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

SERVICE_NAME="${SERVICE_NAME:-hw}"
APP_PORT="${APP_PORT:-8000}"
HEALTHCHECK_URL="${HEALTHCHECK_URL:-http://127.0.0.1/health}"

fail() {
  printf 'Verification failed: %s\n' "$1" >&2
  exit 1
}

main() {
  if ! systemctl is-active --quiet "$SERVICE_NAME"; then
    fail "systemd service '$SERVICE_NAME' is not active"
  fi

  if ! ss -tln | grep -q ":${APP_PORT} "; then
    fail "nothing is listening on TCP port ${APP_PORT}"
  fi

  health_payload="$(curl --fail --silent --show-error --max-time 10 "$HEALTHCHECK_URL")" || fail "healthcheck request failed: $HEALTHCHECK_URL"

  if ! printf '%s' "$health_payload" | grep -q '"status":"ok"\|"status": "ok"'; then
    fail "healthcheck response does not contain status=ok"
  fi

  printf 'Verification succeeded.\n'
  printf 'Service: %s\n' "$SERVICE_NAME"
  printf 'Port: %s\n' "$APP_PORT"
  printf 'Healthcheck: %s\n' "$HEALTHCHECK_URL"
}

main "$@"