// @open license with citation
// @please feel free to reuse this code for any purpose, citing dougx.net
// @see http://dougx.net/plunder/license.txt for MIT open license text
// ---helpful modifications to this code?
// ---please email your improvements to contact@dougx.net
// ---thank you!
var g_isChr;

function Sound(name, multi, sound_data)
{
   // if ( sound_data[name] == undefined )
   // {
   // 	  log("Can't instantiate sound called: " + name, false);
   // 	  return;
   // }

   if ( multi == undefined || multi < 2 || multi == null)
   {
	  log("Bad instance number request " + name, false);
	  multi = 2;
   }
   this.myName = name;
   this.myInstanceArray = new Array();
   this.myNumInstances = multi;
   this.myLastInstancePlayed = 0;
   this.myInstanceIndex = 0;

   for ( var i = 0; i < this.myNumInstances; ++i )
   {
	  this.myInstanceArray[i] = new Audio();
	  this.myInstanceArray[i].src = sound_data;  // base64 encoded
	  this.myInstanceArray[i].load();
   }
}

//
// Sound member functions
//
Sound.prototype.play = function()
{
   if ( g_isChr)
   {
	  this.playChr();
	  return;
   }

   this.myInstanceArray[this.myInstanceIndex].play();

   this.myInstanceIndex++;
   if ( this.myInstanceIndex >= this.myNumInstances)
   {
	  this.myInstanceIndex = 0;
   }
}

//
// webkit has trouble with very short sound effects (replaying them correctly)
// so we have to re-load each instance after it plays. Chrome will also do
// a hit to the internet if the resource for the sound is a url to an ogg file
// which is why I keep the sound data as base64 encoded text stored in 
// javascript variables.
//
Sound.prototype.playChr= function()
{
   var played = false;
   var loaded = false;

   for ( var i = 0; i < this.myNumInstances; ++i)
   {
 
	  if ( this.myInstanceArray[i].readyState < 1) {
		log('not ready');
		continue;
	}
	  if (( this.myInstanceArray[i].ended == false ) &&
		  ( this.myInstanceArray[i].currentTime == 0 ))
	  {
		 if ( !played )
		 {
			//log(this.myName + " playing instance " + i);
			this.myInstanceArray[i].play();
			this.myLastInstancePlayed = i;
			played = true;
		 }
	  }
   }

   for ( var i = this.myLastInstancePlayed;	 i >= 0; --i)
   {
	  if ( this.myInstanceArray[i].ended == true )
	  {
		 if ( !loaded )
		 {
			this.myInstanceArray[i].load();
			loaded = true;
		 }
	  }
   }

   if (!loaded)
   {
	  for ( var i = this.myNumInstances-1;	i > this.myLastInstancePlayed; --i)
	  {
		 if ( this.myInstanceArray[i].ended == true )
		 {
			if ( !loaded )
			{
			   this.myInstanceArray[i].load();
			   loaded = true;
			}
		 }
	  }
   }

/*
		 log(this.myName + "[" + i + "]" + " ended=" +
			 this.myInstanceArray[i].ended + ". current time = " +
			 this.myInstanceArray[i].currentTime + "<br>", true);


   if ( !played )
   {
	  log(this.myName + " no instance played<br>", true);
	  if ( !loaded )
		 log(this.myName + " no instance loaded<br>", true);
   }
*/
}

function isChr()
{
   if (navigator.userAgent.indexOf('AppleWebKit') != -1)
	  g_isChr= true;
   else
	  g_isChr= false;
}

isChr();