<?php
// PHP 7.4 compatible. No Composer. No build step. WordPress coding standards.
// Editor assets enqueued ONLY on the SLB editor page - never globally (PRD -6).
// Saves via REST route with permission_callback + nonce (PRD -6).

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class SLBUILD_EditorPanel {

	private static $instance = null;
	const REST_NAMESPACE = 'slbuild/v1';
	const MENU_SLUG      = 'slbuild-editor';

	private $hook_suffix = '';

	private function __construct() {}

	public static function instance(): self {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function register_menu(): void {
		$this->hook_suffix = add_menu_page(
			__( 'SLB Editor', 'slb-section-layout-builder' ),
			__( 'SLB Editor', 'slb-section-layout-builder' ),
			'edit_pages',
			self::MENU_SLUG,
			array( $this, 'render_page' ),
			'dashicons-layout',
			80
		);
		// Intercept before WordPress outputs admin chrome - render our own full-screen page.
		add_action( 'load-' . $this->hook_suffix, array( $this, 'intercept_fullscreen' ) );
	}

	/**
	 * Fires before WordPress outputs the admin header for our page.
	 * Renders the full-screen editor and exits - render_page() is never reached.
	 */
	public function intercept_fullscreen(): void {
		$this->render_fullscreen_page();
		exit();
	}

	public function register_rest_routes(): void {
		register_rest_route(
			self::REST_NAMESPACE,
			'/save',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_save' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/save-draft',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_save_draft' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/sections',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'rest_get_sections' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/context',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'rest_get_context' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/publish',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_publish' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/preview-token',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_create_preview_token' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/page/(?P<post_id>\d+)',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'rest_get_page' ),
				'permission_callback' => array( $this, 'rest_permission' ),
				'args'                => array(
					'post_id' => array(
						'validate_callback' => function( $v ) {
							return is_numeric( $v ) && $v > 0;
						},
					),
				),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/page-settings',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_save_page_settings' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/save-global',
			array(
				'methods'             => 'POST',
				'callback'            => array( $this, 'rest_save_global_region' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/global-region',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'rest_get_global_region' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);

		register_rest_route(
			self::REST_NAMESPACE,
			'/global-regions',
			array(
				'methods'             => 'GET',
				'callback'            => array( $this, 'rest_get_global_regions' ),
				'permission_callback' => array( $this, 'rest_permission' ),
			)
		);
	}

	/**
	 * Merge plugin starter-sections with theme sections. Theme always wins on slug collision.
	 *
	 * @param array $ctx Resolved context from Resolver::resolve().
	 * @return array slug => schema map
	 */
	private function get_merged_schemas( array $ctx ): array {
		$parser  = new SLBUILD_SchemaParser();
		$schemas = array();

		if ( ! empty( $ctx['starter_sections_dir'] ) ) {
			$schemas = $parser->scan_dir( $ctx['starter_sections_dir'] );
		}

		// Theme schemas override starter schemas for any matching slug.
		$theme_schemas = $parser->scan_dir( $ctx['sections_dir'] );
		$schemas       = array_merge( $schemas, $theme_schemas );

		// Inject Advanced CSS system fields into every schema so the editor shows them.
		$system_fields = array(
			array( 'id' => 'slbuild_margin',  'type' => 'spacing_box', 'label' => 'Margin',  'default' => '', 'system' => true ),
			array( 'id' => 'slbuild_padding', 'type' => 'spacing_box', 'label' => 'Padding', 'default' => '', 'system' => true ),
			array( 'id' => 'slbuild_z_index', 'type' => 'number',      'label' => 'Z-Index', 'default' => '', 'system' => true ),
		);
		foreach ( $schemas as $slug => $schema ) {
			$schemas[ $slug ]['settings'] = array_merge(
				$schema['settings'] ?? array(),
				$system_fields
			);
			// F20 - resolve preview_image to full URL for the picker.
			if ( ! empty( $schema['preview_image'] ) ) {
				$schemas[ $slug ]['preview_url'] = SLBUILD_URL . 'assets/previews/' . sanitize_file_name( $schema['preview_image'] );
			}
		}

		return $schemas;
	}

	/**
	 * POST /wp-json/slbuild/v1/save-draft
	 * Saves draft without required-field validation - used by live preview debounce.
	 * Body: { post_id, layout, instances }
	 */
	public function rest_save_draft( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$post_id   = (int) $request->get_param( 'post_id' );
		$layout    = $request->get_param( 'layout' );
		$instances = $request->get_param( 'instances' );

		if ( ! $post_id || ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		if ( ! is_array( $layout ) )    { $layout    = array(); }
		if ( ! is_array( $instances ) ) { $instances = array(); }

