import fs from 'node:fs/promises';
import path from 'node:path';
import vm from 'node:vm';
import { localizeHtml } from '../scripts/localize-html.js';

const root = path.resolve(import.meta.dirname, '..');

export async function loadI18n(context) {
  for (const name of ['texts-de', 'texts-en', 'i18n']) {
    const filename = path.join(root, `public/js/${name}.js`);
    vm.runInNewContext(await fs.readFile(filename, 'utf8'), context, { filename });
  }
  return context.Wegwichtel.I18n;
}

export async function localizedHtml(source) {
  const i18n = await loadI18n({});
  const result = localizeHtml(source, key => i18n.t(key));
  return result.replace(/\sdata-i18n(?:-[\w-]+)?="[^"]*"/g, '');
}

export async function readAppFile(relativePath) {
  const source = await fs.readFile(path.join(root, relativePath), 'utf8');
  if (relativePath === 'public/index.html') return localizedHtml(source);
  return source;
}