const { promisify } = require('util');
const Wemo = require('wemo-client');
const wemo = new Wemo();

const em = require('events').EventEmitter;
const util = require('util');
const logger = require('log4js').getLogger('Wemo');

// const getBinaryStateAsync = promisify(wemo.getBinaryState);

logger.level = 'debug';

const WemoController = function() {
  const _this = this;

  wemo.discover(function(err, deviceInfo) {
    logger.debug('Wemo Device Found: %j', deviceInfo);
    _this.emit('found', deviceInfo);

    // Get the client for the found device
    _this.client = wemo.client(deviceInfo);

    // You definitely want to listen to error events (e.g. device went offline),
    // Node will throw them as an exception if they are left unhandled
    _this.client.on('error', function(err) {
      logger.error('Error: %s', err.code);
    });

    // Handle BinaryState events
    _this.client.on('binaryState', function(value) {
      _this.emit('changeState', value);
      logger.info('Binary State changed to: %s', value);

    });

    // Turn the switch off
    _this.client.setBinaryState(0);
  });

  this.on('newListener', listener => {
    logger.info(`Event Listener: ${ listener}`);
  });

  this.on('wemo-off', function() {
    _this.client.setBinaryState(0);
  });

  this.on('wemo-on', function() {
    _this.client.setBinaryState(1);
  });

  this.on('wemo', function(d) {
    logger.debug('onWemo msg', d);
    if (d === 'FanOn')
      this.emit('wemo-on');
    else
      this.emit('wemo-off');
  });

  return this;
};

util.inherits(WemoController, em);

module.exports = WemoController;