woocommerce/includes/widgets/class-wc-widget-price-filter.php

<?php
/**
 * Price Filter Widget and related functions.
 *
 * Generates a range slider to filter products by price.
 *
 * @package WooCommerce\Widgets
 * @version 2.3.0
 */

use Automattic\Jetpack\Constants;

defined( 'ABSPATH' ) || exit;

/**
 * Widget price filter class.
 */
class WC_Widget_Price_Filter extends WC_Widget {

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->widget_cssclass    = 'woocommerce widget_price_filter';
		$this->widget_description = __( 'Display a slider to filter products in your store by price.', 'woocommerce' );
		$this->widget_id          = 'woocommerce_price_filter';
		$this->widget_name        = __( 'Filter Products by Price', 'woocommerce' );
		$this->settings           = array(
			'title' => array(
				'type'  => 'text',
				'std'   => __( 'Filter by price', 'woocommerce' ),
				'label' => __( 'Title', 'woocommerce' ),
			),
		);
		$suffix                   = Constants::is_true( 'SCRIPT_DEBUG' ) ? '' : '.min';
		$version                  = Constants::get_constant( 'WC_VERSION' );
		wp_register_script( 'accounting', WC()->plugin_url() . '/assets/js/accounting/accounting' . $suffix . '.js', array( 'jquery' ), '0.4.2', true );
		wp_register_script( 'wc-jquery-ui-touchpunch', WC()->plugin_url() . '/assets/js/jquery-ui-touch-punch/jquery-ui-touch-punch' . $suffix . '.js', array( 'jquery-ui-slider' ), $version, true );
		wp_register_script( 'wc-price-slider', WC()->plugin_url() . '/assets/js/frontend/price-slider' . $suffix . '.js', array( 'jquery-ui-slider', 'wc-jquery-ui-touchpunch', 'accounting' ), $version, true );
		wp_localize_script(
			'wc-price-slider',
			'woocommerce_price_slider_params',
			array(
				'currency_format_num_decimals' => 0,
				'currency_format_symbol'       => get_woocommerce_currency_symbol(),
				'currency_format_decimal_sep'  => esc_attr( wc_get_price_decimal_separator() ),
				'currency_format_thousand_sep' => esc_attr( wc_get_price_thousand_separator() ),
				'currency_format'              => esc_attr( str_replace( array( '%1$s', '%2$s' ), array( '%s', '%v' ), get_woocommerce_price_format() ) ),
			)
		);

		if ( is_customize_preview() ) {
			wp_enqueue_script( 'wc-price-slider' );
		}

		parent::__construct();
	}

	/**
	 * Output widget.
	 *
	 * @see WP_Widget
	 *
	 * @param array $args     Arguments.
	 * @param array $instance Widget instance.
	 */
	public function widget( $args, $instance ) {
		global $wp;

		// Requires lookup table added in 3.6.
		if ( version_compare( get_option( 'woocommerce_db_version', null ), '3.6', '<' ) ) {
			return;
		}

		if ( ! is_shop() && ! is_product_taxonomy() ) {
			return;
		}

		// If there are not posts and we're not filtering, hide the widget.
		if ( ! WC()->query->get_main_query()->post_count && ! isset( $_GET['min_price'] ) && ! isset( $_GET['max_price'] ) ) { // WPCS: input var ok, CSRF ok.
			return;
		}

		wp_enqueue_script( 'wc-price-slider' );

		// Round values to nearest 10 by default.
		$step = max( apply_filters( 'woocommerce_price_filter_widget_step', 10 ), 1 );

		// Find min and max price in current result set.
		$prices    = $this->get_filtered_price();
		$min_price = $prices->min_price;
		$max_price = $prices->max_price;

		// Check to see if we should add taxes to the prices if store are excl tax but display incl.
		$tax_display_mode = get_option( 'woocommerce_tax_display_shop' );

		if ( wc_tax_enabled() && ! wc_prices_include_tax() && 'incl' === $tax_display_mode ) {
			$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 ) {
				$min_price += WC_Tax::get_tax_total( WC_Tax::calc_exclusive_tax( $min_price, $tax_rates ) );
				$max_price += WC_Tax::get_tax_total( WC_Tax::calc_exclusive_tax( $max_price, $tax_rates ) );
			}
		}

