<?php

/**
 * The class to operate media data.
 *
 * @since 		1.4
 * @since  		1.5 Moved into /inc
 * @package    	Core
 * @subpackage 	Core/inc
 * @author     	LiteSpeed Technologies <info@litespeedtech.com>
 */

namespace LiteSpeed;

defined('WPINC') || exit();

class Media extends Root
{
	const LOG_TAG = '📺';

	const LIB_FILE_IMG_LAZYLOAD = 'assets/js/lazyload.min.js';

	private $content;
	private $_wp_upload_dir;
	private $_vpi_preload_list = array();

	/**
	 * Init
	 *
	 * @since  1.4
	 */
	public function __construct()
	{
		Debug2::debug2('[Media] init');

		$this->_wp_upload_dir = wp_upload_dir();
	}

	/**
	 * Init optm features
	 *
	 * @since  3.0
	 * @access public
	 */
	public function init()
	{
		if (is_admin()) {
			return;
		}

		// Due to ajax call doesn't send correct accept header, have to limit webp to HTML only
		if (defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) {
			if ($this->webp_support()) {
				// Hook to srcset
				if (function_exists('wp_calculate_image_srcset')) {
					add_filter('wp_calculate_image_srcset', array($this, 'webp_srcset'), 988);
				}
				// Hook to mime icon
				// add_filter( 'wp_get_attachment_image_src', array( $this, 'webp_attach_img_src' ), 988 );// todo: need to check why not
				// add_filter( 'wp_get_attachment_url', array( $this, 'webp_url' ), 988 ); // disabled to avoid wp-admin display
			}
		}

		if ($this->conf(Base::O_MEDIA_LAZY) && !$this->cls('Metabox')->setting('litespeed_no_image_lazy')) {
			self::debug('Suppress default WP lazyload');
			add_filter('wp_lazy_loading_enabled', '__return_false');
		}

		/**
		 * Replace gravatar
		 * @since  3.0
		 */
		$this->cls('Avatar');

		add_filter('litespeed_buffer_finalize', array($this, 'finalize'), 4);

		add_filter('litespeed_optm_html_head', array($this, 'finalize_head'));
	}

	/**
	 * Add featured image to head
	 */
	public function finalize_head($content)
	{
		global $wp_query;

		// <link rel="preload" as="image" href="xx">
		if ($this->_vpi_preload_list) {
			foreach ($this->_vpi_preload_list as $v) {
				$content .= '<link rel="preload" as="image" href="' . $v . '">';
			}
		}
		// 	$featured_image_url = get_the_post_thumbnail_url();
		// 	if ($featured_image_url) {
		// 		self::debug('Append featured image to head: ' . $featured_image_url);
		// 		if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) && $this->webp_support()) {
		// 			$featured_image_url = $this->replace_webp($featured_image_url) ?: $featured_image_url;
		// 		}
		// 	}
		// }

		return $content;
	}

	/**
	 * Adjust WP default JPG quality
	 *
	 * @since  3.0
	 * @access public
	 */
	public function adjust_jpg_quality($quality)
	{
		$v = $this->conf(Base::O_IMG_OPTM_JPG_QUALITY);

		if ($v) {
			return $v;
		}

		return $quality;
	}

	/**
	 * Register admin menu
	 *
	 * @since 1.6.3
	 * @access public
	 */
	public function after_admin_init()
	{
		/**
		 * JPG quality control
		 * @since  3.0
		 */
		add_filter('jpeg_quality', array($this, 'adjust_jpg_quality'));

		add_filter('manage_media_columns', array($this, 'media_row_title'));
		add_filter('manage_media_custom_column', array($this, 'media_row_actions'), 10, 2);

		add_action('litespeed_media_row', array($this, 'media_row_con'));

		// Hook to attachment delete action
		add_action('delete_attachment', __CLASS__ . '::delete_attachment');
	}

	/**
	 * Media delete action hook
	 *
	 * @since 2.4.3
	 * @access public
	 */
	public static function delete_attachment($post_id)
	{
		// if (!Data::cls()->tb_exist('img_optm')) {
		// return;
		// }

		self::debug('delete_attachment [pid] ' . $post_id);
		Img_Optm::cls()->reset_row($post_id);
	}

	/**
	 * Return media file info if exists
	 *
	 * This is for remote attachment plugins
	 *
	 * @since 2.9.8
	 * @access public
	 */
	public function info($short_file_path, $post_id)
	{
		$short_file_path = wp_normalize_path($short_file_path);
		$basedir = $this->_wp_upload_dir['basedir'] . '/';
		if (strpos($short_file_path, $basedir) === 0) {
			$short_file_path = substr($short_file_path, strlen($basedir));
		}

