woocommerce/woocommerce

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includes/class-wc-query.php

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<?php
/**
 * Contains the query functions for WooCommerce which alter the front-end post queries and loops
 *
 * @version 3.2.0
 * @package WooCommerce\Classes
 */

defined( 'ABSPATH' ) || exit;

/**
 * WC_Query Class.
 */
class WC_Query {

    /**
     * Query vars to add to wp.
     *
     * @var array
     */
    public $query_vars = array();

    /**
     * Reference to the main product query on the page.
     *
     * @var WP_Query
     */
    private static $product_query;

    /**
     * Stores chosen attributes.
     *
     * @var array
     */
    private static $chosen_attributes;

    /**
     * Constructor for the query class. Hooks in methods.
     */
    public function __construct() {
        add_action( 'init', array( $this, 'add_endpoints' ) );
        if ( ! is_admin() ) {
            add_action( 'wp_loaded', array( $this, 'get_errors' ), 20 );
            add_filter( 'query_vars', array( $this, 'add_query_vars' ), 0 );
            add_action( 'parse_request', array( $this, 'parse_request' ), 0 );
            add_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) );
            add_filter( 'get_pagenum_link', array( $this, 'remove_add_to_cart_pagination' ), 10, 1 );
        }
        $this->init_query_vars();
    }

    /**
     * Get any errors from querystring.
     */
    public function get_errors() {
        // phpcs:ignore WordPress.Security.NonceVerification.Recommended
        $error = ! empty( $_GET['wc_error'] ) ? sanitize_text_field( wp_unslash( $_GET['wc_error'] ) ) : '';

        if ( $error && ! wc_has_notice( $error, 'error' ) ) {
            wc_add_notice( $error, 'error' );
        }
    }

    /**
     * Init query vars by loading options.
     */
    public function init_query_vars() {
        // Query vars to add to WP.
        $this->query_vars = array(
            // Checkout actions.
            'order-pay'                  => get_option( 'woocommerce_checkout_pay_endpoint', 'order-pay' ),
            'order-received'             => get_option( 'woocommerce_checkout_order_received_endpoint', 'order-received' ),
            // My account actions.
            'orders'                     => get_option( 'woocommerce_myaccount_orders_endpoint', 'orders' ),
            'view-order'                 => get_option( 'woocommerce_myaccount_view_order_endpoint', 'view-order' ),
            'downloads'                  => get_option( 'woocommerce_myaccount_downloads_endpoint', 'downloads' ),
            'edit-account'               => get_option( 'woocommerce_myaccount_edit_account_endpoint', 'edit-account' ),
            'edit-address'               => get_option( 'woocommerce_myaccount_edit_address_endpoint', 'edit-address' ),
            'payment-methods'            => get_option( 'woocommerce_myaccount_payment_methods_endpoint', 'payment-methods' ),
            'lost-password'              => get_option( 'woocommerce_myaccount_lost_password_endpoint', 'lost-password' ),
            'customer-logout'            => get_option( 'woocommerce_logout_endpoint', 'customer-logout' ),
            'add-payment-method'         => get_option( 'woocommerce_myaccount_add_payment_method_endpoint', 'add-payment-method' ),
            'delete-payment-method'      => get_option( 'woocommerce_myaccount_delete_payment_method_endpoint', 'delete-payment-method' ),
            'set-default-payment-method' => get_option( 'woocommerce_myaccount_set_default_payment_method_endpoint', 'set-default-payment-method' ),
        );
    }

    /**
     * Get page title for an endpoint.
     *
     * @param string $endpoint Endpoint key.
     * @param string $action Optional action or variation within the endpoint.
     *
     * @since 2.3.0
     * @since 4.6.0 Added $action parameter.
     * @return string The page title.
     */
    public function get_endpoint_title( $endpoint, $action = '' ) {
        global $wp;

