// Stage the marimo notebook exports produced by deploy/export-notebooks.py
// into public/, where Astro will pick them up as static files.
//
// The raw marimo HTML lands at public/nb/<slug>.html (served /nb/<slug>.html)
// and is what the notebook pages iframe. It deliberately does NOT live under
// /notebooks/ — those URLs belong to the Astro pages that wrap it in the
// garden chrome, and with build.format:'file' the two would collide on a
// trailing slash.
//
// No exports (export script never ran, or nothing is marked) is a normal
// state, not an error: the notebooks section simply doesn't render.
import fs from 'node:fs';
import path from 'node:path';
import { fileURLToPath } from 'node:url';

const REPO = path.join(path.dirname(fileURLToPath(import.meta.url)), '..');
const SRC_DIR = path.join(REPO, 'notebooks-export');
const OUT_DIR = path.join(REPO, 'public', 'nb');

fs.rmSync(OUT_DIR, { recursive: true, force: true });

let index = [];
try {
  index = JSON.parse(fs.readFileSync(path.join(SRC_DIR, 'index.json'), 'utf8'));
} catch {
  console.log('copy-notebooks: no notebooks-export/index.json — nothing to stage');
  process.exit(0);
}

fs.mkdirSync(OUT_DIR, { recursive: true });

let copied = 0;
for (const nb of index) {
  const src = path.join(SRC_DIR, `${nb.slug}.html`);
  if (!fs.existsSync(src)) {
    // export-notebooks.py only indexes notebooks it exported, so this means
    // the two got out of sync — warn rather than ship a link to a 404
    console.warn(`copy-notebooks: MISSING export for indexed notebook ${nb.slug}`);
    continue;
  }
  fs.copyFileSync(src, path.join(OUT_DIR, `${nb.slug}.html`));
  copied++;
}

console.log(`copy-notebooks: ${copied}/${index.length} staged -> ${OUT_DIR}`);