		$real_file = $basedir . $short_file_path;

		if (file_exists($real_file)) {
			return array(
				'url' => $this->_wp_upload_dir['baseurl'] . '/' . $short_file_path,
				'md5' => md5_file($real_file),
				'size' => filesize($real_file),
			);
		}

		/**
		 * WP Stateless compatibility #143 https://github.com/litespeedtech/lscache_wp/issues/143
		 * @since 2.9.8
		 * @return array( 'url', 'md5', 'size' )
		 */
		$info = apply_filters('litespeed_media_info', array(), $short_file_path, $post_id);
		if (!empty($info['url']) && !empty($info['md5']) && !empty($info['size'])) {
			return $info;
		}

		return false;
	}

	/**
	 * Delete media file
	 *
	 * @since 2.9.8
	 * @access public
	 */
	public function del($short_file_path, $post_id)
	{
		$real_file = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path;

		if (file_exists($real_file)) {
			unlink($real_file);
			self::debug('deleted ' . $real_file);
		}

		do_action('litespeed_media_del', $short_file_path, $post_id);
	}

	/**
	 * Rename media file
	 *
	 * @since 2.9.8
	 * @access public
	 */
	public function rename($short_file_path, $short_file_path_new, $post_id)
	{
		// self::debug('renaming ' . $short_file_path . ' -> ' . $short_file_path_new);
		$real_file = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path;
		$real_file_new = $this->_wp_upload_dir['basedir'] . '/' . $short_file_path_new;

		if (file_exists($real_file)) {
			rename($real_file, $real_file_new);
			self::debug('renamed ' . $real_file . ' to ' . $real_file_new);
		}

		do_action('litespeed_media_rename', $short_file_path, $short_file_path_new, $post_id);
	}

	/**
	 * Media Admin Menu -> Image Optimization Column Title
	 *
	 * @since 1.6.3
	 * @access public
	 */
	public function media_row_title($posts_columns)
	{
		$posts_columns['imgoptm'] = __('LiteSpeed Optimization', 'litespeed-cache');

		return $posts_columns;
	}

	/**
	 * Media Admin Menu -> Image Optimization Column
	 *
	 * @since 1.6.2
	 * @access public
	 */
	public function media_row_actions($column_name, $post_id)
	{
		if ($column_name !== 'imgoptm') {
			return;
		}

		do_action('litespeed_media_row', $post_id);
	}

	/**
	 * Display image optm info
	 *
	 * @since  3.0
	 */
	public function media_row_con($post_id)
	{
		$att_info = wp_get_attachment_metadata($post_id);
		if (empty($att_info['file'])) {
			return;
		}

		$short_path = $att_info['file'];

		$size_meta = get_post_meta($post_id, Img_Optm::DB_SIZE, true);

		echo '<p>';
		// Original image info
		if ($size_meta && !empty($size_meta['ori_saved'])) {
			$percent = ceil(($size_meta['ori_saved'] * 100) / $size_meta['ori_total']);

			$extension = pathinfo($short_path, PATHINFO_EXTENSION);
			$bk_file = substr($short_path, 0, -strlen($extension)) . 'bk.' . $extension;
			$bk_optm_file = substr($short_path, 0, -strlen($extension)) . 'bk.optm.' . $extension;

			$link = Utility::build_url(Router::ACTION_IMG_OPTM, 'orig' . $post_id);
			$desc = false;

			$cls = '';

			if ($this->info($bk_file, $post_id)) {
				$curr_status = __('(optm)', 'litespeed-cache');
				$desc = __('Currently using optimized version of file.', 'litespeed-cache') . '&#10;' . __('Click to switch to original (unoptimized) version.', 'litespeed-cache');
			} elseif ($this->info($bk_optm_file, $post_id)) {
				$cls .= ' litespeed-warning';
				$curr_status = __('(non-optm)', 'litespeed-cache');
				$desc = __('Currently using original (unoptimized) version of file.', 'litespeed-cache') . '&#10;' . __('Click to switch to optimized version.', 'litespeed-cache');
			}

			echo GUI::pie_tiny(
				$percent,
				24,
				sprintf(__('Original file reduced by %1$s (%2$s)', 'litespeed-cache'), $percent . '%', Utility::real_size($size_meta['ori_saved'])),
				'left'
			);

			echo sprintf(__('Orig saved %s', 'litespeed-cache'), $percent . '%');

