<?php
/**
 * Product Categories Widget
 *
 * @author   Automattic
 * @category Widgets
 * @package  WooCommerce/Widgets
 * @version  2.3.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Product categories widget class.
 *
 * @extends WC_Widget
 */
class WC_Widget_Product_Categories extends WC_Widget {

	/**
	 * Category ancestors.
	 *
	 * @var array
	 */
	public $cat_ancestors;

	/**
	 * Current Category.
	 *
	 * @var bool
	 */
	public $current_cat;

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->widget_cssclass    = 'woocommerce widget_product_categories';
		$this->widget_description = __( 'A list or dropdown of product categories.', 'woocommerce' );
		$this->widget_id          = 'woocommerce_product_categories';
		$this->widget_name        = __( 'Product Categories', 'woocommerce' );
		$this->settings           = array(
			'title'  => array(
				'type'  => 'text',
				'std'   => __( 'Product categories', 'woocommerce' ),
				'label' => __( 'Title', 'woocommerce' ),
			),
			'orderby' => array(
				'type'  => 'select',
				'std'   => 'name',
				'label' => __( 'Order by', 'woocommerce' ),
				'options' => array(
					'order' => __( 'Category order', 'woocommerce' ),
					'name'  => __( 'Name', 'woocommerce' ),
				),
			),
			'dropdown' => array(
				'type'  => 'checkbox',
				'std'   => 0,
				'label' => __( 'Show as dropdown', 'woocommerce' ),
			),
			'count' => array(
				'type'  => 'checkbox',
				'std'   => 0,
				'label' => __( 'Show product counts', 'woocommerce' ),
			),
			'hierarchical' => array(
				'type'  => 'checkbox',
				'std'   => 1,
				'label' => __( 'Show hierarchy', 'woocommerce' ),
			),
			'show_children_only' => array(
				'type'  => 'checkbox',
				'std'   => 0,
				'label' => __( 'Only show children of the current category', 'woocommerce' ),
			),
			'hide_empty' => array(
				'type'  => 'checkbox',
				'std'   => 0,
				'label' => __( 'Hide empty categories', 'woocommerce' ),
			),
			'max_depth'  => array(
				'type'  => 'text',
				'std'   => '',
				'label' => __( 'Maximum depth', 'woocommerce' ),
			),
		);

		parent::__construct();
	}

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

		$count              = isset( $instance['count'] ) ? $instance['count'] : $this->settings['count']['std'];
		$hierarchical       = isset( $instance['hierarchical'] ) ? $instance['hierarchical'] : $this->settings['hierarchical']['std'];
		$show_children_only = isset( $instance['show_children_only'] ) ? $instance['show_children_only'] : $this->settings['show_children_only']['std'];
		$dropdown           = isset( $instance['dropdown'] ) ? $instance['dropdown'] : $this->settings['dropdown']['std'];
		$orderby            = isset( $instance['orderby'] ) ? $instance['orderby'] : $this->settings['orderby']['std'];
		$hide_empty         = isset( $instance['hide_empty'] ) ? $instance['hide_empty'] : $this->settings['hide_empty']['std'];
		$dropdown_args      = array(
			'hide_empty' => $hide_empty,
		);
		$list_args          = array(
			'show_count'   => $count,
			'hierarchical' => $hierarchical,
			'taxonomy'     => 'product_cat',
			'hide_empty'   => $hide_empty,
		);
		$max_depth          = absint( isset( $instance['max_depth'] ) ? $instance['max_depth'] : $this->settings['max_depth']['std'] );

		$list_args['menu_order'] = false;
		$dropdown_args['depth']  = $max_depth;
		$list_args['depth']      = $max_depth;

		if ( 'order' === $orderby ) {
			$list_args['menu_order'] = 'asc';
		} else {
			$list_args['orderby']    = 'title';
		}

		$this->current_cat   = false;
		$this->cat_ancestors = array();

		if ( is_tax( 'product_cat' ) ) {
			$this->current_cat   = $wp_query->queried_object;
			$this->cat_ancestors = get_ancestors( $this->current_cat->term_id, 'product_cat' );

