import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';
import { SITE_ORIGIN, DEFAULT_PATH } from '../src/config.js';
import { REGIONS_DATA } from '../src/data/regions.js';
import { TARGETS, SUBJECTS } from '../src/data/subjects.js';

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const publicDir = path.resolve(__dirname, '../public');

function generateUrlXml(urls, today) {
  return `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${urls
  .map(
    (u) => `  <url>
    <loc>${u.loc}</loc>
    <lastmod>${today}</lastmod>
    <changefreq>${u.changefreq}</changefreq>
    <priority>${u.priority}</priority>
  </url>`
  )
  .join('\n')}
</urlset>
`;
}

function generate() {
  const today = new Date().toISOString().split('T')[0];
  const sitemapFiles = [];
  let totalIndexedUrls = 0;

  // 1. 공통 및 메인 대표 랜딩 페이지 사이트맵 (sitemap-main.xml)
  const mainUrls = [
    { loc: `${SITE_ORIGIN}`, priority: '1.0', changefreq: 'daily' },
    { loc: `${SITE_ORIGIN}/regions`, priority: '0.9', changefreq: 'daily' },
    { loc: `${SITE_ORIGIN}${DEFAULT_PATH}`, priority: '1.0', changefreq: 'daily' }
  ];
  const mainXml = generateUrlXml(mainUrls, today);
  fs.writeFileSync(path.join(publicDir, 'sitemap-main.xml'), mainXml, 'utf-8');
  sitemapFiles.push('sitemap-main.xml');
  totalIndexedUrls += mainUrls.length;

  // 2. 17개 시·도별 개별 사이트맵 (sitemap-${sidoSlug}.xml)
  REGIONS_DATA.forEach((sido) => {
    const sidoUrls = [];
    sido.sigunguList.forEach((sigungu) => {
      sigungu.dongList.forEach((dong) => {
        TARGETS.forEach((target) => {
          SUBJECTS.forEach((sub) => {
            sidoUrls.push({
              loc: `${SITE_ORIGIN}/${sido.sidoSlug}/${sigungu.sigunguSlug}/${dong.dongSlug}/${target.slug}/${sub.slug}`,
              priority: '0.8',
              changefreq: 'weekly'
            });
          });
        });
      });
    });

    const fileName = `sitemap-${sido.sidoSlug}.xml`;
    const xml = generateUrlXml(sidoUrls, today);
    fs.writeFileSync(path.join(publicDir, fileName), xml, 'utf-8');
    sitemapFiles.push(fileName);
    totalIndexedUrls += sidoUrls.length;
  });

  // 3. 루트 사이트맵 인덱스 (sitemap.xml - 구글/네이버 단일 제출용 표준)
  const indexXml = `<?xml version="1.0" encoding="UTF-8"?>
<sitemapindex xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${sitemapFiles
  .map(
    (file) => `  <sitemap>
    <loc>${SITE_ORIGIN}/${file}</loc>
    <lastmod>${today}</lastmod>
  </sitemap>`
  )
  .join('\n')}
</sitemapindex>
`;
  fs.writeFileSync(path.join(publicDir, 'sitemap.xml'), indexXml, 'utf-8');

  // 4. robots.txt
  const robots = `User-agent: *
Allow: /
Disallow: /admin
Disallow: /regions/admin

Sitemap: ${SITE_ORIGIN}/sitemap.xml
`;
  fs.writeFileSync(path.join(publicDir, 'robots.txt'), robots, 'utf-8');

  console.log(`[OK] 사이트맵 인덱스(sitemap.xml) 및 ${sitemapFiles.length}개 시·도 분할 사이트맵 생성 완료!`);
  console.log(`[OK] 총 인덱싱 등록 URL: ${totalIndexedUrls.toLocaleString()}개 (${SITE_ORIGIN})`);
}

generate();