<?php
/**
 * Background Updater
 *
 * @version 1.3.2
 * @package RestaurantPress/Classes
 */

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

if ( ! class_exists( 'RP_Background_Process', false ) ) {
	include_once dirname( __FILE__ ) . '/abstracts/class-rp-background-process.php';
}

/**
 * RP_Background_Updater Class.
 */
class RP_Background_Updater extends RP_Background_Process {

	/**
	 * Initiate new background process.
	 */
	public function __construct() {
		// Uses unique prefix per blog so each blog has separate queue.
		$this->prefix = 'wp_' . get_current_blog_id();
		$this->action = 'rp_updater';

		parent::__construct();
	}

	/**
	 * Handle cron healthcheck
	 *
	 * Restart the background process if not already running
	 * and data exists in the queue.
	 */
	public function handle_cron_healthcheck() {
		if ( $this->is_process_running() ) {
			// Background process already running.
			return;
		}

		if ( $this->is_queue_empty() ) {
			// No data to process.
			$this->clear_scheduled_event();
			return;
		}

		$this->handle();
	}

	/**
	 * Schedule fallback event.
	 */
	protected function schedule_event() {
		if ( ! wp_next_scheduled( $this->cron_hook_identifier ) ) {
			wp_schedule_event( time() + 10, $this->cron_interval_identifier, $this->cron_hook_identifier );
		}
	}

	/**
	 * Is the updater running?
	 *
	 * @return boolean
	 */
	public function is_updating() {
		return false === $this->is_queue_empty();
	}

	/**
	 * Task
	 *
	 * Override this method to perform any actions required on each
	 * queue item. Return the modified item for further processing
	 * in the next pass through. Or, return false to remove the
	 * item from the queue.
	 *
	 * @param  string $callback Update callback function.
	 * @return mixed
	 */
	protected function task( $callback ) {
		rp_maybe_define_constant( 'RP_UPDATING', true );

		include_once( dirname( __FILE__ ) . '/rp-update-functions.php' );

		if ( is_callable( $callback ) ) {
			call_user_func( $callback );
		}

		return false;
	}

	/**
	 * Complete
	 *
	 * Override if applicable, but ensure that the below actions are
	 * performed, or, call parent::complete().
	 */
	protected function complete() {
		RP_Install::update_db_version();
		parent::complete();
	}
}