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<?php
/**
 * @package         Regular Labs Library
 * @version         23.9.3039
 * 
 * @author          Peter van Westen <info@regularlabs.com>
 * @link            https://regularlabs.com
 * @copyright       Copyright © 2023 Regular Labs All Rights Reserved
 * @license         GNU General Public License version 2 or later
 */

namespace RegularLabs\Library\Condition;

defined('_JEXEC') or die;

use JDocument;
use Joomla\CMS\Application\CMSApplication;
use Joomla\CMS\Factory as JFactory;
use Joomla\CMS\Filesystem\File as JFile;
use Joomla\CMS\MVC\Model\BaseDatabaseModel as JModel;
use Joomla\CMS\Version;
use RegularLabs\Library\Condition;
use RegularLabs\Library\RegEx;

/**
 * Class Php
 *
 * @package RegularLabs\Library\Condition
 */
class Php extends Condition
{
    public static function createFunctionInMemory($string = '')
    {
        $file_name = getmypid() . '_' . md5($string);

        $tmp_path  = JFactory::getConfig()->get('tmp_path', JPATH_ROOT . '/tmp');
        $temp_file = $tmp_path . '/regularlabs/custom_php/' . $file_name;

        // Write file
        if ( ! file_exists($temp_file) || is_writable($temp_file))
        {
            JFile::write($temp_file, $string);
        }

        // Include file
        include_once $temp_file;

        // Delete file
        if ( ! JFactory::getApplication()->get('debug'))
        {
            @chmod($temp_file, 0777);
            @unlink($temp_file);
        }
    }

    public static function getApplication()
    {
        if (JFactory::getApplication()->input->get('option') != 'com_finder')
        {
            return JFactory::getApplication();
        }

        return CMSApplication::getInstance('site');
    }

    public static function getDocument()
    {
        if (JFactory::getApplication()->input->get('option') != 'com_finder')
        {
            return JFactory::getDocument();
        }

        $lang    = JFactory::getLanguage();
        $version = new Version;

        $attributes = [
            'charset'      => 'utf-8',
            'lineend'      => 'unix',
            'tab'          => "\t",
            'language'     => $lang->getTag(),
            'direction'    => $lang->isRtl() ? 'rtl' : 'ltr',
            'mediaversion' => $version->getMediaVersion(),
        ];

        return JDocument::getInstance('html', $attributes);
    }

    public static function getVarInits()
    {
        return [
            '$app = $mainframe = RegularLabs\Library\Condition\Php::getApplication();',
            '$document = $doc = RegularLabs\Library\Condition\Php::getDocument();',
            '$database = $db = JFactory::getDbo();',
            '$user = JFactory::getApplication()->getIdentity() ?: JFactory::getUser();',
            '$Itemid = $app->input->getInt(\'Itemid\');',
        ];
    }

    public function execute($string = '', $article = null, $module = null)
    {
        if ( ! $function_name = $this->getFunctionName($string))
        {
            // Something went wrong!
            return true;
        }

        return $this->runFunction($function_name, $string, $article, $module);
    }

    public function pass()
    {
        if ( ! is_array($this->selection))
        {
            $this->selection = [$this->selection];
        }

        $pass = false;

        foreach ($this->selection as $php)
        {
            // replace \n with newline and other fix stuff
            $php = str_replace('\|', '|', $php);
            $php = RegEx::replace('(?<!\\\)\\\n', "\n", $php);
            $php = trim(str_replace('[:REGEX_ENTER:]', '\n', $php));

            if ($php == '')
            {
                $pass = true;
                break;
            }

            ob_start();
            $pass = (bool) $this->execute($php, $this->article, $this->module);
            ob_end_clean();

            if ($pass)
            {
                break;
            }
        }

        return $this->_($pass);
    }

    private static function extractUseStatements(&$string)
    {
        $use_statements = [];

        $string = trim($string);

        RegEx::matchAll('^use\s+[^\s;]+\s*;', $string, $matches, 'm');

        foreach ($matches as $match)
        {
            $use_statements[] = $match[0];
            $string           = str_replace($match[0], '', $string);
        }

        $string = trim($string);

        return implode("\n", $use_statements);
    }

    private function generateFileContents($function_name = 'rl_function', $string = '')
    {
        $use_statements = self::extractUseStatements($string);

        $init_variables = self::getVarInits();

        $contents = [
            '<?php',
            'defined(\'_JEXEC\') or die;',
            $use_statements,
            'function ' . $function_name . '($article, $module){',
            implode("\n", $init_variables),
            $string,
            ';return true;',
            ';}',
        ];

        $contents = implode("\n", $contents);

        // Remove Zero Width spaces / (non-)joiners
        $contents = str_replace(
            [
                "\xE2\x80\x8B",
                "\xE2\x80\x8C",
                "\xE2\x80\x8D",
            ],
            '',
            $contents
        );

        return $contents;
    }

    private function getArticleById($id = 0)
    {
        if ( ! $id)
        {
            return null;
        }

        if ( ! class_exists('ContentModelArticle'))
        {
            require_once JPATH_SITE . '/components/com_content/models/article.php';
        }

        $model = JModel::getInstance('article', 'contentModel');

        if ( ! method_exists($model, 'getItem'))
        {
            return null;
        }

        return $model->getItem($id);
    }

    private function getFunctionName($string = '')
    {
        $function_name = 'regularlabs_php_' . md5($string);

        if (function_exists($function_name))
        {
            return $function_name;
        }

        $contents = $this->generateFileContents($function_name, $string);
        self::createFunctionInMemory($contents);

        if ( ! function_exists($function_name))
        {
            // Something went wrong!
            return false;
        }

        return $function_name;
    }

    private function runFunction($function_name = 'rl_function', $string = '', $article = null, $module = null)
    {
        if ( ! $article && strpos($string, '$article') !== false)
        {
            if ($this->request->option == 'com_content' && $this->request->view == 'article')
            {
                $article = $this->getArticleById($this->request->id);
            }
        }

        return $function_name($article, $module);
    }
}