		$store = new SLBUILD_DataStore();
		$store->save_draft( $post_id, $layout, $instances );

		return new WP_REST_Response( array( 'success' => true ), 200 );
	}

	public function rest_permission(): bool {
		return current_user_can( 'edit_pages' );
	}

	/**
	 * Validate required fields across all instances in the layout.
	 * Returns an array of human-readable error strings (empty = valid).
	 *
	 * @param int   $post_id
	 * @param array $layout
	 * @param array $instances
	 * @return string[]
	 */
	private function validate_required_fields( int $post_id, array $layout, array $instances ): array {
		$ctx     = SLBUILD_Resolver::instance()->resolve( $post_id );
		$schemas = $this->get_merged_schemas( $ctx );
		$errors  = array();

		foreach ( $layout as $item ) {
			$type        = $item['type'] ?? '';
			$instance_id = $item['instance'] ?? '';
			$schema      = $schemas[ $type ] ?? null;
			if ( ! $schema ) {
				continue;
			}
			$section_name = $schema['name'] ?? $type;
			$values       = $instances[ $instance_id ]['settings'] ?? array();

			foreach ( ( $schema['settings'] ?? array() ) as $field ) {
				$fid   = $field['id'] ?? '';
				if ( ! $fid ) {
					continue; // organizer fields (header/paragraph) have no id
				}
				$value = (string) ( $values[ $fid ] ?? '' );
				$label = $field['label'] ?? $fid;

				// Legacy required flag
				if ( ! empty( $field['required'] ) && '' === $value ) {
					$errors[] = "{$section_name}: {$label} is required";
					continue; // skip further rules if empty required
				}

				// F17 - validation rules
				$rules = $field['validation'] ?? array();
				if ( empty( $rules ) ) {
					continue;
				}
				if ( ! empty( $rules['required'] ) && '' === $value ) {
					$errors[] = "{$section_name}: {$label} is required";
					continue;
				}
				if ( isset( $rules['min_length'] ) && '' !== $value && strlen( $value ) < (int) $rules['min_length'] ) {
					$errors[] = "{$section_name}: {$label} must be at least {$rules['min_length']} characters";
				}
				if ( isset( $rules['max_length'] ) && strlen( $value ) > (int) $rules['max_length'] ) {
					$errors[] = "{$section_name}: {$label} exceeds the {$rules['max_length']}-character limit";
				}
				if ( isset( $rules['min'] ) && '' !== $value && is_numeric( $value ) && (float) $value < (float) $rules['min'] ) {
					$errors[] = "{$section_name}: {$label} must be at least {$rules['min']}";
				}
				if ( isset( $rules['max'] ) && '' !== $value && is_numeric( $value ) && (float) $value > (float) $rules['max'] ) {
					$errors[] = "{$section_name}: {$label} cannot exceed {$rules['max']}";
				}
			}
		}

		return $errors;
	}

	/**
	 * POST /wp-json/slbuild/v1/save
	 * Body: { post_id, layout, instances, _wpnonce }
	 */
	public function rest_save( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$post_id   = (int) $request->get_param( 'post_id' );
		$layout    = $request->get_param( 'layout' );
		$instances = $request->get_param( 'instances' );

		if ( ! $post_id || ! is_array( $layout ) || ! is_array( $instances ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid request data' ), 400 );
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		$errors = $this->validate_required_fields( $post_id, $layout, (array) $instances );
		if ( ! empty( $errors ) ) {
			return new WP_REST_Response(
				array( 'error' => implode( '; ', $errors ), 'required_errors' => $errors ),
				422
			);
		}

		$store = new SLBUILD_DataStore();
		$store->save_draft( $post_id, $layout, $instances );

		return new WP_REST_Response( array( 'success' => true, 'status' => 'draft' ), 200 );
	}

	/**
	 * POST /wp-json/slbuild/v1/save-global
	 * Body: { global_region, layout, instances }
	 */
	public function rest_save_global_region( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$region = sanitize_key( (string) $request->get_param( 'global_region' ) );
		if ( ! $region ) {
			return new WP_REST_Response( array( 'error' => 'Missing global_region' ), 400 );
		}

		$layout    = $request->get_param( 'layout' );
		$instances = $request->get_param( 'instances' );

		if ( ! is_array( $layout ) )    { $layout    = array(); }
		if ( ! is_array( $instances ) ) { $instances = array(); }