        switch ( $endpoint ) {
            case 'order-pay':
                $title = __( 'Pay for order', 'woocommerce' );
                break;
            case 'order-received':
                $title = __( 'Order received', 'woocommerce' );
                break;
            case 'orders':
                if ( ! empty( $wp->query_vars['orders'] ) ) {
                    /* translators: %s: page */
                    $title = sprintf( __( 'Orders (page %d)', 'woocommerce' ), intval( $wp->query_vars['orders'] ) );
                } else {
                    $title = __( 'Orders', 'woocommerce' );
                }
                break;
            case 'view-order':
                $order = wc_get_order( $wp->query_vars['view-order'] );
                /* translators: %s: order number */
                $title = ( $order ) ? sprintf( __( 'Order #%s', 'woocommerce' ), $order->get_order_number() ) : '';
                break;
            case 'downloads':
                $title = __( 'Downloads', 'woocommerce' );
                break;
            case 'edit-account':
                $title = __( 'Account details', 'woocommerce' );
                break;
            case 'edit-address':
                $title = __( 'Addresses', 'woocommerce' );
                break;
            case 'payment-methods':
                $title = __( 'Payment methods', 'woocommerce' );
                break;
            case 'add-payment-method':
                $title = __( 'Add payment method', 'woocommerce' );
                break;
            case 'lost-password':
                if ( in_array( $action, array( 'rp', 'resetpass', 'newaccount' ) ) ) {
                    $title = __( 'Set password', 'woocommerce' );
                } else {
                    $title = __( 'Lost password', 'woocommerce' );
                }
                break;
            default:
                $title = '';
                break;
        }

        /**
         * Filters the page title used for my-account endpoints.
         *
         * @since 2.6.0
         * @since 4.6.0 Added $action parameter.
         *
         * @see get_endpoint_title()
         *
         * @param string $title Default title.
         * @param string $endpoint Endpoint key.
         * @param string $action Optional action or variation within the endpoint.
         */
        return apply_filters( 'woocommerce_endpoint_' . $endpoint . '_title', $title, $endpoint, $action );
    }

    /**
     * Endpoint mask describing the places the endpoint should be added.
     *
     * @since 2.6.2
     * @return int
     */
    public function get_endpoints_mask() {
        if ( 'page' === get_option( 'show_on_front' ) ) {
            $page_on_front     = get_option( 'page_on_front' );
            $myaccount_page_id = get_option( 'woocommerce_myaccount_page_id' );
            $checkout_page_id  = get_option( 'woocommerce_checkout_page_id' );

            if ( in_array( $page_on_front, array( $myaccount_page_id, $checkout_page_id ), true ) ) {
                return EP_ROOT | EP_PAGES;
            }
        }

        return EP_PAGES;
    }

    /**
     * Add endpoints for query vars.
     */
    public function add_endpoints() {
        $mask = $this->get_endpoints_mask();

        foreach ( $this->get_query_vars() as $key => $var ) {
            if ( ! empty( $var ) ) {
                add_rewrite_endpoint( $var, $mask );
            }
        }
    }

    /**
     * Add query vars.
     *
     * @param array $vars Query vars.
     * @return array
     */
    public function add_query_vars( $vars ) {
        foreach ( $this->get_query_vars() as $key => $var ) {
            $vars[] = $key;
        }
        return $vars;
    }

    /**
     * Get query vars.
     *
     * @return array
     */
    public function get_query_vars() {
        return apply_filters( 'woocommerce_get_query_vars', $this->query_vars );
    }

    /**
     * Get query current active query var.
     *
     * @return string
     */
    public function get_current_endpoint() {
        global $wp;

        foreach ( $this->get_query_vars() as $key => $value ) {
            if ( isset( $wp->query_vars[ $key ] ) ) {
                return $key;
            }
        }
        return '';
    }

    /**
     * Parse the request and look for query vars - endpoints may not be supported.
     */
    public function parse_request() {
        global $wp;

        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        // Map query vars to their keys, or get them if endpoints are not supported.
        foreach ( $this->get_query_vars() as $key => $var ) {
            if ( isset( $_GET[ $var ] ) ) {
                $wp->query_vars[ $key ] = sanitize_text_field( wp_unslash( $_GET[ $var ] ) );
            } elseif ( isset( $wp->query_vars[ $var ] ) ) {
                $wp->query_vars[ $key ] = $wp->query_vars[ $var ];
            }
        }
        // phpcs:enable WordPress.Security.NonceVerification.Recommended
    }

    /**
     * Are we currently on the front page?
     *
     * @param WP_Query $q Query instance.
     * @return bool
     */
    private function is_showing_page_on_front( $q ) {
        return ( $q->is_home() && ! $q->is_posts_page ) && 'page' === get_option( 'show_on_front' );
    }

