#!/usr/bin/env node
import fs from 'node:fs/promises';
import path from 'node:path';
import { fileURLToPath, pathToFileURL } from 'node:url';
import {
  extractSharePreviewMeta,
  injectOgTags,
  renderWechatSharePreviewHtml,
} from '../mindspace-og-tags.mjs';

const root = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');

async function loadHtmlSource(input) {
  if (/^https?:\/\//i.test(input)) {
    const res = await fetch(input);
    if (!res.ok) throw new Error(`HTTP ${res.status} for ${input}`);
    return { html: await res.text(), pageUrl: input.split('#')[0] };
  }
  const filePath = path.resolve(process.cwd(), input);
  const html = await fs.readFile(filePath, 'utf8');
  const pageUrl = pathToFileURL(filePath).toString();
  return { html, pageUrl };
}

async function main() {
  const input = process.argv[2];
  const origin = (process.argv[3] || 'https://m.tkmind.cn').replace(/\/$/, '');
  if (!input) {
    console.error('用法: node scripts/wechat-share-preview.mjs <页面路径或URL> [origin]');
    process.exit(1);
  }

  const { html: rawHtml, pageUrl } = await loadHtmlSource(input);
  const pageDirUrl = pageUrl.includes('/')
    ? `${pageUrl.slice(0, pageUrl.lastIndexOf('/') + 1)}`
    : `${origin}/`;
  const html = injectOgTags(rawHtml, { origin, pageUrl, pageDirUrl });
  const preview = extractSharePreviewMeta(html, { origin, pageUrl, pageDirUrl });
  const outDir = path.join(root, 'public', 'dev');
  await fs.mkdir(outDir, { recursive: true });
  const outPath = path.join(outDir, 'wechat-share-preview.generated.html');
  await fs.writeFile(
    outPath,
    renderWechatSharePreviewHtml(preview, {
      note: '由 scripts/wechat-share-preview.mjs 生成，可离线查看卡片布局。',
    }),
    'utf8',
  );
  console.log(`预览已写入 ${outPath}`);
  console.log(`title: ${preview.title}`);
  console.log(`description: ${preview.description}`);
  console.log(`site: ${preview.siteName}`);
  console.log(`image: ${preview.imageUrl || '(none)'}`);
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});