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<?php
/**
* Price Filter Widget and related functions
*
* Generates a range slider to filter products by price.
*
* @author WooThemes
* @category Widgets
* @package WooCommerce/Widgets
* @version 1.6.4
* @extends WP_Widget
*/
class WooCommerce_Widget_Price_Filter extends WP_Widget {

var $woo_widget_cssclass;
var $woo_widget_description;
var $woo_widget_idbase;
var $woo_widget_name;

/**
* constructor
*
* @access public
* @return void
*/
function WooCommerce_Widget_Price_Filter() {

/* Widget variable settings. */
$this->woo_widget_cssclass = 'widget_price_filter';
$this->woo_widget_description = __( 'Shows a price filter slider in a widget which lets you narrow down the list of shown products when viewing product categories.', 'woocommerce' );
$this->woo_widget_idbase = 'woocommerce_price_filter';
$this->woo_widget_name = __('WooCommerce Price Filter', 'woocommerce' );

/* Widget settings. */
$widget_ops = array( 'classname' => $this->woo_widget_cssclass, 'description' => $this->woo_widget_description );

/* Create the widget. */
$this->WP_Widget('price_filter', $this->woo_widget_name, $widget_ops);
}


/**
* widget function.
*
* @see WP_Widget
* @access public
* @param array $args
* @param array $instance
* @return void
*/
function widget( $args, $instance ) {
extract($args);

global $_chosen_attributes, $wpdb, $woocommerce, $wp_query, $wp;

if (!is_tax( 'product_cat' ) && !is_post_type_archive('product') && !is_tax( 'product_tag' )) return; // Not on product page - return

if ( sizeof( $woocommerce->query->unfiltered_product_ids ) == 0 ) return; // None shown - return

wp_enqueue_script( 'wc-price-slider' );

wp_localize_script( 'wc-price-slider', 'woocommerce_price_slider_params', array(
'currency_symbol' => get_woocommerce_currency_symbol(),
'currency_pos' => get_option( 'woocommerce_currency_pos' ),
'min_price' => isset( $woocommerce->session->min_price ) ? $woocommerce->session->min_price : '',
'max_price' => isset( $woocommerce->session->max_price ) ? $woocommerce->session->max_price : ''
) );

$title = $instance['title'];
$title = apply_filters('widget_title', $title, $instance, $this->id_base);

// Remember current filters/search
$fields = '';

if (get_search_query()) $fields = '<input type="hidden" name="s" value="'.get_search_query().'" />';
if (isset($_GET['post_type'])) $fields .= '<input type="hidden" name="post_type" value="'.esc_attr( $_GET['post_type'] ).'" />';
if (isset($_GET['product_cat'])) $fields .= '<input type="hidden" name="product_cat" value="'.esc_attr( $_GET['product_cat'] ).'" />';
if (isset($_GET['product_tag'])) $fields .= '<input type="hidden" name="product_tag" value="'.esc_attr( $_GET['product_tag'] ).'" />';

if ($_chosen_attributes) foreach ($_chosen_attributes as $attribute => $data) :

$fields .= '<input type="hidden" name="'.esc_attr( str_replace('pa_', 'filter_', $attribute) ).'" value="'.esc_attr( implode(',', $data['terms']) ).'" />';
if ($data['query_type']=='or') $fields .= '<input type="hidden" name="'.esc_attr( str_replace('pa_', 'query_type_', $attribute) ).'" value="or" />';

endforeach;

$min = $max = 0;
$post_min = $post_max = '';

if ( sizeof( $woocommerce->query->layered_nav_product_ids ) == 0 ) :

$max = ceil($wpdb->get_var("SELECT max(meta_value + 0)
FROM $wpdb->posts
LEFT JOIN $wpdb->postmeta ON $wpdb->posts.ID = $wpdb->postmeta.post_id
WHERE meta_key = '_price'"));

else :

$max = ceil($wpdb->get_var("SELECT max(meta_value + 0)
FROM $wpdb->posts
LEFT JOIN $wpdb->postmeta ON $wpdb->posts.ID = $wpdb->postmeta.post_id
WHERE meta_key = '_price' AND (
$wpdb->posts.ID IN (".implode(',', $woocommerce->query->layered_nav_product_ids).")
OR (
$wpdb->posts.post_parent IN (".implode(',', $woocommerce->query->layered_nav_product_ids).")
AND $wpdb->posts.post_parent != 0
)
)"));

endif;

if ( $min == $max ) return;

if ( isset( $woocommerce->session->min_price ) ) $post_min = $woocommerce->session->min_price;
if ( isset( $woocommerce->session->max_price ) ) $post_max = $woocommerce->session->max_price;

echo $before_widget . $before_title . $title . $after_title;

