import { parentPort } from "node:worker_threads";
import { createHash } from "node:crypto";
import type { Entry } from "./upsertBatch.ts";

function sha1(value: string): string {
  return createHash("sha1").update(value).digest("hex").toUpperCase();
}

parentPort?.on("message", (lines: string[]) => {
  const entries: Entry[] = lines.map((line) => {
    const hash = sha1(line);
    return { prefix: hash.slice(0, 5), suffix: hash.slice(5), count: 1 };
  });
  parentPort!.postMessage(entries);
});