/*------------------------------------------------------------------------------
 MobileTemplateSwitcher - plugin for MODx (tested for versions: 0.9.6.3, 1.0.0)
	This version does not work on MODx Revolution 2.0
--------------------------------------------------------------------------------
Version 1.4.1 amendment by Noah Learner

Code based on plugin originally posted by Peter Hoeflehner
http://modxcms.com/extras/package/?package=557
Inspiration from this forum thread:
http://modxcms.com/forums/index.php/topic,40357.0.html

1.4 Author: Everett Griffiths
everett@fireproofsocks.com
www.fireproofsocks.com
released to the Public Domain.

DESCRIPTION:
This plugin combines browser detection and a URL-parameter override to 
show/hide portions of any template delineated by <mobile> and <standard> tags. 

REQUIREMENTS and EXAMPLES:
For this to have any effect, you must delineate one or more portions of your 
template(s) with <mobile> and <standard> tags, e.g. 

Template Example A:
<html>
	<head>
		<title>[*pagetitle*]</title>
		<meta name=description content="[*description*]" />
		<mobile>
			<link type="text/css" rel="stylesheet" href="mobile.css" />
		</mobile>
		<standard>
			<link type="text/css" rel="stylesheet" href="standard_one.css" />
			<link type="text/css" rel="stylesheet" href="standard_two.css" />
			<script type="text/javascript" src="menu.js"></script>
		</standard>
	</head>
<mobile>
	<body class="narrow">
</mobile>	
<standard>
	<body class="huge">
</standard>

	[*content*]
	</body>
</html>

OR

Template Example B:
<mobile>{{my_mobile_template}}</mobile>
<standard>{{my_standard_template}}</standard>


INSTALLATION:
1. Login to your MODx manager, create a new Plugin
2. Copy and paste the contents of this file into the "plugin code" text box.
3. Before saving the plugin, go to the plugin configuration tab; paste 
   the following text into the "Plugin configuration:" text box:

&usecookie=Use Cookie;list;yes,no;yes &url_param=URL Override Parameter (GET);text;browser &mobile_node=Mobile Node ID;text;mobile &standard_node=Standard Node ID;text;standard &force_browser_detect=Force Browser Detect;text;detect &iphone=iPhone is mobile?;list;1,0;1 &ipad=iPad is mobile?;list;1,0;0 &android=Android?;list;1,0;1 &opera=Opera Mini?;list;1,0;1 &blackberry=Blackberry?;list;1,0;1 &palm=Palm?;list;1,0;1 &windows=Windows Mobile?;list;1,0;1

4. Next, head over to the "System Events" tab and check the following event(s):
	* OnWebPagePrerender
5. Save the Plugin.

USAGE:
Without modifications, the user's browser is detected *once* and a cookie is set
to store the value; if a mobile browser is detected, <standard> portions of 
the template will be deleted, leaving only <mobile> portions.
URL parameters can override the results of the browser detection, e.g.:

	http://www.yoursite.com/some/page?browser=mobile

	http://www.yoursite.com/some/page?browser=standard

	http://www.yoursite.com/some/page?browser=detect

"browser=mobile" will cause all portions of the template wrapped with <standard>
tags to be deleted. 
"browser=standard" will cause all <mobile> nodes to be deleted. 
"browser=detect" triggers browser detection and clears the cookie.  Whatever the 
result of browser detection will cause the respective nodes to be preserved.


CONFIGURATION:

Use Cookie?  default is yes. Normal use (i.e. use cookie = yes) is that browser 
detection is run only ONCE per visitor, and the result is stored in the cookie.
If the user chooses to override the template, this can be done via the URLs, e.g.
mydomain.com/?browser=mobile
If cookies are disabled, then the browser detection is run for each page request
for each user.

URL Parameter: The name of the parameter that will trigger the overrides, e.g.
if this is set to 'x', then 	http://www.yoursite.com/some/page?x=mobile
will trigger the mobile template to be used.

