<?php
// If this file is called directly, abort.
if ( ! defined( 'WPINC' ) ) {
	die;
}

class AIO_Optimizer {

	private $options;

	public function __construct() {
		$this->options = get_option( 'aio_options', [] );

		$perf_active = aio_is_module_active( 'opt-module-performance' );
		$seo_active  = aio_is_module_active( 'opt-module-optimizer' );

		add_filter( 'cron_schedules', [ $this, 'add_cron_intervals' ] );

		/* ------------------------------------------------------------------
		 * A. Speed & Media Optimization (tied to Speed & Optimize module)
		 * ------------------------------------------------------------------ */
		if ( $perf_active ) {
			if ( ! empty( $this->options['opt-perf-webp'] ) ) {
				add_filter( 'wp_generate_attachment_metadata', [ $this, 'schedule_webp_conversion' ], 10, 2 );
				add_action( 'aio_convert_webp_cron', [ $this, 'process_webp_conversion' ] );
			}

			add_action( 'aio_process_webp_bulk_queue', [ $this, 'process_webp_bulk_queue' ] );

			if ( ! empty( $this->options['opt-perf-lazyload'] ) && ! aio_is_speed_safe_mode() ) {
				add_filter( 'wp_lazy_loading_enabled', '__return_true' );
			}

			// Note: Smart LazyLoad, Smart LCP, Auto Image Dimensions, Font Swap, YouTube Facade,
			// Delay JS, and Safe HTML Minify are executed in a single unified pass by AIO_Speed_HTML
			// inside modules/performance/class-aio-speed-html.php.

			if ( ! empty( $this->options['optEnableMediaReplace'] ) ) {
				add_filter( 'attachment_fields_to_edit', [ $this, 'add_media_replace_field' ], 10, 2 );
				add_action( 'edit_attachment', [ $this, 'process_media_replace' ] );
			}

			require_once dirname( __FILE__ ) . '/class-aio-caching.php';
			new AIO_Caching();
		}

		/* ------------------------------------------------------------------
		 * B. On-Page & Technical SEO (deferred to init priority 5 so Yoast,
		 *    RankMath, AIOSEO & SEOPress are already loaded before checking)
		 * ------------------------------------------------------------------ */
		if ( $seo_active ) {
			if ( ! empty( $this->options['optEnableAutoAltTags'] ) ) {
				add_filter( 'wp_get_attachment_image_attributes', [ $this, 'auto_fill_alt_tags' ], 10, 3 );
			}

			add_action( 'init', [ $this, 'register_seo_hooks' ], 5 );
		}
	}

	/**
	 * Detect active 3rd-party SEO suites AFTER all plugins have loaded.
	 */
	public function is_third_party_seo_active() {
		return defined( 'WPSEO_VERSION' )
			|| defined( 'RANK_MATH_VERSION' )
			|| defined( 'AIOSEO_VERSION' )
			|| defined( 'SEOPRESS_VERSION' )
			|| class_exists( 'All_in_One_SEO_Pack' );
	}

	/**
	 * Register SEO meta, OpenGraph, Sitemap, Schema, and Per-Post Meta Box hooks safely on init.
	 */
	public function register_seo_hooks() {
		if ( $this->is_third_party_seo_active() ) {
			return;
		}

		// Per-post/page/product SEO Meta Box (enabled by default unless explicitly turned off)
		$metabox_enabled = ! isset( $this->options['optEnableSeoMetaBox'] ) || ! empty( $this->options['optEnableSeoMetaBox'] );
		if ( $metabox_enabled ) {
			if ( is_admin() ) {
				add_action( 'add_meta_boxes', [ $this, 'register_seo_meta_box' ] );
				add_action( 'save_post', [ $this, 'save_seo_meta_box' ], 10, 2 );
			}
			add_filter( 'pre_get_document_title', [ $this, 'filter_custom_document_title' ], 20 );
			add_filter( 'wp_robots', [ $this, 'filter_custom_robots' ], 20 );
		}

		if ( ! empty( $this->options['optEnableMetaTags'] ) || $metabox_enabled ) {
			add_action( 'wp_head', [ $this, 'generate_meta_tags' ], 1 );
		}

