import { LogLevel } from '@nestjs/common';

function parseBool(value: any): boolean {
  if (!value) {
    return false;
  }
  if (value.toLowerCase() === 'true' || value.toLowerCase() === '1') {
    return true;
  }
  if (value.toLowerCase() === 'false' || value.toLowerCase() === '0') {
    return false;
  }

  console.error(
    'parseBool got an unexpected value:',
    value,
    '(accepted values : "true", "false")',
  );
  throw new Error(
    'Error: parseBool got unexpected value - use "true" or "false" values',
  );
}

function flipObject(object) {
  return Object.fromEntries(
    Object.entries(object).map(([key, value]) => [value, key]),
  );
}

function splitAt(str: string, index) {
  const fst = [...str];
  const snd = fst.splice(index);
  return [fst.join(''), snd.join('')];
}

function getLogLevels(debug: boolean): LogLevel[] {
  const enableDebug = process.env.DEBUG != undefined || debug;
  return enableDebug
    ? ['log', 'error', 'warn', 'debug', 'verbose']
    : ['log', 'error', 'warn'];
}

export { flipObject, getLogLevels, parseBool, splitAt };