Mobile node: default mobile.  This affects your template code, e.g. 
<mobile></mobile> AND it affects the browser override, e.g. 
www.yoursite.com?browser=mobile

Standard node: default standard. This affects your template code, e.g. 
<standard></standard> AND it affects the browser override, e.g. 
www.yoursite.com?browser=standard

Browser Detect: default detect.  This string identifies how you can force the 
user's browser to be detected.  E.g. www.yoursite.com?browser=detect

The following variables are from the script available at 
http://detectmobilebrowsers.mobi/
Some of its settings have been exposed for easy configuration within MODx.

The function is_mobile_device has nine parameters that can be passed to it which define the way it handles different scenarios. These paramaters are:
* iPad - Set to true to treat iPads as mobiles, false to treat them like full browsers or set a URL (including http://) to redirect iPads to.
* iPhone - Set to true to treat iPhones as mobiles, false to treat them like full browsers or set a URL (including http://) to redirect iPhones and iPods to.
* Android - Set to true to treat Android handsets as mobiles, false to treat them like full browsers or set a URL (including http://) to redirect Android and Google mobile users to.
* Opera Mini - Set to true to treat Opera Mini like a mobile, false to treat it like full browser or set a URL (including http://) to redirect Opera Mini users to.
* Blackberry - Set to true to treat Blackberry like a mobile, false to treat it like full browser or set a URL (including http://) to redirect Blackberry users to.
* Palm - Set to true to treat Palm OS like a mobile, false to treat it like full browser or set a URL (including http://) to redirect Palm OS users to.
* Windows - Set to true to treat Windows Mobiles like a mobile, false to treat it like full browser or set a URL (including http://) to redirect Windows Mobile users to.
* Mobile Redirect URL - This should be full web address (including http://) of the site (or page) you want to send mobile visitors to. Leaving this blank will make the script return true when it detects a mobile.
* Desktop Redirect URL - This should be full web address (including http://) of the site (or page) you want to send non-mobile visitors to. Leaving this blank will make the script return false when it fails to detect a mobile.
------------------------------------------------------------------------------*/
function is_mobile_device($ipad=false,$iphone=true,$android=true,$opera=true,$blackberry=true,$palm=true,$windows=true,$mobileredirect=false,$desktopredirect=false){

	$mobile_browser   = false; // set mobile browser as false till we can prove otherwise
	$user_agent       = $_SERVER['HTTP_USER_AGENT']; // get the user agent value - this should be cleaned to ensure no nefarious input gets executed
	$accept           = $_SERVER['HTTP_ACCEPT']; // get the content accept value - this should be cleaned to ensure no nefarious input gets executed

	switch(true){ // using a switch against the following statements which could return true is more efficient than the previous method of using if statements
 
 //Below is new section added for iPad configurability  ******************
//************** 
case (eregi('iPad',$user_agent)); // we find the word ipad in the user agent
      $mobile_browser = $ipad; // mobile browser is either true or false depending on the setting of ipad when calling the function
      $status = 'Apple iPad';
      if(substr($ipad,0,4)=='http'){ // does the value of ipad resemble a url
        $mobileredirect = $ipad; // set the mobile redirect url to the url value stored in the ipad value
      } // ends the if for ipad being a url
    break; // break out and skip the rest if we've had a match on the ipad // this goes before the iphone to catch it else it would return on the iphone instead
		
                
                
                case (eregi('ipod',$user_agent)||eregi('iphone',$user_agent)); // we find the words iphone or ipod in the user agent
			$mobile_browser = $iphone; // mobile browser is either true or false depending on the setting of iphone when calling the function
			if(substr($iphone,0,4)=='http'){ // does the value of iphone resemble a url
				$mobileredirect = $iphone; // set the mobile redirect url to the url value stored in the iphone value
			} // ends the if for iphone being a url
		break; // break out and skip the rest if we've had a match on the iphone or ipod

		case (eregi('android',$user_agent));	// we find android in the user agent
			$mobile_browser = $android; // mobile browser is either true or false depending on the setting of android when calling the function
			if(substr($android,0,4)=='http'){ // does the value of android resemble a url
				$mobileredirect = $android; // set the mobile redirect url to the url value stored in the android value
			} // ends the if for android being a url
		break; // break out and skip the rest if we've had a match on android

