<?php
/**
 * Activation, deactivation and lazy per-site installation.
 *
 * @package Unbreak
 */

namespace Unbreak\Install;

use Unbreak\Queue\Jobs;

defined( 'ABSPATH' ) || exit;

/**
 * Plugin lifecycle hooks. Everything here must stay fast: no scanning happens inline.
 */
final class Lifecycle {

	/**
	 * Set when a full site extraction should be enqueued as soon as Action Scheduler is ready.
	 */
	public const FULL_SCAN_FLAG = 'unbreak_needs_full_scan';

	/**
	 * Set once after activation to show a single dismissible admin notice.
	 */
	public const NOTICE_FLAG = 'unbreak_activation_notice';

	/**
	 * How many sites to set up inline on network activation. The rest install lazily on first load.
	 */
	private const NETWORK_INLINE_SITES = 25;

	/**
	 * Activation hook.
	 *
	 * @param bool $network_wide Whether the plugin is being network-activated.
	 */
	public static function activate( $network_wide = false ): void {
		if ( is_multisite() && $network_wide ) {
			$site_ids = get_sites(
				array(
					'fields' => 'ids',
					'number' => self::NETWORK_INLINE_SITES,
				)
			);
			foreach ( $site_ids as $site_id ) {
				switch_to_blog( (int) $site_id );
				self::activate_site();
				restore_current_blog();
			}
			return;
		}
		self::activate_site();
	}

	/**
	 * Install tables for the current site and request a full scan.
	 */
	public static function activate_site(): void {
		self::maybe_update_schema();
		self::ensure_options();
		update_option( self::FULL_SCAN_FLAG, 1, true );
		update_option( self::NOTICE_FLAG, 1, true );
	}

	/**
	 * Runs on every load (cheap: autoloaded option). Installs tables lazily, e.g. for new network sites.
	 */
	public static function maybe_update_schema(): void {
		$installed = (int) get_option( Schema::OPTION, 0 );
		if ( Schema::VERSION === $installed ) {
			return;
		}
		Schema::install( $installed );
		self::ensure_options();
		if ( 0 === $installed ) {
			update_option( self::FULL_SCAN_FLAG, 1, true );
		}
	}

	/**
	 * Create every option that front-end requests may read, autoloaded. A missing option costs one
	 * query per page view (WordPress caches only existing autoloaded options).
	 */
	public static function ensure_options(): void {
		add_option( self::FULL_SCAN_FLAG, 0, '', true );
		add_option( \Unbreak\Check\CheckRunner::PAUSED, 0, '', true );
		add_option( \Unbreak\Support\Settings::OPTION, \Unbreak\Support\Settings::sanitize( \Unbreak\Support\Settings::defaults() ), '', true );
	}

	/**
	 * Deactivation hook: stop all background work, keep data (uninstall removes it).
	 *
	 * @param bool $network_wide Whether the plugin is being network-deactivated.
	 */
	public static function deactivate( $network_wide = false ): void {
		if ( is_multisite() && $network_wide ) {
			$site_ids = get_sites(
				array(
					'fields' => 'ids',
					'number' => 0,
				)
			);
			foreach ( $site_ids as $site_id ) {
				switch_to_blog( (int) $site_id );
				self::deactivate_site();
				restore_current_blog();
			}
			return;
		}
		self::deactivate_site();
	}

	/**
	 * Unschedule our jobs on the current site.
	 */
	private static function deactivate_site(): void {
		if ( function_exists( 'as_unschedule_all_actions' ) ) {
			as_unschedule_all_actions( '', array(), Jobs::GROUP );
		}
		delete_transient( 'unbreak_redirect_map_always' );
		delete_transient( 'unbreak_redirect_map_404' );
	}
}