		$store = new SLBUILD_DataStore();
		$store->save_global( $region, $layout, $instances );

		return new WP_REST_Response( array( 'success' => true ), 200 );
	}

	/**
	 * GET /wp-json/slbuild/v1/global-region?region=header
	 * Returns the saved layout + instances for a global region.
	 */
	public function rest_get_global_region( WP_REST_Request $request ): WP_REST_Response {
		$region = sanitize_key( (string) $request->get_param( 'region' ) );
		if ( ! $region ) {
			return new WP_REST_Response( array( 'error' => 'Missing region' ), 400 );
		}

		$store = new SLBUILD_DataStore();
		$raw   = $store->get_global( $region );
		$data  = is_array( $raw ) ? $raw : array( 'layout' => array(), 'instances' => array() );

		if ( empty( $data['instances'] ) || ! is_array( $data['instances'] ) ) {
			$data['instances'] = new stdClass();
		}

		return new WP_REST_Response( array(
			'layout'    => $data['layout']    ?? array(),
			'instances' => $data['instances'],
		), 200 );
	}

	/**
	 * GET /wp-json/slbuild/v1/global-regions
	 * Returns all available global regions (from theme gs_*.php files + any saved regions).
	 */
	public function rest_get_global_regions( WP_REST_Request $request ): WP_REST_Response {
		$ctx    = SLBUILD_Resolver::instance()->resolve( null );
		$store  = new SLBUILD_DataStore();
		$seen   = array();
		$result = array();

		// Scan theme sections dir for gs_*.php files.
		$sections_dir = $ctx['sections_dir'] ?? '';
		if ( $sections_dir && is_dir( $sections_dir ) ) {
			$parser = new SLBUILD_SchemaParser();
			foreach ( glob( $sections_dir . '/gs_*.php' ) ?: array() as $file ) {
				$slug = preg_replace( '/^gs_/', '', basename( $file, '.php' ) );
				if ( isset( $seen[ $slug ] ) ) { continue; }
				$seen[ $slug ] = true;
				$schema = $parser->parse_file( $file );
				$result[] = array(
					'slug'  => $slug,
					'label' => ( $schema && isset( $schema['name'] ) ) ? $schema['name'] : ucwords( str_replace( '-', ' ', $slug ) ),
				);
			}
		}

		// Also include any regions with saved data but no gs_ file.
		foreach ( $store->get_all_global_region_keys() as $slug ) {
			if ( isset( $seen[ $slug ] ) ) { continue; }
			$result[] = array(
				'slug'  => $slug,
				'label' => ucwords( str_replace( '-', ' ', $slug ) ),
			);
		}

		usort( $result, function ( $a, $b ) { return strcmp( $a['label'], $b['label'] ); } );

		return new WP_REST_Response( $result, 200 );
	}

	/**
	 * POST /wp-json/slbuild/v1/page-settings
	 * Body: { post_id, header, footer }
	 */
	public function rest_save_page_settings( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$post_id = (int) $request->get_param( 'post_id' );
		if ( ! $post_id ) {
			return new WP_REST_Response( array( 'error' => 'Missing post_id' ), 400 );
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		$store = new SLBUILD_DataStore();
		$store->save_page_settings( $post_id, array(
			'header' => (string) $request->get_param( 'header' ),
			'footer' => (string) $request->get_param( 'footer' ),
		) );

		return new WP_REST_Response( array( 'success' => true ), 200 );
	}

	/**
	 * GET /wp-json/slbuild/v1/sections
	 * Returns all available sections with their schemas.
	 */
	public function rest_get_sections( WP_REST_Request $request ): WP_REST_Response {
		$ctx     = SLBUILD_Resolver::instance()->resolve();
		$schemas = $this->get_merged_schemas( $ctx );
		return new WP_REST_Response( $schemas, 200 );
	}

	/**
	 * GET /wp-json/slbuild/v1/context
	 * Returns WooCommerce products and categories for editor dropdowns.
	 */
	public function rest_get_context( WP_REST_Request $request ): WP_REST_Response {
		return new WP_REST_Response( $this->build_woo_context(), 200 );
	}

	/**
	 * Build the WooCommerce context array for the editor.
	 */
	private function build_woo_context(): array {
		$context = array( 'products' => array(), 'categories' => array(), 'pages' => array() );