    /**
     * Is the front page a page we define?
     *
     * @param int $page_id Page ID.
     * @return bool
     */
    private function page_on_front_is( $page_id ) {
        return absint( get_option( 'page_on_front' ) ) === absint( $page_id );
    }

    /**
     * Hook into pre_get_posts to do the main product query.
     *
     * @param WP_Query $q Query instance.
     */
    public function pre_get_posts( $q ) {
        // We only want to affect the main query.
        if ( ! $q->is_main_query() ) {
            return;
        }

        // Fixes for queries on static homepages.
        if ( $this->is_showing_page_on_front( $q ) ) {

            // Fix for endpoints on the homepage.
            if ( ! $this->page_on_front_is( $q->get( 'page_id' ) ) ) {
                $_query = wp_parse_args( $q->query );
                if ( ! empty( $_query ) && array_intersect( array_keys( $_query ), array_keys( $this->get_query_vars() ) ) ) {
                    $q->is_page     = true;
                    $q->is_home     = false;
                    $q->is_singular = true;
                    $q->set( 'page_id', (int) get_option( 'page_on_front' ) );
                    add_filter( 'redirect_canonical', '__return_false' );
                }
            }

            // When orderby is set, WordPress shows posts on the front-page. Get around that here.
            if ( $this->page_on_front_is( wc_get_page_id( 'shop' ) ) ) {
                $_query = wp_parse_args( $q->query );
                if ( empty( $_query ) || ! array_diff( array_keys( $_query ), array( 'preview', 'page', 'paged', 'cpage', 'orderby' ) ) ) {
                    $q->set( 'page_id', (int) get_option( 'page_on_front' ) );
                    $q->is_page = true;
                    $q->is_home = false;

                    // WP supporting themes show post type archive.
                    if ( current_theme_supports( 'woocommerce' ) ) {
                        $q->set( 'post_type', 'product' );
                    } else {
                        $q->is_singular = true;
                    }
                }
            } elseif ( ! empty( $_GET['orderby'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended
                $q->set( 'page_id', (int) get_option( 'page_on_front' ) );
                $q->is_page     = true;
                $q->is_home     = false;
                $q->is_singular = true;
            }
        }

        // Fix product feeds.
        if ( $q->is_feed() && $q->is_post_type_archive( 'product' ) ) {
            $q->is_comment_feed = false;
        }

        // Special check for shops with the PRODUCT POST TYPE ARCHIVE on front.
        if ( current_theme_supports( 'woocommerce' ) && $q->is_page() && 'page' === get_option( 'show_on_front' ) && absint( $q->get( 'page_id' ) ) === wc_get_page_id( 'shop' ) ) {
            // This is a front-page shop.
            $q->set( 'post_type', 'product' );
            $q->set( 'page_id', '' );

            if ( isset( $q->query['paged'] ) ) {
                $q->set( 'paged', $q->query['paged'] );
            }

            // Define a variable so we know this is the front page shop later on.
            wc_maybe_define_constant( 'SHOP_IS_ON_FRONT', true );

            // Get the actual WP page to avoid errors and let us use is_front_page().
            // This is hacky but works. Awaiting https://core.trac.wordpress.org/ticket/21096.
            global $wp_post_types;

            $shop_page = get_post( wc_get_page_id( 'shop' ) );

            $wp_post_types['product']->ID         = $shop_page->ID;
            $wp_post_types['product']->post_title = $shop_page->post_title;
            $wp_post_types['product']->post_name  = $shop_page->post_name;
            $wp_post_types['product']->post_type  = $shop_page->post_type;
            $wp_post_types['product']->ancestors  = get_ancestors( $shop_page->ID, $shop_page->post_type );

            // Fix conditional Functions like is_front_page.
            $q->is_singular          = false;
            $q->is_post_type_archive = true;
            $q->is_archive           = true;
            $q->is_page              = true;

            // Remove post type archive name from front page title tag.
            add_filter( 'post_type_archive_title', '__return_empty_string', 5 );

            // Fix WP SEO.
            if ( class_exists( 'WPSEO_Meta' ) ) {
                add_filter( 'wpseo_metadesc', array( $this, 'wpseo_metadesc' ) );
                add_filter( 'wpseo_metakey', array( $this, 'wpseo_metakey' ) );
            }
        } elseif ( ! $q->is_post_type_archive( 'product' ) && ! $q->is_tax( get_object_taxonomies( 'product' ) ) ) {
            // Only apply to product categories, the product post archive, the shop page, product tags, and product attribute taxonomies.
            return;
        }

