export async function generatePdfThumbnail(pdfSource, targetWidth = 200) {
  const { pdfToPng } = await import('pdfconvert-wasm');
  const images = await pdfToPng(pdfSource, {
    firstPage: 1,
    singleFile: true,
    scaleToX: targetWidth,
  });

  if (!images || images.length === 0) {
    return null;
  }

  const blob = new Blob([images[0].data], { type: 'image/png' });
  return new Promise((resolve, reject) => {
    const reader = new FileReader();
    reader.onloadend = () => resolve(reader.result);
    reader.onerror = reject;
    reader.readAsDataURL(blob);
  });
}