			if ($desc) {
				echo sprintf(
					' <a href="%1$s" class="litespeed-media-href %2$s" data-balloon-pos="left" data-balloon-break aria-label="%3$s">%4$s</a>',
					$link,
					$cls,
					$desc,
					$curr_status
				);
			} else {
				echo sprintf(
					' <span class="litespeed-desc" data-balloon-pos="left" data-balloon-break aria-label="%1$s">%2$s</span>',
					__('Using optimized version of file. ', 'litespeed-cache') . '&#10;' . __('No backup of original file exists.', 'litespeed-cache'),
					__('(optm)', 'litespeed-cache')
				);
			}
		} elseif ($size_meta && $size_meta['ori_saved'] === 0) {
			echo GUI::pie_tiny(0, 24, __('Congratulation! Your file was already optimized', 'litespeed-cache'), 'left');
			echo sprintf(__('Orig %s', 'litespeed-cache'), '<span class="litespeed-desc">' . __('(no savings)', 'litespeed-cache') . '</span>');
		} else {
			echo __('Orig', 'litespeed-cache') . '<span class="litespeed-left10">—</span>';
		}
		echo '</p>';

		echo '<p>';
		// WebP info
		if ($size_meta && !empty($size_meta['webp_saved'])) {
			$percent = ceil(($size_meta['webp_saved'] * 100) / $size_meta['webp_total']);

			$link = Utility::build_url(Router::ACTION_IMG_OPTM, 'webp' . $post_id);
			$desc = false;

			$cls = '';

			if ($this->info($short_path . '.webp', $post_id)) {
				$curr_status = __('(optm)', 'litespeed-cache');
				$desc =
					__('Currently using optimized version of WebP file.', 'litespeed-cache') .
					'&#10;' .
					__('Click to switch to original (unoptimized) version.', 'litespeed-cache');
			} elseif ($this->info($short_path . '.optm.webp', $post_id)) {
				$cls .= ' litespeed-warning';
				$curr_status = __('(non-optm)', 'litespeed-cache');
				$desc =
					__('Currently using original (unoptimized) version of WebP file.', 'litespeed-cache') .
					'&#10;' .
					__('Click to switch to optimized version.', 'litespeed-cache');
			}

			echo GUI::pie_tiny(
				$percent,
				24,
				sprintf(__('WebP file reduced by %1$s (%2$s)', 'litespeed-cache'), $percent . '%', Utility::real_size($size_meta['webp_saved'])),
				'left'
			);
			echo sprintf(__('WebP saved %s', 'litespeed-cache'), $percent . '%');

			if ($desc) {
				echo sprintf(
					' <a href="%1$s" class="litespeed-media-href %2$s" data-balloon-pos="left" data-balloon-break aria-label="%3$s">%4$s</a>',
					$link,
					$cls,
					$desc,
					$curr_status
				);
			} else {
				echo sprintf(
					' <span class="litespeed-desc" data-balloon-pos="left" data-balloon-break aria-label="%1$s">%2$s</span>',
					__('Using optimized version of file. ', 'litespeed-cache') . '&#10;' . __('No backup of unoptimized WebP file exists.', 'litespeed-cache'),
					__('(optm)', 'litespeed-cache')
				);
			}
		} else {
			echo __('WebP', 'litespeed-cache') . '<span class="litespeed-left10">—</span>';
		}

		echo '</p>';

		// Delete row btn
		if ($size_meta) {
			echo sprintf(
				'<div class="row-actions"><span class="delete"><a href="%1$s" class="">%2$s</a></span></div>',
				Utility::build_url(Router::ACTION_IMG_OPTM, Img_Optm::TYPE_RESET_ROW, false, null, array('id' => $post_id)),
				__('Restore from backup', 'litespeed-cache')
			);
			echo '</div>';
		}
	}

	/**
	 * Get wp size info
	 *
	 * NOTE: this is not used because it has to be after admin_init
	 *
	 * @since 1.6.2
	 * @return array $sizes Data for all currently-registered image sizes.
	 */
	public function get_image_sizes()
	{
		global $_wp_additional_image_sizes;
		$sizes = array();

		foreach (get_intermediate_image_sizes() as $_size) {
			if (in_array($_size, array('thumbnail', 'medium', 'medium_large', 'large'))) {
				$sizes[$_size]['width'] = get_option($_size . '_size_w');
				$sizes[$_size]['height'] = get_option($_size . '_size_h');
				$sizes[$_size]['crop'] = (bool) get_option($_size . '_crop');
			} elseif (isset($_wp_additional_image_sizes[$_size])) {
				$sizes[$_size] = array(
					'width' => $_wp_additional_image_sizes[$_size]['width'],
					'height' => $_wp_additional_image_sizes[$_size]['height'],
					'crop' => $_wp_additional_image_sizes[$_size]['crop'],
				);
			}
		}

