import type { MetadataRoute } from 'next';

const BASE_URL = 'https://gooseek.ru';

const ALL_APP_ROUTES = [
  '/discover',
  '/spaces',
  '/history',
  '/travel',
  '/medicine',
  '/finance',
  '/learning',
];

const ALWAYS_IN_SITEMAP = ['/', '/login', '/register'];

function getEnabledAppRoutes(): string[] {
  const raw = process.env.NEXT_PUBLIC_ENABLED_ROUTES || '';
  if (!raw.trim()) return ALL_APP_ROUTES;

  const enabled = new Set(
    raw
      .split(',')
      .map((r) => r.trim())
      .filter((r) => r.startsWith('/')),
  );

  return ALL_APP_ROUTES.filter((r) => enabled.has(r));
}

export default function sitemap(): MetadataRoute.Sitemap {
  const routes = [...ALWAYS_IN_SITEMAP, ...getEnabledAppRoutes()];

  return routes.map((route) => ({
    url: `${BASE_URL}${route}`,
    lastModified: new Date(),
    changeFrequency: route === '/' ? 'daily' : 'weekly',
    priority: route === '/' ? 1.0 : 0.7,
  }));
}