev/null || echo 0)"

if [ ! -e "$instance_dir/.runner" ] || [ "$labels_wanted" != "$labels_current" ] || [ "$token_hash_current" != "$token_hash_stored" ]; then
  rm -v "$instance_dir/.runner" || true

  gitea-runner register --no-interactive \
    --instance "$runner_url" \
    --token "$TOKEN" \
    --name "jeeves-$(hostname)" \
    --labels "$runner_labels" \
    --config "$runner_config_file"

  printf '%s' "$token_hash_current" > "$token_hash_file"
  printf '%s\n' "$labels_wanted" > "$labels_file"
fi