		return $sizes;
	}

	/**
	 * Exclude role from optimization filter
	 *
	 * @since  1.6.2
	 * @access public
	 */
	public function webp_support()
	{
		if (!empty($_SERVER['HTTP_ACCEPT']) && strpos($_SERVER['HTTP_ACCEPT'], 'image/webp') !== false) {
			return true;
		}

		if (!empty($_SERVER['HTTP_USER_AGENT'])) {
			$user_agents = array('chrome-lighthouse', 'googlebot', 'page speed');
			foreach ($user_agents as $user_agent) {
				if (stripos($_SERVER['HTTP_USER_AGENT'], $user_agent) !== false) {
					return true;
				}
			}

			if (preg_match('/iPhone OS (\d+)_/i', $_SERVER['HTTP_USER_AGENT'], $matches)) {
				$lscwp_ios_version = $matches[1];
				if ($lscwp_ios_version >= 14) {
					return true;
				}
			}
		}

		return false;
	}

	/**
	 * Run lazy load process
	 * NOTE: As this is after cache finalized, can NOT set any cache control anymore
	 *
	 * Only do for main page. Do NOT do for esi or dynamic content.
	 *
	 * @since  1.4
	 * @access public
	 * @return  string The buffer
	 */
	public function finalize($content)
	{
		if (defined('LITESPEED_NO_LAZY')) {
			Debug2::debug2('[Media] bypass: NO_LAZY const');
			return $content;
		}

		if (!defined('LITESPEED_IS_HTML')) {
			Debug2::debug2('[Media] bypass: Not frontend HTML type');
			return $content;
		}

		if (!Control::is_cacheable()) {
			self::debug('bypass: Not cacheable');
			return $content;
		}

		self::debug('finalize');

		$this->content = $content;
		$this->_finalize();
		return $this->content;
	}

	/**
	 * Run lazyload replacement for images in buffer
	 *
	 * @since  1.4
	 * @access private
	 */
	private function _finalize()
	{
		/**
		 * Use webp for optimized images
		 * @since 1.6.2
		 */
		if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) && $this->webp_support()) {
			$this->content = $this->_replace_buffer_img_webp($this->content);
		}

		/**
		 * Check if URI is excluded
		 * @since  3.0
		 */
		$excludes = $this->conf(Base::O_MEDIA_LAZY_URI_EXC);
		if (!defined('LITESPEED_GUEST_OPTM')) {
			$result = Utility::str_hit_array($_SERVER['REQUEST_URI'], $excludes);
			if ($result) {
				self::debug('bypass lazyload: hit URI Excludes setting: ' . $result);
				return;
			}
		}

		$cfg_lazy = (defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_MEDIA_LAZY)) && !$this->cls('Metabox')->setting('litespeed_no_image_lazy');
		$cfg_iframe_lazy = defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_MEDIA_IFRAME_LAZY);
		$cfg_js_delay = defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_OPTM_JS_DEFER) == 2;
		$cfg_trim_noscript = defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_OPTM_NOSCRIPT_RM);
		$cfg_vpi = defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_MEDIA_VPI);

		// Preload VPI
		if ($cfg_vpi) {
			$this->_parse_img_for_preload();
		}

		if ($cfg_lazy) {
			if ($cfg_vpi) {
				add_filter('litespeed_media_lazy_img_excludes', array($this->cls('Metabox'), 'lazy_img_excludes'));
			}
			list($src_list, $html_list, $placeholder_list) = $this->_parse_img();
			$html_list_ori = $html_list;
		} else {
			self::debug('lazyload disabled');
		}

		// image lazy load
		if ($cfg_lazy) {
			$__placeholder = Placeholder::cls();

			foreach ($html_list as $k => $v) {
				$size = $placeholder_list[$k];
				$src = $src_list[$k];

				$html_list[$k] = $__placeholder->replace($v, $src, $size);
			}
		}

		if ($cfg_lazy) {
			$this->content = str_replace($html_list_ori, $html_list, $this->content);
		}

		// iframe lazy load
		if ($cfg_iframe_lazy) {
			$html_list = $this->_parse_iframe();
			$html_list_ori = $html_list;

			foreach ($html_list as $k => $v) {
				$snippet = $cfg_trim_noscript ? '' : '<noscript>' . $v . '</noscript>';
				if ($cfg_js_delay) {
					$v = str_replace(' src=', ' data-litespeed-src=', $v);
				} else {
					$v = str_replace(' src=', ' data-src=', $v);
				}
				$v = str_replace('<iframe ', '<iframe data-lazyloaded="1" src="about:blank" ', $v);
				$snippet = $v . $snippet;

