const { mkdir, writeFile } = require('node:fs/promises');
const { join } = require('node:path');
const { loadPyodide } = require('pyodide');

const packageCacheDir = join(process.cwd(), '.cache', 'pyodide');
const lockFileURL = join(process.cwd(), '.cache', 'pyodide-lock.json');

// file structure setup:
await mkdir(packageCacheDir, { mode: 0o755, recursive: true });
const lockFile = (await import('pyodide/pyodide-lock.json', { with: { type: 'json' } })).default;
await writeFile(lockFileURL, JSON.stringify(lockFile, null, 4), { encoding: 'utf-8', flush: true });

const pyodide = await loadPyodide({ lockFileURL, packageCacheDir });

// install micropip 0.10.1 from PyPi
await pyodide.loadPackage('https://files.pythonhosted.org/packages/6a/79/3dda562c22b4978493adda6a7810f43b513b46cef82cbfd2aef48c3e29e0/micropip-0.10.1-py3-none-any.whl')

const micropip = pyodide.pyimport('micropip');
await micropip.install('simplejson');
// Console output:
//     Loading simplejson
//     Didn't find package simplejson-3.20.1-cp313-cp313-pyodide_2025_0_wasm32.whl locally, attempting to load from https://cdn.jsdelivr.net/pyodide/v0.28.0/full/
//     Package simplejson-3.20.1-cp313-cp313-pyodide_2025_0_wasm32.whl loaded from https://cdn.jsdelivr.net/pyodide/v0.28.0/full/, caching the wheel in node_modules for future use.
//     Loaded simplejson
//
// File <cwd>/.cache/pyodide/simplejson-3.20.1-cp313-cp313-pyodide_2025_0_wasm32.whl was created

JSON.parse(micropip.freeze()).packages.simplejson;
// output:
{
  depends: [],
  file_name: '<cwd>/.cache/simplejson-3.20.1-cp313-cp313-pyodide_2025_0_wasm32.whl',
  imports: [ 'simplejson' ],
  install_dir: 'site',
  name: 'simplejson',
  package_type: 'package',
  sha256: 'c5884ab81866a337e4d797f4f269a9ad26513097d2993d09bc90e80dfa1ccbbe',
  unvendored_tests: true,
  version: '3.20.1'
}