<?php

/**
 * This file contains the \QUI\Cache\Handler
 */

namespace QUI\Cache;

use MatthiasMullie\Minify\CSS;
use QUI;
use QUI\Cache\Cookie\LoggedInCookie;

use function array_merge;
use function array_unique;
use function count;
use function defined;
use function file_exists;
use function file_get_contents;
use function is_array;
use function is_dir;
use function is_string;
use function json_encode;
use function ltrim;
use function mb_strpos;
use function md5;
use function parse_str;
use function parse_url;
use function preg_match;
use function preg_match_all;
use function preg_replace_callback;
use function serialize;
use function sort;
use function str_replace;
use function strlen;
use function strpos;
use function substr_replace;
use function trim;
use function unlink;

use const PATHINFO_EXTENSION;
use const PREG_SET_ORDER;

/**
 * Class Handler
 * Handles the request and the caching system
 *
 * @package QUI\Cache
 */
class Handler
{
    /**
     * @var null|bool
     */
    protected ?bool $webP = null;

    /**
     * @return Handler
     */
    public static function init(): Handler
    {
        return new self();
    }

    /**
     * Return the path to the cache dir
     *
     * @return string
     */
    public function getCacheDir(): string
    {
        return VAR_DIR . 'cache/packages/cache/';
    }

    /**
     * Return the url path to the cache dir
     *
     * @return string
     */
    public function getURLCacheDir(): string
    {
        return URL_VAR_DIR . 'cache/packages/cache/';
    }

    /**
     * @return bool|null
     */
    public function useWebP(): ?bool
    {
        if (getenv('QUIQQER_CACHE_DISABLE_WEBP')) {
            return false;
        }

        if (defined('QUIQQER_CACHE_DISABLE_WEBP')) {
            return false;
        }

        if ($this->webP !== null) {
            return $this->webP;
        }

        try {
            $Package = QUI::getPackage('quiqqer/cache');
            $this->webP = $Package->getConfig()?->get('settings', 'webp');
            $this->webP = !!$this->webP;
        } catch (QUI\Exception $Exception) {
            QUI\System\Log::addDebug($Exception->getMessage());
        }

        return $this->webP;
    }

    /**
     * Get Cache from request
     *
     * @return string
     * @throws QUI\Exception
     */
    public function getCacheFromRequest(): string
    {
        // loged in users get no cache
        if (QUI::getUsers()->isAuth(QUI::getUserBySession())) {
            throw new QUI\Exception('Logged in user. No Cache exists', 404);
        }

        $Request = QUI::getRequest();
        $uri = $Request->getUri();
        $query = $Request->getQueryString();

        if (is_string($query)) {
            parse_str($query, $query);
        }

        if (!is_array($query)) {
            $query = [];
        }

        if (isset($query['_url'])) {
            unset($query['_url']);
        }

        if (!empty($query)) {
            throw new QUI\Exception('Get Params exists. No Cache exists', 404);
        }

        $dir = $this->getCacheDir();
        $cacheFile = $dir . md5($uri) . QUI\Rewrite::getDefaultSuffix();

        if (file_exists($cacheFile) && !is_dir($cacheFile)) {
            $cache = file_get_contents($cacheFile);

            if (empty($cache)) {
                throw new QUI\Exception('No Cache exists', 404);
            }

            // replace user data
            return (string)preg_replace_callback(
                '/<script id="quiqqer-user-defined">(.*)<\/script>/Uis',
                function () {
                    $Nobody = QUI::getUsers()->getNobody();
                    $Country = $Nobody->getCountry();
                    $countryCode = '';

                    if ($Country) {
                        $countryCode = $Country->getCode();
                    }

                    $user = [
                        'id' => 0,
                        'name' => $Nobody->getName(),
                        'lang' => $Nobody->getLang(),
                        'country' => $countryCode
                    ];

                    return '<script id="quiqqer-user-defined">window.QUIQQER_USER = ' .
                        json_encode($user) . ';</script>';
                },
                $cache
            );
        }

        throw new QUI\Exception('No Cache exists', 404);
    }

    /**
     * Generate a cache file from the request
     *
     * @param string $content - content to store
     * @throws QUI\Exception
     */
    public function generateCacheFromRequest(string &$content): void
    {
        // logged-in users shouldn't generate any cache
        if (QUI::getUsers()->isAuth(QUI::getUserBySession())) {
            return;
        }

