<?php
// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Unified Frontend HTML & Core Web Vitals Speed Pipeline (v3.0.9 Turbo Suite)
 * Handles Critical CSS, Async Render-Blocking CSS, Async Google Fonts,
 * Smart LCP, Full-Site Auto Image & SVG Dimensions (CLS), CSS Background LazyLoad,
 * YouTube Smart Facade, Delay JS Execution (TBT/INP), CDN URL Rewriting,
 * Instant Page Speculation Rules, and Safe HTML Minification in a single pass.
 */
class AIO_Speed_HTML {

	private $options;
	private $dims_cache       = null;
	private $dims_cache_dirty = false;
	private $webp_url_cache   = array();
	private $site_host        = '';
	private $home_path_prefix = '';

	public function __construct() {
		if ( aio_is_speed_safe_mode() ) {
			return;
		}

		$this->options          = get_option( 'aio_options', array() );
		$this->site_host        = strtolower( (string) wp_parse_url( home_url(), PHP_URL_HOST ) );
		$this->home_path_prefix = rtrim( (string) wp_parse_url( home_url( '/' ), PHP_URL_PATH ), '/' );

		if ( ! empty( $this->options['optEnableSmartLcp'] ) ) {
			add_action( 'wp_head', array( $this, 'output_lcp_featured_preload' ), 1 );
		}

		if ( ! empty( $this->options['optCriticalCss'] ) ) {
			add_action( 'wp_head', array( $this, 'output_critical_css' ), 2 );
		}

		if ( ! empty( $this->options['optEnableInstantPage'] ) ) {
			add_action( 'wp_footer', array( $this, 'output_instant_page_prefetch' ), 99 );
		}

		if ( $this->needs_html_buffer() ) {
			add_action( 'template_redirect', array( $this, 'start_html_buffer' ), 1 );
		}
	}

	private function needs_html_buffer() {
		$keys = array(
			'optEnableSmartLcp',
			'opt-perf-lazyload',
			'optLazyLoadBg',
			'optEnableAutoImageDims',
			'optEnableWebpRewrite',
			'optEnableFontSwap',
			'optAsyncGoogleFonts',
			'optSelfHostGoogleFonts',
			'optEnableAsyncCss',
			'optEnableYoutubeFacade',
			'optEnableDelayJS',
			'optEnableCdn',
			'optEnableMinify',
		);

		foreach ( $keys as $key ) {
			if ( ! empty( $this->options[ $key ] ) ) {
				return true;
			}
		}

		return false;
	}

	private function is_optimizable_request() {
		if ( is_admin() || aio_is_speed_safe_mode() ) {
			return false;
		}
		if ( ( function_exists( 'wp_doing_ajax' ) && wp_doing_ajax() ) || ( function_exists( 'wp_doing_cron' ) && wp_doing_cron() ) ) {
			return false;
		}
		if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) {
			return false;
		}
		if ( defined( 'XMLRPC_REQUEST' ) && XMLRPC_REQUEST ) {
			return false;
		}
		if ( is_feed() || is_preview() || is_customize_preview() || is_robots() || is_trackback() ) {
			return false;
		}
		if ( get_query_var( 'aio_sitemap' ) ) {
			return false;
		}
		if ( is_user_logged_in() ) {
			return false;
		}

		return true;
	}

	public function output_lcp_featured_preload() {
		if ( is_admin() || aio_is_speed_safe_mode() || ! is_singular() ) {
			return;
		}

		$post_id = get_queried_object_id();
		if ( ! $post_id ) {
			return;
		}

		$thumb_id      = 0;
		$size          = 'large';
		$sizes         = '';
		$is_section_bg = false;

		if ( is_page() ) {
			$post_obj = get_post( $post_id );
			$content  = $post_obj ? (string) $post_obj->post_content : '';
			if ( preg_match( '/\[section\b([^\]]*)\bbg=["\']?(\d+)["\']?([^\]]*)\]/i', substr( $content, 0, 1500 ), $m ) ) {
				$thumb_id      = (int) $m[2];
				$sec_attrs     = $m[1] . ' ' . $m[3];
				$size          = 'full';
				if ( preg_match( '/\bbg_size=["\']?([a-z0-9_-]+)["\']?/i', $sec_attrs, $sm ) && strtolower( $sm[1] ) !== 'original' ) {
					$size = strtolower( $sm[1] );
				}
				$is_section_bg = true;
			} else {
				return;
			}
		} else {
			if ( ! has_post_thumbnail( $post_id ) ) {
				return;
			}
			$thumb_id = (int) get_post_thumbnail_id( $post_id );
		}

		if ( ! $thumb_id ) {
			return;
		}

		$src = wp_get_attachment_image_url( $thumb_id, $size );
		if ( empty( $src ) ) {
			return;
		}

		$srcset = $is_section_bg ? '' : wp_get_attachment_image_srcset( $thumb_id, $size );
		if ( ! $is_section_bg && '' === $sizes ) {
			$sizes = (string) wp_get_attachment_image_sizes( $thumb_id, $size );
		}

		if ( ! empty( $this->options['optEnableWebpRewrite'] ) || ! empty( $this->options['opt-perf-webp'] ) ) {
			$src = $this->maybe_rewrite_url_to_webp( $src );
			if ( ! empty( $srcset ) ) {
				$srcset = $this->maybe_rewrite_srcset_to_webp( $srcset );
			}
		}

		echo '<link rel="preload" as="image" href="' . esc_url( $src ) . '"';
		if ( ! empty( $srcset ) ) {
			echo ' imagesrcset="' . esc_attr( $srcset ) . '"';
		}
		if ( ! empty( $sizes ) ) {
			echo ' imagesizes="' . esc_attr( $sizes ) . '"';
		}
		echo ' fetchpriority="high">' . "\n";
	}

	/**
	 * Output user-configured Above-the-Fold Critical CSS early in <head>.
	 */
	public function output_critical_css() {
		if ( ! $this->is_optimizable_request() ) {
			return;
		}
		$css = trim( (string) $this->options['optCriticalCss'] );
		if ( $css === '' ) {
			return;
		}
		// Prevent any accidental </style> breakout inside user CSS
		$safe_css = preg_replace( '#</\s*style#i', '', $css );
		echo '<style id="aio-critical-css">' . $safe_css . '</style>' . "\n"; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
	}

	public function output_instant_page_prefetch() {
		if ( ! $this->is_optimizable_request() ) {
			return;
		}