		if ( ! empty( $this->options['optEnableOpenGraph'] ) ) {
			add_filter( 'language_attributes', [ $this, 'add_og_xml_ns' ] );
			add_action( 'wp_head', [ $this, 'generate_open_graph' ], 2 );
		}

		if ( ! empty( $this->options['optEnableSitemap'] ) ) {
			$this->register_sitemap_rewrite();
			add_filter( 'query_vars', [ $this, 'register_sitemap_query_var' ] );
			add_action( 'template_redirect', [ $this, 'render_sitemap' ], 1 );
			add_action( 'save_post', [ $this, 'purge_sitemap_cache' ] );
			add_action( 'deleted_post', [ $this, 'purge_sitemap_cache' ] );
			add_action( 'aio_tools_settings_updated', [ $this, 'purge_sitemap_cache' ] );
		}

		if ( ! empty( $this->options['optEnableSchema'] ) ) {
			add_action( 'wp_head', [ $this, 'generate_schema_markup' ], 2 );
		}
	}

	public function register_seo_meta_box() {
		$screens = [ 'post', 'page' ];
		if ( post_type_exists( 'product' ) ) {
			$screens[] = 'product';
		}
		foreach ( $screens as $screen ) {
			add_meta_box(
				'aio_seo_meta_box',
				__( 'AIO Tools — SEO & Social Meta', 'aio-tools' ),
				[ $this, 'render_seo_meta_box' ],
				$screen,
				'normal',
				'high'
			);
		}
	}

	public function render_seo_meta_box( $post ) {
		wp_nonce_field( 'aio_save_seo_metabox', 'aio_seo_metabox_nonce' );
		$seo_title   = (string) get_post_meta( $post->ID, '_aio_seo_title', true );
		$seo_desc    = (string) get_post_meta( $post->ID, '_aio_seo_desc', true );
		$seo_og_img  = (string) get_post_meta( $post->ID, '_aio_seo_og_image', true );
		$seo_noindex = (string) get_post_meta( $post->ID, '_aio_seo_noindex', true );
		?>
		<div style="display:grid; gap:14px; padding:6px 0;">
			<div>
				<label for="aio_seo_title" style="display:flex; justify-content:space-between; font-weight:600; margin-bottom:4px;">
					<span><?php esc_html_e( 'Custom SEO Title', 'aio-tools' ); ?></span>
					<small id="aio_seo_title_count" style="color:#64748b; font-weight:400;">0 / 60</small>
				</label>
				<input type="text" id="aio_seo_title" name="aio_seo_title" value="<?php echo esc_attr( $seo_title ); ?>" placeholder="<?php echo esc_attr( get_the_title( $post ) ); ?>" style="width:100%;" maxlength="120">
			</div>
			<div>
				<label for="aio_seo_desc" style="display:flex; justify-content:space-between; font-weight:600; margin-bottom:4px;">
					<span><?php esc_html_e( 'Meta Description', 'aio-tools' ); ?></span>
					<small id="aio_seo_desc_count" style="color:#64748b; font-weight:400;">0 / 160</small>
				</label>
				<textarea id="aio_seo_desc" name="aio_seo_desc" rows="3" style="width:100%;" maxlength="320" placeholder="<?php esc_attr_e( 'Enter a compelling summary for Google search results...', 'aio-tools' ); ?>"><?php echo esc_textarea( $seo_desc ); ?></textarea>
			</div>
			<div style="display:flex; flex-wrap:wrap; gap:12px; align-items:flex-end;">
				<div style="flex:1 1 240px; min-width:0;">
					<label for="aio_seo_og_image" style="display:block; font-weight:600; margin-bottom:4px;"><?php esc_html_e( 'Custom Open Graph Image URL (Optional)', 'aio-tools' ); ?></label>
					<input type="url" id="aio_seo_og_image" name="aio_seo_og_image" value="<?php echo esc_url( $seo_og_img ); ?>" placeholder="https://..." style="width:100%;">
				</div>
				<label style="display:inline-flex; align-items:center; gap:6px; padding-bottom:6px; font-weight:600; color:#475569;">
					<input type="checkbox" name="aio_seo_noindex" value="1" <?php checked( $seo_noindex, '1' ); ?>>
					<?php esc_html_e( 'Noindex (Hide from Google)', 'aio-tools' ); ?>
				</label>
			</div>
		</div>
		<script>
		(function(){
			var t = document.getElementById('aio_seo_title'), tc = document.getElementById('aio_seo_title_count');
			var d = document.getElementById('aio_seo_desc'), dc = document.getElementById('aio_seo_desc_count');
			function upd() {
				if (t && tc) { tc.textContent = t.value.length + ' / 60'; tc.style.color = t.value.length > 60 ? '#dc2626' : '#64748b'; }
				if (d && dc) { dc.textContent = d.value.length + ' / 160'; dc.style.color = d.value.length > 160 ? '#dc2626' : '#64748b'; }
			}
			if (t) t.addEventListener('input', upd);
			if (d) d.addEventListener('input', upd);
			upd();
		})();
		</script>
		<?php
	}

