<?php

/**

 * Widget API: WP_Nav_Menu_Widget class

 *

 * @package WordPress

 * @subpackage Widgets

 * @since 4.4.0

 */

/**

 * Core class used to implement the Navigation Menu widget.

 *

 * @since 3.0.0

 *

 * @see WP_Widget

 */

class WP_Nav_Menu_Widget extends WP_Widget {

	/**

	 * Sets up a new Navigation Menu widget instance.

	 *

	 * @since 3.0.0

	 */

	public function __construct() {

		$widget_ops = array(

			'description' => __( 'Add a navigation menu to your sidebar.' ),

			'customize_selective_refresh' => true,

		);

		parent::__construct( 'nav_menu', __('Navigation Menu'), $widget_ops );

	}

	/**

	 * Outputs the content for the current Navigation Menu widget instance.

	 *

	 * @since 3.0.0

	 *

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

	 *                        'before_widget', and 'after_widget'.

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

	 */

	public function widget( $args, $instance ) {

		// Get menu

		$nav_menu = ! empty( $instance['nav_menu'] ) ? wp_get_nav_menu_object( $instance['nav_menu'] ) : false;

		if ( ! $nav_menu ) {

			return;

		}

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

		/** 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'];

		}

		$nav_menu_args = array(

			'fallback_cb' => '',

			'menu'        => $nav_menu

		);

		/**

		 * Filters the arguments for the Navigation Menu widget.

		 *

		 * @since 4.2.0

		 * @since 4.4.0 Added the `$instance` parameter.

		 *

		 * @param array    $nav_menu_args {

		 *     An array of arguments passed to wp_nav_menu() to retrieve a navigation menu.

		 *

		 *     @type callable|bool $fallback_cb Callback to fire if the menu doesn't exist. Default empty.

		 *     @type mixed         $menu        Menu ID, slug, or name.

		 * }

		 * @param WP_Term  $nav_menu      Nav menu object for the current menu.

		 * @param array    $args          Display arguments for the current widget.

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

		 */

		wp_nav_menu( apply_filters( 'widget_nav_menu_args', $nav_menu_args, $nav_menu, $args, $instance ) );

		echo $args['after_widget'];

	}

	/**

	 * Handles updating settings for the current Navigation Menu widget instance.

	 *

	 * @since 3.0.0

	 *

	 * @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 = array();

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

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

		}

		if ( ! empty( $new_instance['nav_menu'] ) ) {

			$instance['nav_menu'] = (int) $new_instance['nav_menu'];

		}

		return $instance;

	}

	/**

	 * Outputs the settings form for the Navigation Menu widget.

	 *

	 * @since 3.0.0

	 *

	 * @param array $instance Current settings.

	 * @global WP_Customize_Manager $wp_customize

	 */

	public function form( $instance ) {

		global $wp_customize;

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

		$nav_menu = isset( $instance['nav_menu'] ) ? $instance['nav_menu'] : '';

		// Get menus

		$menus = wp_get_nav_menus();

		// If no menus exists, direct the user to go and create some.

		?>

		<p class="nav-menu-widget-no-menus-message" <?php if ( ! empty( $menus ) ) { echo ' style="display:none" '; } ?>>

			<?php

			if ( $wp_customize instanceof WP_Customize_Manager ) {

				$url = 'javascript: wp.customize.panel( "nav_menus" ).focus();';

			} else {

				$url = admin_url( 'nav-menus.php' );

			}

			?>

			<?php echo sprintf( __( 'No menus have been created yet. <a href="%s">Create some</a>.' ), esc_attr( $url ) ); ?>

		</p>

		<div class="nav-menu-widget-form-controls" <?php if ( empty( $menus ) ) { echo ' style="display:none" '; } ?>>

			<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>

			<p>

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

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

					<option value="0"><?php _e( '&mdash; Select &mdash;' ); ?></option>

					<?php foreach ( $menus as $menu ) : ?>

						<option value="<?php echo esc_attr( $menu->term_id ); ?>" <?php selected( $nav_menu, $menu->term_id ); ?>>

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

						</option>

					<?php endforeach; ?>

				</select>

			</p>

			<?php if ( $wp_customize instanceof WP_Customize_Manager ) : ?>

				<p class="edit-selected-nav-menu" style="<?php if ( ! $nav_menu ) { echo 'display: none;'; } ?>">

					<button type="button" class="button"><?php _e( 'Edit Menu' ) ?></button>

				</p>

			<?php endif; ?>

		</div>

		<?php

	}

}