        // @todo create cache-id
        // cache-id = group ids hash


        $Package = QUI::getPackage('quiqqer/cache');
        $cacheSetting = $Package->getConfig()?->get('settings', 'cache');
        $jsCacheSetting = $Package->getConfig()?->get('settings', 'jscache');
        $htmlCacheSetting = $Package->getConfig()?->get('settings', 'htmlcache');
        $lazyLoadingSetting = $Package->getConfig()?->get('settings', 'lazyloading');

        if (!$cacheSetting) {
            return;
        }

        $Request = QUI::getRequest();
        $uri = $Request->getUri();
        $query = $Request->getQueryString();

        // check if host exist, if not, we generate no cache
        $vhosts = QUI::vhosts();
        $urlParams = parse_url($uri);
        $urlHost = $urlParams['host'] ?? '';

        if (empty($urlHost) || !isset($vhosts[$urlHost])) {
            QUI\System\Log::addInfo('Missing vhost for cache generation', [
                'urlParams' => $urlParams,
                'uri' => $uri,
                '$urlHost' => $urlHost
            ]);

            return;
        }

        if (is_string($query)) {
            parse_str($query, $parseStr);
            $query = $parseStr;
        }

        if (!is_array($query)) {
            $query = [];
        }

        if (isset($query['_url'])) {
            unset($query['_url']);
        }

        if (!empty($query)) {
            throw new QUI\Exception('Get Params exists. No Cache exists', 404);
        }

        $cacheId = md5($uri);
        $dir = $this->getCacheDir();
        $binDir = $this->getCacheDir() . 'bin/';
        //$urlBinDir = $this->getURLCacheDir() . 'bin/';

        QUI\Utils\System\File::mkdir($dir);
        QUI\Utils\System\File::mkdir($binDir);

        /*
        $Minify = new Minify();
        $Minify->setCache($binDir);
        $Minify->setDocRoot(CMS_DIR);
        */

        /**
         * HTML
         */
        $cacheHtmlFile = $dir . $cacheId . QUI\Rewrite::getDefaultSuffix();
        $this->writeCacheFile($cacheHtmlFile, $content);


        /**
         * Bundle JavaScript
         */
        if ($jsCacheSetting) {
            $content = $this->generateJavaScriptCache($content);
            $this->writeCacheFile($cacheHtmlFile, $content);
        }

        /**
         * lazy loading during the cache
         */

        if ($lazyLoadingSetting) {
            $content = Parser\LazyLoading::getInstance()->parse($content);
            $this->writeCacheFile($cacheHtmlFile, $content);
        }

        /**
         * convert to webp -> data-image
         */
        $useWebP = Handler::init()->useWebP();

        if ($useWebP) {
            $content = $this->parseImagesToWebP($content);
            $this->writeCacheFile($cacheHtmlFile, $content);
        }

        /**
         * Bundle CSS
         */
        $content = $this->generateCSSCache($content);
        $this->writeCacheFile($cacheHtmlFile, $content);

        /**
         * HTML optimize
         */
        if ($htmlCacheSetting) {
            $result = Optimizer::optimizeHtml($content);
            /*
            $sources = [
                new Minify_Source([
                    'id' => $cacheId,
                    'content' => $content,
                    'contentType' => 'text/html',
                    'minifyOptions' => [
                        'jsMinifier' => ['JSMin', 'minify']
                    ]
                ])
            ];

            $result = $Minify->combine($sources, [
                'content' => $content,
                'id' => $cacheId,
                'minifyAll' => true
            ]);
*/
            // Workaround --> quiqqer/cache#46
            if (empty($result)) {
                unlink($cacheHtmlFile);

                return;
            }

            $this->writeCacheFile($cacheHtmlFile, $result);
        }
    }

    /**
     * Clear the complete cache
     */
    public function clearCache(): void
    {
        try {
            QUI::getTemp()->moveToTemp($this->getCacheDir());
            QUI\Cache\Manager::clear('quiqqer/cache');
        } catch (\Exception $Exception) {
            QUI\System\Log::writeException($Exception);
        }
    }

