<?php

/**

 * Taxonomy API: Walker_Category_Checklist class

 *

 * @package WordPress

 * @subpackage Administration

 * @since 4.4.0

 */

/**

 * Core walker class to output an unordered list of category checkbox input elements.

 *

 * @since 2.5.1

 *

 * @see Walker

 * @see wp_category_checklist()

 * @see wp_terms_checklist()

 */

class Walker_Category_Checklist extends Walker {

	public $tree_type = 'category';

	public $db_fields = array(

		'parent' => 'parent',

		'id'     => 'term_id',

	); // TODO: Decouple this.

	/**

	 * Starts the list before the elements are added.

	 *

	 * @see Walker:start_lvl()

	 *

	 * @since 2.5.1

	 *

	 * @param string $output Used to append additional content (passed by reference).

	 * @param int    $depth  Depth of category. Used for tab indentation.

	 * @param array  $args   An array of arguments. See {@see wp_terms_checklist()}.

	 */

	public function start_lvl( &$output, $depth = 0, $args = array() ) {

		$indent  = str_repeat( "\t", $depth );

		$output .= "$indent<ul class='children'>\n";

	}

	/**

	 * Ends the list of after the elements are added.

	 *

	 * @see Walker::end_lvl()

	 *

	 * @since 2.5.1

	 *

	 * @param string $output Used to append additional content (passed by reference).

	 * @param int    $depth  Depth of category. Used for tab indentation.

	 * @param array  $args   An array of arguments. See {@see wp_terms_checklist()}.

	 */

	public function end_lvl( &$output, $depth = 0, $args = array() ) {

		$indent  = str_repeat( "\t", $depth );

		$output .= "$indent</ul>\n";

	}

	/**

	 * Start the element output.

	 *

	 * @see Walker::start_el()

	 *

	 * @since 2.5.1

	 * @since 5.9.0 Renamed `$category` to `$data_object` and `$id` to `$current_object_id`

	 *              to match parent class for PHP 8 named parameter support.

	 *

	 * @param string  $output            Used to append additional content (passed by reference).

	 * @param WP_Term $data_object       The current term object.

	 * @param int     $depth             Depth of the term in reference to parents. Default 0.

	 * @param array   $args              An array of arguments. See {@see wp_terms_checklist()}.

	 * @param int     $current_object_id Optional. ID of the current term. Default 0.

	 */

	public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {

		// Restores the more descriptive, specific name for use within this method.

		$category = $data_object;

		if ( empty( $args['taxonomy'] ) ) {

			$taxonomy = 'category';

		} else {

			$taxonomy = $args['taxonomy'];

		}

		if ( 'category' === $taxonomy ) {

			$name = 'post_category';

		} else {

			$name = 'tax_input[' . $taxonomy . ']';

		}

		$args['popular_cats'] = ! empty( $args['popular_cats'] ) ? array_map( 'intval', $args['popular_cats'] ) : array();

		$class = in_array( $category->term_id, $args['popular_cats'], true ) ? ' class="popular-category"' : '';

		$args['selected_cats'] = ! empty( $args['selected_cats'] ) ? array_map( 'intval', $args['selected_cats'] ) : array();

		if ( ! empty( $args['list_only'] ) ) {

			$aria_checked = 'false';

			$inner_class  = 'category';

			if ( in_array( $category->term_id, $args['selected_cats'], true ) ) {

				$inner_class .= ' selected';

				$aria_checked = 'true';

			}

			$output .= "\n" . '<li' . $class . '>' .

				'<div class="' . $inner_class . '" data-term-id=' . $category->term_id .

				' tabindex="0" role="checkbox" aria-checked="' . $aria_checked . '">' .

				/** This filter is documented in wp-includes/category-template.php */

				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</div>';

		} else {

			$is_selected         = in_array( $category->term_id, $args['selected_cats'], true );

			$is_disabled         = ! empty( $args['disabled'] );

			$li_element_id       = wp_unique_prefixed_id( "in-{$taxonomy}-{$category->term_id}-" );

			$checkbox_element_id = wp_unique_prefixed_id( "in-{$taxonomy}-{$category->term_id}-" );

			$output .= "\n<li id='" . esc_attr( $li_element_id ) . "'$class>" .

				'<label class="selectit"><input value="' . $category->term_id . '" type="checkbox" name="' . $name . '[]" id="' . esc_attr( $checkbox_element_id ) . '"' .

				checked( $is_selected, true, false ) .

				disabled( $is_disabled, true, false ) . ' /> ' .

				/** This filter is documented in wp-includes/category-template.php */

				esc_html( apply_filters( 'the_category', $category->name, '', '' ) ) . '</label>';

		}

	}

	/**

	 * Ends the element output, if needed.

	 *

	 * @see Walker::end_el()

	 *

	 * @since 2.5.1

	 * @since 5.9.0 Renamed `$category` to `$data_object` to match parent class for PHP 8 named parameter support.

	 *

	 * @param string  $output      Used to append additional content (passed by reference).

	 * @param WP_Term $data_object The current term object.

	 * @param int     $depth       Depth of the term in reference to parents. Default 0.

	 * @param array   $args        An array of arguments. See {@see wp_terms_checklist()}.

	 */

	public function end_el( &$output, $data_object, $depth = 0, $args = array() ) {

		$output .= "</li>\n";

	}

}