        $this->product_query( $q );
    }

    /**
     * Handler for the 'the_posts' WP filter.
     *
     * @param array    $posts Posts from WP Query.
     * @param WP_Query $query Current query.
     *
     * @return array
     */
    public function handle_get_posts( $posts, $query ) {
        if ( 'product_query' !== $query->get( 'wc_query' ) ) {
            return $posts;
        }
        $this->remove_product_query_filters( $posts );
        return $posts;
    }


    /**
     * Pre_get_posts above may adjust the main query to add WooCommerce logic. When this query is done, we need to ensure
     * all custom filters are removed.
     *
     * This is done here during the_posts filter. The input is not changed.
     *
     * @param array $posts Posts from WP Query.
     * @return array
     */
    public function remove_product_query_filters( $posts ) {
        $this->remove_ordering_args();
        remove_filter( 'posts_clauses', array( $this, 'price_filter_post_clauses' ), 10, 2 );
        return $posts;
    }

    /**
     * This function used to be hooked to found_posts and adjust the posts count when the filtering by attribute
     * widget was used and variable products were present. Now it isn't hooked anymore and does nothing but return
     * the input unchanged, since the pull request in which it was introduced has been reverted.
     *
     * @since 4.4.0
     * @param int      $count Original posts count, as supplied by the found_posts filter.
     * @param WP_Query $query The current WP_Query object.
     *
     * @return int Adjusted posts count.
     */
    public function adjust_posts_count( $count, $query ) {
        return $count;
    }

    /**
     * Instance version of get_layered_nav_chosen_attributes, needed for unit tests.
     *
     * @return array
     */
    protected function get_layered_nav_chosen_attributes_inst() {
        return self::get_layered_nav_chosen_attributes();
    }

    /**
     * Get the posts (or the ids of the posts) found in the current WP loop.
     *
     * @return array Array of posts or post ids.
     */
    protected function get_current_posts() {
        return $GLOBALS['wp_query']->posts;
    }

    /**
     * WP SEO meta description.
     *
     * Hooked into wpseo_ hook already, so no need for function_exist.
     *
     * @return string
     */
    public function wpseo_metadesc() {
        return WPSEO_Meta::get_value( 'metadesc', wc_get_page_id( 'shop' ) );
    }

    /**
     * WP SEO meta key.
     *
     * Hooked into wpseo_ hook already, so no need for function_exist.
     *
     * @return string
     */
    public function wpseo_metakey() {
        return WPSEO_Meta::get_value( 'metakey', wc_get_page_id( 'shop' ) );
    }

    /**
     * Query the products, applying sorting/ordering etc.
     * This applies to the main WordPress loop.
     *
     * @param WP_Query $q Query instance.
     */
    public function product_query( $q ) {
        if ( ! is_feed() ) {
            $ordering = $this->get_catalog_ordering_args();
            $q->set( 'orderby', $ordering['orderby'] );
            $q->set( 'order', $ordering['order'] );

            if ( isset( $ordering['meta_key'] ) ) {
                $q->set( 'meta_key', $ordering['meta_key'] );
            }
        }

        // Query vars that affect posts shown.
        $q->set( 'meta_query', $this->get_meta_query( $q->get( 'meta_query' ), true ) );
        $q->set( 'tax_query', $this->get_tax_query( $q->get( 'tax_query' ), true ) );
        $q->set( 'wc_query', 'product_query' );
        $q->set( 'post__in', array_unique( (array) apply_filters( 'loop_shop_post_in', array() ) ) );

        // Work out how many products to query.
        $q->set( 'posts_per_page', $q->get( 'posts_per_page' ) ? $q->get( 'posts_per_page' ) : apply_filters( 'loop_shop_per_page', wc_get_default_products_per_row() * wc_get_default_product_rows_per_page() ) );

        // Store reference to this query.
        self::$product_query = $q;

        // Additonal hooks to change WP Query.
        add_filter( 'posts_clauses', array( $this, 'price_filter_post_clauses' ), 10, 2 );
        add_filter( 'the_posts', array( $this, 'handle_get_posts' ), 10, 2 );

        do_action( 'woocommerce_product_query', $q, $this );
    }

    /**
     * Remove the query.
     */
    public function remove_product_query() {
        remove_action( 'pre_get_posts', array( $this, 'pre_get_posts' ) );
    }