		$all_pages = get_posts( array(
			'post_type'      => 'page',
			'post_status'    => 'publish',
			'posts_per_page' => 200,
			'orderby'        => 'title',
			'order'          => 'ASC',
			'fields'         => 'ids',
		) );
		foreach ( $all_pages as $pid ) {
			$context['pages'][] = array( 'id' => $pid, 'title' => get_the_title( $pid ) );
		}

		if ( ! class_exists( 'WooCommerce' ) ) {
			return $context;
		}
		$products = get_posts( array(
			'post_type'      => 'product',
			'posts_per_page' => 200,
			'post_status'    => 'publish',
			'orderby'        => 'title',
			'order'          => 'ASC',
			'fields'         => 'ids',
		) );
		foreach ( $products as $id ) {
			$context['products'][] = array( 'id' => $id, 'name' => get_the_title( $id ) );
		}
		$cats = get_terms( array( 'taxonomy' => 'product_cat', 'hide_empty' => false, 'number' => 200 ) );
		if ( ! is_wp_error( $cats ) ) {
			foreach ( $cats as $cat ) {
				$context['categories'][] = array( 'id' => $cat->term_id, 'name' => $cat->name );
			}
		}
		return $context;
	}

	/**
	 * GET /wp-json/slbuild/v1/page/{post_id}
	 * Returns the layout and instance values for a page.
	 */
	public function rest_get_page( WP_REST_Request $request ): WP_REST_Response {
		$post_id = (int) $request->get_param( 'post_id' );

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		$store = new SLBUILD_DataStore();
		$data  = $store->get_page_data( $post_id );
		return new WP_REST_Response( $data, 200 );
	}

	/**
	 * POST /wp-json/slbuild/v1/publish
	 * Saves the current state to draft then promotes draft to live.
	 * Body: { post_id, layout, instances }
	 */
	public function rest_publish( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$post_id   = (int) $request->get_param( 'post_id' );
		$layout    = $request->get_param( 'layout' );
		$instances = $request->get_param( 'instances' );

		if ( ! $post_id || ! is_array( $layout ) || ! is_array( $instances ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid request data' ), 400 );
		}

		if ( ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		$errors = $this->validate_required_fields( $post_id, $layout, (array) $instances );
		if ( ! empty( $errors ) ) {
			return new WP_REST_Response(
				array( 'error' => implode( '; ', $errors ), 'required_errors' => $errors ),
				422
			);
		}

		$store = new SLBUILD_DataStore();
		$store->save_draft( $post_id, $layout, $instances );
		$store->publish( $post_id );

		return new WP_REST_Response( array( 'success' => true, 'status' => 'published' ), 200 );
	}

	/**
	 * POST /wp-json/slbuild/v1/preview-token
	 * Generates a 7-day shareable preview token for logged-out client review.
	 * Body: { post_id }
	 */
	public function rest_create_preview_token( WP_REST_Request $request ): WP_REST_Response {
		$nonce = $request->get_header( 'X-WP-Nonce' );
		if ( ! wp_verify_nonce( (string) $nonce, 'wp_rest' ) ) {
			return new WP_REST_Response( array( 'error' => 'Invalid nonce' ), 403 );
		}

		$post_id = (int) $request->get_param( 'post_id' );
		if ( ! $post_id || ! current_user_can( 'edit_post', $post_id ) ) {
			return new WP_REST_Response( array( 'error' => 'Forbidden' ), 403 );
		}

		$token = bin2hex( random_bytes( 32 ) );
		set_transient( 'slbuild_preview_' . $post_id, $token, 7 * DAY_IN_SECONDS );

		$url = add_query_arg( 'slbuild_preview_token', $token, get_permalink( $post_id ) );

		return new WP_REST_Response( array(
			'url'        => $url,
			'expires_in' => 7 * DAY_IN_SECONDS,
		), 200 );
	}

	/**
	 * Fallback callback for add_menu_page - never reached; intercept_fullscreen() exits first.
	 */
	public function render_page(): void {
		echo '<div class="wrap"><p>' . esc_html__( 'SLB Editor requires JavaScript.', 'slb-section-layout-builder' ) . '</p></div>';
	}