		} elseif ( is_singular( 'product' ) ) {
			$product_category = wc_get_product_terms( $post->ID, 'product_cat', apply_filters( 'woocommerce_product_categories_widget_product_terms_args', array(
				'orderby' => 'parent',
			) ) );

			if ( ! empty( $product_category ) ) {
				$this->current_cat   = end( $product_category );
				$this->cat_ancestors = get_ancestors( $this->current_cat->term_id, 'product_cat' );
			}
		}

		// Show Siblings and Children Only.
		if ( $show_children_only && $this->current_cat ) {
			if ( $hierarchical ) {
				$include = array_merge(
					$this->cat_ancestors,
					array( $this->current_cat->term_id ),
					get_terms(
						'product_cat',
						array(
							'fields'       => 'ids',
							'parent'       => 0,
							'hierarchical' => true,
							'hide_empty'   => false,
						)
					),
					get_terms(
						'product_cat',
						array(
							'fields'       => 'ids',
							'parent'       => $this->current_cat->term_id,
							'hierarchical' => true,
							'hide_empty'   => false,
						)
					)
				);
				// Gather siblings of ancestors.
				if ( $this->cat_ancestors ) {
					foreach ( $this->cat_ancestors as $ancestor ) {
						$include = array_merge( $include, get_terms(
							'product_cat',
							array(
								'fields'       => 'ids',
								'parent'       => $ancestor,
								'hierarchical' => false,
								'hide_empty'   => false,
							)
						) );
					}
				}
			} else {
				// Direct children.
				$include = get_terms(
					'product_cat',
					array(
						'fields'       => 'ids',
						'parent'       => $this->current_cat->term_id,
						'hierarchical' => true,
						'hide_empty'   => false,
					)
				);
			} // End if().

			$list_args['include']     = implode( ',', $include );
			$dropdown_args['include'] = $list_args['include'];

			if ( empty( $include ) ) {
				return;
			}
		} elseif ( $show_children_only ) {
			$dropdown_args['depth']        = 1;
			$dropdown_args['child_of']     = 0;
			$dropdown_args['hierarchical'] = 1;
			$list_args['depth']            = 1;
			$list_args['child_of']         = 0;
			$list_args['hierarchical']     = 1;
		} // End if().

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

		if ( $dropdown ) {
			wc_product_dropdown_categories( apply_filters( 'woocommerce_product_categories_widget_dropdown_args', wp_parse_args( $dropdown_args, array(
				'show_count'         => $count,
				'hierarchical'       => $hierarchical,
				'show_uncategorized' => 0,
				'orderby'            => $orderby,
				'selected'           => $this->current_cat ? $this->current_cat->slug : '',
			) ) ) );
			wc_enqueue_js( "
				jQuery( '.dropdown_product_cat' ).change( function() {
					if ( jQuery(this).val() != '' ) {
						var this_page = '';
						var home_url  = '" . esc_js( home_url( '/' ) ) . "';
						if ( home_url.indexOf( '?' ) > 0 ) {
							this_page = home_url + '&product_cat=' + jQuery(this).val();
						} else {
							this_page = home_url + '?product_cat=' + jQuery(this).val();
						}
						location.href = this_page;
					}
				});
			" );
		} else {
			include_once( WC()->plugin_path() . '/includes/walkers/class-product-cat-list-walker.php' );

			$list_args['walker']                     = new WC_Product_Cat_List_Walker;
			$list_args['title_li']                   = '';
			$list_args['pad_counts']                 = 1;
			$list_args['show_option_none']           = __( 'No product categories exist.', 'woocommerce' );
			$list_args['current_category']           = ( $this->current_cat ) ? $this->current_cat->term_id : '';
			$list_args['current_category_ancestors'] = $this->cat_ancestors;
			$list_args['max_depth']                  = $max_depth;

			echo '<ul class="product-categories">';

			wp_list_categories( apply_filters( 'woocommerce_product_categories_widget_args', $list_args ) );

			echo '</ul>';
		} // End if().

		$this->widget_end( $args );
	}
}