	public function save_seo_meta_box( $post_id, $post ) {
		if ( defined( 'DOING_AUTOSAVE' ) && DOING_AUTOSAVE ) {
			return;
		}
		if ( wp_is_post_revision( $post_id ) || ! isset( $_POST['aio_seo_metabox_nonce'] ) ) {
			return;
		}
		if ( ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['aio_seo_metabox_nonce'] ) ), 'aio_save_seo_metabox' ) ) {
			return;
		}
		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return;
		}

		$title   = isset( $_POST['aio_seo_title'] ) ? sanitize_text_field( wp_unslash( $_POST['aio_seo_title'] ) ) : '';
		$desc    = isset( $_POST['aio_seo_desc'] ) ? sanitize_textarea_field( wp_unslash( $_POST['aio_seo_desc'] ) ) : '';
		$og_img  = isset( $_POST['aio_seo_og_image'] ) ? esc_url_raw( wp_unslash( $_POST['aio_seo_og_image'] ) ) : '';
		$noindex = ! empty( $_POST['aio_seo_noindex'] ) ? '1' : '';

		if ( '' !== $title ) {
			update_post_meta( $post_id, '_aio_seo_title', $title );
		} else {
			delete_post_meta( $post_id, '_aio_seo_title' );
		}

		if ( '' !== $desc ) {
			update_post_meta( $post_id, '_aio_seo_desc', $desc );
		} else {
			delete_post_meta( $post_id, '_aio_seo_desc' );
		}

		if ( '' !== $og_img ) {
			update_post_meta( $post_id, '_aio_seo_og_image', $og_img );
		} else {
			delete_post_meta( $post_id, '_aio_seo_og_image' );
		}

		if ( '1' === $noindex ) {
			update_post_meta( $post_id, '_aio_seo_noindex', '1' );
		} else {
			delete_post_meta( $post_id, '_aio_seo_noindex' );
		}

		$this->purge_sitemap_cache();
	}

	public function filter_custom_document_title( $title ) {
		if ( is_singular() ) {
			$post_id = get_queried_object_id();
			if ( $post_id ) {
				$custom = trim( (string) get_post_meta( $post_id, '_aio_seo_title', true ) );
				if ( '' !== $custom ) {
					return $custom;
				}
			}
		}
		return $title;
	}

	public function filter_custom_robots( $robots ) {
		if ( is_singular() ) {
			$post_id = get_queried_object_id();
			if ( $post_id && '1' === (string) get_post_meta( $post_id, '_aio_seo_noindex', true ) ) {
				$robots['noindex'] = true;
			}
		}
		return $robots;
	}

	public function purge_sitemap_cache() {
		delete_transient( 'aio_sitemap_xml_cache' );
	}

	public function schedule_webp_conversion( $meta, $attachment_id ) {
		if ( ! wp_next_scheduled( 'aio_convert_webp_cron', [ $attachment_id ] ) ) {
			wp_schedule_single_event( time() + 5, 'aio_convert_webp_cron', [ $attachment_id ] );
		}
		return $meta;
	}

	public function add_cron_intervals( $schedules ) {
		$schedules['aio_every_minute'] = [
			'interval' => 60,
			'display'  => __( 'Every Minute', 'aio-tools' ),
		];
		return $schedules;
	}

	public function process_webp_conversion( $attachment_id ) {
		$delete_original = ! empty( $this->options['opt-perf-webp-delete-original'] );
		aio_generate_webp_for_attachment( $attachment_id, $delete_original );
	}

	public function process_webp_bulk_queue() {
		$stats = get_option( 'aio_webp_bulk_stats' );
		if ( ! $stats || empty( $stats['is_running'] ) || empty( $stats['queue'] ) ) {
			wp_clear_scheduled_hook( 'aio_process_webp_bulk_queue' );
			return;
		}