		$min_price = apply_filters( 'woocommerce_price_filter_widget_min_amount', floor( $min_price / $step ) * $step );
		$max_price = apply_filters( 'woocommerce_price_filter_widget_max_amount', ceil( $max_price / $step ) * $step );

		// If both min and max are equal, we don't need a slider.
		if ( $min_price === $max_price ) {
			return;
		}

		$current_min_price = isset( $_GET['min_price'] ) ? floor( floatval( wp_unslash( $_GET['min_price'] ) ) / $step ) * $step : $min_price; // WPCS: input var ok, CSRF ok.
		$current_max_price = isset( $_GET['max_price'] ) ? ceil( floatval( wp_unslash( $_GET['max_price'] ) ) / $step ) * $step : $max_price; // WPCS: input var ok, CSRF ok.

		$this->widget_start( $args, $instance );

		if ( '' === get_option( 'permalink_structure' ) ) {
			$form_action = remove_query_arg( array( 'page', 'paged', 'product-page' ), add_query_arg( $wp->query_string, '', home_url( $wp->request ) ) );
		} else {
			$form_action = preg_replace( '%\/page/[0-9]+%', '', home_url( trailingslashit( $wp->request ) ) );
		}

		wc_get_template(
			'content-widget-price-filter.php',
			array(
				'form_action'       => $form_action,
				'step'              => $step,
				'min_price'         => $min_price,
				'max_price'         => $max_price,
				'current_min_price' => $current_min_price,
				'current_max_price' => $current_max_price,
			)
		);

		$this->widget_end( $args );
	}

	/**
	 * Get filtered min price for current products.
	 *
	 * @return int
	 */
	protected function get_filtered_price() {
		global $wpdb;

		$args       = WC()->query->get_main_query()->query_vars;
		$tax_query  = isset( $args['tax_query'] ) ? $args['tax_query'] : array();
		$meta_query = isset( $args['meta_query'] ) ? $args['meta_query'] : array();

		if ( ! is_post_type_archive( 'product' ) && ! empty( $args['taxonomy'] ) && ! empty( $args['term'] ) ) {
			$tax_query[] = WC()->query->get_main_tax_query();
		}

		foreach ( $meta_query + $tax_query as $key => $query ) {
			if ( ! empty( $query['price_filter'] ) || ! empty( $query['rating_filter'] ) ) {
				unset( $meta_query[ $key ] );
			}
		}

		$meta_query = new WP_Meta_Query( $meta_query );
		$tax_query  = new WP_Tax_Query( $tax_query );
		$search     = WC_Query::get_main_search_query_sql();

		$meta_query_sql   = $meta_query->get_sql( 'post', $wpdb->posts, 'ID' );
		$tax_query_sql    = $tax_query->get_sql( $wpdb->posts, 'ID' );
		$search_query_sql = $search ? ' AND ' . $search : '';

		$sql = "
			SELECT min( min_price ) as min_price, MAX( max_price ) as max_price
			FROM {$wpdb->wc_product_meta_lookup}
			WHERE product_id IN (
				SELECT ID FROM {$wpdb->posts}
				" . $tax_query_sql['join'] . $meta_query_sql['join'] . "
				WHERE {$wpdb->posts}.post_type IN ('" . implode( "','", array_map( 'esc_sql', apply_filters( 'woocommerce_price_filter_post_type', array( 'product' ) ) ) ) . "')
				AND {$wpdb->posts}.post_status = 'publish'
				" . $tax_query_sql['where'] . $meta_query_sql['where'] . $search_query_sql . '
			)';

		$sql = apply_filters( 'woocommerce_price_filter_sql', $sql, $meta_query_sql, $tax_query_sql );

		return $wpdb->get_row( $sql ); // WPCS: unprepared SQL ok.
	}
}