import type { MetadataRoute } from "next";

/**
 * Sitemap for SEO
 *
 * Generates a sitemap.xml for search engine crawlers.
 * Only includes public pages that should be indexed.
 */
export default function sitemap(): MetadataRoute.Sitemap {
  const baseUrl = process.env["NEXT_PUBLIC_SITE_URL"] || "https://portal.asolutions.co.jp";

  // Public pages that should be indexed
  const publicPages = [
    { path: "", priority: 1.0, changeFrequency: "weekly" as const },
    { path: "/about", priority: 0.8, changeFrequency: "monthly" as const },
    { path: "/services", priority: 0.9, changeFrequency: "weekly" as const },
    { path: "/services/internet", priority: 0.8, changeFrequency: "weekly" as const },
    { path: "/services/sim", priority: 0.8, changeFrequency: "weekly" as const },
    { path: "/services/vpn", priority: 0.7, changeFrequency: "monthly" as const },
    { path: "/services/tv", priority: 0.7, changeFrequency: "monthly" as const },
    { path: "/services/onsite", priority: 0.7, changeFrequency: "monthly" as const },
    { path: "/services/business", priority: 0.7, changeFrequency: "monthly" as const },
    { path: "/contact", priority: 0.8, changeFrequency: "monthly" as const },
    { path: "/help", priority: 0.6, changeFrequency: "monthly" as const },
  ];

  return publicPages.map(page => ({
    url: `${baseUrl}${page.path}`,
    lastModified: new Date(),
    changeFrequency: page.changeFrequency,
    priority: page.priority,
  }));
}