/**
 *	File: app/control.js
 *	Author: Gerrit Linnemann
 *	
 *	Control device.
 */


// load the things we need
var os           = require('os')
,   Log          = require('./logging')
,   childProcess = require('child_process');


var App = null;
var Log = null
var Helper = null;
var Conf = null;

const isWin      = process.platform === "win32";
const isMac      = process.platform === "darwin";
const volumeStep = 10
var volume       = isMac ? 10 : 30;  // starting value in percent


exports.init = function(Express) {
	App = Express;
	Conf = App.get('Configuration');
	Log = App.get('Log');
	Helper = App.get('Helper');
	
	getMacCurrentVolumeInPercent((level) => {
  	volume = level
	})
	
	return this;
}

exports.setValueOnStartup = function() {
  if(isWin) {
  	Log.log('Control: Are you kidding? Windows?');
	} else {
  	setVolumeTo(volume);
	}
}

exports.volumeUp = function() {
  volume = parseInt((volume + volumeStep))
  setVolumeTo(volume)
}

exports.volumeDown = function() {
  volume = parseInt((volume - volumeStep))
  setVolumeTo(volume)
}

exports.volume = function(newValue) {
  setVolumeTo(newValue)
}

function getMacCurrentVolumeInPercent(callback) {
  //osascript -e 'get volume settings'
  //osascript -e 'set ovol to output volume of (get volume settings)'
  
  const cmd = "osascript -e 'set ovol to output volume of (get volume settings)'"
  childProcess.exec(cmd, [], (error, stdout, stderr) => {
    if (error) {
      Log.error('Control: ' + stderr);
      throw error;
    }
    
    Log.log('Control: Sound level ' + stdout);
    callback(stdout);
  });
}

function setVolumeTo(newValue) {
  if(volume > 100) { volume = 100; }
  if(volume < 0) { volume = 0; }
  
  if(isMac) {
  	var tick = Helper.translatePercentVolumeValueToMacScala(volume);
  	Log.log('Control: volume to ' + tick);
  	Helper.shspawn('osascript -e "set volume '+tick+'"');
  } else {
    Log.log('Control: volume to ' + newValue);
    Helper.shspawn('amixer sset \'PCM\' '+newValue+'%');
  }
}