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

echo '<form method="get" action="' . $form_action . '">
<div class="price_slider_wrapper">
<div class="price_slider" style="display:none;"></div>
<div class="price_slider_amount">
<input type="text" id="min_price" name="min_price" value="'.esc_attr( $post_min ).'" data-min="'.esc_attr( $min ).'" placeholder="'.__('Min price', 'woocommerce').'" />
<input type="text" id="max_price" name="max_price" value="'.esc_attr( $post_max ).'" data-max="'.esc_attr( $max ).'" placeholder="'.__('Max price', 'woocommerce').'" />
<button type="submit" class="button">'.__('Filter', 'woocommerce').'</button>
<div class="price_label" style="display:none;">
'.__('Price:', 'woocommerce').' <span class="from"></span> &mdash; <span class="to"></span>
</div>
'.$fields.'
<div class="clear"></div>
</div>
</div>
</form>';

echo $after_widget;
}


/**
* update function.
*
* @see WP_Widget->update
* @access public
* @param array $new_instance
* @param array $old_instance
* @return array
*/
function update( $new_instance, $old_instance ) {
if (!isset($new_instance['title']) || empty($new_instance['title'])) $new_instance['title'] = __('Filter by price', 'woocommerce');
$instance['title'] = strip_tags(stripslashes($new_instance['title']));
return $instance;
}


/**
* form function.
*
* @see WP_Widget->form
* @access public
* @param array $instance
* @return void
*/
function form( $instance ) {
global $wpdb;
?>
<p><label for="<?php echo $this->get_field_id('title'); ?>"><?php _e('Title:', 'woocommerce') ?></label>
<input type="text" class="widefat" id="<?php echo esc_attr( $this->get_field_id('title') ); ?>" name="<?php echo esc_attr( $this->get_field_name('title') ); ?>" value="<?php if (isset ( $instance['title'])) {echo esc_attr( $instance['title'] );} ?>" /></p>
<?php
}
}


/**
* Price filter Init
*
* @package WooCommerce/Widgets
* @access public
* @return void
*/
function woocommerce_price_filter_init() {
global $woocommerce;

if ( is_active_widget( false, false, 'price_filter', true ) && ! is_admin() ) {

$suffix = defined( 'SCRIPT_DEBUG' ) && SCRIPT_DEBUG ? '' : '.min';

wp_register_script( 'wc-price-slider', $woocommerce->plugin_url() . '/assets/js/frontend/price-slider' . $suffix . '.js', array( 'jquery-ui' ), '1.6', true );

unset( $woocommerce->session->min_price );
unset( $woocommerce->session->max_price );

if ( isset( $_GET['min_price'] ) )
$woocommerce->session->min_price = esc_attr( $_GET['min_price'] );

if ( isset( $_GET['max_price'] ) )
$woocommerce->session->max_price = esc_attr( $_GET['max_price'] );

add_filter( 'loop_shop_post_in', 'woocommerce_price_filter' );
}
}

add_action( 'init', 'woocommerce_price_filter_init' );


/**
* Price Filter post filter
*
* @package WooCommerce/Widgets
* @access public
* @param array $filtered_posts
* @return array
*/
function woocommerce_price_filter($filtered_posts) {
    global $wpdb;

    if ( isset( $_GET['max_price'] ) && isset( $_GET['min_price'] ) ) {

        $matched_products = array();
        $min = floatval( $_GET['min_price'] );
        $max = floatval( $_GET['max_price'] );

        $matched_products_query = $wpdb->get_results( $wpdb->prepare("
SELECT DISTINCT ID, post_parent, post_type FROM $wpdb->posts
INNER JOIN $wpdb->postmeta ON ID = post_id
WHERE post_type IN ( 'product', 'product_variation' ) AND post_status = 'publish' AND meta_key = %s AND meta_value BETWEEN %d AND %d
", '_price', $min, $max ), OBJECT_K );

        if ( $matched_products_query ) {
            foreach ( $matched_products_query as $product ) {
                if ( $product->post_type == 'product' )
                    $matched_products[] = $product->ID;
                if ( $product->post_parent > 0 && ! in_array( $product->post_parent, $matched_products ) )
                    $matched_products[] = $product->post_parent;
            }
        }

        // Filter the id's
        if ( sizeof( $filtered_posts ) == 0) {
            $filtered_posts = $matched_products;
            $filtered_posts[] = 0;
        } else {
            $filtered_posts = array_intersect( $filtered_posts, $matched_products );
            $filtered_posts[] = 0;
        }

    }

    return (array) $filtered_posts;
}
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