import type { Metadata } from "next";
import { getCurrentCustomer } from "@/lib/auth";
import { getAddressesForCustomer } from "@/lib/account-data";
import { getShippingTiers } from "@/lib/shipping";
import { getBulkDiscountTiers } from "@/lib/bulk-discount";
import { getLocale } from "@/i18n/locale";
import { getDictionary } from "@/i18n/get-dictionary";
import { CheckoutForm, type CheckoutInitialValues } from "./checkout-form";
import { isPackstationSearchConfigured } from "@/lib/dhl-locations";

// Vorausfuellen aus Kundendaten aendert sich pro Nutzer/Anmeldestatus, und
// Versandstaffeln koennen sich im Admin-Bereich jederzeit aendern —
// Rendering pro Request statt statischem Build entkoppelt zudem den
// Docker-Build-Schritt von einer zur Build-Zeit erreichbaren Datenbank.
export const dynamic = "force-dynamic";

export async function generateMetadata(): Promise<Metadata> {
  const t = getDictionary(await getLocale());
  return { title: t.checkoutPage.eyebrow };
}

export default async function CheckoutPage() {
  const [tiers, bulkDiscountTiers] = await Promise.all([getShippingTiers(), getBulkDiscountTiers()]);
  const tierValues = tiers.map((t) => ({
    minQuantity: t.minQuantity,
    maxQuantity: t.maxQuantity,
    priceCents: t.priceCents,
  }));

  const customer = await getCurrentCustomer();
  if (!customer) return <CheckoutForm
    turnstileSiteKey={process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY}
        tiers={tierValues}
        bulkDiscountTiers={bulkDiscountTiers}
        packstationSearchAvailable={isPackstationSearchConfigured()}
      />;

  // getAddressesForCustomer sortiert Standardadresse (isDefault) zuerst, sonst
  // die zuletzt angelegte — die erste Adresse in der Liste ist also immer die
  // sinnvollste Vorbelegung fuer den Checkout.
  const addresses = await getAddressesForCustomer(customer.id);
  const defaultAddress = addresses[0];

  const initialValues: CheckoutInitialValues = {
    firstName: customer.firstName,
    lastName: customer.lastName,
    email: customer.email,
    phone: customer.phone ?? "",
    street: defaultAddress?.street ?? "",
    zip: defaultAddress?.zip ?? "",
    city: defaultAddress?.city ?? "",
  };

  return <CheckoutForm
    turnstileSiteKey={process.env.NEXT_PUBLIC_TURNSTILE_SITE_KEY}
      initialValues={initialValues}
      tiers={tierValues}
      bulkDiscountTiers={bulkDiscountTiers}
      packstationSearchAvailable={isPackstationSearchConfigured()}
    />;
}