<?php
/********************************************************************
Product    : Simple Tabs Plugin
Date       : 1 December 2023
Copyright  : Les Arbres Design 2022-2023
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;
use Joomla\CMS\Language\Text;

class plgContentsimpletabs 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, &$plugin_params, $limitstart=null)
{
	$app = Factory::getApplication();
	if (!$app->isClient('site'))
		return;
	if (empty($article->text))
		return;
	if (strpos($article->text, '{tab ') === false)
		return;
	$document = $app->getDocument();
    if ($document instanceof \Joomla\CMS\Document\HtmlDocument)
	    $doc_type = 'html';
	else
		$doc_type = '';

// load our CSS	and JS

	$css = '/media/plg_simpletabs/simpletabs.css';
	$override_css = '/media/plg_simpletabs/_simpletabs.css';
	if (file_exists(JPATH_SITE.$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')
		$document->addScript(URI::root(true).'/media/plg_simpletabs/simpletabs.js?104');
	static $set_num = 1;						// needed to handle multiple articles on the same page

// if there is a "tab" URL variable, we'll try to find the matching tab and open it

	$jinput = Factory::getApplication()->input;
	$url_tab = $jinput->get('tab', '', 'string');
	$url_tab = strtolower(str_replace(' ','',$url_tab));

// get a list of all tab tags including {tab-whatever}...{/tabs-whatever}
// for nested tab syntax see https://docs3.regularlabs.com/tabs/going-further/nested-tabs#syntax

	$tabnames[] = 'tab';	
    $regex = "#\{(tab\-\S*).*?\}#s";
    if (preg_match_all($regex, $article->text, $matches)) 
        foreach (array_unique($matches[1]) as $subset)
            $tabnames[] = $subset;
	$tabnames = array_reverse($tabnames);

// get an array of {tab...} tags in the article

	foreach ($tabnames as $tabname)
		{
		$close_tag = substr($tabname,0,3).'s'.substr($tabname,3);
		$regex = '#{'.$tabname.'\s(.*?)}|{/'.$close_tag.'}#s';
		if (preg_match_all($regex, $article->text, $matches, PREG_SET_ORDER | PREG_OFFSET_CAPTURE) == 0)
			continue;

		$first_offset = $matches[0][0][1];			// 	get the text before the first {tab call
		$new_text = substr($article->text, 0, $first_offset);

// for each call, generate the tab structure

		$tab_num = 1;
		$tab_text = '<div class="sst-outer">';
		$content_text = '';
		foreach ($matches as $i => $match)
			{
			$call = $match[0][0];				// e.g. {tab title="Blah blah blah" class="blue" open="true"} or {/tabs}
			$params = self::parse($call, $tabname, $tab_num);
			$alias = $params['alias'];
			if (empty($alias))
				$alias = $set_num.'-'.$tab_num;
            if (!strstr($call, '{/'.$close_tag.'}') && (!empty($url_tab) && ($url_tab == $alias)))
				$params['open'] = 'true';					// URL param takes precedence over plugin param
			$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, '{/'.$close_tag.'}'))
				{
				$tab_text .= '</div>'; 						// close the tab controls
				$new_text .= $tab_text;						// add tab controls to output buffer
				$new_text .= $content_text;					// add content divs to output buffer
				$new_text .= $content;						// add any text after {/tabs}
				$tab_text = '<div class="sst-outer">';		// ready for another set of tabs
				$content_text = '';
				$set_num ++;
				$tab_num = 1;
				continue;
				}
			if ($params['open'] == 'true')
				$tab_class = ' class="sst-title sstt-iopen sstt-'.$set_num.' '.$params['class'].'"';
			else
				$tab_class = ' class="sst-title sstt-'.$set_num.' '.$params['class'].'"';
			$tab_text .= '<div id="sstt-'.$set_num.'-'.$tab_num.'"'.$tab_class.' data-set="'.$set_num.'" data-tab="'.$tab_num.'" data-alias="'.$alias.'">'.$params['title'].'</div>';
			$content_text .= '<div id="sstc-'.$set_num.'-'.$tab_num.'" class="sst-content sstc-'.$set_num.' '.$params['class'].'">'.$content.'</div>';
			$tab_num ++;
			}
		$article->text = $new_text;
		}
}

//-------------------------------------------------------------------------------
// Parse and validate the plugin parameters, which may be in two formats:
//   {tab This Is The Title}
//   {tab title="This Is The Title" alias="tab-1" open="true" class="blue"}
//
static function parse($call, $tabname, $tab_num)
{
    $offset = strlen($tabname) + 2;
	if (!strstr($call, '='))
        $params['title'] = substr($call, $offset, -1);
	else
		$params = Utility::parseAttributes($call);
	if (!isset($params['title'])) $params['title'] = Text::_('JNONE');
	if (!isset($params['open']))  
		if ($tab_num == 1)
			$params['open'] = 'true';
		else
			$params['open'] = 'false';
	if (!isset($params['class'])) $params['class'] = '';
	if (empty($params['alias']))
		{
		$title = strip_tags($params['title']);
		$title = strtolower(str_replace(' ', '-', $title));
		$params['alias'] = trim(preg_replace('/[^a-z0-9\-]/', '', $title),'-');
		}
	return $params;
}

}