    /**
     * Remove ordering queries.
     */
    public function remove_ordering_args() {
        remove_filter( 'posts_clauses', array( $this, 'order_by_price_asc_post_clauses' ) );
        remove_filter( 'posts_clauses', array( $this, 'order_by_price_desc_post_clauses' ) );
        remove_filter( 'posts_clauses', array( $this, 'order_by_popularity_post_clauses' ) );
        remove_filter( 'posts_clauses', array( $this, 'order_by_rating_post_clauses' ) );
    }

    /**
     * Returns an array of arguments for ordering products based on the selected values.
     *
     * @param string $orderby Order by param.
     * @param string $order Order param.
     * @return array
     */
    public function get_catalog_ordering_args( $orderby = '', $order = '' ) {
        // Get ordering from query string unless defined.
        if ( ! $orderby ) {
            // phpcs:ignore WordPress.Security.NonceVerification.Recommended
            $orderby_value = isset( $_GET['orderby'] ) ? wc_clean( (string) wp_unslash( $_GET['orderby'] ) ) : wc_clean( get_query_var( 'orderby' ) );

            if ( ! $orderby_value ) {
                if ( is_search() ) {
                    $orderby_value = 'relevance';
                } else {
                    $orderby_value = apply_filters( 'woocommerce_default_catalog_orderby', get_option( 'woocommerce_default_catalog_orderby', 'menu_order' ) );
                }
            }

            // Get order + orderby args from string.
            $orderby_value = is_array( $orderby_value ) ? $orderby_value : explode( '-', $orderby_value );
            $orderby       = esc_attr( $orderby_value[0] );
            $order         = ! empty( $orderby_value[1] ) ? $orderby_value[1] : $order;
        }

        // Convert to correct format.
        $orderby = strtolower( is_array( $orderby ) ? (string) current( $orderby ) : (string) $orderby );
        $order   = strtoupper( is_array( $order ) ? (string) current( $order ) : (string) $order );
        $args    = array(
            'orderby'  => $orderby,
            'order'    => ( 'DESC' === $order ) ? 'DESC' : 'ASC',
            'meta_key' => '', // @codingStandardsIgnoreLine
        );

        switch ( $orderby ) {
            case 'id':
                $args['orderby'] = 'ID';
                break;
            case 'menu_order':
                $args['orderby'] = 'menu_order title';
                break;
            case 'title':
                $args['orderby'] = 'title';
                $args['order']   = ( 'DESC' === $order ) ? 'DESC' : 'ASC';
                break;
            case 'relevance':
                $args['orderby'] = 'relevance';
                $args['order']   = 'DESC';
                break;
            case 'rand':
                $args['orderby'] = 'rand'; // @codingStandardsIgnoreLine
                break;
            case 'date':
                $args['orderby'] = 'date ID';
                $args['order']   = ( 'ASC' === $order ) ? 'ASC' : 'DESC';
                break;
            case 'price':
                $callback = 'DESC' === $order ? 'order_by_price_desc_post_clauses' : 'order_by_price_asc_post_clauses';
                add_filter( 'posts_clauses', array( $this, $callback ) );
                break;
            case 'popularity':
                add_filter( 'posts_clauses', array( $this, 'order_by_popularity_post_clauses' ) );
                break;
            case 'rating':
                add_filter( 'posts_clauses', array( $this, 'order_by_rating_post_clauses' ) );
                break;
        }

        return apply_filters( 'woocommerce_get_catalog_ordering_args', $args, $orderby, $order );
    }

    /**
     * Custom query used to filter products by price.
     *
     * @since 3.6.0
     *
     * @param array    $args Query args.
     * @param WP_Query $wp_query WP_Query object.
     *
     * @return array
     */
    public function price_filter_post_clauses( $args, $wp_query ) {
        global $wpdb;

        // phpcs:ignore WordPress.Security.NonceVerification.Recommended
        if ( ! $wp_query->is_main_query() || ( ! isset( $_GET['max_price'] ) && ! isset( $_GET['min_price'] ) ) ) {
            return $args;
        }

        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        $current_min_price = isset( $_GET['min_price'] ) ? floatval( wp_unslash( $_GET['min_price'] ) ) : 0;
        $current_max_price = isset( $_GET['max_price'] ) ? floatval( wp_unslash( $_GET['max_price'] ) ) : PHP_INT_MAX;
        // phpcs:enable WordPress.Security.NonceVerification.Recommended

