Quintus.Audio = function(Q) {
  
    Q.audio = {
      channels: [],
      channelMax:  Q.options.channelMax || 10,
      active: {}
    };
  
    Q.enableSound = function() {
      var hasTouch =  !!('ontouchstart' in window);
  
      if(!hasTouch) {
        Q.audio.enableDesktopSound();
      } else {
        Q.audio.enableMobileSound();
      }
  
      return Q;
    };
  
    // Dummy methods
    Q.play = function() {};
    Q.audioSprites = function() {}
  
    Q.audio.enableDesktopSound = function() {
      for (var i=0;i<Q.audio.channelMax;i++) {        
        Q.audio.channels[i] = {};
        Q.audio.channels[i]['channel'] = new Audio(); 
        Q.audio.channels[i]['finished'] = -1;        
      }
  
      Q.play = function(s,debounce) {
        if(Q.audio.active[s]) return;
        if(debounce) {
          Q.audio.active[s] = true
          setTimeout(function() {
            delete Q.audio.active[s];
          },debounce);
        };
        for (var i=0;i<Q.audio.channels.length;i++) {
          var now = new Date();
          if (Q.audio.channels[i]['finished'] < now.getTime()) {        
            Q.audio.channels[i]['finished'] = now.getTime() + Q.asset(s).duration*1000;
            Q.audio.channels[i]['channel'].src = Q.asset(s).src;
            Q.audio.channels[i]['channel'].load();
            Q.audio.channels[i]['channel'].play();
            break;
          }
        }
      }
    }
  
    Q.audio.enableMobileSound = function() {
      var isiOS = navigator.userAgent.match(/iPad|iPod|iPhone/i) != null;
  
      Q.audioSprites = function(asset) {
        if(_.isString(asset)) asset = Q.asset(asset);
  
        Q.audio.spriteFile = asset['resources'][0].replace(/\.[a-z]+$$/,"");
        Q.audio.sprites = asset['spritemap'];
  
        Q.el.on("touchstart",Q.audio.start);
      }
  
      // Turn off normal sound loading and processing
      Q.options.sound = false;
  
      Q.audio.timer = function() {
        Q.audio.sheet.currentTime = 0;
        Q.audio.sheet.play();
        Q.audio.silenceTimer = setTimeout(Q.audio.timer,500);
      };
  
      Q.audio.start = function() {
        Q.audio.sheet = new Audio();
        Q.audio.sheet.preload = true;
        Q.audio.sheet.addEventListener("canplaythrough", function() {
          Q.audio.sheet.play();
          Q.audio.silenceTimer = setTimeout(Q.audio.timer,500);
        });
  
        var spriteFilename = Q.options.audioPath + Q.audio.spriteFile;
        if(isiOS) {
          Q.audio.sheet.src = spriteFilename + ".caf";
        } else {
          Q.audio.sheet.src = spriteFilename + ".mp3";
        }
        Q.audio.sheet.load();
  
        Q.el.off("touchstart",Q.audio.start);
      };
  
      Q.play = function(sound,debounce) {
        if(!Q.audio.sheet || !Q.audio.silenceTimer) return;
        if(Q.audio.activeSound) return;
        if(debounce) {
          Q.activeSound = true
          setTimeout(function() {
            Q.audio.activeSound = null;
          },debounce);
        }
        sound = sound.replace(/\.[a-z0-9]+/,"");
  
        if(Q.audio.sprites && Q.audio.sprites[sound]) {
  
          var startTime = Q.audio.sprites[sound].start - 0.05,
              endDelay = Q.audio.sprites[sound].end - startTime;
  
          Q.audio.sheet.currentTime = startTime;
          Q.audio.sheet.play();
  
          clearTimeout(Q.audio.silenceTimer);
          Q.audio.silenceTimer = setTimeout(Q.audio.timer,endDelay*1000 + 500);
        }
      };
  
    }
  };