				$html_list[$k] = $snippet;
			}

			$this->content = str_replace($html_list_ori, $html_list, $this->content);
		}

		// Include lazyload lib js and init lazyload
		if ($cfg_lazy || $cfg_iframe_lazy) {
			$lazy_lib = '<script data-no-optimize="1">' . File::read(LSCWP_DIR . self::LIB_FILE_IMG_LAZYLOAD) . '</script>';
			$this->content = str_replace('</body>', $lazy_lib . '</body>', $this->content);
		}
	}

	/**
	 * Parse img src for VPI preload only
	 * Note: Didn't reuse the _parse_img() bcoz it contains parent cls replacement and other logic which is not needed for preload
	 *
	 * @since 6.2
	 */
	private function _parse_img_for_preload()
	{
		// Load VPI setting
		$is_mobile = $this->_separate_mobile();
		$vpi_files = $this->cls('Metabox')->setting($is_mobile ? 'litespeed_vpi_list_mobile' : 'litespeed_vpi_list');
		if ($vpi_files) {
			$vpi_files = Utility::sanitize_lines($vpi_files, 'basename');
		}
		if (!$vpi_files) {
			return;
		}

		$content = preg_replace(array('#<!--.*-->#sU', '#<noscript([^>]*)>.*</noscript>#isU'), '', $this->content);
		preg_match_all('#<img\s+([^>]+)/?>#isU', $content, $matches, PREG_SET_ORDER);
		foreach ($matches as $match) {
			$attrs = Utility::parse_attr($match[1]);

			if (empty($attrs['src'])) {
				continue;
			}

			if (strpos($attrs['src'], 'base64') !== false || substr($attrs['src'], 0, 5) === 'data:') {
				Debug2::debug2('[Media] lazyload bypassed base64 img');
				continue;
			}

			if (strpos($attrs['src'], '{') !== false) {
				Debug2::debug2('[Media] image src has {} ' . $attrs['src']);
				continue;
			}

			// If the src contains VPI filename, then preload it
			if (!Utility::str_hit_array($attrs['src'], $vpi_files)) {
				continue;
			}

			Debug2::debug2('[Media] VPI preload found and matched: ' . $attrs['src']);

			$this->_vpi_preload_list[] = $attrs['src'];
		}
	}

	/**
	 * Parse img src
	 *
	 * @since  1.4
	 * @access private
	 * @return array  All the src & related raw html list
	 */
	private function _parse_img()
	{
		/**
		 * Exclude list
		 * @since 1.5
		 * @since  2.7.1 Changed to array
		 */
		$excludes = apply_filters('litespeed_media_lazy_img_excludes', $this->conf(Base::O_MEDIA_LAZY_EXC));

		$cls_excludes = apply_filters('litespeed_media_lazy_img_cls_excludes', $this->conf(Base::O_MEDIA_LAZY_CLS_EXC));
		$cls_excludes[] = 'skip-lazy'; // https://core.trac.wordpress.org/ticket/44427

		$src_list = array();
		$html_list = array();
		$placeholder_list = array();

		$content = preg_replace(
			array(
				'#<!--.*-->#sU',
				'#<noscript([^>]*)>.*</noscript>#isU',
				'#<script([^>]*)>.*</script>#isU', // Added to remove warning of file not found when image size detection is turned ON.
			),
			'',
			$this->content
		);
		/**
		 * Exclude parent classes
		 * @since  3.0
		 */
		$parent_cls_exc = apply_filters('litespeed_media_lazy_img_parent_cls_excludes', $this->conf(Base::O_MEDIA_LAZY_PARENT_CLS_EXC));
		if ($parent_cls_exc) {
			Debug2::debug2('[Media] Lazyload Class excludes', $parent_cls_exc);
			foreach ($parent_cls_exc as $v) {
				$content = preg_replace('#<(\w+) [^>]*class=(\'|")[^\'"]*' . preg_quote($v, '#') . '[^\'"]*\2[^>]*>.*</\1>#sU', '', $content);
			}
		}

		preg_match_all('#<img\s+([^>]+)/?>#isU', $content, $matches, PREG_SET_ORDER);
		foreach ($matches as $match) {
			$attrs = Utility::parse_attr($match[1]);

			if (empty($attrs['src'])) {
				continue;
			}

			/**
			 * Add src validation to bypass base64 img src
			 * @since  1.6
			 */
			if (strpos($attrs['src'], 'base64') !== false || substr($attrs['src'], 0, 5) === 'data:') {
				Debug2::debug2('[Media] lazyload bypassed base64 img');
				continue;
			}

