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

ENV_FILE="${ENV_FILE:-/etc/skd/env}"
SERVICE_URL="${SKD_UPDATE_SERVICE_URL:-}"
PROJECT_ID="${SKD_UPDATE_PROJECT_ID:-}"
TOKEN_FILE="${SKD_UPDATE_TOKEN_FILE:-}"
CLIENT_ID=""
SOFTWARE_ID="safe-kiddo"
ENROLL_TOKEN=""
OUTPUT_PATH=""

usage() {
  cat <<'EOF'
Usage: enroll_update_service.sh --enroll-token TOKEN [options]

Options:
  --service-url URL     Update-Service URL (default: SKD_UPDATE_SERVICE_URL)
  --project-id ID       Project ID (default: SKD_UPDATE_PROJECT_ID)
  --client-id ID        Client ID (default: hostname)
  --software-id ID      Software ID (default: safe-kiddo)
  --output PATH         Write token to PATH (default: SKD_UPDATE_TOKEN_FILE if set)
  --env-file PATH       Read env file (default: /etc/skd/env)
  -h, --help            Show this help
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --service-url) SERVICE_URL="$2"; shift 2 ;;
    --project-id) PROJECT_ID="$2"; shift 2 ;;
    --client-id) CLIENT_ID="$2"; shift 2 ;;
    --software-id) SOFTWARE_ID="$2"; shift 2 ;;
    --enroll-token) ENROLL_TOKEN="$2"; shift 2 ;;
    --output) OUTPUT_PATH="$2"; shift 2 ;;
    --env-file) ENV_FILE="$2"; shift 2 ;;
    -h|--help) usage; exit 0 ;;
    *) echo "Unknown option: $1" >&2; usage; exit 1 ;;
  esac
done

if [[ -f "${ENV_FILE}" ]]; then
  set -a
  # shellcheck disable=SC1090
  . "${ENV_FILE}"
  set +a
fi

SERVICE_URL="${SERVICE_URL:-${SKD_UPDATE_SERVICE_URL:-}}"
PROJECT_ID="${PROJECT_ID:-${SKD_UPDATE_PROJECT_ID:-}}"
TOKEN_FILE="${OUTPUT_PATH:-${TOKEN_FILE}}"
CLIENT_ID="${CLIENT_ID:-$(hostname)}"

if [[ -z "${SERVICE_URL}" || -z "${PROJECT_ID}" ]]; then
  echo "Missing service URL or project ID." >&2
  echo "Set SKD_UPDATE_SERVICE_URL and SKD_UPDATE_PROJECT_ID or pass --service-url/--project-id." >&2
  exit 1
fi

if [[ -z "${ENROLL_TOKEN}" ]]; then
  echo "Missing --enroll-token." >&2
  exit 1
fi

payload=$(python3 - <<PY
import json
print(json.dumps({
  "project_id": "${PROJECT_ID}",
  "client_id": "${CLIENT_ID}",
  "software_id": "${SOFTWARE_ID}",
  "enroll_token": "${ENROLL_TOKEN}"
}))
PY
)

response=$(curl -fsS -H "Content-Type: application/json" \
  -d "${payload}" "${SERVICE_URL%/}/v1/enroll")

token=$(python3 - <<PY
import json, sys
data = json.loads(sys.stdin.read())
token = data.get("token", "")
if not token:
  sys.exit("Enrollment response missing token")
print(token)
PY
<<<"${response}")

if [[ -n "${TOKEN_FILE}" ]]; then
  umask 177
  mkdir -p "$(dirname "${TOKEN_FILE}")"
  printf '%s' "${token}" > "${TOKEN_FILE}"
  chmod 600 "${TOKEN_FILE}"
  echo "Token written to ${TOKEN_FILE}"
else
  echo "${token}"
fi