		$batch           = array_splice( $stats['queue'], 0, 10 );
		$delete_original = ! empty( $this->options['opt-perf-webp-delete-original'] );

		foreach ( $batch as $id ) {
			$result = aio_generate_webp_for_attachment( $id, $delete_original );
			$stats['processed']++;

			if ( is_array( $result ) && ! empty( $result['success'] ) ) {
				$stats['original_bytes'] += $result['original_size'];
				$stats['webp_bytes']     += $result['webp_size'];
				update_post_meta( $id, '_aio_webp_converted', true );
			} else {
				update_post_meta( $id, '_aio_webp_converted', 'failed_or_skipped' );
			}
		}

		if ( empty( $stats['queue'] ) ) {
			$stats['is_running'] = false;
			wp_clear_scheduled_hook( 'aio_process_webp_bulk_queue' );
		}

		update_option( 'aio_webp_bulk_stats', $stats, false );
	}

	/**
	 * Safe HTML Minifier fallback helper.
	 */
	public function minify_html_output( $buffer ) {
		if ( empty( $buffer ) || stripos( $buffer, '<html' ) === false ) {
			return $buffer;
		}

		$placeholders = [];
		$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 ( null === $protected ) {
			return $buffer;
		}

		$minified = preg_replace( '/<!--(?!\s*(?:\[if [^\]]+]|<!|>|ko\b|\/ko\b))(?:(?!-->).)*-->/s', '', $protected );
		if ( null !== $minified ) {
			$minified = preg_replace( [ '/>[^\S ]+/s', '/[^\S ]+</s', '/(\s)+/s' ], [ '>', '<', '$1' ], $minified );
		}

		if ( null === $minified ) {
			return $buffer;
		}

		if ( ! empty( $placeholders ) ) {
			$minified = strtr( $minified, $placeholders );
		}

		return $minified;
	}

	public function auto_fill_alt_tags( $attr, $attachment, $size ) {
		if ( empty( $attr['alt'] ) ) {
			$attr['alt'] = trim( wp_strip_all_tags( get_the_title( $attachment->ID ) ) );
			if ( empty( $attr['alt'] ) ) {
				$parent_id = wp_get_post_parent_id( $attachment->ID );
				if ( $parent_id ) {
					$attr['alt'] = trim( wp_strip_all_tags( get_the_title( $parent_id ) ) );
				}
			}
		}
		return $attr;
	}

	public function add_media_replace_field( $form_fields, $post ) {
		if ( function_exists( 'get_current_screen' ) ) {
			$screen = get_current_screen();
			if ( $screen && 'attachment' === $screen->id ) {
				$html  = '<p><input type="file" name="aio_media_replace" id="aio_media_replace" accept="image/*,video/*,audio/*,.pdf,.zip"></p>';
				$html .= '<p class="description" style="color:#ef4444;">' . esc_html__( 'Upload a new file to replace the current one. Note: The old file will be deleted permanently.', 'aio-tools' ) . '</p>';
				$html .= wp_nonce_field( 'aio_media_replace_action', 'aio_media_replace_nonce', true, false );

				$form_fields['aio_media_replace'] = [
					'label' => __( 'Replace File', 'aio-tools' ),
					'input' => 'html',
					'html'  => $html,
				];
			}
		}
		return $form_fields;
	}

	public function process_media_replace( $attachment_id ) {
		if ( ! current_user_can( 'edit_post', $attachment_id ) || ! current_user_can( 'upload_files' ) ) {
			return;
		}
		if ( ! empty( $_FILES['aio_media_replace']['name'] ) ) {
			if ( ! isset( $_POST['aio_media_replace_nonce'] ) || ! wp_verify_nonce( sanitize_text_field( wp_unslash( $_POST['aio_media_replace_nonce'] ) ), 'aio_media_replace_action' ) ) {
				return;
			}

			require_once ABSPATH . 'wp-admin/includes/file.php';
			require_once ABSPATH . 'wp-admin/includes/image.php';

			$uploaded_file    = $_FILES['aio_media_replace']; // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
			$upload_overrides = [ 'test_form' => false ];

