<?php
/**
 * @version		$Id: jqsmoothtop.php 2013-7-4 20:41:25Z eschneider $
 * @package		plg_sys_jqsmoothtop
 * @version		1.0.0
 * @copyright	Copyright (C) 2013 Eric Schneider. All rights reserved.
 * @license		GNU General Public License version 2 or later; see LICENSE.txt
 */

// No direct access
defined('_JEXEC') or die;
jimport('joomla.plugin.plugin');

class plgSystemjQSmoothTop extends JPlugin {

	function onBeforeRender() {

		// do we run in administrator?
		$app = JFactory::getApplication();
		if($app->isAdmin() && $this->params->get('runInAdmin',0)==0) return true;

		$doc = JFactory::getDocument();
		// we don't run in pages that aren't html
		if($doc->getType() != 'html') return true;

		// we don't run in modal pages or other incomplete pages
		$nogo = array('component','raw');
		if(in_array(JRequest::getString('tmpl'),$nogo)) return true;

		// get our parameters from Joomla!
		$params = json_decode ($this->params, true);

		// figure out a couple of positions
		$units = is_numeric ($params['horizontalPosition']) ? 'px' : '';
		$params['horizontalLocation'] = $params['horizontalAlign'] == 'center' ? 'left : (jQuery(window).innerWidth() - jQSmoothTop.outerWidth()) / 2' : $params['horizontalAlign'] . " : " . $params['horizontalPosition'];
		if ($params['horizontalAlign'] == 'center') {
			$params['horizontalLocation'] =
<<<CENTERME
	function centerMe(element) {
		element.css({ left : (jQuery(window).innerWidth() - jQSmoothTop.outerWidth()) / 2 })
	};
	centerMe(jQSmoothTop);
	jQuery(window).resize(function() { centerMe(jQSmoothTop) });
CENTERME;
		} else {
			$params['horizontalLocation'] = 'jQSmoothTop.css({ ' . $params['horizontalAlign'] . ' : ' . $params['horizontalPosition'] . '})';
		}

		$params['hangPosition'] = $params['showPosition'] + $params['hangDistance'];

		$start_at_top = $this->params->get('topAlways') ? "\t// start at the top\n\tjQuery('body,html').scrollTop(0);\n" : "";

		// the following section presents a paradox: do we format for readability here or a readable output?
		$script =
<<<SCRIPT
jQuery(document).ready(function(){
$start_at_top
	// make our jQSmoothTop tag
	jQuery('body').append('<div id="jQSmoothTop" class="jQSmoothTop" style="position:fixed; display:block; visibility:visible; zoom:1; opacity:1; cursor:pointer; $params[verticalAlign]: $params[showPosition]px; z-index:1040;"><a href="#top" title="$params[linkTitle]"><span></span>$params[linkText]</a></div>');
	// and assign it to a handy variable
	var jQSmoothTop = jQuery('#jQSmoothTop');

	// figure out the hide position
	hidePosition = -$params[showPosition] - jQSmoothTop.outerHeight();

	// do we need to align left, right or center (done partially in php)
	$params[horizontalLocation];

	// hide #back-top first
	jQSmoothTop.css({ opacity : 0, $params[verticalAlign] : hidePosition });

	// fade in #jQSmoothTop if we need to
	jQuery(window).scroll(function () {
		if (jQuery(this).scrollTop() >= $params[fadePosition] && jQSmoothTop.css('$params[verticalAlign]') == hidePosition + 'px' && !jQuery('body,html').is(':animated')) {
			// show our tag
			jQSmoothTop
				.stop(true, true).animate(
					{ $params[verticalAlign] : $params[hangPosition], opacity : $params[fadeMouseLeave],  display : 'block' },
					{ duration : $params[fadeSpeed], specialEasing: { $params[verticalAlign] : 'linear', opacity : 'easeInCubic' }}
				)
				.animate({ $params[verticalAlign] : $params[showPosition] }, $params[hangSpeed], 'linear');
		} else if (jQuery(this).scrollTop() < $params[fadePosition] && jQSmoothTop.css('$params[verticalAlign]') == $params[showPosition] + 'px' && !jQuery('body,html').is(':animated')) {
			// hide our tag
			jQSmoothTop
				.animate({ $params[verticalAlign] : $params[hangPosition] }, $params[hangSpeed], 'linear')
				.animate(
					{ $params[verticalAlign] : hidePosition, opacity : 0,  display : 'none' },
					{ duration : $params[fadeSpeed], specialEasing: { $params[verticalAlign] : 'linear', opacity : 'easeOutCubic' }, complete : function(){jQSmoothTop.stop(true, true)}}
				);
		}
	});