		case (eregi('opera mini',$user_agent)); // we find opera mini in the user agent
			$mobile_browser = $opera; // mobile browser is either true or false depending on the setting of opera when calling the function
			if(substr($opera,0,4)=='http'){ // does the value of opera resemble a rul
				$mobileredirect = $opera; // set the mobile redirect url to the url value stored in the opera value
			} // ends the if for opera being a url 
		break; // break out and skip the rest if we've had a match on opera

		case (eregi('blackberry',$user_agent)); // we find blackberry in the user agent
			$mobile_browser = $blackberry; // mobile browser is either true or false depending on the setting of blackberry when calling the function
			if(substr($blackberry,0,4)=='http'){ // does the value of blackberry resemble a rul
				$mobileredirect = $blackberry; // set the mobile redirect url to the url value stored in the blackberry value
			} // ends the if for blackberry being a url 
		break; // break out and skip the rest if we've had a match on blackberry

		case (preg_match('/(palm os|palm|hiptop|avantgo|plucker|xiino|blazer|elaine)/i',$user_agent)); // we find palm os in the user agent - the i at the end makes it case insensitive
			$mobile_browser = $palm; // mobile browser is either true or false depending on the setting of palm when calling the function
			if(substr($palm,0,4)=='http'){ // does the value of palm resemble a rul
				$mobileredirect = $palm; // set the mobile redirect url to the url value stored in the palm value
			} // ends the if for palm being a url 
		break; // break out and skip the rest if we've had a match on palm os

		case (preg_match('/(windows ce; ppc;|windows ce; smartphone;|windows ce; iemobile)/i',$user_agent)); // we find windows mobile in the user agent - the i at the end makes it case insensitive
			$mobile_browser = $windows; // mobile browser is either true or false depending on the setting of windows when calling the function
			if(substr($windows,0,4)=='http'){ // does the value of windows resemble a rul
				$mobileredirect = $windows; // set the mobile redirect url to the url value stored in the windows value
			} // ends the if for windows being a url 
		break; // break out and skip the rest if we've had a match on windows

		case (preg_match('/(up.browser|up.link|mmp|symbian|smartphone|midp|wap|vodafone|o2|pocket|kindle|mobile|pda|psp|treo)/i',$user_agent)); // check if any of the values listed create a match on the user agent - these are some of the most common terms used in agents to identify them as being mobile devices - the i at the end makes it case insensitive
			$mobile_browser = true; // set mobile browser to true
		break; // break out and skip the rest if we've preg_match on the user agent returned true 

		case ((strpos($accept,'text/vnd.wap.wml')>0)||(strpos($accept,'application/vnd.wap.xhtml+xml')>0)); // is the device showing signs of support for text/vnd.wap.wml or application/vnd.wap.xhtml+xml
			$mobile_browser = true; // set mobile browser to true
		break; // break out and skip the rest if we've had a match on the content accept headers

		case (isset($_SERVER['HTTP_X_WAP_PROFILE'])||isset($_SERVER['HTTP_PROFILE'])); // is the device giving us a HTTP_X_WAP_PROFILE or HTTP_PROFILE header - only mobile devices would do this
			$mobile_browser = true; // set mobile browser to true
		break; // break out and skip the final step if we've had a return true on the mobile specfic headers

