/**
 * Copyright (c) 2007 - 2009, James Auldridge
 * All rights reserved.
 *
 * Licensed under the BSD License:
 *  http://www.opensource.org/licenses/bsd-license.php
 *
 */
var jaaulde = window.jaaulde || {};
jaaulde.utils = jaaulde.utils || {};
jaaulde.utils.flashsniffer = ( function()
{
	var lastMajorRelease = 10;
	var installed = false;
	var version = null;
	
	( function()
	{
		var fp, fpd, fAX;
		if( navigator.plugins && navigator.plugins.length )
		{
			fp = navigator.plugins['Shockwave Flash'];
			if( fp )
			{
				if( fp.description )
				{
					fpd = fp.description;
					try
					{
						version = fpd.match(/(\d+)\./)[1];
					}
					catch( e1 )
					{
					}

					if( ! isNaN( version ) )
					{
						installed = true;
					}
				}
			}
			else if( navigator.plugins['Shockwave Flash 2.0'] )
			{
				installed = true;
				version = 2;
			}
		}
		else if( navigator.mimeTypes && navigator.mimeTypes.length )
		{
			fp = navigator.mimeTypes['application/x-shockwave-flash'];
			if( fp && fp.enabledPlugin )
			{
				installed = true;
			}
		}
		else
		{
			for( var i = lastMajorRelease; i >= 2; i-- )
			{
				try
				{
					fAX = new ActiveXObject( 'ShockwaveFlash.ShockwaveFlash.' + i );
					installed = true;
					version = i;
					break;
				}
				catch( e2 )
				{
				}
			}
			if( ! installed )
			{
				try
				{
					fAX = new ActiveXObject( 'ShockwaveFlash.ShockwaveFlash' );
					installed = true;
					version = 2;
				}
				catch( e3 )
				{
				}
			}
			//Clean up vars as some of the above could have led to istantiated ActiveXObjects
			fp = null;
			fpd = null;
			fAX = null;
			delete fp;
			delete fpd;
			delete fAX;
		}
	} )();

	//Public Interface
	return {
		/* installed - Determine if Flash is installed
		 * 
		 * @return BOOL true if Flash is installed, false if not
		 */
		installed: function()
		{
			return !! installed;
		},
		/* version - Get version of installed Flash
		 * 
		 * @return INT if Flash is installed and properly detected, else NULL
		 */
		version: function()
		{
			return version;
		},
		/* isLatestVersion - Determine if Flash is installed the latest released version of Flash
		 *                   (as configured in property 'lastMajorRelease' documented above)
		 * 
		 * @return BOOL true if Flash is at latest version, false if not
		 */
		isLatestVersion: function()
		{
			return ( !! installed && version == lastMajorRelease );
		},
		/* isVersion - Determine if Flash is installed at a specified major version
		 * 
		 * @parameter INT exactVersion the exact version for which to check
		 * @return BOOL true if Flash is at specified version, false if not
		 */
		isVersion: function( exactVersion )
		{
			return ( !! installed && version == exactVersion );
		},
		/* meetsMinVersion - Determine if Flash is installed at a specified minimum version
		 * 
		 * @parameter INT minVersion the version number that installed Flash should be at OR above
		 * @return BOOL true if Flash is at minimum version, false if not
		 */
		meetsMinVersion: function( minVersion )
		{
			return ( !! installed && version !== null && version >= minVersion );
		}
	};
} )();