			$old_file = get_attached_file( $attachment_id );
			$movefile = wp_handle_upload( $uploaded_file, $upload_overrides );

			if ( $movefile && ! isset( $movefile['error'] ) ) {
				if ( $old_file && file_exists( $old_file ) ) {
					wp_delete_file( $old_file );
				}

				$new_file = $movefile['file'];

				global $wpdb;
				// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
				$wpdb->update(
					$wpdb->posts,
					[ 'post_mime_type' => $movefile['type'], 'guid' => $movefile['url'] ],
					[ 'ID' => $attachment_id ]
				);

				update_attached_file( $attachment_id, $new_file );
				$attach_data = wp_generate_attachment_metadata( $attachment_id, $new_file );
				wp_update_attachment_metadata( $attachment_id, $attach_data );
			}
		}
	}

	public function generate_meta_tags() {
		if ( is_singular() ) {
			global $post;
			if ( ! $post ) {
				return;
			}
			$custom_desc = trim( (string) get_post_meta( $post->ID, '_aio_seo_desc', true ) );
			if ( '' !== $custom_desc ) {
				echo '<meta name="description" content="' . esc_attr( $custom_desc ) . '" />' . "\n";
				return;
			}
			if ( empty( $this->options['optEnableMetaTags'] ) ) {
				return;
			}
			$raw  = ! empty( $post->post_excerpt ) ? $post->post_excerpt : $post->post_content;
			$desc = wp_trim_words( wp_strip_all_tags( strip_shortcodes( (string) $raw ) ), 30, '...' );
			if ( ! empty( $desc ) ) {
				echo '<meta name="description" content="' . esc_attr( $desc ) . '" />' . "\n";
			}
		} elseif ( ( is_front_page() || is_home() ) && ! empty( $this->options['optEnableMetaTags'] ) ) {
			$desc = get_bloginfo( 'description' );
			if ( ! empty( $desc ) ) {
				echo '<meta name="description" content="' . esc_attr( $desc ) . '" />' . "\n";
			}
		}
	}

	public function add_og_xml_ns( $output ) {
		if ( strpos( $output, 'og: http://ogp.me/ns#' ) === false ) {
			return $output . ' prefix="og: http://ogp.me/ns#"';
		}
		return $output;
	}

	public function generate_open_graph() {
		if ( is_singular() ) {
			global $post;
			$custom_title = $post ? trim( (string) get_post_meta( $post->ID, '_aio_seo_title', true ) ) : '';
			$custom_desc  = $post ? trim( (string) get_post_meta( $post->ID, '_aio_seo_desc', true ) ) : '';
			$custom_img   = $post ? trim( (string) get_post_meta( $post->ID, '_aio_seo_og_image', true ) ) : '';

			$title = '' !== $custom_title ? $custom_title : get_the_title();
			$url   = get_permalink();
			if ( '' !== $custom_desc ) {
				$desc = $custom_desc;
			} else {
				$raw  = ( $post && ! empty( $post->post_excerpt ) ) ? $post->post_excerpt : ( $post ? $post->post_content : '' );
				$desc = wp_trim_words( wp_strip_all_tags( strip_shortcodes( (string) $raw ) ), 30, '...' );
			}
			$type  = is_singular( 'product' ) ? 'product' : 'article';
			$image = '' !== $custom_img ? $custom_img : ( $post ? get_the_post_thumbnail_url( $post->ID, 'large' ) : '' );
		} else {
			$title = get_bloginfo( 'name' );
			$url   = home_url( '/' );
			$desc  = get_bloginfo( 'description' );
			$type  = 'website';
			$image = has_custom_logo() ? wp_get_attachment_image_url( get_theme_mod( 'custom_logo' ), 'full' ) : '';
		}

		echo '<meta property="og:site_name" content="' . esc_attr( get_bloginfo( 'name' ) ) . '" />' . "\n";
		echo '<meta property="og:title" content="' . esc_attr( $title ) . '" />' . "\n";
		echo '<meta property="og:type" content="' . esc_attr( $type ) . '" />' . "\n";
		echo '<meta property="og:url" content="' . esc_url( $url ) . '" />' . "\n";
		if ( ! empty( $desc ) ) {
			echo '<meta property="og:description" content="' . esc_attr( $desc ) . '" />' . "\n";
		}
		if ( ! empty( $image ) ) {
			echo '<meta property="og:image" content="' . esc_url( $image ) . '" />' . "\n";
		}
		echo '<meta name="twitter:card" content="summary_large_image" />' . "\n";
	}

