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<?php

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namespace Nextend\Framework\WordPress;

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use Nextend\Framework\Asset\AssetManager;

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use Nextend\Framework\Pattern\SingletonTrait;

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use Nextend\WordPress\OutputBuffer;

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class AssetInjector {

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use SingletonTrait;

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private static $cssComment = '';

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protected $js = '';

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protected $css = '';

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/**

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* @var OutputBuffer

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protected $outputBuffer;

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private $headTokens = array();

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private $useAlternativeAction = false;

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protected function init() {

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if (is_admin()) {

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$this->useAlternativeAction = true;

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}

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if (defined('WP_CLI') && WP_CLI) {

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//Do not start output buffering while WP_CLI active

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} else {

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$this->outputBuffer = OutputBuffer::getInstance();

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if (defined('SMART_SLIDER_OB_START') && SMART_SLIDER_OB_START >= 0) {

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$this->outputBuffer->setExtraObStart(SMART_SLIDER_OB_START);

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}

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$this->addInjectCSSComment();

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add_filter('wordpress_prepare_output', array(

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$this,

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'prepareOutput'

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));

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}

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}

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public function prepareOutput($buffer) {

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static $once = false;

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if (!$once) {

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$once = true;

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$this->finalizeCssJs();

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if (!empty($this->css)) {

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$n2cssPos = strpos($buffer, self::$cssComment);

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if ($n2cssPos !== false) {

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$buffer = substr_replace($buffer, $this->css, $n2cssPos, strlen(self::$cssComment));

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$this->css = '';

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} else {

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$parts = preg_split('/<\/head[\s]*>/i', $buffer, 2);

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// There might be no head and it would result a notice.

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if (count($parts) == 2) {

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list($head, $body) = $parts;

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/**

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* We must tokenize the HTML comments in the head to prepare for condition CSS/scripts

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* Eg.:

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$head = preg_replace_callback('//s', array(

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$this,

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'tokenizeHead'

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), $head);

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$head = preg_replace_callback('/<noscript>.*?<\/noscript>/s', array(

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$this,

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'tokenizeHead'

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), $head);

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$lastStylesheetPosition = strrpos($head, "<link rel='stylesheet'");

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if ($lastStylesheetPosition === false) {

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$lastStylesheetPosition = strrpos($head, "<link rel=\"stylesheet\"");

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if ($lastStylesheetPosition === false) {

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$lastStylesheetPosition = strrpos($head, "<link");

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}

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}

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if ($lastStylesheetPosition !== false) {

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/**

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* Find the end of the tag <link tag

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$lastStylesheetPositionEnd = strpos($head, ">", $lastStylesheetPosition);

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if ($lastStylesheetPositionEnd !== false) {

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/**

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* Insert CSS after the ending >

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$head = substr_replace($head, $this->css, $lastStylesheetPositionEnd + 1, 0);

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$this->css = '';

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/**

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* Restore HTML comments

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$head = preg_replace_callback('//', array(

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$this,

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'restoreHeadTokens'

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), $head);

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$buffer = $head . '</head>' . $body;

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}

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}

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}

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}

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}

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if ($this->css != '' || $this->js != '') {

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$parts = preg_split('/<\/head[\s]*>/', $buffer, 2);

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return implode($this->css . $this->js . '</head>', $parts);

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}

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}

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return $buffer;

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}

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public function tokenizeHead($matches) {

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$index = count($this->headTokens);

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$this->headTokens[$index] = $matches[0];

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return '';

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}

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public function restoreHeadTokens($matches) {

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return $this->headTokens[$matches[1]];

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}

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private function finalizeCssJs() {

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static $finalized = false;

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if (!$finalized) {

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$finalized = true;

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if (class_exists('\\Nextend\\Framework\\Asset\\AssetManager', false)) {

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$this->css = AssetManager::getCSS();

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$this->js = AssetManager::getJs();

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}

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}

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return true;

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}

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public function addInjectCSSComment() {

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if (!$this->useAlternativeAction) {

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add_action('wp_print_scripts', array(

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$this,

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'injectCSSComment'

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));

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} else {

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/**

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* @see SSDEV-3909

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* The Site editor fires the wp_print_scripts action inside a the wp.editSite.initializeEditor script.

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* The Widgets editor fires the wp_print_scripts action inside a the wp.editWidgets.initialize script.

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* The Customizer fires the wp_print_scripts action inside a the wp.customizeWidgets.initialize script.

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add_action('admin_head', array(

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$this,

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'injectCSSComment'

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));

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}

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}

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public function removeInjectCSSComment() {

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if (!$this->useAlternativeAction) {

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remove_action('wp_print_scripts', array(

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$this,

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'injectCSSComment'

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));

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} else {

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/**

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* @see SSDEV-3909

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* The Site editor fires the wp_print_scripts action inside a the wp.editSite.initializeEditor script.

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* The Widgets editor fires the wp_print_scripts action inside a the wp.editWidgets.initialize script.

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* The Customizer fires the wp_print_scripts action inside a the wp.customizeWidgets.initialize script.

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remove_action('admin_head', array(

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$this,

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'injectCSSComment'

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));

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}

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}

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public function injectCSSComment() {

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static $once;

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if (!$once) {

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echo wp_kses(self::$cssComment, array());

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$once = true;

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}

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}

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}

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