helpful.php

<?php
/**
 * Plugin Name: Helpful
 * Description: Add a fancy feedback form under your posts or post-types and ask your visitors a question. Give them the abbility to vote with yes or no.
 * Version: 4.5.26
 * Author: Pixelbart
 * Author URI: https://pixelbart.de
 * Text Domain: helpful
 * License: MIT License
 * License URI: https://opensource.org/licenses/MIT
 */

/* Prevent direct access */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

define( 'HELPFUL_FILE', __FILE__ );
define( 'HELPFUL_PATH', plugin_dir_path( __FILE__ ) );
define( 'HELPFUL_PHP_MIN', '5.6.20' );
define( 'HELPFUL_BASENAME', plugin_basename( __FILE__ ) );

/* Load Helpful after plugins are loaded */
add_action( 'plugins_loaded', array( 'HelpfulPlugin', 'get_instance' ) );

if ( ! class_exists( 'HelpfulPlugin' ) ) {

	class HelpfulPlugin	{
		/**
		 * Class Prefix.
		 *
		 * @var string
		 */
		private $prefix = 'Helpful\\';

		/**
		 * Saves an instance of the class.
		 *
		 * @var HelpfulPlugin
		 */
		private static $instance;

		/**
		 * Creates an instance of the class if it does not yet exist.
		 *
		 * @return HelpfulPlugin
		 */
		public static function get_instance() {
			if ( ! isset( self::$instance ) ) {
				self::$instance = new self();
			}

			return self::$instance;
		}

		/**
		 * Class constructor.
		 *
		 * @return void
		 */
		private function __construct() {
			/* Starts the autoloader. */
			spl_autoload_register( array( $this, 'autoload' ) );

			/* Initializes the classes and functions. */
			$this->init();

			add_action( 'admin_init', array( & $this, 'shedule_cron_events' ) );

			register_deactivation_hook( HELPFUL_FILE, array( & $this, 'unshedule_cron_events' ) );
		}

		/**
		 * Outputs the current Helpful version, which is stored in the plugin file as a comment.
		 *
		 * @return string
		 */
		public function get_plugin_version() {
			$plugin_data = get_plugin_data( HELPFUL_FILE );
			return ( isset( $plugin_data['Version'] ) ) ? $plugin_data['Version'] : '1.0.0';
		}

		/**
		 * Outputs the Helpful version that was stored in the database.
		 *
		 * @version 4.4.59
		 *
		 * @return string
		 */
		public function get_option_version() {
			return esc_attr( get_option( 'helpful/version', '1.0.0' ) );
		}

		/**
		 * @return void
		 */
		public function refresh_option_version() {
			do_action( 'helpful/version/refresh', $this->get_plugin_version(), $this->get_option_version() );
			update_option( 'helpful/version', $this->get_plugin_version() );
		}

		/**
		 * Includes all classes.
		 *
		 * @param string $class_name class name.
		 *
		 * @return void
		 */
		public function autoload( $class_name ) {
			$prefix = $this->prefix;

			$len = strlen( $prefix );

			if ( 0 !== strncmp( $prefix, $class_name, $len ) ) {
				return;
			}

			$relative_class = substr( $class_name, $len );

			$path = explode( '\\', strtolower( str_replace( '_', '-', $relative_class ) ) );
			$file = array_pop( $path );
			$file = HELPFUL_PATH . implode( '/', $path ) . '/class-' . $file . '.php';

			/* Includes the file if the file exists. */
			if ( file_exists( $file ) ) {
				require $file;
			}
		}

		/**
		 * Initializes the classes.
		 *
		 * @return void
		 */
		public function init() {
			include_once HELPFUL_PATH . 'core/functions/helpers.php';

			$this->class_exists( 'Helpful\Core\Modules\Core' );

			$this->class_exists( 'Helpful\Core\Solutions\WP_Rocket' );
			$this->class_exists( 'Helpful\Core\Solutions\WPML' );

			$this->class_exists( 'Helpful\Core\Modules\Maintenance' );
			$this->class_exists( 'Helpful\Core\Modules\debug' );
			$this->class_exists( 'Helpful\Core\Modules\Admin' );

			$this->class_exists( 'Helpful\Core\Modules\Feedback_Admin' );
			$this->class_exists( 'Helpful\Core\Modules\Widget' );

			$this->class_exists( 'Helpful\Core\Customizer\Core' );

			$this->class_exists( 'Helpful\Core\Modules\Frontend' );
			$this->class_exists( 'Helpful\Core\Modules\Api' );

			$this->class_exists( 'Helpful\Core\Tabs\Start' );
			$this->class_exists( 'Helpful\Core\Tabs\Details' );
			$this->class_exists( 'Helpful\Core\Tabs\Texts' );
			$this->class_exists( 'Helpful\Core\Tabs\Feedback' );
			$this->class_exists( 'Helpful\Core\Tabs\Design' );
			$this->class_exists( 'Helpful\Core\Tabs\System' );
			$this->class_exists( 'Helpful\Core\Tabs\Export' );
			$this->class_exists( 'Helpful\Core\Tabs\Log' );

			if ( is_admin() ) {
				add_action( 'load-post.php', array( 'Helpful\Core\Modules\Metabox', 'get_instance' ) );
				add_action( 'load-post-new.php', array( 'Helpful\Core\Modules\Metabox', 'get_instance' ) );
			}

			include_once HELPFUL_PATH . 'core/functions/values.php';
		}

		/**
		 * Checks if a class exists and then sets an instance.
		 *
		 * @param string $class_name class name.
		 *
		 * @return string
		 */
		public function class_exists( $class_name ) {
			if ( class_exists( $class_name ) ) {
				$class_name::get_instance();
			}

			return $class_name;
		}

		/**
		 * Unshedules the events created by Helpful for the crons.
		 *
		 * @return void
		 */
		public function unshedule_cron_events() {
			wp_unschedule_event( wp_next_scheduled( 'helpful/dashboard/build_cache' ), 'helpful/dashboard/build_cache' );
		}

		/**
		 * Shedules the events created by Helpful for the crons. Updates the version in the database,
		 * with the current version, if the versions do not match.
		 *
		 * @return void
		 */
		public function shedule_cron_events() {
			$plugin_version = $this->get_plugin_version();
			$option_version = $this->get_option_version();

			if ( $plugin_version !== $option_version ) {
				/* dashboard cron */
				if ( ! wp_next_scheduled( 'helpful/dashboard/build_cache' ) ) {
					wp_schedule_event( time(), 'twicedaily', 'helpful/dashboard/build_cache' );
				}

				/* refresh version in database */
				$this->refresh_option_version();
			}
		}
	}
}