<?php
/**
 * Scan navigation menus for empty / broken C7 shop links.
 *
 * @package C7DBT
 */

defined( 'ABSPATH' ) || exit;

class C7DBT_Menu_Scanner {

	/**
	 * Paths considered empty / needing rewrite.
	 *
	 * @return array
	 */
	private function problematic_paths() {
		return array( '/collection', '/product', 'collection', 'product' );
	}

	/**
	 * Find menu items pointing at empty C7 roots.
	 *
	 * @return array
	 */
	public function find_issues() {
		$issues  = array();
		$menus   = wp_get_nav_menus();
		$bad_set = array_fill_keys( $this->problematic_paths(), true );
		$settings = C7DBT_Settings::get();
		$slug     = C7DBT_Helpers::sanitize_slug( $settings['default_collection_slug'] );

		foreach ( $menus as $menu ) {
			$items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );
			if ( ! $items ) {
				continue;
			}
			foreach ( $items as $item ) {
				$url  = $item->url;
				$path = wp_parse_url( $url, PHP_URL_PATH );
				if ( ! is_string( $path ) ) {
					continue;
				}
				$path_norm = untrailingslashit( '/' . trim( $path, '/' ) );
				$rel       = $this->strip_home_path( $path_norm );

				if ( isset( $bad_set[ $rel ] ) || isset( $bad_set[ ltrim( $rel, '/' ) ] ) ) {
					$issues[] = array(
						'menu_id'   => (int) $menu->term_id,
						'menu_name' => $menu->name,
						'item_id'   => (int) $item->ID,
						'title'     => $item->title,
						'url'       => $url,
						'path'      => $rel,
						'type'      => $item->type,
						'suggested' => $slug ? home_url( '/collection/' . $slug . '/' ) : '',
					);
				}
			}
		}

		return $issues;
	}

	/**
	 * Strip site home path prefix.
	 *
	 * @param string $path Path.
	 * @return string
	 */
	private function strip_home_path( $path ) {
		$home_path = wp_parse_url( home_url( '/' ), PHP_URL_PATH );
		if ( is_string( $home_path ) && '/' !== $home_path && 0 === strpos( $path, rtrim( $home_path, '/' ) ) ) {
			$path = substr( $path, strlen( rtrim( $home_path, '/' ) ) );
			if ( '' === $path ) {
				$path = '/';
			}
		}
		return untrailingslashit( '/' . trim( $path, '/' ) );
	}

	/**
	 * Fix all found menu items to default collection URL without rebuilding the item.
	 *
	 * @return array{fixed:int,skipped:int,messages:array}
	 */
	public function fix_all() {
		$settings = C7DBT_Settings::get();
		$slug     = C7DBT_Helpers::sanitize_slug( $settings['default_collection_slug'] );
		if ( ! $slug ) {
			return array(
				'fixed'    => 0,
				'skipped'  => 0,
				'messages' => array( __( 'Set a default collection slug first.', '7labs-debug-branding-for-commerce7' ) ),
			);
		}

		$target  = home_url( '/collection/' . $slug . '/' );
		$issues  = $this->find_issues();
		$fixed   = 0;
		$skipped = 0;

		foreach ( $issues as $issue ) {
			$item_id = (int) $issue['item_id'];
			if ( $item_id <= 0 || ! get_post( $item_id ) ) {
				++$skipped;
				continue;
			}

			// Prefer meta updates so parent/order/classes stay intact (FixSeal-style safety).
			$ok_url  = update_post_meta( $item_id, '_menu_item_url', esc_url_raw( $target ) );
			$ok_type = update_post_meta( $item_id, '_menu_item_type', 'custom' );
			update_post_meta( $item_id, '_menu_item_object', 'custom' );
			update_post_meta( $item_id, '_menu_item_object_id', 0 );

			if ( false === $ok_url && false === $ok_type ) {
				// Meta unchanged is still success if URL already matched after sanitize.
				$current = get_post_meta( $item_id, '_menu_item_url', true );
				if ( untrailingslashit( (string) $current ) === untrailingslashit( $target ) ) {
					++$fixed;
				} else {
					++$skipped;
				}
			} else {
				++$fixed;
			}

			clean_post_cache( $item_id );
		}

		// Bust menu caches.
		foreach ( wp_get_nav_menus() as $menu ) {
			wp_cache_delete( 'nav_menu_items-' . $menu->term_id, 'nav_menus' );
		}

		return array(
			'fixed'    => $fixed,
			'skipped'  => $skipped,
			'messages' => array(
				sprintf(
					/* translators: 1: fixed count, 2: URL */
					__( 'Updated %1$d menu link(s) to %2$s.', '7labs-debug-branding-for-commerce7' ),
					$fixed,
					$target
				),
			),
		);
	}

	/**
	 * Dashboard status.
	 *
	 * @return array
	 */
	public function status() {
		$issues = $this->find_issues();
		$count  = count( $issues );
		if ( $count > 0 ) {
			return array(
				'status' => 'warn',
				'label'  => __( 'Broken shop menu links', '7labs-debug-branding-for-commerce7' ),
				'detail' => sprintf(
					/* translators: %d: count */
					_n( '%d menu item points to an empty C7 base URL.', '%d menu items point to empty C7 base URLs.', $count, '7labs-debug-branding-for-commerce7' ),
					$count
				),
				'count'  => $count,
			);
		}
		return array(
			'status' => 'ok',
			'label'  => __( 'Menu links look OK', '7labs-debug-branding-for-commerce7' ),
			'detail' => __( 'No nav items point at empty /collection or /product.', '7labs-debug-branding-for-commerce7' ),
			'count'  => 0,
		);
	}
}