		$rules = array(
			'prefetch' => array(
				array(
					'source'    => 'document',
					'where'     => array(
						'and' => array(
							array( 'href_matches' => '/*' ),
							array(
								'not' => array(
									'href_matches' => array(
										'/wp-admin/*',
										'/wp-login.php*',
										'/*add-to-cart=*',
										'/*remove_item=*',
										'/*logout*',
										'/cart/*',
										'/checkout/*',
										'/my-account/*',
										'/gio-hang/*',
										'/thanh-toan/*',
										'/tai-khoan/*',
										'/*\\?*',
									),
								),
							),
							array(
								'not' => array(
									'selector_matches' => '.no-prefetch, [download], [rel~=nofollow], .add_to_cart_button, .ajax_add_to_cart',
								),
							),
						),
					),
					'eagerness' => 'moderate',
				),
			),
		);

		echo '<script type="speculationrules">' . wp_json_encode( $rules, JSON_UNESCAPED_SLASHES | JSON_HEX_TAG ) . '</script>' . "\n";
		?>
<script id="aio-instant-page-js" data-aio-no-delay="1">
(function(){if(window.HTMLScriptElement&&HTMLScriptElement.supports&&HTMLScriptElement.supports('speculationrules'))return;var seen={},count=0,timer=null;function ok(a){if(!a||!a.href||count>=15||seen[a.href])return false;if(a.target==='_blank'||a.hasAttribute('download')||(a.rel&&a.rel.indexOf('nofollow')!==-1))return false;if(a.origin!==location.origin||a.pathname===location.pathname||a.search)return false;if(/\/(wp-admin|wp-login\.php|cart|checkout|my-account|gio-hang|thanh-toan)/i.test(a.pathname))return false;return true;}function pre(u){if(seen[u]||count>=15)return;seen[u]=1;count++;var l=document.createElement('link');l.rel='prefetch';l.href=u;document.head.appendChild(l);}document.addEventListener('mouseover',function(e){var a=e.target&&e.target.closest?e.target.closest('a'):null;if(!ok(a))return;clearTimeout(timer);timer=setTimeout(function(){pre(a.href);},90);},{passive:true});document.addEventListener('touchstart',function(e){var a=e.target&&e.target.closest?e.target.closest('a'):null;if(ok(a))pre(a.href);},{passive:true});})();
</script>
		<?php
	}

	public function start_html_buffer() {
		if ( $this->is_optimizable_request() ) {
			ob_start( array( $this, 'transform_html' ) );
		}
	}

	/**
	 * Main single-pass HTML transformation callback.
	 */
	public function transform_html( $html ) {
		if ( empty( $html ) || strlen( $html ) < 200 || stripos( $html, '<html' ) === false ) {
			return $html;
		}

		$trimmed = ltrim( substr( $html, 0, 100 ) );
		if ( strpos( $trimmed, '<?xml' ) === 0 || strpos( $trimmed, '{' ) === 0 || strpos( $trimmed, '[' ) === 0 ) {
			return $html;
		}

		$font_swap_on      = ! empty( $this->options['optEnableFontSwap'] );
		$async_font_on     = ! empty( $this->options['optAsyncGoogleFonts'] );
		$self_host_font_on = ! empty( $this->options['optSelfHostGoogleFonts'] ) && class_exists( 'AIO_Font_Optimizer' );
		$async_css_on      = ! empty( $this->options['optEnableAsyncCss'] );
		$yt_facade_on      = ! empty( $this->options['optEnableYoutubeFacade'] );
		$smart_lcp_on      = ! empty( $this->options['optEnableSmartLcp'] );
		$lazyload_on       = ! empty( $this->options['opt-perf-lazyload'] );
		$lazy_bg_on        = ! empty( $this->options['optLazyLoadBg'] );
		$auto_dims_on      = ! empty( $this->options['optEnableAutoImageDims'] );
		$webp_rewrite_on   = ! empty( $this->options['optEnableWebpRewrite'] ) || ! empty( $this->options['opt-perf-webp'] );
		$delay_js_on       = ! empty( $this->options['optEnableDelayJS'] );
		$cdn_on            = ! empty( $this->options['optEnableCdn'] ) && ! empty( $this->options['txtCdnUrl'] );
		$minify_on         = ! empty( $this->options['optEnableMinify'] );

		$yt_count      = 0;
		$bg_lazy_count = 0;
		$font_detected = false;
		$font_preloads = array();

		// 1. Protect <script>, <style>, <noscript>, <template>, <textarea> before rewriting HTML tags
		//    If WebP rewrite is active, rewrite local .jpg/.jpeg/.png url(...) inside <style> blocks first.
		$protected_blocks = array();
		$block_idx        = 0;
		$working          = preg_replace_callback(
			'#<(script|style|noscript|template|textarea)\b[^>]*>.*?</\1>#is',
			function ( $m ) use ( &$protected_blocks, &$block_idx, $webp_rewrite_on ) {
				$block = $m[0];
				if ( $webp_rewrite_on && strtolower( $m[1] ) === 'style' && stripos( $block, 'url(' ) !== false ) {
					$rewritten_style = preg_replace_callback(
						'/url\(\s*(["\']?)([^"\')]+)\1\s*\)/i',
						function ( $um ) {
							$u = trim( $um[2] );
							if ( $u === '' || stripos( $u, 'data:' ) === 0 ) {
								return $um[0];
							}
							$new_u = $this->maybe_rewrite_url_to_webp( $u );
							return $new_u !== $u ? 'url(' . $um[1] . $new_u . $um[1] . ')' : $um[0];
						},
						$block
					);
					if ( $rewritten_style !== null ) {
						$block = $rewritten_style;
					}
				}
				$token                      = '%%AIO_SAFE_BLOCK_' . ( $block_idx++ ) . '%%';
				$protected_blocks[ $token ] = $block;
				return $token;
			},
			$html
		);

		if ( $working === null ) {
			$working          = $html;
			$protected_blocks = array();
		}

		// 2. Google Fonts Optimization (Self-Host Local WOFF2 + Preload, display=swap, Async load & Preconnect)
		if ( ( $self_host_font_on || $font_swap_on || $async_font_on ) && stripos( $working, 'fonts.googleapis.com' ) !== false ) {
			$font_optimizer = $self_host_font_on ? new AIO_Font_Optimizer() : null;

			$updated = preg_replace_callback(
				'/<link\b[^>]*\bhref=(["\'])([^"\']*fonts\.googleapis\.com\/css2?[^"\']*)\1[^>]*>/i',
				function ( $m ) use ( $font_optimizer, $font_swap_on, $async_font_on, &$font_detected, &$font_preloads ) {
					$tag       = $m[0];
					$quote     = $m[1];
					$url       = $m[2];
					$localized = false;

					if ( $font_optimizer ) {
						$loc = $font_optimizer->localize_stylesheet( $url );
						if ( is_array( $loc ) && ! empty( $loc['css_url'] ) ) {
							$new_url   = esc_url( $loc['css_url'] );
							$tag       = str_replace( $quote . $url . $quote, $quote . $new_url . $quote, $tag );
							$url       = $new_url;
							$localized = true;
							if ( ! empty( $loc['preloads'] ) && is_array( $loc['preloads'] ) ) {
								foreach ( $loc['preloads'] as $p_url ) {
									$font_preloads[ $p_url ] = true;
								}
							}
						}
					}

					if ( ! $localized ) {
						$font_detected = true;
						if ( $font_swap_on && stripos( $url, 'display=' ) === false ) {
							$sep     = ( strpos( $url, '?' ) !== false ) ? '&amp;' : '?';
							$new_url = $url . $sep . 'display=swap';
							$tag     = str_replace( $quote . $url . $quote, $quote . $new_url . $quote, $tag );
							$url     = $new_url;
						}
					}