    /**
     * @param string $content
     * @return string
     * @throws QUI\Exception
     */
    public function generateCSSCache(string $content): string
    {
        $Package = QUI::getPackage('quiqqer/cache');
        $cssEnabled = $Package->getConfig()?->get('css', 'status');

        if (!$cssEnabled || defined('QUIQQER_CACHE_NO_CSS_CACHE')) {
            return $content;
        }

        $binDir = $this->getCacheDir() . 'bin/';
        $urlBinDir = $this->getURLCacheDir() . 'bin/';

        $templateFiles = [];
        $cssFiles = [];

        $template = QUI::getRewrite()->getProject()?->getAttribute('template');
        $customCss = USR_DIR . QUI::getRewrite()->getProject()?->getName() . '/bin/custom.css';

        // if no template exists
        if (!is_string($template) || empty($template)) {
            return $content;
        }

        $templatePath = OPT_DIR . $template;
        $Template = QUI::getPackage($template);
        $templateParent = $Template->getTemplateParent();

        if ($templateParent) {
            $templateParent = $templateParent->getName();
        }

        preg_match_all(
            '/<link[^>]+href="([^"]*)"[^>]*>/Uis',
            $content,
            $matches,
            PREG_SET_ORDER
        );

        // filter files
        foreach ($matches as $match) {
            if (str_contains($match[0], 'rel') && !str_contains($match[0], 'rel="stylesheet"')) {
                continue;
            }

            if (mb_strpos($match[0], 'rel="preload"') !== false) {
                continue;
            }

            if (mb_strpos($match[0], 'rel="prefetch"') !== false) {
                continue;
            }

            if (mb_strpos($match[0], 'rel="preconnect"') !== false) {
                continue;
            }

            if (str_contains($match[0], 'alternate')) {
                continue;
            }

            if (str_contains($match[0], 'next')) {
                continue;
            }

            if (str_contains($match[0], 'prev')) {
                continue;
            }

            if (str_contains($match[0], 'data-no-cache="1"')) {
                continue;
            }


            $file = CMS_DIR . $match[1];

            if (!file_exists($file)) {
                $parse = parse_url($file);
                $file = $parse['path'] ?? '';
            }

            if (!file_exists($file)) {
                continue;
            }

            $file = QUI\Utils\StringHelper::replaceDblSlashes($file);

            if (
                str_contains($file, $templatePath)
                || $file === $customCss
                || $templateParent && str_contains($file, $templateParent)
            ) {
                $templateFiles[] = [
                    'file' => $file,
                    'match' => $match
                ];
            } else {
                $cssFiles[] = [
                    'file' => $file,
                    'match' => $match
                ];
            }
        }

        /**
         * LOAD AMD
         */
        $amdCssFiles = $this->getAmdCssFiles($content);

        if (!empty($amdCssFiles)) {
            $jsContent = '<script>window.QUIQQER_CSS_PREFETCHED = ' . json_encode($amdCssFiles) . '</script>';
            $content = str_replace(
                '<!-- quiqqer-js-defined -->',
                '<!-- quiqqer-js-defined -->' . $jsContent,
                $content
            );

            // add css files
            foreach ($amdCssFiles as $cssFile => $v) {
                if (str_starts_with($cssFile, 'qui/')) {
                    $absPath = substr_replace(
                        $cssFile,
                        OPT_DIR . 'bin/qui/qui/',
                        0,
                        strlen('qui/')
                    );

                    $cssFiles[] = [
                        'file' => $absPath,
                        'match' => [
                            '<link href="' . $cssFile . '" rel="stylesheet">',
                            $cssFile
                        ]
                    ];

                    continue;
                }

                $absPath = substr_replace(
                    $cssFile,
                    OPT_DIR,
                    0,
                    strlen('package/')
                );

                $relPath = substr_replace(
                    $cssFile,
                    URL_OPT_DIR,
                    0,
                    strlen('package/')
                );

                $cssFiles[] = [
                    'file' => $absPath,
                    'match' => [
                        '<link href="' . $relPath . '" rel="stylesheet">',
                        $relPath
                    ]
                ];
            }
        }


        $replace = '';

