import type { Metadata } from "next";
import { getDictionary, type Locale } from "@/lib/i18n";
import { getLocalizedPath, getLocalizedUrl, getModeValue } from "@/lib/site";

type PageKey = "home" | "about" | "contact";

const pagePathMap: Record<PageKey, string> = {
  home: "",
  about: "/about",
  contact: "/contact",
};

export function buildPageMetadata(locale: Locale, page: PageKey): Metadata {
  const dictionary = getDictionary(locale);
  const pathname = pagePathMap[page];
  const homeMetadata = getModeValue(dictionary.metadata.home);
  const metadataByPage = {
    home: {
      title: homeMetadata.title,
      description: homeMetadata.description,
    },
    about: {
      title: dictionary.metadata.aboutTitle,
      description: dictionary.metadata.aboutDescription,
    },
    contact: {
      title: dictionary.metadata.contactTitle,
      description: dictionary.metadata.contactDescription,
    },
  } as const;

  const pageMetadata = metadataByPage[page];
  const canonicalPath = getLocalizedPath(pathname, locale);

  return {
    title: pageMetadata.title,
    description: pageMetadata.description,
    alternates: {
      canonical: canonicalPath,
      languages: {
        ar: getLocalizedPath(pathname, "ar"),
        en: getLocalizedPath(pathname, "en"),
        "x-default": getLocalizedPath(pathname, "ar"),
      },
    },
    openGraph: {
      title: pageMetadata.title,
      description: pageMetadata.description,
      url: getLocalizedUrl(pathname, locale),
      siteName: dictionary.common.siteTitle,
      locale: locale === "ar" ? "ar_SA" : "en_US",
      type: "website",
    },
    twitter: {
      card: "summary_large_image",
      title: pageMetadata.title,
      description: pageMetadata.description,
    },
  };
}