import type { Metadata } from "next";

import { routing } from "@/i18n/routing";
import { AppLocale, getLocalizedPath, resolveLocale } from "@/lib/locale";

function getSiteUrl(): URL {
  return new URL(process.env.NEXT_PUBLIC_SITE_URL ?? "https://mohfarawati.de");
}

function toAbsoluteUrl(pathname: string): string {
  return new URL(pathname, getSiteUrl()).toString();
}

export function buildLocaleAlternates(pathname: string) {
  const languages = Object.fromEntries(
    routing.locales.map((locale) => [locale, toAbsoluteUrl(getLocalizedPath(locale, pathname))]),
  ) as Record<AppLocale, string>;

  return {
    canonical: toAbsoluteUrl(getLocalizedPath(routing.defaultLocale, pathname)),
    languages: {
      ...languages,
      "x-default": toAbsoluteUrl(getLocalizedPath(routing.defaultLocale, pathname)),
    },
  };
}

type LocalizedMetadataInput = {
  locale: string;
  pathname: string;
  title: string;
  description: string;
};

export function buildLocalizedMetadata({
  locale,
  pathname,
  title,
  description,
}: LocalizedMetadataInput): Metadata {
  const localeKey = resolveLocale(locale);

  return {
    title,
    description,
    alternates: buildLocaleAlternates(pathname),
    openGraph: {
      title,
      description,
      url: toAbsoluteUrl(getLocalizedPath(localeKey, pathname)),
      siteName: "moh-sass",
      locale: localeKey,
      type: "website",
    },
  };
}