<?php

/**

 * Widget API: WP_Widget_Categories class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core class used to implement a Categories widget.

 *

 * @since 2.8.0

 *

 * @see WP_Widget

 */

class WP_Widget_Categories extends WP_Widget {

	/**

	 * Sets up a new Categories widget instance.

	 *

	 * @since 2.8.0

	 */

	public function __construct() {

		$widget_ops = array(

			'classname'                   => 'widget_categories',

			'description'                 => __( 'A list or dropdown of categories.' ),

			'customize_selective_refresh' => true,

			'show_instance_in_rest'       => true,

		);

		parent::__construct( 'categories', __( 'Categories' ), $widget_ops );

	}

	/**

	 * Outputs the content for the current Categories widget instance.

	 *

	 * @since 2.8.0

	 * @since 4.2.0 Creates a unique HTML ID for the `<select>` element

	 *              if more than one instance is displayed on the page.

	 *

	 * @param array $args     Display arguments including 'before_title', 'after_title',

	 *                        'before_widget', and 'after_widget'.

	 * @param array $instance Settings for the current Categories widget instance.

	 */

	public function widget( $args, $instance ) {

		static $first_dropdown = true;

		$default_title = __( 'Categories' );

		$title         = ! empty( $instance['title'] ) ? $instance['title'] : $default_title;

		/** This filter is documented in wp-includes/widgets/class-wp-widget-pages.php */

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

		$count        = ! empty( $instance['count'] ) ? '1' : '0';

		$hierarchical = ! empty( $instance['hierarchical'] ) ? '1' : '0';

		$dropdown     = ! empty( $instance['dropdown'] ) ? '1' : '0';

		echo $args['before_widget'];

		if ( $title ) {

			echo $args['before_title'] . $title . $args['after_title'];

		}

		$cat_args = array(

			'orderby'      => 'name',

			'show_count'   => $count,

			'hierarchical' => $hierarchical,

		);

		if ( $dropdown ) {

			printf( '<form action="%s" method="get">', esc_url( home_url() ) );

			$dropdown_id    = ( $first_dropdown ) ? 'cat' : "{$this->id_base}-dropdown-{$this->number}";

			$first_dropdown = false;

			echo '<label class="screen-reader-text" for="' . esc_attr( $dropdown_id ) . '">' . $title . '</label>';

			$cat_args['show_option_none'] = __( 'Select Category' );

			$cat_args['id']               = $dropdown_id;

			/**

			 * Filters the arguments for the Categories widget drop-down.

			 *

			 * @since 2.8.0

			 * @since 4.9.0 Added the `$instance` parameter.

			 *

			 * @see wp_dropdown_categories()

			 *

			 * @param array $cat_args An array of Categories widget drop-down arguments.

			 * @param array $instance Array of settings for the current widget.

			 */

			wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args, $instance ) );

			echo '</form>';

			$type_attr = current_theme_supports( 'html5', 'script' ) ? '' : ' type="text/javascript"';

			?>

<script<?php echo $type_attr; ?>>

/* <![CDATA[ */

(function() {

	var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" );

	function onCatChange() {

		if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) {

			dropdown.parentNode.submit();

		}

	}

	dropdown.onchange = onCatChange;

})();

/* ]]> */

</script>

			<?php

		} else {

			$format = current_theme_supports( 'html5', 'navigation-widgets' ) ? 'html5' : 'xhtml';

			/** This filter is documented in wp-includes/widgets/class-wp-nav-menu-widget.php */

			$format = apply_filters( 'navigation_widgets_format', $format );

			if ( 'html5' === $format ) {

				// The title may be filtered: Strip out HTML and make sure the aria-label is never empty.

				$title      = trim( strip_tags( $title ) );

				$aria_label = $title ? $title : $default_title;

			}

			?>

			<ul>

				<?php

				$cat_args['title_li'] = '';

				/**

				 * Filters the arguments for the Categories widget.

				 *

				 * @since 2.8.0

				 * @since 4.9.0 Added the `$instance` parameter.

				 *

				 * @param array $cat_args An array of Categories widget options.

				 * @param array $instance Array of settings for the current widget.

				 */

				wp_list_categories( apply_filters( 'widget_categories_args', $cat_args, $instance ) );

				?>

			</ul>

			<?php

			if ( 'html5' === $format ) {

				echo '</nav>';

			}

		}

		echo $args['after_widget'];

	}

	/**

	 * Handles updating settings for the current Categories widget instance.

	 *

	 * @since 2.8.0

	 *

	 * @param array $new_instance New settings for this instance as input by the user via

	 *                            WP_Widget::form().

	 * @param array $old_instance Old settings for this instance.

	 * @return array Updated settings to save.

	 */

	public function update( $new_instance, $old_instance ) {

		$instance                 = $old_instance;

		$instance['title']        = sanitize_text_field( $new_instance['title'] );

		$instance['count']        = ! empty( $new_instance['count'] ) ? 1 : 0;

		$instance['hierarchical'] = ! empty( $new_instance['hierarchical'] ) ? 1 : 0;

		$instance['dropdown']     = ! empty( $new_instance['dropdown'] ) ? 1 : 0;

		return $instance;

	}

	/**

	 * Outputs the settings form for the Categories widget.

	 *

	 * @since 2.8.0

	 *

	 * @param array $instance Current settings.

	 */

	public function form( $instance ) {

		// Defaults.

		$instance     = wp_parse_args( (array) $instance, array( 'title' => '' ) );

		$count        = isset( $instance['count'] ) ? (bool) $instance['count'] : false;

		$hierarchical = isset( $instance['hierarchical'] ) ? (bool) $instance['hierarchical'] : false;

		$dropdown     = isset( $instance['dropdown'] ) ? (bool) $instance['dropdown'] : false;

		?>

		<p>

			<label for="<?php echo $this->get_field_id( 'title' ); ?>"><?php _e( 'Title:' ); ?></label>

			<input class="widefat" id="<?php echo $this->get_field_id( 'title' ); ?>" name="<?php echo $this->get_field_name( 'title' ); ?>" type="text" value="<?php echo esc_attr( $instance['title'] ); ?>" />

		</p>

		<p>

			<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'dropdown' ); ?>" name="<?php echo $this->get_field_name( 'dropdown' ); ?>"<?php checked( $dropdown ); ?> />

			<label for="<?php echo $this->get_field_id( 'dropdown' ); ?>"><?php _e( 'Display as dropdown' ); ?></label>

			<br />

			<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'count' ); ?>" name="<?php echo $this->get_field_name( 'count' ); ?>"<?php checked( $count ); ?> />

			<label for="<?php echo $this->get_field_id( 'count' ); ?>"><?php _e( 'Show post counts' ); ?></label>

			<br />

			<input type="checkbox" class="checkbox" id="<?php echo $this->get_field_id( 'hierarchical' ); ?>" name="<?php echo $this->get_field_name( 'hierarchical' ); ?>"<?php checked( $hierarchical ); ?> />

			<label for="<?php echo $this->get_field_id( 'hierarchical' ); ?>"><?php _e( 'Show hierarchy' ); ?></label>

		</p>

		<?php

	}

}