var fs = require('fs');
var bunyan = require('bunyan');

function isProd() {
  return process.env.NODE_ENV == 'prod';
}

var mqttUrl = process.env.MQTT_URL || 'mqtt://trygvis.io';

var postgresqlConfig = {
  host: process.env.DB_HOST || '/var/run/postgresql',
  database: process.env.DB_DATABASE || 'diller',
  user: process.env.DB_USER || 'diller',
  password: process.env.DB_PASSWORD || 'diller'
};

var log;

function configureLogging(app) {
  if (log) {
    return;
  }

  var cfg = {
    name: app
  };

  if (isProd()) {
    cfg.streams = [
      {
        level: 'warn',
        stream: process.stdout
      },
      {
        level: 'debug',
        path: 'log/diller-' + app + '.log'
      }
    ];

    var stat;
    try {
      stat = fs.lstatSync('log');
    } catch (e) {
      // Assume this to to be ENOENT
      fs.mkdirSync('log');
    }
    if (stat && !stat.isDirectory()) {
      throw 'Not a directory: log';
    }
  }

  log = bunyan.createLogger(cfg);
}

/**
 * @constructor
 */
function DillerConfig() {
  var httpPort = process.env.HTTP_PORT || 8080;

  /**
   * @lends DillerConfig.prototype
   */
  return {
    isProd: isProd,
    updateDillerRpc: !isProd(),
    mqttUrl: mqttUrl,
    postgresqlConfig: postgresqlConfig,
    httpPort: httpPort,
    configureLogging: configureLogging,
    logQueries: false,
    log: function () {
      return log;
    }
  };
}

module.exports = DillerConfig;