<?php

declare( strict_types=1 );

namespace AcezSeo\Frontend;

use AcezSeo\Data\GlobalSettingsRepositoryInterface;

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

/**
 * Site-wide "hide from search engines" switch: forces `noindex, nofollow`
 * on every front-end page (late-priority `wp_robots`, overrides any
 * per-post/per-type index setting) and disables the built-in XML sitemap —
 * a hidden site advertising its URLs in a sitemap would be contradictory.
 *
 * This is our own, plugin-scoped equivalent of WordPress's "Discourage
 * search engines" (Settings → Reading); both can coexist safely — robots
 * directives are idempotent.
 */
final class HideFromSearch
{
	private GlobalSettingsRepositoryInterface $settings;

	public function __construct( GlobalSettingsRepositoryInterface $settings )
	{
		$this->settings = $settings;
	}

	public function register(): void
	{
		add_filter( 'wp_robots', array( $this, 'force_noindex' ), 99 );
		add_filter( 'wp_sitemaps_enabled', array( $this, 'maybe_disable_sitemap' ) );
	}

	/**
	 * @param array<string, mixed> $robots
	 *
	 * @return array<string, mixed>
	 */
	public function force_noindex( array $robots ): array
	{
		if ( ! $this->enabled() )
		{
			return $robots;
		}

		$robots['noindex']  = true;
		$robots['nofollow'] = true;
		unset( $robots['index'], $robots['follow'], $robots['max-image-preview'] );

		return $robots;
	}

	public function maybe_disable_sitemap( bool $enabled ): bool
	{
		return $this->enabled() ? false : $enabled;
	}

	private function enabled(): bool
	{
		return (bool) ( $this->settings->get()['hide_from_search'] ?? false );
	}
}