	public function register_sitemap_rewrite() {
		add_rewrite_rule( '^sitemap\.xml$', 'index.php?aio_sitemap=1', 'top' );
	}

	public function register_sitemap_query_var( $vars ) {
		$vars[] = 'aio_sitemap';
		return $vars;
	}

	public function render_sitemap() {
		$uri       = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
		$path      = trim( (string) wp_parse_url( $uri, PHP_URL_PATH ), '/' );
		$home_path = trim( (string) wp_parse_url( home_url(), PHP_URL_PATH ), '/' );
		if ( '' !== $home_path && ( $path === $home_path || strpos( $path, $home_path . '/' ) === 0 ) ) {
			$path = trim( substr( $path, strlen( $home_path ) ), '/' );
		}

		if ( get_query_var( 'aio_sitemap' ) || 'sitemap.xml' === $path ) {
			$xml = get_transient( 'aio_sitemap_xml_cache' );

			if ( false === $xml ) {
				ob_start();
				echo '<?xml version="1.0" encoding="UTF-8"?>' . "\n";
				echo '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">' . "\n";
				echo '<url><loc>' . esc_url( home_url( '/' ) ) . '</loc><changefreq>daily</changefreq><priority>1.0</priority></url>' . "\n";

				$post_types = [ 'post', 'page' ];
				if ( post_type_exists( 'product' ) ) {
					$post_types[] = 'product';
				}

				$query = new WP_Query( [
					'post_type'              => $post_types,
					'post_status'            => 'publish',
					'posts_per_page'         => 1000,
					'orderby'                => 'modified',
					'order'                  => 'DESC',
					'no_found_rows'          => true,
					'update_post_meta_cache' => true,
					'update_post_term_cache' => false,
				] );

				if ( $query->have_posts() ) {
					while ( $query->have_posts() ) {
						$query->the_post();
						if ( '1' === (string) get_post_meta( get_the_ID(), '_aio_seo_noindex', true ) ) {
							continue;
						}
						$modified = get_the_modified_time( 'c' );
						echo '<url><loc>' . esc_url( get_permalink() ) . '</loc><lastmod>' . esc_html( $modified ) . '</lastmod><priority>0.8</priority></url>' . "\n";
					}
					wp_reset_postdata();
				}

				echo '</urlset>';
				$xml = ob_get_clean();
				set_transient( 'aio_sitemap_xml_cache', $xml, 12 * HOUR_IN_SECONDS );
			}

			status_header( 200 );
			header( 'Content-Type: application/xml; charset=utf-8' );
			// phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped
			echo $xml;
			exit;
		}
	}

	public function generate_schema_markup() {
		$graphs = [];

		if ( is_front_page() || is_home() ) {
			$graphs[] = [
				'@type' => 'WebSite',
				'name'  => get_bloginfo( 'name' ),
				'url'   => home_url( '/' ),
			];
		} elseif ( is_singular() ) {
			global $post;
			if ( ! $post ) {
				return;
			}

			// BreadcrumbList Schema
			$items   = [];
			$items[] = [
				'@type'    => 'ListItem',
				'position' => 1,
				'name'     => __( 'Home', 'aio-tools' ),
				'item'     => home_url( '/' ),
			];
			$pos = 2;
			if ( is_singular( 'post' ) ) {
				$cats = get_the_category( $post->ID );
				if ( ! empty( $cats ) ) {
					$items[] = [
						'@type'    => 'ListItem',
						'position' => $pos++,
						'name'     => $cats[0]->name,
						'item'     => get_category_link( $cats[0]->term_id ),
					];
				}
			} elseif ( is_singular( 'product' ) && function_exists( 'wc_get_page_permalink' ) ) {
				$shop_url = wc_get_page_permalink( 'shop' );
				if ( $shop_url ) {
					$items[] = [
						'@type'    => 'ListItem',
						'position' => $pos++,
						'name'     => __( 'Shop', 'aio-tools' ),
						'item'     => $shop_url,
					];
				}
			}
			$items[] = [
				'@type'    => 'ListItem',
				'position' => $pos,
				'name'     => get_the_title( $post ),
				'item'     => get_permalink( $post ),
			];

