const fs = require('fs-extra');
const parseString = require('xml2js').parseString;

const baseDir = 'translation/source';
const dbs = ['site', 'arena', 'emails', 'learn', 'activity', 'coordinates', 'study'];

function ucfirst(s) {
  return s.charAt(0).toUpperCase() + s.slice(1);
}

function keyListFrom(name) {
  return fs.readFile(`${baseDir}/${name}.xml`, { encoding: 'utf8' }).then(txt => {
    return new Promise((resolve, reject) => parseString(txt, (_, xml) => {
      const strings = (xml.resources.string || []).map(e => e['$'].name);
      const plurals = (xml.resources.plurals || []).map(e => e['$'].name);
      const keys = strings.concat(plurals);
      resolve({
        name: name,
        code: keys.map(k => 'val `' + k + '` = new Translated("' + k + '", ' + ucfirst(name) + ')').join('\n') + '\n',
      });
    }));
  });
}

Promise.all(dbs.map(keyListFrom)).then(objs => {
  function dbCode(obj) {
    return obj.name === 'site' ?
      obj.code :
      `object ${obj.name} {\n${obj.code}}\n`;
  }
  const code = `// Generated with bin/trans-dump.js
package lila.i18n

import I18nDb.{ ${dbs.map(ucfirst).join(', ')} }

// format: OFF
object I18nKeys {

def untranslated(message: String) = new Untranslated(message)

${objs.map(dbCode).join('\n')}
}
`;

  fs.writeFile('modules/i18n/src/main/I18nKeys.scala', code);
});