import { convertCadBufferToSvg, type CadFormat } from "./cadConversion";

type CadWorkerRequest = {
  buffer: ArrayBuffer;
  format: CadFormat;
};

type CadWorkerResponse =
  | { ok: true; svg: string }
  | { ok: false; error: string };

type WorkerScope = {
  onmessage: ((event: MessageEvent<CadWorkerRequest>) => void) | null;
  postMessage: (message: CadWorkerResponse) => void;
};

const workerScope = globalThis as unknown as WorkerScope;

workerScope.onmessage = (event) => {
  try {
    const { buffer, format } = event.data;
    const svg = convertCadBufferToSvg(buffer, format);
    workerScope.postMessage({ ok: true, svg });
  } catch (error) {
    workerScope.postMessage({
      ok: false,
      error: error instanceof Error ? error.message : String(error)
    });
  }
};