	/**
	 * Determine the page type for the given post ID.
	 * Returns one of: front_page, shop, cart, checkout, my_account, product, page.
	 */
	private function resolve_page_type( int $post_id ): string {
		if ( ! $post_id ) {
			return 'page';
		}
		if ( (int) get_option( 'page_on_front' ) === $post_id ) {
			return 'front_page';
		}
		if ( function_exists( 'wc_get_page_id' ) ) {
			$wc_map = array(
				'shop'      => 'shop',
				'cart'      => 'cart',
				'checkout'  => 'checkout',
				'myaccount' => 'my_account',
			);
			foreach ( $wc_map as $wc_key => $type ) {
				if ( (int) wc_get_page_id( $wc_key ) === $post_id ) {
					return $type;
				}
			}
		}
		if ( get_post_type( $post_id ) === 'product' ) {
			return 'product';
		}
		return 'page';
	}

	/**
	 * Outputs the full-screen editor HTML page (no WP admin chrome).
	 */
	public function render_fullscreen_page(): void {
		if ( ! current_user_can( 'edit_pages' ) ) {
			wp_die( esc_html__( 'You do not have sufficient permissions to access this page.', 'slb-section-layout-builder' ) );
		}

		$post_id       = isset( $_GET['post_id'] ) ? (int) $_GET['post_id'] : 0; // phpcs:ignore WordPress.Security.NonceVerification
		$global_region = isset( $_GET['global_region'] ) ? sanitize_key( $_GET['global_region'] ) : ''; // phpcs:ignore WordPress.Security.NonceVerification
		$return_to     = isset( $_GET['return_to'] ) ? (int) $_GET['return_to'] : 0; // phpcs:ignore WordPress.Security.NonceVerification
		$ctx           = SLBUILD_Resolver::instance()->resolve( $post_id ?: null );
		$schemas       = $this->get_merged_schemas( $ctx );
		$store         = new SLBUILD_DataStore();

		if ( $global_region ) {
			$raw       = $store->get_global( $global_region );
			$page_data = is_array( $raw ) ? $raw : array( 'layout' => array(), 'instances' => array() );
		} elseif ( $post_id ) {
			$page_data = $store->get_draft_data( $post_id );
		} else {
			$page_data = array( 'layout' => array(), 'instances' => array() );
		}

		$preview_url = add_query_arg( array( 'slbuild_preview' => '1' ), $post_id ? get_permalink( $post_id ) : home_url( '/' ) );
		$slbuild_pages   = $this->get_slbuild_pages();
		// Ensure the page currently being edited always appears in the switcher,
		// even if it isn't published yet or doesn't have SLB data saved.
		if ( $post_id ) {
			$in_list = false;
			foreach ( $slbuild_pages as $p ) {
				if ( (int) $p['id'] === $post_id ) { $in_list = true; break; }
			}
			if ( ! $in_list ) {
				$base_url = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $post_id );
				array_unshift( $slbuild_pages, array(
					'id'      => $post_id,
					'title'   => get_the_title( $post_id ),
					'editUrl' => $base_url,
				) );
			}
		}

		if ( empty( $page_data['instances'] ) || ! is_array( $page_data['instances'] ) ) {
			$page_data['instances'] = new stdClass();
		}

		$woo_active = class_exists( 'WooCommerce' );
		$woo_fields = array( 'product', 'product_list', 'category', 'collection_source' );
		$needs_woo  = false;
		foreach ( $schemas as $schema ) {
			foreach ( $schema['settings'] ?? array() as $field ) {
				if ( in_array( $field['type'] ?? '', $woo_fields, true ) ) {
					$needs_woo = true;
					break 2;
				}
			}
		}

