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Filename : cache.php
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<?php
/**
 * Cache Class
 *
 */

defined( 'ABSPATH' ) || exit; // Exit if accessed directly


class JANNAH_OPTIMIZATION_CACHE{

	/**
	 * $cache_time
	 * transient exiration time
	 * @var int
	 */
	public $cache_time;
	public $cache_key;
	public $menu_transient   = 'main-nav';
	public $transient_prefix = 'tie-cache';


	/**
	 * __construct
	 *
	 * Class constructor where we will call our filter and action hooks.
	 */
	function __construct(){

		$this->cache_key  = apply_filters( 'TieLabs/cache_key', '' );
		$this->cache_time = 24 * HOUR_IN_SECONDS;

		// Reset Cache
		// mega menu cached by defaul so we need to fire all these actions
		add_action( 'wp_update_nav_menu',        array( $this, 'transient_flusher' ) );
		add_action( 'add_category',              array( $this, 'transient_flusher' ) );
		add_action( 'delete_category',           array( $this, 'transient_flusher' ) );
		add_action( 'edit_category',             array( $this, 'transient_flusher' ) );
		add_action( 'edit_terms',                array( $this, 'transient_flusher' ) );
		add_action( 'delete_term',               array( $this, 'transient_flusher' ) );
		add_action( 'delete_attachment',         array( $this, 'transient_flusher' ) );
		add_action( 'edit_attachment',           array( $this, 'transient_flusher' ) );
		add_action( 'trashed_post',              array( $this, 'transient_flusher' ) );
		add_action( 'untrashed_post',            array( $this, 'transient_flusher' ) );
		add_action( 'deleted_post',              array( $this, 'transient_flusher' ) );
		add_action( 'save_post',                 array( $this, 'transient_flusher' ) );
		add_action( 'switch_theme',              array( $this, 'transient_flusher' ) );
		add_action( 'upgrader_process_complete', array( $this, 'transient_flusher' ) );
		add_action( 'deleted_comment',           array( $this, 'transient_flusher' ) );
		add_action( 'untrashed_comment',         array( $this, 'transient_flusher' ) );
		add_action( 'spammed_comment',           array( $this, 'transient_flusher' ) );
		add_action( 'unspammed_comment',         array( $this, 'transient_flusher' ) );
		add_action( 'wp_set_comment_status',     array( $this, 'transient_flusher' ) );
		add_action( 'activated_plugin',          array( $this, 'transient_flusher' ) );
		add_action( 'deactivated_plugin',        array( $this, 'transient_flusher' ) );
		add_action( 'TieLabs/Options/updated',   array( $this, 'transient_flusher' ) );
		add_action( 'TieLabs/after_db_update',   array( $this, 'transient_flusher' ) );

		// Check if Cache option is enabled to cache main nav, widgets and breaking news
		if ( ! tie_get_option( 'jso_cache' ) /*|| ( defined( 'WP_CACHE' ) && WP_CACHE )*/ ){
			return;
		}

		// Get the Cached copy
		add_filter( 'widget_display_callback', array( $this, 'widget_display_callback' ), 10, 3 );
		add_filter( 'pre_wp_nav_menu',         array( $this, 'pre_wp_nav_menu' ),         10, 2 );

		// Update the Cache
		add_filter( 'wp_nav_menu',             array( $this, 'wp_nav_menu' ), 10, 2 );
		add_action( 'wp_footer',               array( $this, 'store_main_cache' ) );
	}


	/**
	 * store_main_cache
	 *
	 * Simple function to store the cache with one request
	 * Used for Breaking News and Widgets
	 *
	 */
	function store_main_cache(){

		// Don't Store Cache if this visit is mobile ---------
		if( tie_is_mobile() ){
			return;
		}

		if ( ! empty( $GLOBALS[ $this->cache_key ] ) ) {

			$new_data = $GLOBALS[ $this->cache_key ];
			if ( false !== ( $cached_data = get_transient( $this->cache_key ) ) ){
				$new_data = array_replace( $cached_data, $new_data );
			}

			$new_data = preg_replace( '/<!--(.|\s)*?-->/', '', $new_data );
			set_transient( $this->cache_key, $new_data, $this->cache_time );
		}
	}