			Debug2::debug2('[Media] lazyload found: ' . $attrs['src']);

			if (
				!empty($attrs['data-no-lazy']) ||
				!empty($attrs['data-skip-lazy']) ||
				!empty($attrs['data-lazyloaded']) ||
				!empty($attrs['data-src']) ||
				!empty($attrs['data-srcset'])
			) {
				Debug2::debug2('[Media] bypassed');
				continue;
			}

			if (!empty($attrs['class']) && ($hit = Utility::str_hit_array($attrs['class'], $cls_excludes))) {
				Debug2::debug2('[Media] lazyload image cls excludes [hit] ' . $hit);
				continue;
			}

			/**
			 * Exclude from lazyload by setting
			 * @since  1.5
			 */
			if ($excludes && Utility::str_hit_array($attrs['src'], $excludes)) {
				Debug2::debug2('[Media] lazyload image exclude ' . $attrs['src']);
				continue;
			}

			/**
			 * Excldues invalid image src from buddypress avatar crop
			 * @see  https://wordpress.org/support/topic/lazy-load-breaking-buddypress-upload-avatar-feature
			 * @since  3.0
			 */
			if (strpos($attrs['src'], '{') !== false) {
				Debug2::debug2('[Media] image src has {} ' . $attrs['src']);
				continue;
			}

			// to avoid multiple replacement
			if (in_array($match[0], $html_list)) {
				continue;
			}

			// Add missing dimensions
			if (defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_MEDIA_ADD_MISSING_SIZES)) {
				if (!apply_filters('litespeed_media_add_missing_sizes', true)) {
					Debug2::debug2('[Media] add_missing_sizes bypassed via litespeed_media_add_missing_sizes filter');
				} elseif (empty($attrs['width']) || $attrs['width'] == 'auto' || empty($attrs['height']) || $attrs['height'] == 'auto') {
					self::debug('⚠️ Missing sizes for image [src] ' . $attrs['src']);
					$dimensions = $this->_detect_dimensions($attrs['src']);
					if ($dimensions) {
						$ori_width = $dimensions[0];
						$ori_height = $dimensions[1];
						// Calculate height based on width
						if (!empty($attrs['width']) && $attrs['width'] != 'auto') {
							$ori_height = intval(($ori_height * $attrs['width']) / $ori_width);
						} elseif (!empty($attrs['height']) && $attrs['height'] != 'auto') {
							$ori_width = intval(($ori_width * $attrs['height']) / $ori_height);
						}

						$attrs['width'] = $ori_width;
						$attrs['height'] = $ori_height;
						$new_html = preg_replace('#\s+(width|height)=(["\'])[^\2]*?\2#', '', $match[0]);
						$new_html = preg_replace('#<img\s+#i', '<img width="' . $attrs['width'] . '" height="' . $attrs['height'] . '" ', $new_html);
						self::debug('Add missing sizes ' . $attrs['width'] . 'x' . $attrs['height'] . ' to ' . $attrs['src']);
						$this->content = str_replace($match[0], $new_html, $this->content);
						$match[0] = $new_html;
					}
				}
			}

			$placeholder = false;
			if (!empty($attrs['width']) && $attrs['width'] != 'auto' && !empty($attrs['height']) && $attrs['height'] != 'auto') {
				$placeholder = intval($attrs['width']) . 'x' . intval($attrs['height']);
			}

			$src_list[] = $attrs['src'];
			$html_list[] = $match[0];
			$placeholder_list[] = $placeholder;
		}

		return array($src_list, $html_list, $placeholder_list);
	}

	/**
	 * Detect the original sizes
	 *
	 * @since  4.0
	 */
	private function _detect_dimensions($src)
	{
		if ($pathinfo = Utility::is_internal_file($src)) {
			$src = $pathinfo[0];
		} elseif (apply_filters('litespeed_media_ignore_remote_missing_sizes', false)) {
			return false;
		}

		if (substr($src, 0, 2) == '//') {
			$src = 'https:' . $src;
		}

		try {
			$sizes = getimagesize($src);
		} catch (\Exception $e) {
			return false;
		}

		if (!empty($sizes[0]) && !empty($sizes[1])) {
			return $sizes;
		}

		return false;
	}

	/**
	 * Parse iframe src
	 *
	 * @since  1.4
	 * @access private
	 * @return array  All the src & related raw html list
	 */
	private function _parse_iframe()
	{
		$cls_excludes = apply_filters('litespeed_media_iframe_lazy_cls_excludes', $this->conf(Base::O_MEDIA_IFRAME_LAZY_CLS_EXC));
		$cls_excludes[] = 'skip-lazy'; // https://core.trac.wordpress.org/ticket/44427

		$html_list = array();

		$content = preg_replace('#<!--.*-->#sU', '', $this->content);

