<?php
/**
 * Plugin bootstrap.
 *
 * @package Maintained_Log
 */

namespace Maintained_Log;

defined( 'ABSPATH' ) || exit;

/**
 * Wires every component to WordPress.
 */
final class Plugin {

	/**
	 * Cron hook that diffs the inventory and runs scheduled jobs.
	 */
	const CRON_HOOK = 'maintained_log_cron';

	/**
	 * One-off cron hook that runs the post-update checks.
	 */
	const POST_UPDATE_HOOK = 'maintained_log_post_update';

	/**
	 * Singleton instance.
	 *
	 * @var Plugin|null
	 */
	private static $instance = null;

	/**
	 * Returns the singleton, booting it on first call.
	 *
	 * @return Plugin
	 */
	public static function instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
			self::$instance->boot();
		}
		return self::$instance;
	}

	/**
	 * Capability required to see and manage the log.
	 *
	 * @return string
	 */
	public static function capability() {
		/**
		 * Filters the capability needed to use Maintained.log.
		 *
		 * @param string $capability Default 'manage_options'.
		 */
		return apply_filters( 'maintained_log_capability', 'manage_options' );
	}

	/**
	 * Whether a user can open and manage Maintained.log: they need the
	 * capability and must be one of the people who maintain the site.
	 *
	 * @param int|null $user_id User ID; the current user by default.
	 * @return bool
	 */
	public static function user_can_manage( $user_id = null ) {
		$user_id = null === $user_id ? get_current_user_id() : (int) $user_id;
		/**
		 * Filters whether a user can use Maintained.log.
		 *
		 * @param bool $can     Capability plus "Who maintains this site".
		 * @param int  $user_id User ID.
		 */
		return (bool) apply_filters( 'maintained_log_user_can_manage', Settings::is_maintainer( $user_id ), $user_id );
	}

	/**
	 * Registers hooks.
	 */
	private function boot() {
		Installer::maybe_upgrade();

		Cron_Status::register();
		Rollback::register();
		Performance::register();
		Public_Report::register();
		Vulnerabilities::register();
		Client_Widget::register();
		Update_Listener::register();

		add_action( self::CRON_HOOK, array( __CLASS__, 'run_cron' ) );
		add_action( 'init', array( Installer::class, 'ensure_schedule' ) );
		add_action( self::POST_UPDATE_HOOK, array( __CLASS__, 'run_post_update' ) );

		if ( is_admin() ) {
			Admin\Admin::register();
		}

		if ( defined( 'WP_CLI' ) && WP_CLI ) {
			\WP_CLI::add_command( 'maintained-log', __NAMESPACE__ . '\\CLI' );
		}
	}

	/**
	 * Twice-daily job: catches changes made outside WordPress, alerts and reports.
	 */
	public static function run_cron() {
		Inventory::detect_changes( 'external' );
		Alerts::maybe_send_pending_updates_alert();
		Backups::maybe_send_reminder();
		Tech_Status::refresh();
		Vulnerabilities::maybe_schedule();
		Performance::maybe_schedule();
		Reporter::maybe_send_scheduled();
	}

	/**
	 * Runs the configured checks after an update and alerts on failure.
	 */
	public static function run_post_update() {
		Health_Checks::run( 'post-update' );
	}
}