					if ( $async_font_on && stripos( $tag, 'onload=' ) === false && ! preg_match( '/\bmedia=(["\'])print\1/i', $tag ) ) {
						$tag = preg_replace( '/\s*\bmedia=(["\'])[^"\']*\1/i', '', $tag );
						$tag = $this->inject_img_attrs( $tag, ' media="print" data-aio-async-css="1" onload="this.media=\'all\';this.onload=null;"' );
						$tag .= '<noscript><link rel="stylesheet" data-no-async="1" href="' . $url . '"></noscript>';
					}
					return $tag;
				},
				$working
			);
			if ( $updated !== null ) {
				$working = $updated;
			}

			if ( $self_host_font_on && ! $font_detected ) {
				$working = preg_replace( '/<link\b[^>]*\bhref=(["\'])[^"\']*fonts\.g(?:oogleapis|static)\.com[^"\']*\1[^>]*>\s*/i', '', $working ) ?? $working;
			}
			$head_injections = array();
			if ( ! empty( $font_preloads ) ) {
				foreach ( array_slice( array_keys( $font_preloads ), 0, 2 ) as $preload_woff2 ) {
					$head_injections[] = '<link rel="preload" as="font" type="font/woff2" href="' . esc_url( $preload_woff2 ) . '" crossorigin>';
				}
			}
			if ( $font_detected && stripos( $working, 'fonts.gstatic.com' ) === false ) {
				$head_injections[] = '<link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>';
			}
			if ( ! empty( $head_injections ) ) {
				$working = preg_replace( '/(<head\b[^>]*>)/i', "$1\n" . implode( "\n", $head_injections ), $working, 1 ) ?? $working;
			}
		}

		// 3. Eliminate Render-Blocking CSS (Async CSS delivery with Smart Anti-FOUC Theme Protection & <noscript> fallback)
		if ( $async_css_on ) {
			$css_excludes = array( 'admin-bar', 'dashicons', 'aio-yt-facade', 'data-aio-async-css', 'data-no-async' );
			if ( ! empty( $this->options['optAsyncCssExcludes'] ) ) {
				foreach ( preg_split( '/[\r\n]+/', (string) $this->options['optAsyncCssExcludes'] ) as $ex_css ) {
					$ex_css = trim( $ex_css );
					if ( $ex_css !== '' ) {
						$css_excludes[] = $ex_css;
					}
				}
			}

			$has_critical_css  = ! empty( trim( (string) ( isset( $this->options['optCriticalCss'] ) ? $this->options['optCriticalCss'] : '' ) ) );
			$protect_theme_css = ! $has_critical_css && ( ! isset( $this->options['optAsyncCssProtectTheme'] ) || ! empty( $this->options['optAsyncCssProtectTheme'] ) );
			$theme_slugs       = array_unique( array_filter( array( (string) get_template(), (string) get_stylesheet() ) ) );
			$theme_sync_kept   = 0;

			$updated = preg_replace_callback(
				'/<link\b[^>]*\brel=(["\'])stylesheet\1[^>]*>/i',
				function ( $m ) use ( $css_excludes, $protect_theme_css, $theme_slugs, &$theme_sync_kept ) {
					$tag = $m[0];
					foreach ( $css_excludes as $ex ) {
						if ( $ex !== '' && stripos( $tag, $ex ) !== false ) {
							if ( 'data-no-async' === $ex ) {
								$theme_sync_kept++;
							}
							return $tag;
						}
					}
					if ( preg_match( '/\bmedia=(["\'])print\1/i', $tag ) || stripos( $tag, 'onload=' ) !== false ) {
						return $tag;
					}
					if ( ! preg_match( '/\bhref=(["\'])([^"\']+)\1/i', $tag, $hm ) ) {
						return $tag;
					}

					// Smart Anti-FOUC: keep primary active theme layout stylesheet(s) synchronous when Critical CSS is blank
					if ( $protect_theme_css && $theme_sync_kept < 2 ) {
						$is_theme_sheet = ( stripos( $tag, '/themes/' ) !== false )
							|| (bool) preg_match( '/\bid=(["\'])(?:flatsome-main|style)-css\1/i', $tag );
						if ( $is_theme_sheet ) {
							$theme_sync_kept++;
							return $tag;
						}
					}

					$href = $hm[2];
					$new  = preg_replace( '/\s*\bmedia=(["\'])[^"\']*\1/i', '', $tag );
					$new  = $this->inject_img_attrs( $new, ' media="print" data-aio-async-css="1" onload="this.media=\'all\';this.onload=null;"' );
					return $new . '<noscript><link rel="stylesheet" href="' . $href . '"></noscript>';
				},
				$working
			);
			if ( $updated !== null ) {
				$working = $updated;
			}
		}

		// 4. YouTube Smart Facade
		if ( $yt_facade_on && ( stripos( $working, 'youtube.com/embed/' ) !== false || stripos( $working, 'youtube-nocookie.com/embed/' ) !== false ) ) {
			$updated = preg_replace_callback(
				'/<iframe\b([^>]*)\bsrc=(["\'])(?:https?:)?\/\/(?:www\.)?(?:youtube\.com|youtube-nocookie\.com)\/embed\/([A-Za-z0-9_-]{11})(?:\?([^"\']*))?\2([^>]*)>\s*<\/iframe>/is',
				function ( $m ) use ( &$yt_count ) {
					$full_attrs = $m[1] . ' ' . $m[5];
					$video_id   = $m[3];
					$query      = isset( $m[4] ) ? $m[4] : '';

					if ( preg_match( '/\b(?:aio-no-facade|no-lazy|skip-lazy)\b/i', $full_attrs ) ) {
						return $m[0];
					}
					if ( ! empty( $query ) && preg_match( '/(?:^|&|&amp;)(?:autoplay=1|mute=1|controls=0)(?:&|$)/i', $query ) ) {
						return $m[0];
					}

					$title = 'Play YouTube Video';
					if ( preg_match( '/\btitle=(["\'])([^"\']+)\1/i', $full_attrs, $tm ) ) {
						$title = trim( $tm[2] );
					}

					$yt_count++;
					$safe_id    = esc_attr( $video_id );
					$safe_title = esc_attr( $title );
					$thumb_url  = 'https://i.ytimg.com/vi/' . rawurlencode( $video_id ) . '/hqdefault.jpg';

					return '<div class="aio-yt-facade" data-ytid="' . $safe_id . '" role="button" tabindex="0" aria-label="' . $safe_title . '">'
						. '<img src="' . esc_url( $thumb_url ) . '" alt="' . $safe_title . '" width="480" height="360" loading="lazy" decoding="async">'
						. '<span class="aio-yt-play" aria-hidden="true"><svg viewBox="0 0 68 48" width="68" height="48"><path d="M66.52 7.74c-.78-2.93-2.49-5.41-5.42-6.19C55.79.13 34 0 34 0S12.21.13 6.9 1.55c-2.93.78-4.63 3.26-5.42 6.19C.06 13.05 0 24 0 24s.06 10.95 1.48 16.26c.78 2.93 2.49 5.41 5.42 6.19C12.21 47.87 34 48 34 48s21.79-.13 27.1-1.55c2.93-.78 4.64-3.26 5.42-6.19C67.94 34.95 68 24 68 24s-.06-10.95-1.48-16.26z" fill="#ff0000"/><path d="M45 24L27 14v20" fill="#ffffff"/></svg></span>'
						. '</div>';
				},
				$working
			);
			if ( $updated !== null ) {
				$working = $updated;
			}
		}