		/**
		 * Exclude parent classes
		 * @since  3.0
		 */
		$parent_cls_exc = apply_filters('litespeed_media_iframe_lazy_parent_cls_excludes', $this->conf(Base::O_MEDIA_IFRAME_LAZY_PARENT_CLS_EXC));
		if ($parent_cls_exc) {
			Debug2::debug2('[Media] Iframe Lazyload Class excludes', $parent_cls_exc);
			foreach ($parent_cls_exc as $v) {
				$content = preg_replace('#<(\w+) [^>]*class=(\'|")[^\'"]*' . preg_quote($v, '#') . '[^\'"]*\2[^>]*>.*</\1>#sU', '', $content);
			}
		}

		preg_match_all('#<iframe \s*([^>]+)></iframe>#isU', $content, $matches, PREG_SET_ORDER);
		foreach ($matches as $match) {
			$attrs = Utility::parse_attr($match[1]);

			if (empty($attrs['src'])) {
				continue;
			}

			Debug2::debug2('[Media] found iframe: ' . $attrs['src']);

			if (!empty($attrs['data-no-lazy']) || !empty($attrs['data-skip-lazy']) || !empty($attrs['data-lazyloaded']) || !empty($attrs['data-src'])) {
				Debug2::debug2('[Media] bypassed');
				continue;
			}

			if (!empty($attrs['class']) && ($hit = Utility::str_hit_array($attrs['class'], $cls_excludes))) {
				Debug2::debug2('[Media] iframe lazyload cls excludes [hit] ' . $hit);
				continue;
			}

			if (apply_filters('litespeed_iframe_lazyload_exc', false, $attrs['src'])) {
				Debug2::debug2('[Media] bypassed by filter');
				continue;
			}

			// to avoid multiple replacement
			if (in_array($match[0], $html_list)) {
				continue;
			}

			$html_list[] = $match[0];
		}

		return $html_list;
	}

	/**
	 * Replace image src to webp
	 *
	 * @since  1.6.2
	 * @access private
	 */
	private function _replace_buffer_img_webp($content)
	{
		/**
		 * Added custom element & attribute support
		 * @since 2.2.2
		 */
		$webp_ele_to_check = $this->conf(Base::O_IMG_OPTM_WEBP_ATTR);

		foreach ($webp_ele_to_check as $v) {
			if (!$v || strpos($v, '.') === false) {
				Debug2::debug2('[Media] buffer_webp no . attribute ' . $v);
				continue;
			}

			Debug2::debug2('[Media] buffer_webp attribute ' . $v);

			$v = explode('.', $v);
			$attr = preg_quote($v[1], '#');
			if ($v[0]) {
				$pattern = '#<' . preg_quote($v[0], '#') . '([^>]+)' . $attr . '=([\'"])(.+)\2#iU';
			} else {
				$pattern = '# ' . $attr . '=([\'"])(.+)\1#iU';
			}

			preg_match_all($pattern, $content, $matches);

			foreach ($matches[$v[0] ? 3 : 2] as $k2 => $url) {
				// Check if is a DATA-URI
				if (strpos($url, 'data:image') !== false) {
					continue;
				}

				if (!($url2 = $this->replace_webp($url))) {
					continue;
				}

				if ($v[0]) {
					$html_snippet = sprintf('<' . $v[0] . '%1$s' . $v[1] . '=%2$s', $matches[1][$k2], $matches[2][$k2] . $url2 . $matches[2][$k2]);
				} else {
					$html_snippet = sprintf(' ' . $v[1] . '=%1$s', $matches[1][$k2] . $url2 . $matches[1][$k2]);
				}

				$content = str_replace($matches[0][$k2], $html_snippet, $content);
			}
		}

		// parse srcset
		// todo: should apply this to cdn too
		if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP_REPLACE_SRCSET)) && $this->webp_support()) {
			$content = Utility::srcset_replace($content, array($this, 'replace_webp'));
		}

		// Replace background-image
		if ((defined('LITESPEED_GUEST_OPTM') || $this->conf(Base::O_IMG_OPTM_WEBP)) && $this->webp_support()) {
			$content = $this->replace_background_webp($content);
		}

		return $content;
	}

	/**
	 * Replace background image
	 *
	 * @since  4.0
	 */
	public function replace_background_webp($content)
	{
		Debug2::debug2('[Media] Start replacing bakcground WebP.');

		// Handle Elementors data-settings json encode background-images
		$content = $this->replace_urls_in_json($content);

		// preg_match_all( '#background-image:(\s*)url\((.*)\)#iU', $content, $matches );
		preg_match_all('#url\(([^)]+)\)#iU', $content, $matches);
		foreach ($matches[1] as $k => $url) {
			// Check if is a DATA-URI
			if (strpos($url, 'data:image') !== false) {
				continue;
			}