        /**
         * Adjust if the store taxes are not displayed how they are stored.
         * Kicks in when prices excluding tax are displayed including tax.
         */
        if ( wc_tax_enabled() && 'incl' === get_option( 'woocommerce_tax_display_shop' ) && ! wc_prices_include_tax() ) {
            $tax_class = apply_filters( 'woocommerce_price_filter_widget_tax_class', '' ); // Uses standard tax class.
            $tax_rates = WC_Tax::get_rates( $tax_class );

            if ( $tax_rates ) {
                $current_min_price -= WC_Tax::get_tax_total( WC_Tax::calc_inclusive_tax( $current_min_price, $tax_rates ) );
                $current_max_price -= WC_Tax::get_tax_total( WC_Tax::calc_inclusive_tax( $current_max_price, $tax_rates ) );
            }
        }

        $args['join']   = $this->append_product_sorting_table_join( $args['join'] );
        $args['where'] .= $wpdb->prepare(
            ' AND NOT (%f<wc_product_meta_lookup.min_price OR %f>wc_product_meta_lookup.max_price ) ',
            $current_max_price,
            $current_min_price
        );
        return $args;
    }

    /**
     * Handle numeric price sorting.
     *
     * @param array $args Query args.
     * @return array
     */
    public function order_by_price_asc_post_clauses( $args ) {
        $args['join']    = $this->append_product_sorting_table_join( $args['join'] );
        $args['orderby'] = ' wc_product_meta_lookup.min_price ASC, wc_product_meta_lookup.product_id ASC ';
        return $args;
    }

    /**
     * Handle numeric price sorting.
     *
     * @param array $args Query args.
     * @return array
     */
    public function order_by_price_desc_post_clauses( $args ) {
        $args['join']    = $this->append_product_sorting_table_join( $args['join'] );
        $args['orderby'] = ' wc_product_meta_lookup.max_price DESC, wc_product_meta_lookup.product_id DESC ';
        return $args;
    }

    /**
     * WP Core does not let us change the sort direction for individual orderby params - https://core.trac.wordpress.org/ticket/17065.
     *
     * This lets us sort by meta value desc, and have a second orderby param.
     *
     * @param array $args Query args.
     * @return array
     */
    public function order_by_popularity_post_clauses( $args ) {
        $args['join']    = $this->append_product_sorting_table_join( $args['join'] );
        $args['orderby'] = ' wc_product_meta_lookup.total_sales DESC, wc_product_meta_lookup.product_id DESC ';
        return $args;
    }

    /**
     * Order by rating post clauses.
     *
     * @param array $args Query args.
     * @return array
     */
    public function order_by_rating_post_clauses( $args ) {
        $args['join']    = $this->append_product_sorting_table_join( $args['join'] );
        $args['orderby'] = ' wc_product_meta_lookup.average_rating DESC, wc_product_meta_lookup.rating_count DESC, wc_product_meta_lookup.product_id DESC ';
        return $args;
    }

    /**
     * Join wc_product_meta_lookup to posts if not already joined.
     *
     * @param string $sql SQL join.
     * @return string
     */
    private function append_product_sorting_table_join( $sql ) {
        global $wpdb;

        if ( ! strstr( $sql, 'wc_product_meta_lookup' ) ) {
            $sql .= " LEFT JOIN {$wpdb->wc_product_meta_lookup} wc_product_meta_lookup ON $wpdb->posts.ID = wc_product_meta_lookup.product_id ";
        }
        return $sql;
    }

    /**
     * Appends meta queries to an array.
     *
     * @param  array $meta_query Meta query.
     * @param  bool  $main_query If is main query.
     * @return array
     */
    public function get_meta_query( $meta_query = array(), $main_query = false ) {
        if ( ! is_array( $meta_query ) ) {
            $meta_query = array();
        }
        return array_filter( apply_filters( 'woocommerce_product_query_meta_query', $meta_query, $this ) );
    }

    /**
     * Appends tax queries to an array.
     *
     * @param  array $tax_query  Tax query.
     * @param  bool  $main_query If is main query.
     * @return array
     */
    public function get_tax_query( $tax_query = array(), $main_query = false ) {
        if ( ! is_array( $tax_query ) ) {
            $tax_query = array(
                'relation' => 'AND',
            );
        }

