import * as logger from 'firebase-functions/logger'

/**
 * Structured logging for all functions. Prefer this over `console.*`: the v2 logger attaches
 * execution/trace context automatically and supports a structured metadata object as the last arg
 * (e.g. `logger.warn('msg', { code, uid })`), which is searchable in Cloud Logging.
 */
export { logger }

/**
 * FCM registration tokens are device secrets — never log them in full. Use this to reduce a token
 * to a short, non-identifying suffix for correlation in logs.
 */
export function redactToken(token: string | null | undefined): string {
  if (!token) return '(none)'
  return token.length <= 6 ? '***' : `…${token.slice(-6)}`
}