		case (in_array(strtolower(substr($user_agent,0,4)),array('1207'=>'1207','3gso'=>'3gso','4thp'=>'4thp','501i'=>'501i','502i'=>'502i','503i'=>'503i','504i'=>'504i','505i'=>'505i','506i'=>'506i','6310'=>'6310','6590'=>'6590','770s'=>'770s','802s'=>'802s','a wa'=>'a wa','acer'=>'acer','acs-'=>'acs-','airn'=>'airn','alav'=>'alav','asus'=>'asus','attw'=>'attw','au-m'=>'au-m','aur '=>'aur ','aus '=>'aus ','abac'=>'abac','acoo'=>'acoo','aiko'=>'aiko','alco'=>'alco','alca'=>'alca','amoi'=>'amoi','anex'=>'anex','anny'=>'anny','anyw'=>'anyw','aptu'=>'aptu','arch'=>'arch','argo'=>'argo','bell'=>'bell','bird'=>'bird','bw-n'=>'bw-n','bw-u'=>'bw-u','beck'=>'beck','benq'=>'benq','bilb'=>'bilb','blac'=>'blac','c55/'=>'c55/','cdm-'=>'cdm-','chtm'=>'chtm','capi'=>'capi','comp'=>'comp','cond'=>'cond','craw'=>'craw','dall'=>'dall','dbte'=>'dbte','dc-s'=>'dc-s','dica'=>'dica','ds-d'=>'ds-d','ds12'=>'ds12','dait'=>'dait','devi'=>'devi','dmob'=>'dmob','doco'=>'doco','dopo'=>'dopo','el49'=>'el49','erk0'=>'erk0','esl8'=>'esl8','ez40'=>'ez40','ez60'=>'ez60','ez70'=>'ez70','ezos'=>'ezos','ezze'=>'ezze','elai'=>'elai','emul'=>'emul','eric'=>'eric','ezwa'=>'ezwa','fake'=>'fake','fly-'=>'fly-','fly_'=>'fly_','g-mo'=>'g-mo','g1 u'=>'g1 u','g560'=>'g560','gf-5'=>'gf-5','grun'=>'grun','gene'=>'gene','go.w'=>'go.w','good'=>'good','grad'=>'grad','hcit'=>'hcit','hd-m'=>'hd-m','hd-p'=>'hd-p','hd-t'=>'hd-t','hei-'=>'hei-','hp i'=>'hp i','hpip'=>'hpip','hs-c'=>'hs-c','htc '=>'htc ','htc-'=>'htc-','htca'=>'htca','htcg'=>'htcg','htcp'=>'htcp','htcs'=>'htcs','htct'=>'htct','htc_'=>'htc_','haie'=>'haie','hita'=>'hita','huaw'=>'huaw','hutc'=>'hutc','i-20'=>'i-20','i-go'=>'i-go','i-ma'=>'i-ma','i230'=>'i230','iac'=>'iac','iac-'=>'iac-','iac/'=>'iac/','ig01'=>'ig01','im1k'=>'im1k','inno'=>'inno','iris'=>'iris','jata'=>'jata','java'=>'java','kddi'=>'kddi','kgt'=>'kgt','kgt/'=>'kgt/','kpt '=>'kpt ','kwc-'=>'kwc-','klon'=>'klon','lexi'=>'lexi','lg g'=>'lg g','lg-a'=>'lg-a','lg-b'=>'lg-b','lg-c'=>'lg-c','lg-d'=>'lg-d','lg-f'=>'lg-f','lg-g'=>'lg-g','lg-k'=>'lg-k','lg-l'=>'lg-l','lg-m'=>'lg-m','lg-o'=>'lg-o','lg-p'=>'lg-p','lg-s'=>'lg-s','lg-t'=>'lg-t','lg-u'=>'lg-u','lg-w'=>'lg-w','lg/k'=>'lg/k','lg/l'=>'lg/l','lg/u'=>'lg/u','lg50'=>'lg50','lg54'=>'lg54','lge-'=>'lge-','lge/'=>'lge/','lynx'=>'lynx','leno'=>'leno','m1-w'=>'m1-w','m3ga'=>'m3ga','m50/'=>'m50/','maui'=>'maui','mc01'=>'mc01','mc21'=>'mc21','mcca'=>'mcca','medi'=>'medi','meri'=>'meri','mio8'=>'mio8','mioa'=>'mioa','mo01'=>'mo01','mo02'=>'mo02','mode'=>'mode','modo'=>'modo','mot '=>'mot ','mot-'=>'mot-','mt50'=>'mt50','mtp1'=>'mtp1','mtv '=>'mtv ','mate'=>'mate','maxo'=>'maxo','merc'=>'merc','mits'=>'mits','mobi'=>'mobi','motv'=>'motv','mozz'=>'mozz','n100'=>'n100','n101'=>'n101','n102'=>'n102','n202'=>'n202','n203'=>'n203','n300'=>'n300','n302'=>'n302','n500'=>'n500','n502'=>'n502','n505'=>'n505','n700'=>'n700','n701'=>'n701','n710'=>'n710','nec-'=>'nec-','nem-'=>'nem-','newg'=>'newg','neon'=>'neon','netf'=>'netf','noki'=>'noki','nzph'=>'nzph','o2 x'=>'o2 x','o2-x'=>'o2-x','opwv'=>'opwv','owg1'=>'owg1','opti'=>'opti','oran'=>'oran','p800'=>'p800','pand'=>'pand','pg-1'=>'pg-1','pg-2'=>'pg-2','pg-3'=>'pg-3','pg-6'=>'pg-6','pg-8'=>'pg-8','pg-c'=>'pg-c','pg13'=>'pg13','phil'=>'phil','pn-2'=>'pn-2','pt-g'=>'pt-g','palm'=>'palm','pana'=>'pana','pire'=>'pire','pock'=>'pock','pose'=>'pose','psio'=>'psio','qa-a'=>'qa-a','qc-2'=>'qc-2','qc-3'=>'qc-3','qc-5'=>'qc-5','qc-7'=>'qc-7','qc07'=>'qc07','qc12'=>'qc12','qc21'=>'qc21','qc32'=>'qc32','qc60'=>'qc60','qci-'=>'qci-','qwap'=>'qwap','qtek'=>'qtek','r380'=>'r380','r600'=>'r600','raks'=>'raks','rim9'=>'rim9','rove'=>'rove','s55/'=>'s55/','sage'=>'sage','sams'=>'sams','sc01'=>'sc01','sch-'=>'sch-','scp-'=>'scp-','sdk/'=>'sdk/','se47'=>'se47','sec-'=>'sec-','sec0'=>'sec0','sec1'=>'sec1','semc'=>'semc','sgh-'=>'sgh-','shar'=>'shar','sie-'=>'sie-','sk-0'=>'sk-0','sl45'=>'sl45','slid'=>'slid','smb3'=>'smb3','smt5'=>'smt5','sp01'=>'sp01','sph-'=>'sph-','spv '=>'spv ','spv-'=>'spv-','sy01'=>'sy01','samm'=>'samm','sany'=>'sany','sava'=>'sava','scoo'=>'scoo','send'=>'send','siem'=>'siem','smar'=>'smar','smit'=>'smit','soft'=>'soft','sony'=>'sony','t-mo'=>'t-mo','t218'=>'t218','t250'=>'t250','t600'=>'t600','t610'=>'t610','t618'=>'t618','tcl-'=>'tcl-','tdg-'=>'tdg-','telm'=>'telm','tim-'=>'tim-','ts70'=>'ts70','tsm-'=>'tsm-','tsm3'=>'tsm3','tsm5'=>'tsm5','tx-9'=>'tx-9','tagt'=>'tagt','talk'=>'talk','teli'=>'teli','topl'=>'topl','tosh'=>'tosh','up.b'=>'up.b','upg1'=>'upg1','utst'=>'utst','v400'=>'v400','v750'=>'v750','veri'=>'veri','vk-v'=>'vk-v','vk40'=>'vk40','vk50'=>'vk50','vk52'=>'vk52','vk53'=>'vk53','vm40'=>'vm40','vx98'=>'vx98','virg'=>'virg','vite'=>'vite','voda'=>'voda','vulc'=>'vulc','w3c '=>'w3c ','w3c-'=>'w3c-','wapj'=>'wapj','wapp'=>'wapp','wapu'=>'wapu','wapm'=>'wapm','wig '=>'wig ','wapi'=>'wapi','wapr'=>'wapr','wapv'=>'wapv','wapy'=>'wapy','wapa'=>'wapa','waps'=>'waps','wapt'=>'wapt','winc'=>'winc','winw'=>'winw','wonu'=>'wonu','x700'=>'x700','xda2'=>'xda2','xdag'=>'xdag','yas-'=>'yas-','your'=>'your','zte-'=>'zte-','zeto'=>'zeto','acs-'=>'acs-','alav'=>'alav','alca'=>'alca','amoi'=>'amoi','aste'=>'aste','audi'=>'audi','avan'=>'avan','benq'=>'benq','bird'=>'bird','blac'=>'blac','blaz'=>'blaz','brew'=>'brew','brvw'=>'brvw','bumb'=>'bumb','ccwa'=>'ccwa','cell'=>'cell','cldc'=>'cldc','cmd-'=>'cmd-','dang'=>'dang','doco'=>'doco','eml2'=>'eml2','eric'=>'eric','fetc'=>'fetc','hipt'=>'hipt','http'=>'http','ibro'=>'ibro','idea'=>'idea','ikom'=>'ikom','inno'=>'inno','ipaq'=>'ipaq','jbro'=>'jbro','jemu'=>'jemu','java'=>'java','jigs'=>'jigs','kddi'=>'kddi','keji'=>'keji','kyoc'=>'kyoc','kyok'=>'kyok','leno'=>'leno','lg-c'=>'lg-c','lg-d'=>'lg-d','lg-g'=>'lg-g','lge-'=>'lge-','libw'=>'libw','m-cr'=>'m-cr','maui'=>'maui','maxo'=>'maxo','midp'=>'midp','mits'=>'mits','mmef'=>'mmef','mobi'=>'mobi','mot-'=>'mot-','moto'=>'moto','mwbp'=>'mwbp','mywa'=>'mywa','nec-'=>'nec-','newt'=>'newt','nok6'=>'nok6','noki'=>'noki','o2im'=>'o2im','opwv'=>'opwv','palm'=>'palm','pana'=>'pana','pant'=>'pant','pdxg'=>'pdxg','phil'=>'phil','play'=>'play','pluc'=>'pluc','port'=>'port','prox'=>'prox','qtek'=>'qtek','qwap'=>'qwap','rozo'=>'rozo','sage'=>'sage','sama'=>'sama','sams'=>'sams','sany'=>'sany','sch-'=>'sch-','sec-'=>'sec-','send'=>'send','seri'=>'seri','sgh-'=>'sgh-','shar'=>'shar','sie-'=>'sie-','siem'=>'siem','smal'=>'smal','smar'=>'smar','sony'=>'sony','sph-'=>'sph-','symb'=>'symb','t-mo'=>'t-mo','teli'=>'teli','tim-'=>'tim-','tosh'=>'tosh','treo'=>'treo','tsm-'=>'tsm-','upg1'=>'upg1','upsi'=>'upsi','vk-v'=>'vk-v','voda'=>'voda','vx52'=>'vx52','vx53'=>'vx53','vx60'=>'vx60','vx61'=>'vx61','vx70'=>'vx70','vx80'=>'vx80','vx81'=>'vx81','vx83'=>'vx83','vx85'=>'vx85','wap-'=>'wap-','wapa'=>'wapa','wapi'=>'wapi','wapp'=>'wapp','wapr'=>'wapr','webc'=>'webc','whit'=>'whit','winw'=>'winw','wmlb'=>'wmlb','xda-'=>'xda-',))); // check against a list of trimmed user agents to see if we find a match
			$mobile_browser = true; // set mobile browser to true
		break; // break even though it's the last statement in the switch so there's nothing to break away from but it seems better to include it than exclude it

