/**
 * Minimal structured warn-logger for scrapers. Matches the backend's
 * `${ISO} [WARN] [tag] msg key=value...` shape so warns from these files
 * grep alongside backend/src/log.ts output. Lives here (not in backend/)
 * because lib/scrapers/ is imported by both backend and Next.js code —
 * importing backend's log would cross a layering boundary.
 */

type Meta = Record<string, unknown>;

export function scraperWarn(tag: string, msg: string, meta?: Meta): void {
  const parts: string[] = [];
  if (meta) {
    for (const [k, v] of Object.entries(meta)) {
      if (v === undefined) continue;
      const s = typeof v === "string" ? v : JSON.stringify(v);
      parts.push(`${k}=${s}`);
    }
  }
  const tail = parts.length ? " " + parts.join(" ") : "";
  console.warn(`${new Date().toISOString()} [WARN] [${tag}] ${msg}${tail}`);
}