	// add some events
	jQuery('#jQSmoothTop a')
		// add a nifty hover effect
		.mouseenter(function () {
			if (jQSmoothTop.css('$params[verticalAlign]') == $params[showPosition] + 'px' && jQSmoothTop.css('opacity') == $params[fadeMouseLeave]){
				jQSmoothTop.animate({ opacity : $params[fadeMouseEnter] }, 200, 'linear')};
		})
		.mouseleave(function () {
			if (jQSmoothTop.css('$params[verticalAlign]') == $params[showPosition] + 'px' && jQSmoothTop.css('opacity') == $params[fadeMouseEnter]){
				jQSmoothTop.animate({ opacity : $params[fadeMouseLeave] }, 200, 'linear')};
		})
		// scroll body to $params[scrollTo]px on click
		.on('click', function (event) {
			event.preventDefault(); // <---- This is the magic stuff
			jQuery('#jQSmoothTop a').blur();
			jQuery('body,html').animate({ scrollTop : $params[scrollTo] }, $params[scrollSpeed], $params[scrollEffect]);
		});
});
SCRIPT;

		// if DS (Directory Separator) is no defined, fix it!
		!defined('DS') && define('DS', DIRECTORY_SEPARATOR);

		// should we load jQuery?
		if ($this->params->get('loadjQuery')) {
			// use version appropriate means to load local copy of jQuery
			if ($this->params->get('loadjQuery')==1 && version_compare(JVERSION,'3.0.0', '<') && !$app->get('jquery')) {
				$doc->addScript(JURI::root( true ).DS.'plugins'.DS.'system'.DS.'jqsmoothtop'.DS.'js'.DS.'jquery-1.10.2.min.js', 'text/javascript');
				JFactory::getApplication()->set('jquery', true);
				// use jQuery noConflict?
				if ($this->params->get('noConflict')==1) {
					$doc->addScript(JURI::root( true ).DS.'plugins'.DS.'system'.DS.'jqsmoothtop'.DS.'js'.DS.'jquery.noconflict.js', 'text/javascript');
				}
			} else if ($this->params->get('loadjQuery')==2 && version_compare(JVERSION,'3.0.0', '<') && !$app->get('jquery')) {
				// load jQuery from jQuery's CDN
				$doc->addScript('http://code.jquery.com/jquery-1.10.2.min.js', 'text/javascript');
				JFactory::getApplication()->set('jquery', true);
				// use jQuery noConflict?
				if ($this->params->get('noConflict')==1) {
					$doc->addScript(JURI::root( true ).DS.'plugins'.DS.'system'.DS.'jqsmoothtop'.DS.'js'.DS.'jquery.noconflict.js', 'text/javascript');
				}
			} else {
				JHtml::_('jquery.framework');
			}
		}

		// load easing for transition effects beyond 'linear' and 'swing'
		if ($this->params->get('loadjQueryEasing')==1) {
			// load local copy of jQuery Easing
			$doc->addScript(JURI::root( true ).DS.'plugins'.DS.'system'.DS.'jqsmoothtop'.DS.'js'.DS.'jquery.easing.min.js', "text/javascript");
		} else if ($this->params->get('loadjQueryEasing')==2) {
			// load jQuery Easing from CloudFlare's CDN
			$doc->addScript("http://cdnjs.cloudflare.com/ajax/libs/jquery-easing/1.3/jquery.easing.min.js", "text/javascript");
		}
		$doc->addScriptDeclaration ($script, 'text/javascript');
		if($this->params->get('useCustomCSS',1)==1) $doc->addStyleDeclaration($this->params->get('customCSS'));
		return true;
	}
}