	} // ends the switch 

	// tell adaptation services (transcoders and proxies) to not alter the content based on user agent as it's already being managed by this script
	header('Cache-Control: no-transform'); // http://mobiforge.com/developing/story/setting-http-headers-advise-transcoding-proxies
	header('Vary: User-Agent, Accept'); // http://mobiforge.com/developing/story/setting-http-headers-advise-transcoding-proxies

	// if redirect (either the value of the mobile or desktop redirect depending on the value of $mobile_browser) is true redirect else we return the status of $mobile_browser
	if($redirect = ($mobile_browser==true) ? $mobileredirect : $desktopredirect){
		header('Location: '.$redirect); // redirect to the right url for this device
		exit;
	}else{ 
		return $mobile_browser; // will return either true or false 
	}

} // ends function is_mobile_device
/*------------------ OTHER FUNCTIONS------------------------------------------*/
function store_user_prefs($x, $usecookie) {
	if ($usecookie == 'yes') {
		setcookie('browser',$x,time()+604800, "/", "", 0);
	}
}
//-------------------------------------
function get_user_prefs() {
	return $_COOKIE['browser'];
}
//-------------------------------------
function clear_user_prefs() {
	if ($usecookie == 'yes') {
		setcookie('browser','',time()-3600, "/", "", 0);
	}
}
//-------------------------------------
function delete_template_nodes($delete_node,$preserve_node) {
	global $modx; // Without this, the $modx var is out of scope.
	$delete_node = preg_quote($delete_node);
	$pattern = '/\<'.$delete_node.'\>(.*)\<\/'.$delete_node.'\>/Usi';
	$modx->documentOutput = preg_replace($pattern,'',$modx->documentOutput);
	$preserve_node = preg_quote($preserve_node);
	$pattern = '/\<'.$preserve_node.'\>/Usi';
	$modx->documentOutput = preg_replace($pattern,'',$modx->documentOutput);
	$pattern = '/\<\/'.$preserve_node.'\>/Usi';
	$modx->documentOutput = preg_replace($pattern,'',$modx->documentOutput);
}

/*---------------------- ERROR CHECKING --------------------------------------*/
// http://wiki.modxcms.com/index.php/API:logEvent
if ($modx->event->name != 'OnWebPagePrerender') { 
	$msg = 'Mobile Template Switcher: Plugin must be triggered by the OnWebPagePrerender event.  Instead it was triggered by '.$modx->event->name;
	$modx->logEvent(3, 3, $msg, 'Mobile Template Switcher');
	return; 
};

$msg = '';
// warn if any of those are unset
if ( !isset($mobile_node) || $mobile_node == '') {
	$msg .= 'Configuration error: Mobile node name not defined. Default value used. ';
	$mobile_node = 'mobile';
}
if ( !isset($standard_node) || $standard_node == '' ) {
	$msg .= 'Configuration error: Standard node name not defined. Default value used. ';
	$standard_node = 'standard';
}
if ( !isset($force_browser_detect) || $force_browser_detect == '') {
	$msg .= 'Configuration error: Force browser detect URL parameter not defined. Default value used. ';
	$force_browser_detect = 'detect';
}
if ($msg != '') {
	$modx->logEvent(3, 2, $msg,'Mobile Template Switcher'); 
}

// $mobile_node, $standard_node, $force_browser_detect MUST be distinct
// this is a cheap trick... using PHP hash to "count" distinct values.
$hash[$mobile_node] = 1;
$hash[$standard_node] = 1;
$hash[$force_browser_detect] = 1;
if (count($hash) < 3) {
	$msg = 'Configuration error: $mobile_node, $standard_node, $force_browser_detect MUST be distinct values.';
	$modx->logEvent(3, 3, $msg,'Mobile Template Switcher'); 
	return;
}


/*----------- Here begins the logical block ----------------------------------*/
if ( isset($_GET[$url_param]) && $_GET[$url_param] == $mobile_node ) { 
	store_user_prefs($mobile_node, $usecookie);
	delete_template_nodes($standard_node, $mobile_node);
} elseif ( isset($_GET[$url_param]) && $_GET[$url_param] == $standard_node ) { 
	store_user_prefs($standard_node, $usecookie);
	delete_template_nodes($mobile_node, $standard_node);
} elseif ( isset($_GET[$url_param]) && $_GET[$url_param] == $force_browser_detect ) { 
	clear_user_prefs();
	if(is_mobile_device($ipad,$iphone,$android,$opera,$blackberry,$palm,$windows,false,false)){
		delete_template_nodes($standard_node, $mobile_node);
	} else {
		delete_template_nodes($mobile_node, $standard_node);
	}
} elseif ( get_user_prefs() == $mobile_node ) { 
	delete_template_nodes($standard_node, $mobile_node);
} elseif ( get_user_prefs() == $standard_node ) { 
	delete_template_nodes($mobile_node, $standard_node);
} else {
	if(is_mobile_device($ipad,$iphone,$android,$opera,$blackberry,$palm,$windows,false,false)){
		delete_template_nodes($standard_node, $mobile_node);
		store_user_prefs($mobile_node, $usecookie);
	} else {
		store_user_prefs($standard_node, $usecookie);
		delete_template_nodes($mobile_node, $standard_node);
	}
}