		wp_enqueue_media();
		wp_enqueue_style( 'buttons' );
		wp_enqueue_style( 'slbuild-editor', SLBUILD_URL . 'assets/editor.css', array(), SLBUILD_VERSION );
		wp_enqueue_script( 'slbuild-editor', SLBUILD_URL . 'assets/editor.js', array(), SLBUILD_VERSION, true );
		$store = new SLBUILD_DataStore();
		wp_localize_script(
			'slbuild-editor',
			'SLBuild',
			array(
				'restUrl'      => esc_url_raw( rest_url( self::REST_NAMESPACE ) ),
				'nonce'        => wp_create_nonce( 'wp_rest' ),
				'postId'       => $post_id,
				'globalRegion' => $global_region,
				'returnTo'     => $return_to ?: $post_id,
				'schemas'      => $schemas,
				'pageData'   => $page_data,
				'previewUrl' => esc_url( $preview_url ),
				'wooActive'  => $woo_active,
				'needsWoo'   => $needs_woo,
				'context'    => $this->build_woo_context(),
				'slbPages'   => $slbuild_pages,
				'pageType'      => $this->resolve_page_type( $post_id ),
				'themeManifest' => SLBUILD_Resolver::instance()->get_theme_manifest(),
				'pageSettings'  => $post_id ? $store->get_page_settings( $post_id ) : array( 'header' => 'default', 'footer' => 'default' ),
				'adminUrl'      => admin_url(),
				'connectedFields' => SLBUILD_SettingsHooks::get_connected_fields(),
				'previewsUrl'     => SLBUILD_URL . 'assets/previews/',
				'i18n'       => array(
					'save'         => __( 'Save', 'slb-section-layout-builder' ),
					'saved'        => __( 'Saved', 'slb-section-layout-builder' ),
					'saving'       => __( 'Saving...', 'slb-section-layout-builder' ),
					'addSection'   => __( '+ Add Section', 'slb-section-layout-builder' ),
					'noSections'   => __( 'No sections found in theme.', 'slb-section-layout-builder' ),
					'wooTitle'     => __( 'WooCommerce Required', 'slb-section-layout-builder' ),
					'wooMessage'   => __( 'One or more sections on this page require WooCommerce. WooCommerce is not active - those sections will render empty. Continue anyway?', 'slb-section-layout-builder' ),
					'wooContinue'  => __( 'Continue Anyway', 'slb-section-layout-builder' ),
					'wooCancel'    => __( 'Cancel', 'slb-section-layout-builder' ),
					'publish'      => __( 'Publish', 'slb-section-layout-builder' ),
					'publishing'   => __( 'Publishing-', 'slb-section-layout-builder' ),
					'published'    => __( 'Published!', 'slb-section-layout-builder' ),
					'discard'      => __( 'Discard', 'slb-section-layout-builder' ),
					'discardConfirm' => __( 'Discard all unsaved changes?', 'slb-section-layout-builder' ),
					'autosaved'    => __( 'Autosaved', 'slb-section-layout-builder' ),
				),
			)
		);

		while ( ob_get_level() > 0 ) {
			ob_end_clean();
		}
		nocache_headers();
		?>
<!DOCTYPE html>
<html <?php language_attributes(); ?>>
<head>
<meta charset="<?php bloginfo( 'charset' ); ?>">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title><?php echo $post_id ? esc_html( get_the_title( $post_id ) ) . ' &mdash; ' : ''; ?>SLB Editor</title>
<?php wp_print_styles(); wp_print_head_scripts(); ?>
</head>
<body class="slb-fullscreen">

<div id="slb-woo-modal" class="slb-modal-overlay" style="display:none;">
	<div class="slb-modal">
		<div class="slb-modal-icon">&#9888;&#65039;</div>
		<h2 class="slb-modal-title"><?php esc_html_e( 'WooCommerce Required', 'slb-section-layout-builder' ); ?></h2>
		<p class="slb-modal-message"><?php esc_html_e( 'One or more sections on this page require WooCommerce. WooCommerce is not active - those sections will render empty. Continue anyway?', 'slb-section-layout-builder' ); ?></p>
		<div class="slb-modal-actions">
			<button id="slb-woo-cancel" class="button"><?php esc_html_e( 'Cancel', 'slb-section-layout-builder' ); ?></button>
			<button id="slb-woo-continue" class="button button-primary"><?php esc_html_e( 'Continue Anyway', 'slb-section-layout-builder' ); ?></button>
		</div>
	</div>
</div>

