'use strict';

const normalizeLevel = require('./common').normalizeLevel;

class Env {
  constructor() {
    this.loggingOff = isLoggingOff();
    this.topPrioLevel = this.loggingOff ? null : getTopPrioLevel();

    this.runsOnXSA = 'XS_BIND_ADDRESS' in process.env;
    this.runsOnCF = 'VCAP_APPLICATION' in process.env && !this.runsOnXSA;
    this.instanceIp = process.env['CF_INSTANCE_IP'];
    this.vcapApp = JSON.parse(process.env['VCAP_APPLICATION'] || '{}');

    this.logUser = isEnabled('XS_LOG_USER');
    this.logReferer = isEnabled('XS_LOG_REFERER');
    this.logConnectionData = isEnabled('XS_LOG_CONNECTION_DATA');
  }
}

function isLoggingOff() {
  return /^none$/i.test(process.env.XS_APP_LOG_LEVEL);
}

function getTopPrioLevel() {
  const value = process.env.XS_APP_LOG_LEVEL;
  if (!value) {
    return null;
  }
  return normalizeLevel(value);
}

function isEnabled(flag) {
  return /^true$/i.test(process.env[flag]);
}

module.exports = Env;