        // generate sediment css files
        if (count($cssFiles)) {
            $cssContent = '';
            $cssId = md5(serialize($cssFiles));
            $cacheSedFile = $binDir . $cssId . '.sed.cache.css';
            $cacheUrlSedFile = $urlBinDir . $cssId . '.sed.cache.css';

            foreach ($cssFiles as $fileData) {
                $file = $fileData['file'];
                $match = $fileData['match'];
                $cssFile = $binDir . md5($file) . '.css';

                $CSSMinify = new CSS();
                $CSSMinify->add($file);
                $CSSMinify->minify($cssFile);

                $comment = "\n/* File: $match[1] */\n";
                $cssContent .= $comment . file_get_contents($cssFile) . "\n";

                unlink($cssFile);

                // delete css from main content
                $content = str_replace($match[0], '', $content);
            }

            $this->writeCacheFile($cacheSedFile, $cssContent);

            $replace .= '<link href="' . $cacheUrlSedFile . '" rel="stylesheet" type="text/css" />';
        }

        // generate template files
        if (count($templateFiles)) {
            $cssContent = '';
            $cssId = md5(serialize($templateFiles));
            $cacheTplFile = $binDir . $cssId . '.tpl.cache.css';
            $cacheUrlTplFile = $urlBinDir . $cssId . '.tpl.cache.css';

            foreach ($templateFiles as $fileData) {
                $file = $fileData['file'];
                $match = $fileData['match'];
                $cssFile = $binDir . md5($file) . '.css';

                $CSSMinify = new CSS();
                $CSSMinify->add($file);
                $CSSMinify->minify($cssFile);

                $comment = "\n/* File: $match[1] */\n";
                $cssContent .= $comment . file_get_contents($cssFile) . "\n";

                unlink($cssFile);

                $content = str_replace($match[0], '', $content);
            }

            $this->writeCacheFile($cacheTplFile, $cssContent);

            $replace .= '<link href="' . $cacheUrlTplFile . '" rel="stylesheet" type="text/css" />';
        }

        $content = str_replace(
            '<!-- quiqqer css -->',
            $replace,
            $content
        );

        return $content;
    }

    /**
     * @param string $content
     * @return string
     */
    public function generateJavaScriptCache(string $content): string
    {
        $binDir = $this->getCacheDir() . 'bin/';
        $urlBinDir = $this->getURLCacheDir() . 'bin/';

        preg_match_all(
            '/<script[^>]*>(.*)<\/script>/Uis',
            $content,
            $matches,
            PREG_SET_ORDER
        );

        $jsContent = 'var QUIQQER_JS_IS_CACHED = true;';

        // add own cache js
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/cache/bin/Storage.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/qui/qui/lib/polyfills/Promise.js"></script>'];

        /**
         * LOAD AMD
         */
        preg_match_all(
            '/data-qui="([^"]*)"/Uis',
            $content,
            $amdModules,
            PREG_SET_ORDER
        );

        preg_match_all(
            '/data-qui-cache="([^"]*)"/Uis',
            $content,
            $cacheModules,
            PREG_SET_ORDER
        );

        $amdModules = array_merge($cacheModules, $amdModules);

        foreach ($amdModules as $amdModule) {
            $path = trim($amdModule[1]);
            $path = trim($path, '"');

            // consider relative path url to the js file
            if (file_exists(CMS_DIR . $path)) {
                $matches[] = [
                    '<script src="' . $path . '"></script>'
                ];

                continue;
            }

            if (!str_starts_with($path, 'package/')) {
                continue;
            }

            $path = $path . '.js';

            $absPath = substr_replace(
                $path,
                OPT_DIR,
                0,
                strlen('package/')
            );

            $relPath = substr_replace(
                $path,
                URL_OPT_DIR,
                0,
                strlen('package/')
            );

            if (file_exists($absPath)) {
                $matches[] = [
                    '<script src="' . $relPath . '"></script>'
                ];
            }
        }