			$graphs[] = [
				'@type'           => 'BreadcrumbList',
				'itemListElement' => $items,
			];

			if ( is_singular( 'post' ) ) {
				$article = [
					'@type'         => 'Article',
					'headline'      => get_the_title( $post ),
					'datePublished' => get_the_date( 'c', $post ),
					'dateModified'  => get_the_modified_date( 'c', $post ),
					'author'        => [
						'@type' => 'Person',
						'name'  => get_the_author_meta( 'display_name', $post->post_author ),
					],
					'publisher'     => [
						'@type' => 'Organization',
						'name'  => get_bloginfo( 'name' ),
					],
				];
				if ( has_post_thumbnail( $post ) ) {
					$article['image'] = get_the_post_thumbnail_url( $post->ID, 'full' );
				}
				$graphs[] = $article;
			} elseif ( is_singular( 'product' ) && function_exists( 'wc_get_product' ) && ( ! function_exists( 'WC' ) || empty( WC()->structured_data ) ) ) {
				$product = wc_get_product( $post->ID );
				if ( $product ) {
					$prod_schema = [
						'@type'       => 'Product',
						'name'        => $product->get_name(),
						'description' => wp_trim_words( wp_strip_all_tags( $product->get_short_description() ?: $product->get_description() ), 40, '...' ),
						'sku'         => $product->get_sku(),
						'offers'      => [
							'@type'         => 'Offer',
							'priceCurrency' => function_exists( 'get_woocommerce_currency' ) ? get_woocommerce_currency() : 'USD',
							'price'         => $product->get_price(),
							'availability'  => $product->is_in_stock() ? 'https://schema.org/InStock' : 'https://schema.org/OutOfStock',
							'url'           => get_permalink( $post ),
						],
					];
					if ( has_post_thumbnail( $post ) ) {
						$prod_schema['image'] = get_the_post_thumbnail_url( $post->ID, 'full' );
					}
					$graphs[] = $prod_schema;
				}
			}
		}

		if ( ! empty( $graphs ) ) {
			$payload = [
				'@context' => 'https://schema.org',
				'@graph'   => $graphs,
			];
			echo '<script type="application/ld+json">' . wp_json_encode( $payload, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES | JSON_HEX_TAG ) . '</script>' . "\n";
		}
	}
}

new AIO_Optimizer();

if ( ! function_exists( 'aio_convert_single_file_to_webp' ) ) {
	function aio_convert_single_file_to_webp( $src_path, $webp_path, $mime_type ) {
		if ( ! file_exists( $src_path ) ) {
			return false;
		}

		$success = false;

		if ( function_exists( 'imagewebp' ) ) {
			$image = null;
			if ( 'image/jpeg' === $mime_type && function_exists( 'imagecreatefromjpeg' ) ) {
				$image = @imagecreatefromjpeg( $src_path );
			} elseif ( 'image/png' === $mime_type && function_exists( 'imagecreatefrompng' ) ) {
				$image = @imagecreatefrompng( $src_path );
			}

			if ( $image ) {
				if ( function_exists( 'imagepalettetotruecolor' ) ) {
					@imagepalettetotruecolor( $image );
				}
				if ( 'image/png' === $mime_type ) {
					@imagealphablending( $image, false );
					@imagesavealpha( $image, true );
				}
				$success = @imagewebp( $image, $webp_path, 85 );
				@imagedestroy( $image );
			}
		}

		if ( ! $success || ! file_exists( $webp_path ) || filesize( $webp_path ) < 100 ) {
			$editor = wp_get_image_editor( $src_path );
			if ( ! is_wp_error( $editor ) ) {
				$editor->set_quality( 85 );
				$saved   = $editor->save( $webp_path, 'image/webp' );
				$success = ! is_wp_error( $saved );
			}
		}

		return $success && file_exists( $webp_path ) && filesize( $webp_path ) > 100;
	}
}

if ( ! function_exists( 'aio_generate_webp_for_attachment' ) ) {
	function aio_generate_webp_for_attachment( $attachment_id, $delete_original = false ) {
		$file_path = get_attached_file( $attachment_id );
		if ( ! $file_path || ! file_exists( $file_path ) ) {
			return false;
		}

