/**
 *	File: app/radio.js
 *	Author: Gerrit Linnemann
 *	
 *	Where the magic happens.
 */


// load the things we need
var spawn = require('child_process').spawn;
var exec  = require('child_process').exec;
var fs    = require("fs");
var http  = require('http');
var wget  = require('wget');
var grep  = require('simple-grep');


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

var volume = '40';


exports.init = function(Express, Configuration) {
	App = Express;
	Conf = Configuration;
	Log = App.get('Log');
	Helper = App.get('Helper');
	
	Log.debug('Radio: ' + exports.countChannels() + ' channels configured');
	Helper.each(Conf.channels, function(channel, isLast) {
  	//Log.inspect('Channel', channel);
  	Log.log('Radio: Found channel ' + channel.title);
	});
	
	// set default volume level
	Helper.shspawn('amixer scontrols');
	Helper.shspawn('amixer sset \'PCM\' '+volume+'%');
	
	return this;
}

exports.countChannels = function() {
  return Conf.channels.length;
}

exports.getChannels = function() {
  return Conf.channels;
}

exports.getChannel = function(idx) {
  if(Helper.isDefinedAndNotNull(Conf.channels[idx])) {
    return Conf.channels[idx];
  } else {
    return null;
  }
}

exports.play = function(idx) {
  var channel = Conf.channels[idx];
  if(channel !== undefined) {
    var stream2play = channel.stream;
    var m3u = '/tmp/kitchenradio.m3u';
    
    try {
      fs.unlinkSync(m3u);
    } catch(e) {
      Log.error('Radio: Error deleting "' + m3u + '".' + e);
    }
    
    var download = wget.download(channel.stream, m3u);
    download.on('end', function(output) {
      Log.inspect('Radio: Download completed', output);
      
      Helper.shspawn(App.get('tools_root')+'action.sh stop');
      Helper.shspawn(App.get('tools_root')+'action.sh play');
    });
    
    download.on('error', function(err) {
      Log.error('Radio: Error downloading playlist. ' + err);
    });
  } else {
    Log.error('Radio: No channel defined!');
  }
}

exports.stop = function() {
  Log.log('Radio: stop playing');
  Helper.shspawn(App.get('tools_root')+'action.sh stop');
}

exports.volumeUp = function() {
  exports.volume(5)
}

exports.volumeDown = function() {
  exports.volume(-5)
}

exports.volume = function(step) {
  Log.log('Radio: volume ' + (step>0 ? 'up' : 'down'));
  
  if(step != 0) {
    volume += step;
    
    if(volume > 100) { volume = 100; }
    if(volume < 0) { volume = 0; }
    
    Helper.shspawn('amixer sset \'PCM\' '+volume+'%');
  }
}