import type { Metadata } from "next";
import { locales, localize, ogLocale, type Locale } from "@/i18n/config";
import type { Page } from "./pages";

/** Canonical URL plus hreflang alternates for a locale-free path. */
export function localeAlternates(path: string, locale: Locale): Metadata["alternates"] {
  return {
    canonical: localize(path, locale),
    languages: {
      ...Object.fromEntries(locales.map((l) => [l, localize(path, l)])),
      "x-default": path,
    },
  };
}

export function pageMetadata(page: Page): Metadata {
  const title = page.meta.title ?? "AI Growth Technologies";
  const description = page.meta.description ?? undefined;
  return {
    title,
    description,
    alternates: localeAlternates(page.path, page.locale),
    openGraph: {
      type: "website",
      url: localize(page.path, page.locale),
      siteName: "AI Growth Technologies",
      locale: ogLocale[page.locale],
      title,
      description,
    },
  };
}