	/**
	 * pre_wp_nav_menu
	 *
	 * Show the menu from cache
	 *
	 * @param  string|null $nav_menu    Nav menu output to short-circuit with.
	 * @param  object      $args        An object containing wp_nav_menu() arguments
	 * @return string|null
	 */
	function pre_wp_nav_menu( $nav_menu, $args ){

		if( $args->theme_location == 'primary' && ( is_home() || is_front_page() ) ) {
			if ( false !== ( $cached_data = get_transient( $this->cache_key .'-'. $this->menu_transient ) ) ) {
				return $cached_data;
			}
		}

		return $nav_menu;
	}


	/**
	 * wp_nav_menu
	 *
	 * Store menu in cache
	 *
	 * @param  string $nav      The HTML content for the navigation menu.
	 * @param  object $args     An object containing wp_nav_menu() arguments
	 * @return string           The HTML content for the navigation menu.
	 */
	function wp_nav_menu( $nav, $args ){

		if( $args->theme_location == 'primary' && ! tie_is_mobile() && ( is_home() || is_front_page() ) ) {
			set_transient( $this->cache_key .'-'. $this->menu_transient, $nav, $this->cache_time );
		}

		return $nav;
	}


	/**
	 * get_widget_key
	 *
	 * Simple function to generate a unique id for the widget transient
	 * based on the widget's instance and arguments
	 *
	 * @param  array $instance widget instance
	 * @param  array $args widget arguments
	 * @return string md5 hash
	 */
	function get_widget_key( $instance, $args ){
		return 'WC-' . md5( serialize( array( $instance, $args ) ) );
	}


	/**
	 * widget_display_callback
	 *
	 * @param array     $instance The current widget instance's settings.
	 * @param WP_Widget $widget     The current widget instance.
	 * @param array     $args     An array of default widget arguments.
	 * @return mixed array|boolean
	 */
	function widget_display_callback( $instance, $widget, $args ){

		if ( false === $instance ){
			return $instance;
		}

		// check if we need to cache this widget?
		$widgets = array(
			'categories',
			'tie-widget-categories',
			'nav_menu',
			'widget_tabs',
			'recent-posts',
			'recent-comments',
			'tie-slider-widget',
			'comments_avatar-widget',
			'posts-list-widget',
			'pages',
			'tag_cloud',
		);

		foreach ( $widgets as $widget_id ){
			if ( strpos( $args['widget_id'], $widget_id.'-' ) !== false ){
				$is_cache = true;

				// Don't cache random posts widget
				if( $widget_id == 'posts-list-widget-' && ( ! empty( $instance['posts_order'] ) && $instance['posts_order'] == 'rand' ) ) {
					$is_cache = false;
				}
			}
		}

		if( empty( $is_cache ) ) {
			return $instance;
		}


		// Create a uniqe transient ID for this widget instance
		$widget_id = $this->get_widget_key( $instance, $args );

		// Get the "cached version of the widget"
		if ( false !== ( $cached_data = get_transient( $this->cache_key ) ) ){
			if( isset( $cached_data[ $widget_id ] ) ) {
				$cached_widget = $cached_data[ $widget_id ];
			}
		}

		// It wasn't there, so render the widget and save it as a transient
		if( empty( $cached_widget ) ) {
			ob_start();
			$widget->widget( $args, $instance );
			$cached_widget = ob_get_clean();
			$GLOBALS[ $this->cache_key ][ $widget_id ] = $cached_widget;
		}

		// Output the widget
		echo ( $cached_widget );

		return false;
	}


	/**
	 * transient_flusher
	 *
	 * Reset the cache
	 */
	function transient_flusher(){

		global $wpdb;
		$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", '_transient_'. $this->transient_prefix .'%' ));
		$wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->options} WHERE option_name LIKE %s", '_transient_timeout_'. $this->transient_prefix .'%' ));

		// Removes all cache items.
		wp_cache_flush();
	}

}


//
add_filter( 'init', 'jannah_optimization_cache_init' );
function jannah_optimization_cache_init(){

	// This method available in v4.0.0 and above
	if( method_exists( 'TIELABS_HELPER','has_builder' ) ){
		new JANNAH_OPTIMIZATION_CACHE();
	}
}