        // default qui stuff
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/QUI.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/Locale.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/QUI.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/request/Ajax.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/Controls.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/DOM.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/Locale.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/Windows.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/utils/Push.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/utils/Object.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/utils/Elements.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/utils/Functions.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/utils/Controls.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/utils/System.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/utils/Animate.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/storage/Storage.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/lib/element-query/ResizeSensor.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/lib/element-query/ElementQuery.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/Control.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Handler.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Message.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Attention.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Information.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Success.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Loading.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/controls/messages/Error.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'bin/qui/qui/classes/utils/SimulateEvent.js"></script>'];

        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/core/bin/QUI/utils/Session.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/core/bin/QUI/Ajax.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/core/bin/QUI/Locale.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/core/bin/QUI/classes/Locale.js"></script>'];
        $matches[] = ['<script src="' . URL_OPT_DIR . 'quiqqer/core/bin/QUI/classes/request/Bundler.js"></script>'];


        foreach ($matches as $entry) {
            if (str_contains($entry[0], 'id="quiqqer-user-defined"')) {
                continue;
            }

            // quiqqer/cache#7
            if (str_contains($entry[0], 'type=')) {
                if (
                    !str_contains($entry[0], 'type="application/javascript"') &&
                    !str_contains($entry[0], 'type="text/javascript"')
                ) {
                    continue;
                }
            }

            if (str_contains($entry[0], 'data-no-cache="1"')) {
                continue;
            }

            if (!str_contains($entry[0], 'src=')) {
                $content = str_replace($entry, '', $content);

                if (isset($entry[1])) {
                    $jsContent .= $entry[1];
                }

                continue;
            }

            preg_match(
                '/<script\s+?src="([^"]*)"[^>]*>(.*)<\/script>/Uis',
                $entry[0],
                $matches
            );

            if (!isset($matches[1])) {
                continue;
            }

            $file = CMS_DIR . ltrim($matches[1], '/');

            if (!file_exists($file)) {
                $parse = parse_url($file);
                $file = $parse['path'] ?? '';
            }

            if (!file_exists($file)) {
                continue;
            }

            $jsContent .= file_get_contents($file) . ';';

            $content = str_replace($entry[0], '', $content);
        }


        // js id
        $jsId = md5($jsContent);

        $cacheJSFile = $binDir . $jsId . '.cache.js';
        $cacheURLJSFile = $urlBinDir . $jsId . '.cache.js';

        // create javascript cache file
        if (!file_exists($cacheJSFile)) {
            $this->writeCacheFile($cacheJSFile, $jsContent);

            Optimizer::optimizeJavaScriptViaQJO($cacheJSFile);
        }

        $cached = '<script src="' . $cacheURLJSFile . '" type="text/javascript"></script>' .
            '</body>';

        // insert quiqqer.cache.js
        $content = str_replace('</body>', $cached, $content);


        /**
         * Bundle require modules
         */
        $requirePackages = [];
        $jsContent = '';

        preg_replace_callback(
            '/data-qui="([^"]*)"/Uis',
            function ($found) use (&$requirePackages) {
                $requirePackages[] = $found[1];

                return $found[0];
            },
            $content
        );

        $requirePackages = array_unique($requirePackages);
        sort($requirePackages);

        foreach ($requirePackages as $require) {
            $found = strpos($require, 'package/');

            if ($found === false) {
                continue;
            }

            if ($found !== 0) {
                continue;
            }

            $file = trim(substr_replace($require, OPT_DIR, 0, strlen('package/')));

            if (!file_exists($file)) {
                $file = $file . '.js';
            }

            if (!file_exists($file)) {
                continue;
            }

            $jsContent .= file_get_contents($file) . ';';
        }

        $jsId = md5(serialize($requirePackages));
        $cacheJSFile = $binDir . $jsId . '.cache.pkg.js';
        $cacheURLJSFile = $urlBinDir . $jsId . '.cache.pkg.js';

        if (!file_exists($cacheJSFile)) {
            $this->writeCacheFile($cacheJSFile, $jsContent);

            Optimizer::optimizeJavaScriptViaQJO($cacheJSFile);
        }

        return str_replace(
            '</body>',
            '<script async src="' . $cacheURLJSFile . '" type="text/javascript"></script></body>',
            $content
        );
    }

    /**
     * Search the amd css files
     *
     * @param string $content
     * @return array<string, bool>
     */
    protected function getAmdCssFiles(string $content): array
    {
        preg_match_all(
            '/data-qui="([^"]*)"/Uis',
            $content,
            $amdModules,
            PREG_SET_ORDER
        );