		// 5. Smart Image Optimizer (WebP Smart Rewrite + Auto Width/Height including SVG + Smart LCP + LazyLoad)
		if ( $smart_lcp_on || $lazyload_on || $auto_dims_on || $webp_rewrite_on ) {
			if ( $webp_rewrite_on && stripos( $working, '<source' ) !== false ) {
				$updated_sources = preg_replace_callback(
					'/<source\b[^>]*\bsrcset=(["\'])([^"\']+)\1[^>]*>/i',
					function ( $sm ) {
						$new_set = $this->maybe_rewrite_srcset_to_webp( $sm[2] );
						return $new_set !== $sm[2]
							? str_replace( $sm[1] . $sm[2] . $sm[1], $sm[1] . $new_set . $sm[1], $sm[0] )
							: $sm[0];
					},
					$working
				);
				if ( $updated_sources !== null ) {
					$working = $updated_sources;
				}
			}

			// Mark images inside <header> so hidden Mega Menu images never steal fetchpriority="high" from the real hero LCP image
			if ( stripos( $working, '<header' ) !== false ) {
				$working = preg_replace_callback(
					'/<header\b[^>]*>[\s\S]*?<\/header>/i',
					function ( $hm ) {
						return preg_replace_callback(
							'/<img\b[^>]*>/i',
							function ( $im ) {
								$itag = preg_replace( '/\s*\bfetchpriority\s*=\s*(?:["\'][^"\']*["\']|[^\s>]+)/i', '', $im[0] );
								return $this->inject_img_attrs( $itag, ' data-aio-in-header="1"' );
							},
							$hm[0]
						) ?? $hm[0];
					},
					$working
				) ?? $working;
			}

			$lcp_assigned = false;
			$updated      = preg_replace_callback(
				'/<img\b[^>]*>/i',
				function ( $m ) use ( $smart_lcp_on, $lazyload_on, $auto_dims_on, $webp_rewrite_on, &$lcp_assigned ) {
					$tag = $m[0];

					if ( strpos( $tag, 'i.ytimg.com/vi/' ) !== false ) {
						return $tag;
					}

					$in_header = false;
					if ( strpos( $tag, 'data-aio-in-header="1"' ) !== false ) {
						$in_header = true;
						$tag       = str_replace( ' data-aio-in-header="1"', '', $tag );
					}

					// 5a. Rewrite hardcoded .jpg/.png URLs in src, data-src, srcset, data-srcset to .webp if verified on disk
					if ( $webp_rewrite_on ) {
						foreach ( array( 'src', 'data-src' ) as $s_attr ) {
							if ( preg_match( '/\b' . preg_quote( $s_attr, '/' ) . '=(["\'])([^"\']+)\1/i', $tag, $am ) ) {
								$w_url = $this->maybe_rewrite_url_to_webp( $am[2] );
								if ( $w_url !== $am[2] ) {
									$tag = str_replace( $am[0], $s_attr . '=' . $am[1] . $w_url . $am[1], $tag );
								}
							}
						}
						foreach ( array( 'srcset', 'data-srcset' ) as $ss_attr ) {
							if ( preg_match( '/\b' . preg_quote( $ss_attr, '/' ) . '=(["\'])([^"\']+)\1/i', $tag, $ssm ) ) {
								$w_set = $this->maybe_rewrite_srcset_to_webp( $ssm[2] );
								if ( $w_set !== $ssm[2] ) {
									$tag = str_replace( $ssm[0], $ss_attr . '=' . $ssm[1] . $w_set . $ssm[1], $tag );
								}
							}
						}
					}

					$src = '';
					if ( preg_match( '/\bsrc=(["\'])([^"\']+)\1/i', $tag, $sm ) ) {
						$src = trim( $sm[2] );
					} elseif ( preg_match( '/\bdata-src=(["\'])([^"\']+)\1/i', $tag, $sm ) ) {
						$src = trim( $sm[2] );
					}
					$is_data_uri = ( stripos( $src, 'data:' ) === 0 );

					$has_width  = (bool) preg_match( '/\bwidth\s*=\s*["\']?\d+\s*["\']?(?:\s|>|\/)/i', $tag );
					$has_height = (bool) preg_match( '/\bheight\s*=\s*["\']?\d+\s*["\']?(?:\s|>|\/)/i', $tag );
					$img_w      = 0;
					$img_h      = 0;

					if ( $has_width && preg_match( '/\bwidth\s*=\s*["\']?(\d+)/i', $tag, $wm ) ) {
						$img_w = (int) $wm[1];
					}
					if ( $has_height && preg_match( '/\bheight\s*=\s*["\']?(\d+)/i', $tag, $hm ) ) {
						$img_h = (int) $hm[1];
					}

					// Inject missing width & height across uploads, themes, plugins, and SVGs
					if ( $auto_dims_on && ! $is_data_uri && ! empty( $src ) && ( ! $has_width || ! $has_height ) ) {
						$dims = $this->resolve_local_image_dims( $src );
						if ( is_array( $dims ) && $dims[0] > 0 && $dims[1] > 0 ) {
							$img_w    = (int) $dims[0];
							$img_h    = (int) $dims[1];
							$dim_attr = '';
							if ( ! $has_width ) {
								$dim_attr .= ' width="' . $img_w . '"';
							}
							if ( ! $has_height ) {
								$dim_attr .= ' height="' . $img_h . '"';
							}
							if ( $dim_attr !== '' ) {
								$tag = $this->inject_img_attrs( $tag, $dim_attr );
							}
						}
					}

					$is_explicit_lcp = ! $in_header && (
						(bool) preg_match( '/\bclass=(["\'])[^"\']*\baio-lcp\b[^"\']*\1/i', $tag )
						|| stripos( $tag, 'fetchpriority="high"' ) !== false
						|| stripos( $tag, "fetchpriority='high'" ) !== false
					);

