<?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,

		);

		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;

			}

		}

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

		/**

		 * 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.

		 */

		$tag_cloud = wp_tag_cloud( 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'];

		}

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

		echo $tag_cloud;

		echo "</div>\n";

		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 ) {

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

		$title_id = $this->get_field_id( 'title' );

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

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

		echo '<p><label for="' . $title_id .'">' . __( 'Title:' ) . '</label>

			<input type="text" class="widefat" id="' . $title_id .'" name="' . $this->get_field_name( 'title' ) .'" value="' . $instance['title'] .'" />

		</p>';

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

		$id = $this->get_field_id( 'taxonomy' );

		$name = $this->get_field_name( 'taxonomy' );

		$input = '<input type="hidden" id="' . $id . '" name="' . $name . '" value="%s" />';

		$count_checkbox = sprintf(

			'<p><input type="checkbox" class="checkbox" id="%1$s" name="%2$s"%3$s /> <label for="%1$s">%4$s</label></p>',

			$this->get_field_id( 'count' ),

			$this->get_field_name( 'count' ),

			checked( $count, true, false ),

			__( 'Show tag counts' )

		);

		switch ( count( $taxonomies ) ) {

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

		case 0:

			echo '<p>' . __( 'The tag cloud will not be displayed since there are no taxonomies that support the tag cloud widget.' ) . '</p>';

			printf( $input, '' );

			break;

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

		case 1:

			$keys = array_keys( $taxonomies );

			$taxonomy = reset( $keys );

			printf( $input, esc_attr( $taxonomy ) );

			echo $count_checkbox;

			break;

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

		default:

			printf(

				'<p><label for="%1$s">%2$s</label>' .

				'<select class="widefat" id="%1$s" name="%3$s">',

				$id,

				__( 'Taxonomy:' ),

				$name

			);

			foreach ( $taxonomies as $taxonomy => $tax ) {

				printf(

					'<option value="%s"%s>%s</option>',

					esc_attr( $taxonomy ),

					selected( $taxonomy, $current_taxonomy, false ),

					$tax->labels->name

				);

			}

			echo '</select></p>' . $count_checkbox;

		}

	}

	/**

	 * 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';

	}

}