import { MetadataRoute } from "next";
import { LOCALES, LOCALE_HTML_LANG, DEFAULT_LOCALE } from "@/i18n";
import { getAllSegmentSlugs } from "@/data/segments";

const SITE_URL = "https://myinfomate.be";

function alternates(buildPath: (locale: string) => string) {
  const languages: Record<string, string> = {};
  for (const l of LOCALES) {
    languages[LOCALE_HTML_LANG[l]] = `${SITE_URL}${buildPath(l)}`;
  }
  languages["x-default"] = `${SITE_URL}${buildPath(DEFAULT_LOCALE)}`;
  return languages;
}

export default function sitemap(): MetadataRoute.Sitemap {
  const now = new Date();
  const entries: MetadataRoute.Sitemap = [];

  for (const lang of LOCALES) {
    entries.push({
      url: `${SITE_URL}/${lang}`,
      lastModified: now,
      changeFrequency: "monthly",
      priority: lang === DEFAULT_LOCALE ? 1 : 0.9,
      alternates: { languages: alternates((l) => `/${l}`) },
    });
  }

  for (const slug of getAllSegmentSlugs()) {
    for (const lang of LOCALES) {
      entries.push({
        url: `${SITE_URL}/${lang}/${slug}`,
        lastModified: now,
        changeFrequency: "monthly",
        priority: 0.8,
        alternates: { languages: alternates((l) => `/${l}/${slug}`) },
      });
    }
  }

  entries.push(
    {
      url: `${SITE_URL}/mentions-legales`,
      lastModified: now,
      changeFrequency: "yearly",
      priority: 0.3,
    },
    {
      url: `${SITE_URL}/confidentialite`,
      lastModified: now,
      changeFrequency: "yearly",
      priority: 0.3,
    }
  );

  return entries;
}