					$is_skip_lcp = $in_header
						|| $is_data_uri
						|| preg_match( '/\bclass=(["\'])[^"\']*\b(?:avatar|custom-logo|header_logo|header-logo|wp-smiley|emoji|aio-no-lcp)\b[^"\']*\1/i', $tag )
						|| ( $img_w > 0 && $img_w < 120 )
						|| ( $img_h > 0 && $img_h < 80 );

					if ( ( $is_explicit_lcp || ( ! $lcp_assigned && ! $is_skip_lcp ) ) && ! empty( $src ) ) {
						$lcp_assigned = true;
						if ( $smart_lcp_on || $is_explicit_lcp ) {
							$tag = preg_replace( '/\s*\bloading\s*=\s*(?:["\']lazy["\']|lazy\b)/i', '', $tag );
							$tag = preg_replace( '/\bsizes=(["\'])auto,\s*/i', 'sizes=$1', $tag );
							$add = '';
							if ( stripos( $tag, 'fetchpriority=' ) === false ) {
								$add .= ' fetchpriority="high"';
							}
							if ( stripos( $tag, 'decoding=' ) === false ) {
								$add .= ' decoding="async"';
							}
							if ( $add !== '' ) {
								$tag = $this->inject_img_attrs( $tag, $add );
							}
						}
						return $tag;
					}

					$extra = '';
					if ( $lazyload_on && ! $is_data_uri && stripos( $tag, 'loading=' ) === false && stripos( $tag, 'fetchpriority="high"' ) === false && ! preg_match( '/\b(?:no-lazy|skip-lazy|eager|custom-logo|header_logo|header-logo)\b/i', $tag ) ) {
						$extra .= ' loading="lazy"';
					}
					if ( ( $smart_lcp_on || $lazyload_on ) && ! $is_data_uri && stripos( $tag, 'decoding=' ) === false ) {
						$extra .= ' decoding="async"';
					}
					if ( $extra !== '' ) {
						$tag = $this->inject_img_attrs( $tag, $extra );
					}

					return $tag;
				},
				$working
			);
			if ( $updated !== null ) {
				$working = $updated;
			}

			if ( $lazyload_on && stripos( $working, '<iframe' ) !== false ) {
				$updated_iframes = preg_replace_callback(
					'/<iframe\b[^>]*>/i',
					function ( $m ) {
						$tag = $m[0];
						if ( stripos( $tag, 'loading=' ) === false && ! preg_match( '/\b(?:no-lazy|skip-lazy|eager)\b/i', $tag ) ) {
							$tag = preg_replace( '/^<iframe\b/i', '<iframe loading="lazy"', $tag, 1 );
						}
						return $tag;
					},
					$working
				);
				if ( $updated_iframes !== null ) {
					$working = $updated_iframes;
				}
			}
		}

		// 6. CSS Inline Background-Image WebP Rewrite + Lazy Load (skips first 2 viewport backgrounds for LCP)
		if ( ( $lazy_bg_on || $webp_rewrite_on ) && stripos( $working, 'background-image' ) !== false ) {
			$bg_seen = 0;
			$updated = preg_replace_callback(
				'/<(div|section|article|aside|footer)\b([^>]*)\bstyle=(["\'])([^"\']*background-image\s*:\s*url\([^)]+\)[^"\']*)\3([^>]*)>/i',
				function ( $m ) use ( $lazy_bg_on, $webp_rewrite_on, &$bg_seen, &$bg_lazy_count ) {
					$bg_seen++;
					$style_str = $m[4];
					if ( ! preg_match( '/background-image\s*:\s*url\(\s*(["\']?)([^"\')]+)\1\s*\)\s*;?/i', $style_str, $um ) ) {
						return $m[0];
					}
					$bg_url = trim( $um[2] );
					if ( $bg_url === '' || stripos( $bg_url, 'data:' ) === 0 ) {
						return $m[0];
					}

					if ( $webp_rewrite_on ) {
						$bg_url = $this->maybe_rewrite_url_to_webp( $bg_url );
					}

					// Leave top-of-page hero section backgrounds synchronous for LCP (while keeping WebP URL if rewritten)
					if ( ! $lazy_bg_on || $bg_seen <= 2 || preg_match( '/\b(?:no-lazy|skip-lazy|eager)\b/i', $m[2] . ' ' . $m[5] ) ) {
						if ( $bg_url !== trim( $um[2] ) ) {
							$new_bg_decl = 'background-image:url(' . $um[1] . $bg_url . $um[1] . ');';
							$new_style   = str_replace( $um[0], $new_bg_decl, $style_str );
							return '<' . $m[1] . $m[2] . ' style=' . $m[3] . $new_style . $m[3] . $m[5] . '>';
						}
						return $m[0];
					}

					$clean_style = trim( str_replace( $um[0], '', $style_str ) );
					$bg_lazy_count++;
					$style_attr = $clean_style !== '' ? ' style=' . $m[3] . $clean_style . $m[3] : '';
					return '<' . $m[1] . $m[2] . $style_attr . ' data-aio-bg="' . esc_url( $bg_url ) . '"' . $m[5] . '>';
				},
				$working
			);
			if ( $updated !== null ) {
				$working = $updated;
			}
		}

		// Persist image dimension cache once if updated
		if ( $this->dims_cache_dirty && is_array( $this->dims_cache ) ) {
			if ( count( $this->dims_cache ) > 450 ) {
				$this->dims_cache = array_slice( $this->dims_cache, -450, null, true );
			}
			set_transient( 'aio_img_dims_cache', $this->dims_cache, 7 * DAY_IN_SECONDS );
			$this->dims_cache_dirty = false;
		}

		// Restore protected blocks before CDN rewrite, Delay JS & Minify
		if ( ! empty( $protected_blocks ) ) {
			$working = strtr( $working, $protected_blocks );
		}

		// 7. CDN Static Asset URL Rewriter
		if ( $cdn_on ) {
			$working = $this->apply_cdn_rewrite( $working );
		}

		// 8. Inject YouTube Smart Facade CSS + JS when needed
		if ( $yt_count > 0 ) {
			$yt_css = '<style id="aio-yt-facade-css">.aio-yt-facade{position:relative;display:block;width:100%;aspect-ratio:16/9;background:#000;cursor:pointer;overflow:hidden;border-radius:8px}.aio-yt-facade img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;margin:0;border:0;transition:transform .25s ease,opacity .25s ease}.aio-yt-facade:hover img{transform:scale(1.03);opacity:.9}.aio-yt-facade .aio-yt-play{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:68px;height:48px;pointer-events:none;filter:drop-shadow(0 4px 12px rgba(0,0,0,.45));transition:transform .2s ease}.aio-yt-facade:hover .aio-yt-play{transform:translate(-50%,-50%) scale(1.08)}.aio-yt-facade iframe{position:absolute;inset:0;width:100%;height:100%;border:0}</style>';
			$yt_js  = '<script id="aio-yt-facade-js" data-aio-no-delay="1">(function(){function play(el){if(!el||el.dataset.loaded)return;el.dataset.loaded="1";var id=el.getAttribute("data-ytid");if(!id)return;var f=document.createElement("iframe");f.src="https://www.youtube-nocookie.com/embed/"+encodeURIComponent(id)+"?autoplay=1&rel=0";f.allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share";f.allowFullscreen=true;el.innerHTML="";el.appendChild(f);}document.addEventListener("click",function(e){var el=e.target&&e.target.closest?e.target.closest(".aio-yt-facade"):null;if(el){e.preventDefault();play(el);}});document.addEventListener("keydown",function(e){if(e.key==="Enter"||e.key===" "){var el=e.target&&e.target.closest?e.target.closest(".aio-yt-facade"):null;if(el){e.preventDefault();play(el);}}});})();</script>';

			if ( stripos( $working, '</head>' ) !== false ) {
				$working = str_ireplace( '</head>', $yt_css . "\n</head>", $working );
			} else {
				$working = $yt_css . "\n" . $working;
			}
			if ( stripos( $working, '</body>' ) !== false ) {
				$working = str_ireplace( '</body>', $yt_js . "\n</body>", $working );
			} else {
				$working .= "\n" . $yt_js;
			}
		}

