/**
 * Converts a base64 data URL to a Buffer
 * @param dataUrl - Base64 data URL string (e.g., "data:image/png;base64,iVBORw0KGgo...")
 * @returns Buffer containing the binary data, or null if input is null/undefined
 */
export function base64ToBuffer(dataUrl: string | null | undefined): Buffer | null {
  if (!dataUrl) {
    return null
  }

  // Extract the base64 data from the data URL
  // Format: data:image/png;base64,<base64-encoded-data>
  const base64Match = dataUrl.match(/^data:([A-Za-z-+\/]+);base64,(.+)$/)

  if (!base64Match) {
    // If it's not a data URL, assume it's already base64 encoded
    return Buffer.from(dataUrl, "base64")
  }

  const base64Data = base64Match[2]
  return Buffer.from(base64Data, "base64")
}

export default base64ToBuffer