			/**
			 * Support quotes in src `background-image: url('src')`
			 * @since 2.9.3
			 */
			$url = trim($url, '\'"');

			// Fix Elementors Slideshow unusual background images like  style="background-image: url(&quot;https://xxxx.png&quot;);"
			if (strpos($url, '&quot;') === 0 && substr($url, -6) == '&quot;') {
				$url = substr($url, 6, -6);
			}

			if (!($url2 = $this->replace_webp($url))) {
				continue;
			}

			// $html_snippet = sprintf( 'background-image:%1$surl(%2$s)', $matches[ 1 ][ $k ], $url2 );
			$html_snippet = str_replace($url, $url2, $matches[0][$k]);
			$content = str_replace($matches[0][$k], $html_snippet, $content);
		}

		return $content;
	}

	/**
	 * Replace images in json data settings attributes
	 *
	 * @since  6.2
	 */
	public function replace_urls_in_json($content)
	{
		$pattern = '/data-settings="(.*?)"/i';
		$parent_class = $this;

		preg_match_all($pattern, $content, $matches, PREG_SET_ORDER);

		foreach ($matches as $match) {
			// Check if the string contains HTML entities
			$isEncoded = preg_match('/&quot;|&lt;|&gt;|&amp;|&apos;/', $match[1]);

			// Decode HTML entities in the JSON string
			$jsonString = html_entity_decode($match[1]);

			$jsonData = \json_decode($jsonString, true);

			if (json_last_error() === JSON_ERROR_NONE) {
				$did_webp_replace = false;

				array_walk_recursive($jsonData, function (&$item, $key) use (&$did_webp_replace, $parent_class) {
					if ($key == 'url') {
						$item_image = $parent_class->replace_webp($item);
						if ($item_image) {
							$item = $item_image;

							$did_webp_replace = true;
						}
					}
				});

				if ($did_webp_replace) {
					// Re-encode the modified array back to a JSON string
					$newJsonString = \json_encode($jsonData);

					// Re-encode the JSON string to HTML entities only if it was originally encoded
					if ($isEncoded) {
						$newJsonString = htmlspecialchars($newJsonString, ENT_QUOTES | 0); // ENT_HTML401 is for PHPv5.4+
					}

					// Replace the old JSON string in the content with the new, modified JSON string
					$content = str_replace($match[1], $newJsonString, $content);
				}
			}
		}

		return $content;
	}

	/**
	 * Replace internal image src to webp
	 *
	 * @since  1.6.2
	 * @access public
	 */
	public function replace_webp($url)
	{
		Debug2::debug2('[Media] webp replacing: ' . substr($url, 0, 200));

		if (substr($url, -5) == '.webp') {
			Debug2::debug2('[Media] already webp');
			return false;
		}

		/**
		 * WebP API hook
		 * NOTE: As $url may contain query strings, WebP check will need to parse_url before appending .webp
		 * @since  2.9.5
		 * @see  #751737 - API docs for WebP generation
		 */
		if (apply_filters('litespeed_media_check_ori', Utility::is_internal_file($url), $url)) {
			// check if has webp file
			if (apply_filters('litespeed_media_check_webp', Utility::is_internal_file($url, 'webp'), $url)) {
				$url .= '.webp';
			} else {
				Debug2::debug2('[Media] -no WebP file, bypassed');
				return false;
			}
		} else {
			Debug2::debug2('[Media] -no file, bypassed');
			return false;
		}

		Debug2::debug2('[Media] - replaced to: ' . $url);

		return $url;
	}

	/**
	 * Hook to wp_get_attachment_image_src
	 *
	 * @since  1.6.2
	 * @access public
	 * @param  array $img The URL of the attachment image src, the width, the height
	 * @return array
	 */
	public function webp_attach_img_src($img)
	{
		Debug2::debug2('[Media] changing attach src: ' . $img[0]);
		if ($img && ($url = $this->replace_webp($img[0]))) {
			$img[0] = $url;
		}
		return $img;
	}

	/**
	 * Try to replace img url
	 *
	 * @since  1.6.2
	 * @access public
	 * @param  string $url
	 * @return string
	 */
	public function webp_url($url)
	{
		if ($url && ($url2 = $this->replace_webp($url))) {
			$url = $url2;
		}
		return $url;
	}

	/**
	 * Hook to replace WP responsive images
	 *
	 * @since  1.6.2
	 * @access public
	 * @param  array $srcs
	 * @return array
	 */
	public function webp_srcset($srcs)
	{
		if ($srcs) {
			foreach ($srcs as $w => $data) {
				if (!($url = $this->replace_webp($data['url']))) {
					continue;
				}
				$srcs[$w]['url'] = $url;
			}
		}
		return $srcs;
	}
}