		// 9. Inject CSS Background LazyObserver when needed
		if ( $bg_lazy_count > 0 ) {
			$bg_js = '<script id="aio-lazy-bg-js" data-aio-no-delay="1">(function(){var els=[].slice.call(document.querySelectorAll("[data-aio-bg]"));if(!els.length)return;function load(el){var u=el.getAttribute("data-aio-bg");if(u){el.style.backgroundImage="url(\""+u+"\")";el.removeAttribute("data-aio-bg");}}if(!("IntersectionObserver" in window)){els.forEach(load);return;}var io=new IntersectionObserver(function(es){es.forEach(function(e){if(e.isIntersecting){load(e.target);io.unobserve(e.target);}});},{rootMargin:"300px"});els.forEach(function(el){io.observe(el);});})();</script>';
			if ( stripos( $working, '</body>' ) !== false ) {
				$working = str_ireplace( '</body>', $bg_js . "\n</body>", $working );
			} else {
				$working .= "\n" . $bg_js;
			}
		}

		// 10. Delay JavaScript Execution until First User Interaction or 5s Timeout
		if ( $delay_js_on ) {
			$working = $this->apply_delay_js( $working );
		}

		// 11. Safe HTML Minifier
		if ( $minify_on ) {
			$working = self::minify_html( $working );
		}

		return $working;
	}

	private function inject_img_attrs( $tag, $attrs ) {
		if ( substr( rtrim( $tag ), -2 ) === '/>' ) {
			return preg_replace( '/\s*\/>$/', $attrs . ' />', $tag, 1 );
		}
		return preg_replace( '/>$/', $attrs . '>', $tag, 1 );
	}

	private function is_local_host( $host ) {
		$h = strtolower( preg_replace( '/^www\./i', '', trim( (string) $host ) ) );
		$s = strtolower( preg_replace( '/^www\./i', '', trim( (string) $this->site_host ) ) );
		if ( $h === '' ) {
			return false;
		}
		if ( $h === $s || in_array( $h, array( 'winlab.vn', 'winlab.asia', 'winlab.local', 'winlab.test' ), true ) ) {
			return true;
		}
		return false;
	}

	/**
	 * Safely rewrite a local .jpg/.jpeg/.png URL to its .webp counterpart ONLY if the .webp file exists on disk.
	 * Works even when original .jpg/.png was deleted after WebP conversion!
	 */
	private function maybe_rewrite_url_to_webp( $url ) {
		$raw_url = trim( (string) $url );
		if ( $raw_url === '' || stripos( $raw_url, 'data:' ) === 0 ) {
			return $url;
		}

		$clean_url = strtok( $raw_url, '?#' );
		if ( ! preg_match( '/\.(?:jpe?g|png)$/i', (string) $clean_url ) ) {
			return $url;
		}

		if ( isset( $this->webp_url_cache[ $clean_url ] ) ) {
			return $this->webp_url_cache[ $clean_url ];
		}

		$norm_url = $clean_url;
		if ( strpos( $norm_url, '//' ) === 0 ) {
			$norm_url = ( is_ssl() ? 'https:' : 'http:' ) . $norm_url;
		} elseif ( strpos( $norm_url, '/' ) === 0 ) {
			$norm_url = home_url( $norm_url );
		}

		$host = strtolower( (string) wp_parse_url( $norm_url, PHP_URL_HOST ) );
		if ( ! $this->is_local_host( $host ) ) {
			$this->webp_url_cache[ $clean_url ] = $url;
			return $url;
		}

		$url_path = rawurldecode( (string) wp_parse_url( $norm_url, PHP_URL_PATH ) );
		if ( $this->home_path_prefix !== '' && strpos( $url_path, $this->home_path_prefix . '/' ) === 0 ) {
			$url_path = substr( $url_path, strlen( $this->home_path_prefix ) );
		}

		if ( strpos( $url_path, '..' ) !== false || strpos( $url_path, "\0" ) !== false ) {
			$this->webp_url_cache[ $clean_url ] = $url;
			return $url;
		}

		$abs_root  = trailingslashit( wp_normalize_path( ABSPATH ) );
		$orig_path = wp_normalize_path( $abs_root . ltrim( $url_path, '/' ) );
		if ( strpos( $orig_path, $abs_root ) !== 0 ) {
			$this->webp_url_cache[ $clean_url ] = $url;
			return $url;
		}

		// Candidate 1: standard AIO Tools replacement naming (photo.jpg -> photo.webp)
		$webp_path_1 = preg_replace( '/\.(?:jpe?g|png)$/i', '.webp', $orig_path );
		if ( $webp_path_1 && is_file( $webp_path_1 ) && filesize( $webp_path_1 ) > 100 ) {
			$rewritten                          = preg_replace( '/\.(?:jpe?g|png)$/i', '.webp', $clean_url );
			$this->webp_url_cache[ $clean_url ] = $rewritten;
			return $rewritten;
		}

		// Candidate 2: appended extension naming (photo.jpg -> photo.jpg.webp)
		$webp_path_2 = $orig_path . '.webp';
		if ( is_file( $webp_path_2 ) && filesize( $webp_path_2 ) > 100 ) {
			$rewritten                          = $clean_url . '.webp';
			$this->webp_url_cache[ $clean_url ] = $rewritten;
			return $rewritten;
		}

		$this->webp_url_cache[ $clean_url ] = $url;
		return $url;
	}

	/**
	 * Rewrite all local .jpg/.jpeg/.png candidates inside an HTML srcset attribute to .webp if present on disk.
	 */
	private function maybe_rewrite_srcset_to_webp( $srcset ) {
		$parts = explode( ',', (string) $srcset );
		$out   = array();
		foreach ( $parts as $part ) {
			$trimmed = trim( $part );
			if ( $trimmed === '' ) {
				continue;
			}
			$tokens    = preg_split( '/\s+/', $trimmed, 2 );
			$tokens[0] = $this->maybe_rewrite_url_to_webp( $tokens[0] );
			$out[]     = implode( ' ', $tokens );
		}
		return ! empty( $out ) ? implode( ', ', $out ) : $srcset;
	}

	/**
	 * Resolve width & height of ANY local site image (uploads, themes, plugins, wp-includes) including SVG!
	 */
	private function resolve_local_image_dims( $url ) {
		$clean_url = strtok( $url, '?#' );
		if ( empty( $clean_url ) ) {
			return false;
		}