		$filetype  = wp_check_filetype( $file_path );
		$mime_type = ! empty( $filetype['type'] ) ? $filetype['type'] : ( function_exists( 'mime_content_type' ) ? mime_content_type( $file_path ) : '' );
		if ( ! in_array( $mime_type, [ 'image/jpeg', 'image/png' ], true ) ) {
			return false;
		}

		$path_info     = pathinfo( $file_path );
		$base_dir      = $path_info['dirname'];
		$webp_filename = $path_info['filename'] . '.webp';
		$webp_path     = $base_dir . '/' . $webp_filename;

		// Prevent filename collision when both banner.jpg and banner.png exist in the same folder
		$use_basename_suffix = false;
		if ( file_exists( $webp_path ) && $webp_path !== $file_path ) {
			$use_basename_suffix = true;
			$webp_filename       = $path_info['basename'] . '.webp';
			$webp_path           = $base_dir . '/' . $webp_filename;
		}

		if ( ! aio_convert_single_file_to_webp( $file_path, $webp_path, $mime_type ) ) {
			return [ 'success' => false ];
		}

		$total_orig_bytes = (int) filesize( $file_path );
		$total_webp_bytes = (int) filesize( $webp_path );

		// Also convert all generated WordPress & WooCommerce intermediate image sizes
		$metadata        = wp_get_attachment_metadata( $attachment_id );
		$converted_files = [];

		if ( is_array( $metadata ) ) {
			if ( ! empty( $metadata['file'] ) ) {
				$meta_dir         = pathinfo( $metadata['file'], PATHINFO_DIRNAME );
				$metadata['file'] = ( $meta_dir && '.' !== $meta_dir ? $meta_dir . '/' : '' ) . $webp_filename;
			}

			if ( ! empty( $metadata['sizes'] ) && is_array( $metadata['sizes'] ) ) {
				foreach ( $metadata['sizes'] as $size_key => $size_info ) {
					if ( empty( $size_info['file'] ) ) {
						continue;
					}
					$sub_src  = $base_dir . '/' . $size_info['file'];
					$sub_info = pathinfo( $sub_src );
					$sub_name = $use_basename_suffix ? ( $sub_info['basename'] . '.webp' ) : ( $sub_info['filename'] . '.webp' );
					$sub_webp = $base_dir . '/' . $sub_name;
					if ( ! $use_basename_suffix && file_exists( $sub_webp ) && $sub_webp !== $sub_src ) {
						$sub_webp = $base_dir . '/' . $sub_info['basename'] . '.webp';
					}

					if ( isset( $converted_files[ $sub_src ] ) ) {
						$metadata['sizes'][ $size_key ]['file']      = basename( $converted_files[ $sub_src ] );
						$metadata['sizes'][ $size_key ]['mime-type'] = 'image/webp';
						continue;
					}

					if ( file_exists( $sub_src ) && aio_convert_single_file_to_webp( $sub_src, $sub_webp, $mime_type ) ) {
						$total_orig_bytes += (int) filesize( $sub_src );
						$total_webp_bytes += (int) filesize( $sub_webp );
						$converted_files[ $sub_src ]                 = $sub_webp;
						$metadata['sizes'][ $size_key ]['file']      = basename( $sub_webp );
						$metadata['sizes'][ $size_key ]['mime-type'] = 'image/webp';
					}
				}
			}

			wp_update_attachment_metadata( $attachment_id, $metadata );
		}

		update_attached_file( $attachment_id, $webp_path );

		global $wpdb;
		// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
		$wpdb->update(
			$wpdb->posts,
			[ 'post_mime_type' => 'image/webp' ],
			[ 'ID' => $attachment_id ],
			[ '%s' ],
			[ '%d' ]
		);

		if ( $delete_original ) {
			foreach ( array_keys( $converted_files ) as $old_thumb ) {
				if ( $old_thumb !== $webp_path && file_exists( $old_thumb ) ) {
					wp_delete_file( $old_thumb );
				}
			}
			if ( $file_path !== $webp_path && file_exists( $file_path ) ) {
				wp_delete_file( $file_path );
			}
		}

		return [
			'success'       => true,
			'original_size' => $total_orig_bytes,
			'webp_size'     => $total_webp_bytes,
		];
	}
}