        // default amd files
        $amdCssFiles = [
            'qui/controls/messages/Message.css' => true,
            'qui/controls/windows/Popup.css' => true,
            'qui/controls/buttons/Button.css' => true,
            'qui/controls/Control.css' => true,
            'qui/controls/loader/Loader.css' => true,
            'qui/controls/loader/Loader.fa-spinner.css' => true,
            'qui/controls/messages/Handler.css' => true
        ];

        foreach ($amdModules as $amdModule) {
            $path = trim($amdModule[1]);
            $path = trim($path, '"');

            if (!str_starts_with($path, 'package/')) {
                continue;
            }

            $path = $path . '.js';

            $absPath = substr_replace(
                $path,
                OPT_DIR,
                0,
                strlen('package/')
            );

            if (!file_exists($absPath)) {
                continue;
            }

            $moduleContent = (string)file_get_contents($absPath);

            if (!str_contains($moduleContent, 'css!')) {
                continue;
            }

            preg_match_all(
                '/css\!([^\'"]*)\.css/Uis',
                $moduleContent,
                $amdCssFileMatches,
                PREG_SET_ORDER
            );

            foreach ($amdCssFileMatches as $cssFile) {
                $amdCssFiles[$cssFile[1] . '.css'] = true;
            }
        }

        return $amdCssFiles;
    }

    /**
     * Helper to parse the content for webp files not in <picture> or <img>
     *
     * @param string $content
     * @return string
     */
    protected function parseImagesToWebP(string $content): string
    {
        return (string)preg_replace_callback(
            '#<img\b([^>]*)>#i',
            function (array $imgMatch) use ($content): string {
                $imgTag = $imgMatch[0];

                // Prüfen, ob das <img> direkt innerhalb eines <picture> steht (vereinfachte Annäherung)
                $pos = (int)strpos($content, $imgTag);
                $before = substr($content, 0, $pos);
                $openPic = strripos($before, '<picture');
                $closePic = strripos($before, '</picture>');

                // Wenn das letzte <picture> vor dem <img> nach dem letzten </picture> liegt, ist es innerhalb eines <picture>
                if ($openPic !== false && ($closePic === false || $openPic > $closePic)) {
                    return $imgTag; // NICHT ersetzen
                }

                // src/srcset/data-image/data-src ersetzen
                return (string)preg_replace_callback(
                    '#(src|data-image|data-src)="([^"]*)"#i',
                    function ($data) {
                        $src = $data[2];
                        if (!str_contains($src, 'media/cache')) {
                            return $data[0];
                        }
                        $ext = pathinfo($src, PATHINFO_EXTENSION);
                        if ($ext === 'png' || $ext === 'jpg' || $ext === 'jpeg') {
                            return str_replace(['.png', '.jpg', '.jpeg'], '.webp', $data[0]);
                        }
                        return $data[0];
                    },
                    $imgTag
                );
            },
            $content
        );
    }

    /**
     * @throws QUI\Exception
     */
    protected function writeCacheFile(string $cacheFile, string $content): void
    {
        CacheFileWriter::write($cacheFile, $content);
    }

    public static function setLoggedInCookieIfEnabled(): void
    {
        if (!Config::isLoggedInCookieEnabled() || !self::canSendCookies()) {
            return;
        }

        $LoggedInCookie = new LoggedInCookie(Config::getLoggedInCookieName());

        setcookie(
            $LoggedInCookie->getName(),
            '1',
            time() + $LoggedInCookie->getLifetimeInSeconds(),
            '',
            '',
            true,
            true
        );
    }

    public static function removeLoggedInCookie(): void
    {
        if (!self::canSendCookies()) {
            return;
        }

        $LoggedInCookie = new LoggedInCookie(Config::getLoggedInCookieName());

        setcookie(
            $LoggedInCookie->getName(),
            '',
            1,
            '',
            '',
            true,
            true
        );
    }

    private static function canSendCookies(): bool
    {
        if (PHP_SAPI === 'cli' || PHP_SAPI === 'phpdbg') {
            return false;
        }

        return !headers_sent();
    }
}