<div id="slb-topbar">
	<div class="slb-topbar-left">
		<?php
		if ( $global_region && $return_to ) {
			$back_url = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $return_to );
		} else {
			$back_url = admin_url();
		}
		?>
		<a href="<?php echo esc_url( $back_url ); ?>" class="slb-topbar-back">&#8592;</a>
		<button id="slb-sections-btn" type="button" class="slb-nav-tab slb-active"><?php esc_html_e( 'Sections', 'slb-section-layout-builder' ); ?></button>
		<button id="slb-page-settings-btn" type="button" class="slb-nav-tab"><?php esc_html_e( 'Page Settings', 'slb-section-layout-builder' ); ?></button>
		<button id="slb-global-settings-btn" type="button" class="slb-nav-tab"><?php esc_html_e( 'Global Settings', 'slb-section-layout-builder' ); ?></button>
	</div>
	<div class="slb-topbar-center">
		<div id="slb-page-switcher-wrap"></div>
		<div id="slb-device-group">
			<button type="button" class="slb-device-btn" data-width="375" title="<?php esc_attr_e( 'Mobile (375px)', 'slb-section-layout-builder' ); ?>"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="7" y="2" width="10" height="20" rx="2"/><line x1="12" y1="18" x2="12.01" y2="18"/></svg></button>
			<button type="button" class="slb-device-btn" data-width="768" title="<?php esc_attr_e( 'Tablet (768px)', 'slb-section-layout-builder' ); ?>"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="4" y="2" width="16" height="20" rx="2"/><line x1="12" y1="18" x2="12.01" y2="18"/></svg></button>
			<button type="button" class="slb-device-btn slb-active" data-width="0" title="<?php esc_attr_e( 'Desktop (full width)', 'slb-section-layout-builder' ); ?>"><svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="2" y="3" width="20" height="14" rx="2"/><polyline points="8 21 16 21"/><line x1="12" y1="17" x2="12" y2="21"/></svg></button>
		</div>
	</div>
	<div class="slb-topbar-right">
		<button id="slb-undo-btn" type="button" class="slb-topbar-btn slb-topbar-undoredo" title="<?php esc_attr_e( 'Undo (Ctrl+Z)', 'slb-section-layout-builder' ); ?>" disabled>&#8617;</button>
		<button id="slb-redo-btn" type="button" class="slb-topbar-btn slb-topbar-undoredo" title="<?php esc_attr_e( 'Redo (Ctrl+Y)', 'slb-section-layout-builder' ); ?>" disabled>&#8618;</button>
		<button id="slb-preview-link-btn" type="button" class="slb-topbar-btn"><?php esc_html_e( 'Preview Link', 'slb-section-layout-builder' ); ?></button>
		<button id="slb-preview-btn" type="button" class="slb-topbar-btn"><?php esc_html_e( 'Preview', 'slb-section-layout-builder' ); ?> &#8599;</button>
		<button id="slb-discard-btn" type="button" class="slb-topbar-btn slb-topbar-discard"><?php esc_html_e( 'Discard', 'slb-section-layout-builder' ); ?></button>
		<button id="slb-publish-btn" type="button" class="slb-topbar-btn slb-topbar-publish"><?php esc_html_e( 'Publish Changes', 'slb-section-layout-builder' ); ?></button>
	</div>
</div>

<div id="slb-editor-root">
	<div id="slb-panel">
		<div id="slb-panel-body"></div>
		<div id="slb-panel-save">
			<button id="slb-save" type="button" class="slb-panel-save-btn" disabled><?php esc_html_e( 'Save', 'slb-section-layout-builder' ); ?></button>
		</div>
		<div id="slb-panel-footer">
			<span id="slb-autosave-status" class="slb-autosave-status"></span>
			<?php
			$theme = wp_get_theme();
			echo esc_html( $theme->get( 'Name' ) );
			if ( $post_id ) {
				echo ' &nbsp;|&nbsp; ' . esc_html( get_the_title( $post_id ) );
			}
			?>
		</div>
	</div>
	<div id="slb-preview">
		<div id="slb-preview-bar"></div>
		<div id="slb-preview-wrap">
			<iframe id="slb-preview-frame" src="<?php echo esc_url( $preview_url ); ?>"></iframe>
		</div>
	</div>
</div>

<?php wp_print_footer_scripts(); wp_print_media_templates(); ?>
</body>
</html>
		<?php
	}

	/**
	 * All published pages that have SLB data - for the page switcher dropdown.
	 *
	 * @return array [{id, title, editUrl}]
	 */
	private function get_slbuild_pages(): array {
		$pages = get_posts( array(
			'post_type'      => 'page',
			'post_status'    => 'publish',
			'posts_per_page' => -1,
			'meta_key'       => SLBUILD_DataStore::PAGE_META_KEY, // phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_meta_key
			'orderby'        => 'title',
			'order'          => 'ASC',
		) );
		$result = array();
		foreach ( $pages as $page ) {
			$base_url = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $page->ID );
			$result[] = array(
				'id'      => $page->ID,
				'title'   => $page->post_title,
				'editUrl' => $base_url,
			);
		}
		return $result;
	}

	/**
	 * Adds "Edit with SLB" to the Pages list row actions (pages with SLB data only).
	 *
	 * @param array   $actions
	 * @param WP_Post $post
	 * @return array
	 */
	public function add_page_row_action( array $actions, WP_Post $post ): array {
		if ( $post->post_type !== 'page' || ! current_user_can( 'edit_post', $post->ID ) ) {
			return $actions;
		}
		$data = get_post_meta( $post->ID, SLBUILD_DataStore::PAGE_META_KEY, true );
		if ( empty( $data ) ) {
			return $actions;
		}
		$url               = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $post->ID );
		$actions['slbuild_edit'] = '<a href="' . esc_url( $url ) . '" target="_blank">Edit with SLB</a>';
		return $actions;
	}

