const fs = require('fs');
const path = require('path');

function load(localePath) {
  let src = fs.readFileSync(localePath, 'utf8');
  // strip TS type annotations and the const/export lines to a plain object
  // replace "const zh = {" -> "var obj = {", remove "export default zh;"
  src = src.replace(/const\s+\w+\s*=\s*\{/, 'var obj = {');
  src = src.replace(/export\s+default\s+\w+;?/, '');
  src = src.replace(/\bconst\b/g, 'var');
  const moduleWrap = new Function(src + '\nreturn obj;');
  return moduleWrap();
}

function flatten(obj, prefix = '', res = {}) {
  for (const k of Object.keys(obj)) {
    const key = prefix ? prefix + '.' + k : k;
    if (obj[k] && typeof obj[k] === 'object' && !Array.isArray(obj[k])) {
      flatten(obj[k], key, res);
    } else {
      res[key] = obj[k];
    }
  }
  return res;
}

const zhRaw = load('src/locales/zh/index.ts');
const enRaw = load('src/locales/en/index.ts');

const zhF = flatten(zhRaw);
const enF = flatten(enRaw);

const zhKeys = Object.keys(zhF).sort();
const enKeys = Object.keys(enF).sort();

const onlyZh = zhKeys.filter(k => !(k in enF));
const onlyEn = enKeys.filter(k => !(k in zhF));

console.log('=== Keys in ZH but MISSING in EN (' + onlyZh.length + ') ===');
console.log(onlyZh.join('\n'));
console.log('');
console.log('=== Keys in EN but MISSING in ZH (' + onlyEn.length + ') ===');
console.log(onlyEn.join('\n'));
console.log('');
console.log('ZH total keys:', zhKeys.length, ' EN total keys:', enKeys.length);