        // Layered nav filters on terms.
        if ( $main_query ) {
            foreach ( $this->get_layered_nav_chosen_attributes() as $taxonomy => $data ) {
                $tax_query[] = array(
                    'taxonomy'         => $taxonomy,
                    'field'            => 'slug',
                    'terms'            => $data['terms'],
                    'operator'         => 'and' === $data['query_type'] ? 'AND' : 'IN',
                    'include_children' => false,
                );
            }
        }

        $product_visibility_terms  = wc_get_product_visibility_term_ids();
        $product_visibility_not_in = array( is_search() && $main_query ? $product_visibility_terms['exclude-from-search'] : $product_visibility_terms['exclude-from-catalog'] );

        // Hide out of stock products.
        if ( 'yes' === get_option( 'woocommerce_hide_out_of_stock_items' ) ) {
            $product_visibility_not_in[] = $product_visibility_terms['outofstock'];
        }

        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        // Filter by rating.
        if ( isset( $_GET['rating_filter'] ) ) {
            // phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized
            $rating_filter = array_filter( array_map( 'absint', explode( ',', wp_unslash( $_GET['rating_filter'] ) ) ) );
            $rating_terms  = array();
            for ( $i = 1; $i <= 5; $i ++ ) {
                if ( in_array( $i, $rating_filter, true ) && isset( $product_visibility_terms[ 'rated-' . $i ] ) ) {
                    $rating_terms[] = $product_visibility_terms[ 'rated-' . $i ];
                }
            }
            if ( ! empty( $rating_terms ) ) {
                $tax_query[] = array(
                    'taxonomy'      => 'product_visibility',
                    'field'         => 'term_taxonomy_id',
                    'terms'         => $rating_terms,
                    'operator'      => 'IN',
                    'rating_filter' => true,
                );
            }
        }
        // phpcs:enable WordPress.Security.NonceVerification.Recommended

        if ( ! empty( $product_visibility_not_in ) ) {
            $tax_query[] = array(
                'taxonomy' => 'product_visibility',
                'field'    => 'term_taxonomy_id',
                'terms'    => $product_visibility_not_in,
                'operator' => 'NOT IN',
            );
        }

        return array_filter( apply_filters( 'woocommerce_product_query_tax_query', $tax_query, $this ) );
    }

    /**
     * Get the main query which product queries ran against.
     *
     * @return WP_Query
     */
    public static function get_main_query() {
        return self::$product_query;
    }

    /**
     * Get the tax query which was used by the main query.
     *
     * @return array
     */
    public static function get_main_tax_query() {
        $tax_query = isset( self::$product_query->tax_query, self::$product_query->tax_query->queries ) ? self::$product_query->tax_query->queries : array();

        return $tax_query;
    }

    /**
     * Get the meta query which was used by the main query.
     *
     * @return array
     */
    public static function get_main_meta_query() {
        $args       = self::$product_query->query_vars;
        $meta_query = isset( $args['meta_query'] ) ? $args['meta_query'] : array();

        return $meta_query;
    }

    /**
     * Based on WP_Query::parse_search
     */
    public static function get_main_search_query_sql() {
        global $wpdb;

        $args         = self::$product_query->query_vars;
        $search_terms = isset( $args['search_terms'] ) ? $args['search_terms'] : array();
        $sql          = array();

        foreach ( $search_terms as $term ) {
            // Terms prefixed with '-' should be excluded.
            $include = '-' !== substr( $term, 0, 1 );

            if ( $include ) {
                $like_op  = 'LIKE';
                $andor_op = 'OR';
            } else {
                $like_op  = 'NOT LIKE';
                $andor_op = 'AND';
                $term     = substr( $term, 1 );
            }

