// Point the site at a checkout of the ctao/content repository (default: the
// sibling ../content clone), the same content the live demo builds from.
// src/content/pages and public/uploads become links into that checkout, so
// saves from Sveltia's local-repository mode show up in `npm run dev` directly.
//
//   node scripts/content.mjs         link if missing, then check the pages (pre-hooks)
//   npm run content:link -- [dir]    replace existing links or copies
//
// The deploy build copies the content into place instead (deploy/build.sh);
// existing directories are left alone unless --relink is given.
import { existsSync, lstatSync, mkdirSync, readFileSync, rmSync, symlinkSync, unlinkSync } from 'node:fs';
import { dirname, join, relative, resolve } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = fileURLToPath(new URL('../', import.meta.url));
const examples = JSON.parse(readFileSync(join(root, 'src/data/examples.json'), 'utf8'));
const relink = process.argv.includes('--relink');
const source = resolve(root, process.argv.slice(2).find((arg) => !arg.startsWith('--')) ?? '../content');
const targets = [
  { from: join(source, 'pages'), to: join(root, 'src/content/pages') },
  { from: join(source, 'uploads'), to: join(root, 'public/uploads') },
];

const exists = (path) => {
  try { lstatSync(path); return true; } catch { return false; }
};

for (const { from, to } of targets) {
  if (exists(to) && !relink) continue;
  if (!existsSync(from)) {
    throw new Error(`Missing ${from}. Clone the content repository first:\n` +
      `  git clone https://astro-git.isl-dev.grid.cyfronet.pl/ctao/content.git ${relative(root, source) || '.'}\n` +
      'or pass another checkout: npm run content:link -- <path>');
  }
  if (exists(to)) {
    // Remove only the link itself, never the content it points to.
    if (lstatSync(to).isSymbolicLink()) unlinkSync(to);
    else rmSync(to, { recursive: true }); // an old copied overlay
  }
  mkdirSync(dirname(to), { recursive: true });
  symlinkSync(from, to, 'junction'); // a junction needs no admin rights on Windows
  console.log(`Linked ${relative(root, to)} -> ${from}`);
}

const pages = join(root, 'src/content/pages');
for (const { slug } of examples) {
  if (!existsSync(join(pages, `${slug}.md`))) {
    throw new Error(`Missing ${join(pages, `${slug}.md`)}. Check the content checkout, or run npm run content:link -- <path>.`);
  }
}