// Screen cart for restricted items before allowing checkout to proceed
async function screenForRestrictions(params: {
  orderLines: { productId: string; hsCode?: string }[];
  destinationCountry: string;
}): Promise<{ allowed: boolean; blockedItems: string[] }> {
  const blockedItems: string[] = [];

  // Common restrictions — seed these from a country-restrictions database
  const RESTRICTIONS: Record<string, string[]> = {
    AU: ['9305'],    // Firearm parts
    IN: ['2207'],    // Alcohol (requires import licence)
    CN: ['8517'],    // Consumer electronics require CCC certification
  };

  const countryRestrictions = RESTRICTIONS[params.destinationCountry] ?? [];

  for (const line of params.orderLines) {
    if (!line.hsCode) continue;
    const hsPrefixBlocked = countryRestrictions.some(prefix => line.hsCode!.startsWith(prefix));
    if (hsPrefixBlocked) {
      blockedItems.push(line.productId);
    }
  }

  return { allowed: blockedItems.length === 0, blockedItems };
}