            $like = '%' . $wpdb->esc_like( $term ) . '%';
            // phpcs:ignore WordPress.DB.PreparedSQL.InterpolatedNotPrepared
            $sql[] = $wpdb->prepare( "(($wpdb->posts.post_title $like_op %s) $andor_op ($wpdb->posts.post_excerpt $like_op %s) $andor_op ($wpdb->posts.post_content $like_op %s))", $like, $like, $like );
        }

        if ( ! empty( $sql ) && ! is_user_logged_in() ) {
            $sql[] = "($wpdb->posts.post_password = '')";
        }

        return implode( ' AND ', $sql );
    }

    /**
     * Get an array of attributes and terms selected with the layered nav widget.
     *
     * @return array
     */
    public static function get_layered_nav_chosen_attributes() {
        // phpcs:disable WordPress.Security.NonceVerification.Recommended
        if ( ! is_array( self::$chosen_attributes ) ) {
            self::$chosen_attributes = array();

            if ( ! empty( $_GET ) ) {
                foreach ( $_GET as $key => $value ) {
                    if ( 0 === strpos( $key, 'filter_' ) ) {
                        $attribute    = wc_sanitize_taxonomy_name( str_replace( 'filter_', '', $key ) );
                        $taxonomy     = wc_attribute_taxonomy_name( $attribute );
                        $filter_terms = ! empty( $value ) ? explode( ',', wc_clean( wp_unslash( $value ) ) ) : array();

                        if ( empty( $filter_terms ) || ! taxonomy_exists( $taxonomy ) || ! wc_attribute_taxonomy_id_by_name( $attribute ) ) {
                            continue;
                        }

                        $query_type                                    = ! empty( $_GET[ 'query_type_' . $attribute ] ) && in_array( $_GET[ 'query_type_' . $attribute ], array( 'and', 'or' ), true ) ? wc_clean( wp_unslash( $_GET[ 'query_type_' . $attribute ] ) ) : '';
                        self::$chosen_attributes[ $taxonomy ]['terms'] = array_map( 'sanitize_title', $filter_terms ); // Ensures correct encoding.
                        self::$chosen_attributes[ $taxonomy ]['query_type'] = $query_type ? $query_type : apply_filters( 'woocommerce_layered_nav_default_query_type', 'and' );
                    }
                }
            }
        }
        return self::$chosen_attributes;
        // phpcs:disable WordPress.Security.NonceVerification.Recommended
    }

    /**
     * Remove the add-to-cart param from pagination urls.
     *
     * @param string $url URL.
     * @return string
     */
    public function remove_add_to_cart_pagination( $url ) {
        return remove_query_arg( 'add-to-cart', $url );
    }

    /**
     * Return a meta query for filtering by rating.
     *
     * @deprecated 3.0.0 Replaced with taxonomy.
     * @return array
     */
    public function rating_filter_meta_query() {
        return array();
    }

    /**
     * Returns a meta query to handle product visibility.
     *
     * @deprecated 3.0.0 Replaced with taxonomy.
     * @param string $compare (default: 'IN').
     * @return array
     */
    public function visibility_meta_query( $compare = 'IN' ) {
        return array();
    }

    /**
     * Returns a meta query to handle product stock status.
     *
     * @deprecated 3.0.0 Replaced with taxonomy.
     * @param string $status (default: 'instock').
     * @return array
     */
    public function stock_status_meta_query( $status = 'instock' ) {
        return array();
    }

    /**
     * Layered nav init.
     *
     * @deprecated 2.6.0
     */
    public function layered_nav_init() {
        wc_deprecated_function( 'layered_nav_init', '2.6' );
    }

    /**
     * Get an unpaginated list all product IDs (both filtered and unfiltered). Makes use of transients.
     *
     * @deprecated 2.6.0 due to performance concerns
     */
    public function get_products_in_view() {
        wc_deprecated_function( 'get_products_in_view', '2.6' );
    }

    /**
     * Layered Nav post filter.
     *
     * @deprecated 2.6.0 due to performance concerns
     *
     * @param mixed $deprecated Deprecated.
     */
    public function layered_nav_query( $deprecated ) {
        wc_deprecated_function( 'layered_nav_query', '2.6' );
    }

    /**
     * Search post excerpt.
     *
     * @param string $where Where clause.
     *
     * @deprecated 3.2.0 - Not needed anymore since WordPress 4.5.
     */
    public function search_post_excerpt( $where = '' ) {
        wc_deprecated_function( 'WC_Query::search_post_excerpt', '3.2.0', 'Excerpt added to search query by default since WordPress 4.5.' );
        return $where;
    }

    /**
     * Remove the posts_where filter.
     *
     * @deprecated 3.2.0 - Nothing to remove anymore because search_post_excerpt() is deprecated.
     */
    public function remove_posts_where() {
        wc_deprecated_function( 'WC_Query::remove_posts_where', '3.2.0', 'Nothing to remove anymore because search_post_excerpt() is deprecated.' );
    }
}