<?php
/**
 * Admin monitoring service.
 *
 * @package BlockSieve
 */

namespace BlockSieve\Services;

use BlockSieve\Admin\DashboardWidget;
use BlockSieve\Admin\ReportPage;
use BlockSieve\HookLoader;
use BlockSieve\Monitor\ReportRepository;
use BlockSieve\Settings\Settings;

/**
 * Wires the visibility monitor into wp-admin.
 *
 * Every hook here is admin-only, so the front end is untouched by the reporting
 * feature. Cache invalidation is the one exception: content can change through a
 * REST request or WP-CLI, so those hooks are always registered.
 */
final class AdminService {

	/**
	 * Hook loader.
	 *
	 * @var HookLoader
	 */
	private HookLoader $hooks;

	/**
	 * Report screen.
	 *
	 * @var ReportPage
	 */
	private ReportPage $page;

	/**
	 * Dashboard widget.
	 *
	 * @var DashboardWidget
	 */
	private DashboardWidget $widget;

	/**
	 * Report repository.
	 *
	 * @var ReportRepository
	 */
	private ReportRepository $repository;

	/**
	 * Constructor.
	 *
	 * @param HookLoader       $hooks      Hook loader.
	 * @param ReportPage       $page       Report screen.
	 * @param DashboardWidget  $widget     Dashboard widget.
	 * @param ReportRepository $repository Report repository.
	 */
	public function __construct(
		HookLoader $hooks,
		ReportPage $page,
		DashboardWidget $widget,
		ReportRepository $repository
	) {
		$this->hooks      = $hooks;
		$this->page       = $page;
		$this->widget     = $widget;
		$this->repository = $repository;
	}

	/**
	 * Queues the service's WordPress hooks via the hook loader.
	 *
	 * @return void
	 */
	public function register(): void {
		$this->register_invalidation();

		if ( ! is_admin() ) {
			return;
		}

		$this->hooks->add_action( 'admin_menu', array( $this->page, 'register_menu' ) );
		$this->hooks->add_filter( 'plugin_action_links_' . BLOCKSIEVE_BASENAME, array( $this->page, 'add_action_links' ) );
		$this->hooks->add_action( 'wp_dashboard_setup', array( $this->widget, 'register' ) );
		$this->hooks->add_action( 'admin_enqueue_scripts', array( $this, 'enqueue_styles' ) );
	}

	/**
	 * Queues the cache-invalidation hooks.
	 *
	 * Registered outside the admin too, because content is routinely saved over
	 * the REST API (the block editor) and WP-CLI.
	 *
	 * @return void
	 */
	private function register_invalidation(): void {
		$this->hooks->add_action( 'save_post', array( $this->repository, 'on_post_change' ), 10, 2 );
		$this->hooks->add_action( 'deleted_post', array( $this->repository, 'on_post_change' ), 10, 2 );
		$this->hooks->add_action( 'add_option_widget_block', array( $this->repository, 'invalidate' ) );
		$this->hooks->add_action( 'update_option_widget_block', array( $this->repository, 'invalidate' ) );
		// Moving a widget between sidebars (or to Inactive) only touches this option.
		$this->hooks->add_action( 'update_option_sidebars_widgets', array( $this->repository, 'invalidate' ) );
		$this->hooks->add_action( 'switch_theme', array( $this->repository, 'invalidate' ) );
		// The scan limit and post types shape the report, so any settings write stales it.
		foreach ( array( 'add_option_', 'update_option_', 'delete_option_' ) as $hook ) {
			$this->hooks->add_action( $hook . Settings::OPTION, array( $this->repository, 'invalidate' ) );
		}
	}

	/**
	 * Enqueues the admin stylesheet on the screens that use it.
	 *
	 * @param string $hook_suffix Current admin page hook suffix.
	 * @return void
	 */
	public function enqueue_styles( $hook_suffix ): void {
		$screens = array( 'index.php', 'tools_page_' . ReportPage::SLUG );

		if ( ! in_array( (string) $hook_suffix, $screens, true ) ) {
			return;
		}

		$relative = 'assets/css/admin.css';

		if ( ! is_readable( BLOCKSIEVE_PATH . $relative ) ) {
			return;
		}

		wp_enqueue_style(
			'blocksieve-admin',
			BLOCKSIEVE_URL . $relative,
			array(),
			BLOCKSIEVE_VERSION
		);
	}
}