<?php

declare( strict_types=1 );

namespace AcezSeo\Support;

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

/**
 * Reads the per-post noindex flag of WHICHEVER other SEO plugin
 * `SeoPluginDetector` finds active (M57) — a correctness gap for llms.txt:
 * when a competing SEO plugin is active, this plugin's OWN metatags/canonical
 * already defer to it (`ConflictNotice`), but the llms.txt generator only
 * ever checked its OWN noindex meta, so it could still feed a page to LLMs
 * that the site owner marked noindex through the OTHER plugin.
 *
 * Formats verified against each plugin's own source/docs (same research-first
 * doctrine as the M18 importers; Rank Math additionally confirmed live on
 * this install's `seo-by-rank-math` source):
 * - Yoast SEO: `_yoast_wpseo_meta-robots-noindex` — '1' = noindex, '2' =
 *   index, '0'/missing = post-type default (not our concern here).
 * - Rank Math: `rank_math_robots` — serialized array of strings; noindex
 *   present as the literal 'noindex' entry.
 * - SEOPress: `_seopress_robots_index` — 'yes' means "force noindex" per
 *   SEOPress's own field naming (not live-verified on this install — no
 *   SEOPress site available; degrades to false/no-op if the value format
 *   ever differs, same as an unknown plugin).
 * - All in One SEO (v4): per-post data lives in a CUSTOM TABLE
 *   (`{prefix}aioseo_posts`), not post meta — `robots_default` = 1 means
 *   "use post type defaults" (not our concern here), otherwise
 *   `robots_noindex` decides. Same table AioseoImporter already reads.
 * - Slim SEO: single `slim_seo` post meta array, `noindex` key.
 */
final class ForeignSeoRobots
{
	public static function is_noindex( int $post_id ): bool
	{
		switch ( SeoPluginDetector::detect() )
		{
			case 'Yoast SEO':
				return '1' === (string) get_post_meta( $post_id, '_yoast_wpseo_meta-robots-noindex', true );

			case 'Rank Math':
				return in_array( 'noindex', (array) get_post_meta( $post_id, 'rank_math_robots', true ), true );

			case 'SEOPress':
				return 'yes' === (string) get_post_meta( $post_id, '_seopress_robots_index', true );

			case 'All in One SEO':
				return self::aioseo_noindex( $post_id );

			case 'Slim SEO':
				$data = get_post_meta( $post_id, 'slim_seo', true );

				return is_array( $data ) && ! empty( $data['noindex'] );

			default:
				return false;
		}
	}

	private static function aioseo_noindex( int $post_id ): bool
	{
		global $wpdb;

		$table = $wpdb->prefix . 'aioseo_posts';

		$row = $wpdb->get_row( $wpdb->prepare( 'SELECT robots_default, robots_noindex FROM %i WHERE post_id = %d', $table, $post_id ), ARRAY_A ); // phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching -- read-only SELECT against another plugin's own custom table (WP_Query cannot reach it); one-shot read during import/conflict detection, so caching would only serve stale data. Table name goes through prepare()'s %i identifier placeholder.

		if ( ! is_array( $row ) || ! empty( $row['robots_default'] ) )
		{
			return false;
		}

		return ! empty( $row['robots_noindex'] );
	}
}