const sharp = require('sharp') as typeof import('sharp').default;

// PDFKit and the Word image renderer accept JPEG/PNG. The source bytes and
// their recorded SHA-256 remain untouched; WebP is only converted for display.
export async function renderableInspectionImage(source: Buffer): Promise<Buffer> {
  const isWebp = source.length >= 12
    && source.subarray(0, 4).toString('ascii') === 'RIFF'
    && source.subarray(8, 12).toString('ascii') === 'WEBP';
  if (!isWebp) return source;
  return sharp(source)
    .resize({ width: 1600, height: 1200, fit: 'inside', withoutEnlargement: true })
    .png()
    .toBuffer();
}