		// Fast path 1: WordPress intermediate thumbnail suffix -WIDTHxHEIGHT.ext
		if ( preg_match( '/-(\d{2,5})x(\d{2,5})\.(?:jpe?g|png|webp|gif|avif)$/i', $clean_url, $m ) ) {
			return array( (int) $m[1], (int) $m[2] );
		}

		if ( $this->dims_cache === null ) {
			$cached           = get_transient( 'aio_img_dims_cache' );
			$this->dims_cache = is_array( $cached ) ? $cached : array();
		}

		if ( isset( $this->dims_cache[ $clean_url ] ) ) {
			return $this->dims_cache[ $clean_url ];
		}

		$norm_url = $clean_url;
		if ( strpos( $norm_url, '//' ) === 0 ) {
			$norm_url = ( is_ssl() ? 'https:' : 'http:' ) . $norm_url;
		} elseif ( strpos( $norm_url, '/' ) === 0 ) {
			$norm_url = home_url( $norm_url );
		}

		$host = strtolower( (string) wp_parse_url( $norm_url, PHP_URL_HOST ) );
		if ( ! $this->is_local_host( $host ) ) {
			return false;
		}

		$url_path = rawurldecode( (string) wp_parse_url( $norm_url, PHP_URL_PATH ) );
		if ( $this->home_path_prefix !== '' && strpos( $url_path, $this->home_path_prefix . '/' ) === 0 ) {
			$url_path = substr( $url_path, strlen( $this->home_path_prefix ) );
		}

		if ( strpos( $url_path, '..' ) !== false || strpos( $url_path, "\0" ) !== false ) {
			return false;
		}

		$abs_root   = trailingslashit( wp_normalize_path( ABSPATH ) );
		$local_file = wp_normalize_path( $abs_root . ltrim( $url_path, '/' ) );
		if ( strpos( $local_file, $abs_root ) !== 0 || ! is_file( $local_file ) || ! is_readable( $local_file ) ) {
			return false;
		}

		$dims = false;

		// SVG Dimension Parser (reads <svg width="..." height="..." viewBox="...">)
		if ( preg_match( '/\.svg$/i', $local_file ) ) {
			$svg_head = (string) @file_get_contents( $local_file, false, null, 0, 2048 ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
			if ( preg_match( '/<svg\b[^>]*>/is', $svg_head, $sm ) ) {
				$svg_tag = $sm[0];
				$sw      = 0;
				$sh      = 0;
				if ( preg_match( '/\bwidth\s*=\s*["\']\s*([0-9]+(?:\.[0-9]+)?)\s*(?:px)?\s*["\']/i', $svg_tag, $wm ) ) {
					$sw = (int) round( (float) $wm[1] );
				}
				if ( preg_match( '/\bheight\s*=\s*["\']\s*([0-9]+(?:\.[0-9]+)?)\s*(?:px)?\s*["\']/i', $svg_tag, $hm ) ) {
					$sh = (int) round( (float) $hm[1] );
				}
				if ( ( $sw <= 0 || $sh <= 0 ) && preg_match( '/\bviewBox\s*=\s*["\']\s*[-0-9.]+\s+[-0-9.]+\s+([0-9.]+)\s+([0-9.]+)\s*["\']/i', $svg_tag, $vm ) ) {
					$sw = (int) round( (float) $vm[1] );
					$sh = (int) round( (float) $vm[2] );
				}
				if ( $sw > 0 && $sh > 0 ) {
					$dims = array( $sw, $sh );
				}
			}
		} else {
			$size = function_exists( 'wp_getimagesize' ) ? @wp_getimagesize( $local_file ) : @getimagesize( $local_file ); // phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
			if ( is_array( $size ) && ! empty( $size[0] ) && ! empty( $size[1] ) ) {
				$dims = array( (int) $size[0], (int) $size[1] );
			}
		}

		if ( is_array( $dims ) ) {
			$this->dims_cache[ $clean_url ] = $dims;
			$this->dims_cache_dirty         = true;
			return $dims;
		}

		return false;
	}

	/**
	 * Rewrite static /wp-content/ and /wp-includes/ URLs to user-configured CDN hostname.
	 */
	private function apply_cdn_rewrite( $html ) {
		$raw_cdn = trim( (string) $this->options['txtCdnUrl'] );
		if ( $raw_cdn === '' ) {
			return $html;
		}
		if ( strpos( $raw_cdn, '//' ) === 0 ) {
			$raw_cdn = 'https:' . $raw_cdn;
		} elseif ( ! preg_match( '#^https?://#i', $raw_cdn ) ) {
			$raw_cdn = 'https://' . ltrim( $raw_cdn, '/' );
		}
		$cdn_base  = rtrim( $raw_cdn, '/' );
		$home_base = rtrim( home_url(), '/' );

		if ( strtolower( $cdn_base ) === strtolower( $home_base ) ) {
			return $html;
		}

		$escaped_home = preg_quote( preg_replace( '#^https?:#i', '', $home_base ), '#' );
		$pattern      = '#(?:https?:)?' . $escaped_home . '(/(?:wp-content|wp-includes)/[^"\'\s\)<>]+?\.(?:css|js|jpe?g|png|gif|webp|avif|svg|ico|woff2?|ttf|otf|eot|mp4|webm))(?=["\'\s\)?\#>])#i';

		return preg_replace( $pattern, $cdn_base . '$1', $html ) ?? $html;
	}

	private function apply_delay_js( $html ) {
		$mode         = isset( $this->options['optDelayJsMode'] ) && $this->options['optDelayJsMode'] === 'all' ? 'all' : 'targeted';
		$raw_excludes = isset( $this->options['optDelayJsExcludes'] ) ? (string) $this->options['optDelayJsExcludes'] : '';

		$safe_excludes = array(
			'jquery.min.js',
			'jquery.js',
			'jquery-core',
			'jquery-migrate',
			'/wp-includes/js/dist/hooks',
			'/wp-includes/js/dist/i18n',
			'flatsome-js',
			'flatsome.js',
			'chunk.slider',
			'chunk.popups',
			'chunk.tooltips',
			'slick-js',
			'slick.min.js',
			'shostvn-js',
			'shostvn-',
			'hoverIntent',
			'wc-checkout',
			'wc-cart',
			'wc-add-to-cart',
			'woocommerce',
			'challenges.cloudflare.com',
			'google.com/recaptcha',
			'gstatic.com/recaptcha',
			'aio-yt-facade',
			'aio-lazy-bg',
			'aio-instant-page',
			'aio-delay-js',
			'data-aio-no-delay',
			'data-no-optimize',
			'data-cfasync="false"',
		);

		foreach ( preg_split( '/[\r\n]+/', $raw_excludes ) as $line ) {
			$line = trim( $line );
			if ( $line !== '' ) {
				$safe_excludes[] = $line;
			}
		}

