// Planned: Custom worker with transferable objects
// Note: This is a simplified example. Production requires error handling,
// timeouts, and worker pool management (see Production Considerations section)

const worker = new Worker(new URL('./pdf.worker.ts', import.meta.url));

export function parsePdfInWorker(file: File): Promise<string> {
  return new Promise(async (resolve, reject) => {
    const buffer = await file.arrayBuffer();

    // Set 30-second timeout for parsing
    const timeout = setTimeout(() => {
      reject(new Error('PDF parsing timeout - falling back to backend'));
    }, 30000);

    // Handle successful parsing
    worker.onmessage = (e) => {
      clearTimeout(timeout);

      if (e.data.error) {
        reject(new Error(e.data.error));
      } else {
        resolve(e.data.text);
      }
    };

    // Handle worker errors
    worker.onerror = (err) => {
      clearTimeout(timeout);
      reject(err);
    };

    // Zero-copy transfer ownership to worker
    // After this line, 'buffer' becomes detached and unusable in main thread
    worker.postMessage({ buffer }, [buffer]);
  });
}

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