Local Address Formats by Country

// Option A: fetch at build time (Next.js RSC)
const res = await fetch(
  'https://www.geoapify.com/assets/address-template-by-country.json',
  { next: { revalidate: 86400 } }   // revalidate daily
);
const templates = await res.json();

// Option B: bundle locally (faster, works offline)
// Download the JSON and import as a module:
import templates from './data/address-templates.json';

export interface AddressValues {
  contact_name?: string;
  house?: string;
  house_number?: string;
  road?: string;
  suburb?: string;
  settlement_part?: string;
  settlement?: string;
  county?: string;
  region?: string;
  postcode?: string;
  country?: string;
}

export function formatAddress(
  countryCode: string,
  values: AddressValues,
  templates: { code: string; format: string }[]
): string {
  const tpl = templates.find((t) => t.code === countryCode);
  if (!tpl) return Object.values(values).filter(Boolean).join(', ');

  let result = tpl.format;
  for (const [key, val] of Object.entries(values)) {
    result = result.replaceAll(`[${key}]`, val ?? '');
  }
  // Remove empty lines
  return result.split('\n').map(l => l.trim()).filter(Boolean).join('\n');
}

import { formatAddress } from '@/utils/address';
import templates from '@/lib/data/address-templates.json';

export default async function OrderPage({ params }) {
  const order = await getOrder(params.id);

  const formatted = formatAddress('DE', {
    contact_name: order.customer.name,
    road:         order.shipping.street,
    house_number: order.shipping.number,
    postcode:     order.shipping.zip,
    settlement:   order.shipping.city,
    country:      'Deutschland',
  }, templates);

  return (
    <address className="not-italic whitespace-pre-wrap font-mono text-sm">
      {formatted}
    </address>
  );
}