		$targeted_patterns = array(
			'googletagmanager.com',
			'google-analytics.com',
			'gtag/js',
			'analytics.js',
			'googlesyndication.com',
			'adsbygoogle',
			'connect.facebook.net',
			'fbevents.js',
			'embed.tawk.to',
			'Tawk_API',
			'chative.io',
			'chat.zalo.me',
			'sp.zalo.me',
			'analytics.tiktok.com',
			'ttq.load(',
			'static.hotjar.com',
			'_hjSettings',
			'clarity.ms',
			'snap.licdn.com',
			'bat.bing.com',
			'crisp.chat',
			'intercom.io',
			'livechatinc.com',
			'tidio.co',
			'mc.yandex.ru',
			'fbq(',
			'gtag(',
			'gt_widget_script',
		);

		$ns_blocks = array();
		$ns_idx    = 0;
		$masked    = preg_replace_callback(
			'#<(noscript|textarea)\b[^>]*>.*?</\1>#is',
			function ( $m ) use ( &$ns_blocks, &$ns_idx ) {
				$tok               = '%%AIO_NS_BLOCK_' . ( $ns_idx++ ) . '%%';
				$ns_blocks[ $tok ] = $m[0];
				return $tok;
			},
			$html
		);

		if ( $masked === null ) {
			return $html;
		}

		$delayed_count = 0;

		$rewritten = preg_replace_callback(
			'#<script\b([^>]*)>(.*?)</script>#is',
			function ( $m ) use ( $mode, $safe_excludes, $targeted_patterns, &$delayed_count ) {
				$full_tag = $m[0];
				$attrs    = $m[1];
				$body     = $m[2];

				$orig_type = '';
				if ( preg_match( '/\btype\s*=\s*(["\'])([^"\']*)\1/i', $attrs, $tm ) ) {
					$orig_type = strtolower( trim( $tm[2] ) );
				} elseif ( preg_match( '/\btype\s*=\s*([^\s>]+)/i', $attrs, $tm ) ) {
					$orig_type = strtolower( trim( $tm[1], '"\'' ) );
				}

				if ( $orig_type !== '' && ! in_array( $orig_type, array( 'text/javascript', 'application/javascript', 'javascript', 'module' ), true ) ) {
					return $full_tag;
				}

				$is_gt_widget = ( stripos( $full_tag, 'gt_widget_script' ) !== false );
				foreach ( $safe_excludes as $ex ) {
					if ( $ex !== '' && stripos( $full_tag, $ex ) !== false ) {
						if ( $is_gt_widget && 'data-no-optimize' === $ex ) {
							continue;
						}
						return $full_tag;
					}
				}

				$has_src = (bool) preg_match( '/\bsrc\s*=\s*(["\'])([^"\']+)\1/i', $attrs, $sm );

				if ( ! $has_src ) {
					if ( preg_match( '/\bid\s*=\s*["\'][^"\']*-(?:js-extra|js-before)["\']/i', $attrs ) ) {
						return $full_tag;
					}
					if ( stripos( $body, 'document.documentElement' ) !== false || trim( $body ) === '' ) {
						return $full_tag;
					}
				}

				if ( $mode === 'targeted' ) {
					$matched = false;
					foreach ( $targeted_patterns as $pat ) {
						if ( stripos( $full_tag, $pat ) !== false ) {
							$matched = true;
							break;
						}
					}
					if ( ! $matched ) {
						return $full_tag;
					}
				}

				$new_attrs = preg_replace( '/\s*\btype\s*=\s*(?:(["\'])[^"\']*\1|[^\s>]+)/i', '', $attrs );
				if ( $orig_type === 'module' ) {
					$new_attrs .= ' data-aio-type="module"';
				}

				if ( $has_src ) {
					$src_quote = $sm[1];
					$src_val   = $sm[2];
					$new_attrs = str_replace( $sm[0], 'data-aio-src=' . $src_quote . $src_val . $src_quote, $new_attrs );
				}

				$delayed_count++;
				return '<script type="aio-delayed-script"' . $new_attrs . '>' . $body . '</script>';
			},
			$masked
		);

		if ( $rewritten === null ) {
			return $html;
		}

		if ( ! empty( $ns_blocks ) ) {
			$rewritten = strtr( $rewritten, $ns_blocks );
		}

		if ( $delayed_count > 0 ) {
			$loader = '<script id="aio-delay-js-loader" data-aio-no-delay="1">(function(){var ran=false,evts=["keydown","mousedown","mousemove","touchmove","touchstart","touchend","wheel","scroll","click"];function trig(){if(ran)return;ran=true;evts.forEach(function(e){window.removeEventListener(e,trig,{passive:true});});clearTimeout(tm);var list=[].slice.call(document.querySelectorAll(\'script[type="aio-delayed-script"]\'));function next(i){if(i>=list.length){window.dispatchEvent(new Event("aio-scripts-loaded"));return;}var old=list[i],s=document.createElement("script");[].slice.call(old.attributes).forEach(function(a){if(a.name==="type")return;if(a.name==="data-aio-src"){s.src=a.value;}else if(a.name==="data-aio-type"){s.type=a.value;}else{s.setAttribute(a.name,a.value);}});if(s.src){var done=false, fin=function(){if(done)return;done=true;next(i+1);};s.onload=fin;s.onerror=fin;setTimeout(fin,5000);old.parentNode.replaceChild(s,old);}else{s.text=old.text||old.textContent||"";old.parentNode.replaceChild(s,old);next(i+1);}}next(0);}evts.forEach(function(e){window.addEventListener(e,trig,{passive:true});});var tm=setTimeout(trig,12000);})();</script>';

			if ( stripos( $rewritten, '</body>' ) !== false ) {
				$rewritten = str_ireplace( '</body>', $loader . "\n</body>", $rewritten );
			} else {
				$rewritten .= "\n" . $loader;
			}
		}

		return $rewritten;
	}

	public static function minify_html( $buffer ) {
		if ( empty( $buffer ) || stripos( $buffer, '<html' ) === false ) {
			return $buffer;
		}

		$placeholders = array();
		$index        = 0;

		$protected = preg_replace_callback(
			'#<(script|style|pre|textarea)\b[^>]*>.*?</\1>#is',
			function ( $matches ) use ( &$placeholders, &$index ) {
				$token                  = '%%AIO_MINIFY_BLOCK_' . ( $index++ ) . '%%';
				$placeholders[ $token ] = $matches[0];
				return $token;
			},
			$buffer
		);

		if ( $protected === null ) {
			return $buffer;
		}

		$minified = preg_replace( '/<!--(?!\s*(?:\[if [^\]]+]|<!|>|ko\b|\/ko\b))(?:(?!-->).)*-->/s', '', $protected );
		if ( $minified !== null ) {
			$minified = preg_replace( array( '/>[^\S ]+/s', '/[^\S ]+</s', '/(\s)+/s' ), array( '>', '<', '$1' ), $minified );
		}

		if ( $minified === null ) {
			return $buffer;
		}

		if ( ! empty( $placeholders ) ) {
			$minified = strtr( $minified, $placeholders );
		}

		return $minified;
	}
}