<?php
/********************************************************************
Product    : Simple Sliders Plugin
Date       : 30 November 2023
Copyright  : Les Arbres Design 2020-2023
Contact    : https://www.lesarbresdesign.info
Licence    : GNU General Public License
*********************************************************************/
defined('_JEXEC') or die('Restricted Access');

use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Factory;
use Joomla\CMS\Utility\Utility; 
use Joomla\CMS\HTML\HTMLHelper;
use Joomla\CMS\Uri\Uri;

class plgContentsimplesliders extends CMSPlugin
{

//-------------------------------------------------------------------------------
// Joomla calls this for every article so we must determine as quickly as possible 
//  if there are any calls for us in this article
//
function onContentPrepare($context, &$article, &$params, $limitstart=null)
{
	$app = Factory::getApplication();
	if (!$app->isClient('site'))
		return;
	if (empty($article->text))
		return;
	if (strpos($article->text, '{slider ') === false)
		return;
	$document = $app->getDocument();
    if ($document instanceof \Joomla\CMS\Document\HtmlDocument)
	    $doc_type = 'html';
	else
		$doc_type = '';

// load our CSS	and JS

	$app = Factory::getApplication();
	$css = '/media/plg_simplesliders/simplesliders.css';
	$override_css = '/media/plg_simplesliders/_simplesliders.css';
	if (file_exists(JPATH_SITE.$override_css))
		$css = $override_css;
	if (file_exists(JPATH_SITE.$css))
		{
		$ftime = @filemtime(JPATH_SITE.$css);
		if (!$ftime)
			$ftime = '0';
	    if ($doc_type == 'html')
			$document->addStyleSheet(URI::root(true).$css.'?'.$ftime);
		}
    if ($doc_type == 'html')
		{
		HTMLHelper::_('jquery.framework');           					// make sure jQuery is loaded
		$document->addScript(URI::root(true).'/media/plg_simplesliders/simplesliders.js?104');
		}

// is there a "slider" URL variable?

	$jinput = Factory::getApplication()->input;
	$url_slider = $jinput->get('slider', '', 'string');

// create an array ($matches) of {slider...} tags in the article

	$regex = "#{slider\s(.*?)}|{/sliders}#s";
	if (preg_match_all($regex, $article->text, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE) == 0)
		return;
	$new_text = '';
// $new_text = '<pre>'.print_r($matches,true).'</pre>';	  // useful for debugging
	
// 	get the text before the first {slider call

	$first_offset = $matches[0][0][1];
	$new_text .= substr($article->text,0,$first_offset);

// for each call, generate the slider structure

	static $slider_num;			// handle multiple articles on the same page
	if (!isset($slider_num))
		$slider_num = 1;

	foreach ($matches as $i => $match)
		{
		$call = $match[0][0];				// e.g. {slider title="Blah blah blah" open="false"}
		if (empty($match[1][0]))
			$match_params = '';
		else
			$match_params = $match[1][0];	// e.g. title="Blah blah blah" open="false"
		$parsed_params = self::parse_params($match_params);
		$call_offset = $match[0][1];
		$call_offset_end = $call_offset + strlen($call);
		if (isset($matches[$i+1]))
			{
			$next_match_offset = $matches[$i+1][0][1];
			$content_length = $next_match_offset - $call_offset_end;
			$content = substr($article->text,$call_offset_end,$content_length);
			}
		else
			$content = substr($article->text,$call_offset_end);	// take the rest of the buffer
		if (strstr($call, '{/sliders}'))
			{
			$new_text .= $content;
			continue;
			}
		$slider_id = 'slider'.$slider_num;
		if (empty($parsed_params['title']))
			$parsed_params['title'] = $slider_num; // if no title, default it (if slider title is a number, check the plugin call parameters!)
		else
			$slider_id = strtolower(str_replace(' ','-',$parsed_params['title']));		// use title as slider id
		if (!empty($parsed_params['alias']))			// if we have an alias, use that as the slider id
			$slider_id = $parsed_params['alias'];
		$scroll = '';
		if ($url_slider == $slider_id)
			{
			$parsed_params['open'] = 'true';	// open the requested slider
			$scroll = ' data-siv="true"';
			}
		elseif ($url_slider != '')
			$parsed_params['open'] = '';		// .. and close all others
		$new_text .= '<div id="'.$slider_id.'" class="ssl-outer '.$parsed_params['class'].'">';
		if ($parsed_params['open'] == 'true')
			{
			$new_text .= '<div class="ssl-title ssl-title-open" data-num="'.$slider_num.'"'.$scroll.'>'.$parsed_params['title'].'</div>';
			$new_text .= '<div id="ssl-'.$slider_num.'" class="ssl-content ssl-content-open">'.$content.'</div></div>';
			}
		else
			{
			$new_text .= '<div class="ssl-title" data-num="'.$slider_num.'">'.$parsed_params['title'].'</div>';
			$new_text .= '<div id="ssl-'.$slider_num.'" class="ssl-content">'.$content.'</div></div>';
			}
		$slider_num ++;
		}

	$article->text = $new_text;
}

//-------------------------------------------------------------------------------
// Parse and validate the plugin parameters, which may be in two formats:
//   {slider This Is The Title}
//   {slider title="This Is The Title" alias="slider-1" open="true" class="blue"}
//
function parse_params($match_params)
{
	if (!strstr($match_params,'='))
		$params['title'] = $match_params;
	else
		$params = Utility::parseAttributes($match_params);
	if (!isset($params['title'])) $params['title'] = '';
	if (!isset($params['alias'])) $params['alias'] = '';
	if (!isset($params['open']))  $params['open'] = '';
	if (!isset($params['class'])) $params['class'] = '';
	return $params;
}

}