import { defineConfig } from 'astro/config';
import sitemap from '@astrojs/sitemap';

const site = 'https://decodal.hareworks.net';

function alternateLinks(url) {
  const pathname = new URL(url).pathname;
  if (pathname === '/' || pathname === '/ja/') {
    return [
      { url: `${site}/`, lang: 'en' },
      { url: `${site}/ja/`, lang: 'ja' },
      { url: `${site}/`, lang: 'x-default' },
    ];
  }

  const match = pathname.match(/^\/docs\/(en|ja)\/(.*)$/);
  if (!match) return undefined;
  const localizedPath = match[2];
  return [
    { url: `${site}/docs/en/${localizedPath}`, lang: 'en' },
    { url: `${site}/docs/ja/${localizedPath}`, lang: 'ja' },
    { url: `${site}/docs/en/${localizedPath}`, lang: 'x-default' },
  ];
}

export default defineConfig({
  site,
  output: 'static',
  integrations: [
    sitemap({
      filter: (page) => {
        const pathname = new URL(page).pathname;
        return pathname !== '/docs/'
          && pathname !== '/404.html'
          && pathname !== '/404/'
          && !pathname.endsWith('.md')
          && !pathname.endsWith('.txt');
      },
      serialize(item) {
        const links = alternateLinks(item.url);
        return links ? { ...item, links } : item;
      },
    }),
  ],
  build: {
    assets: 'assets',
  },
  vite: {
    resolve: {
      dedupe: [
        '@codemirror/language',
        '@codemirror/state',
        '@codemirror/view',
        '@lezer/highlight',
        '@lezer/lr',
      ],
      preserveSymlinks: true,
    },
  },
});