<?php

/**

 * Widget API: WP_Widget_Tag_Cloud class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core class used to implement a Tag cloud widget.

 *

 * @since 2.8.0

 *

 * @see WP_Widget

 */

class WP_Widget_Tag_Cloud extends WP_Widget {

	/**

	 * Sets up a new Tag Cloud widget instance.

	 *

	 * @since 2.8.0

	 */

	public function __construct() {

		$widget_ops = array(

			'description'                 => __( 'A cloud of your most used tags.' ),

			'customize_selective_refresh' => true,

			'show_instance_in_rest'       => true,

		);

		parent::__construct( 'tag_cloud', __( 'Tag Cloud' ), $widget_ops );

	}

	/**

	 * Outputs the content for the current Tag Cloud widget instance.

	 *

	 * @since 2.8.0

	 *

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

	 *                        'before_widget', and 'after_widget'.

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

	 */

	public function widget( $args, $instance ) {

		$current_taxonomy = $this->_get_current_taxonomy( $instance );

		if ( ! empty( $instance['title'] ) ) {

			$title = $instance['title'];

		} else {

			if ( 'post_tag' === $current_taxonomy ) {

				$title = __( 'Tags' );

			} else {

				$tax   = get_taxonomy( $current_taxonomy );

				$title = $tax->labels->name;

			}

		}

		$default_title = $title;

		$show_count = ! empty( $instance['count'] );

		$tag_cloud = wp_tag_cloud(

			/**

			 * Filters the taxonomy used in the Tag Cloud widget.

			 *

			 * @since 2.8.0

			 * @since 3.0.0 Added taxonomy drop-down.

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

			 *

			 * @see wp_tag_cloud()

			 *

			 * @param array $args     Args used for the tag cloud widget.

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

			 */

			apply_filters(

				'widget_tag_cloud_args',

				array(

					'taxonomy'   => $current_taxonomy,

					'echo'       => false,

					'show_count' => $show_count,

				),

				$instance

			)

		);

		if ( empty( $tag_cloud ) ) {

			return;

		}

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

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

		echo $args['before_widget'];

		if ( $title ) {

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

		}

		$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;

			echo '<nav aria-label="' . esc_attr( $aria_label ) . '">';

		}

		echo '<div class="tagcloud">';

		echo $tag_cloud;

		echo "</div>\n";

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

			echo '</nav>';

		}

		echo $args['after_widget'];

	}

	/**

	 * Handles updating settings for the current Tag Cloud 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 Settings to save or bool false to cancel saving.

	 */

	public function update( $new_instance, $old_instance ) {

		$instance             = array();

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

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

		$instance['taxonomy'] = stripslashes( $new_instance['taxonomy'] );

		return $instance;

	}

	/**

	 * Outputs the Tag Cloud widget settings form.

	 *

	 * @since 2.8.0

	 *

	 * @param array $instance Current settings.

	 */

	public function form( $instance ) {

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

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

		?>

		<p>

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

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

		</p>

		<?php

		$taxonomies       = get_taxonomies( array( 'show_tagcloud' => true ), 'object' );

		$current_taxonomy = $this->_get_current_taxonomy( $instance );

		switch ( count( $taxonomies ) ) {

			// No tag cloud supporting taxonomies found, display error message.

			case 0:

				?>

				<input type="hidden" id="<?php echo $this->get_field_id( 'taxonomy' ); ?>" name="<?php echo $this->get_field_name( 'taxonomy' ); ?>" value="" />

				<p>

					<?php _e( 'The tag cloud will not be displayed since there are no taxonomies that support the tag cloud widget.' ); ?>

				</p>

				<?php

				break;

			// Just a single tag cloud supporting taxonomy found, no need to display a select.

			case 1:

				$keys     = array_keys( $taxonomies );

				$taxonomy = reset( $keys );

				?>

				<input type="hidden" id="<?php echo $this->get_field_id( 'taxonomy' ); ?>" name="<?php echo $this->get_field_name( 'taxonomy' ); ?>" value="<?php echo esc_attr( $taxonomy ); ?>" />

				<?php

				break;

			// More than one tag cloud supporting taxonomy found, display a select.

			default:

				?>

				<p>

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

					<select class="widefat" id="<?php echo $this->get_field_id( 'taxonomy' ); ?>" name="<?php echo $this->get_field_name( 'taxonomy' ); ?>">

					<?php foreach ( $taxonomies as $taxonomy => $tax ) : ?>

						<option value="<?php echo esc_attr( $taxonomy ); ?>" <?php selected( $taxonomy, $current_taxonomy ); ?>>

							<?php echo esc_html( $tax->labels->name ); ?>

						</option>

					<?php endforeach; ?>

					</select>

				</p>

				<?php

		}

		if ( count( $taxonomies ) > 0 ) {

			?>

			<p>

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

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

			</p>

			<?php

		}

	}

	/**

	 * Retrieves the taxonomy for the current Tag cloud widget instance.

	 *

	 * @since 4.4.0

	 *

	 * @param array $instance Current settings.

	 * @return string Name of the current taxonomy if set, otherwise 'post_tag'.

	 */

	public function _get_current_taxonomy( $instance ) {

		if ( ! empty( $instance['taxonomy'] ) && taxonomy_exists( $instance['taxonomy'] ) ) {

			return $instance['taxonomy'];

		}

		return 'post_tag';

	}

}