	/**
	 * Adds "Edit with SLB" button on the page edit screen (pages with SLB data only).
	 *
	 * @param WP_Post $post
	 */
	public function add_edit_form_button( WP_Post $post ): void {
		if ( $post->post_type !== 'page' || ! current_user_can( 'edit_post', $post->ID ) ) {
			return;
		}
		$data = get_post_meta( $post->ID, SLBUILD_DataStore::PAGE_META_KEY, true );
		if ( empty( $data ) ) {
			return;
		}
		$url = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $post->ID );
		?>
		<div class="slb-edit-with-slb">
			<a href="<?php echo esc_url( $url ); ?>" target="_blank" class="button button-primary button-hero">
				<?php esc_html_e( 'Edit with SLB', 'slb-section-layout-builder' ); ?>
			</a>
		</div>
		<?php
	}

	/**
	 * Enqueued on ALL admin pages (except the SLB full-screen editor itself).
	 * Loads the modal CSS + JS that intercepts "Add New Page" link clicks.
	 */
	public function enqueue_admin_page_flow( string $hook ): void {
		// Skip the SLB editor page - it's full-screen with its own assets.
		if ( $hook === $this->hook_suffix ) {
			return;
		}
		if ( ! current_user_can( 'edit_pages' ) ) {
			return;
		}
		wp_enqueue_style(
			'slbuild-admin-page-flow',
			SLBUILD_URL . 'assets/admin-page-flow.css',
			array(),
			SLBUILD_VERSION
		);
		wp_enqueue_script(
			'slbuild-admin-page-flow',
			SLBUILD_URL . 'assets/admin-page-flow.js',
			array(),
			SLBUILD_VERSION,
			true
		);
		wp_localize_script(
			'slbuild-admin-page-flow',
			'SLBUILD_PageFlow',
			array(
				'wpRestUrl'  => esc_url_raw( rest_url() ),
				'nonce'      => wp_create_nonce( 'wp_rest' ),
				'editorBase' => esc_url_raw( admin_url( 'admin.php?page=' . self::MENU_SLUG ) ),
			)
		);
	}

	/**
	 * Enqueued inside the Gutenberg block editor for pages only.
	 * Injects the "Edit with SLB" button into the editor top bar.
	 */
	public function enqueue_gutenberg_assets(): void {
		$screen = function_exists( 'get_current_screen' ) ? get_current_screen() : null;
		if ( ! $screen || $screen->post_type !== 'page' ) {
			return;
		}
		if ( ! current_user_can( 'edit_pages' ) ) {
			return;
		}
		wp_enqueue_style(
			'slbuild-admin-page-flow',
			SLBUILD_URL . 'assets/admin-page-flow.css',
			array(),
			SLBUILD_VERSION
		);
		wp_enqueue_script(
			'slbuild-gutenberg-btn',
			SLBUILD_URL . 'assets/gutenberg-slb-button.js',
			array( 'wp-dom-ready', 'wp-data' ),
			SLBUILD_VERSION,
			true
		);
		wp_localize_script(
			'slbuild-gutenberg-btn',
			'SLBUILD_GutenbergData',
			array(
				'editorBase' => esc_url_raw( admin_url( 'admin.php?page=' . self::MENU_SLUG ) ),
			)
		);
	}

	/**
	 * Adds "Edit with SLB" to the WP admin bar when viewing an SLB page on the front end.
	 *
	 * @param WP_Admin_Bar $wp_admin_bar
	 */
	public function add_admin_bar_link( WP_Admin_Bar $wp_admin_bar ): void {
		if ( ! is_singular() || ! current_user_can( 'edit_pages' ) || isset( $_GET['slbuild_preview'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification
			return;
		}
		$post_id = get_the_ID();
		$data    = get_post_meta( $post_id, SLBUILD_DataStore::PAGE_META_KEY, true );
		if ( empty( $data ) ) {
			return;
		}
		$url = admin_url( 'admin.php?page=' . self::MENU_SLUG . '&post_id=' . $post_id );
		$wp_admin_bar->add_node( array(
			'id'    => 'slb-edit',
			'title' => 'Edit with SLB',
			'href'  => $url,
			'meta'  => array( 'target' => '_blank' ),
		) );
	}
}