<?php
/**
 * Widget API: WP_Widget_Links class
 *
 * @package WordPress
 * @subpackage Widgets
 * @since 4.4.0
 */

/**
 * Core class used to implement a Links widget.
 *
 * @since 2.8.0
 *
 * @see WP_Widget
 */
class WP_Widget_Links extends WP_Widget {

    /**
     * Sets up a new Links widget instance.
     *
     * @since 2.8.0
     */
    public function __construct() {
        $widget_ops = array(
            'description'                 => __( 'Your blogroll' ),
            'customize_selective_refresh' => true,
        );
        parent::__construct( 'links', __( 'Links' ), $widget_ops );
    }

    /**
     * Outputs the content for the current Links 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 Links widget instance.
     */
    public function widget( $args, $instance ) {
        $show_description = $instance['description'] ?? false;
        $show_name        = $instance['name'] ?? false;
        $show_rating      = $instance['rating'] ?? false;
        $show_images      = $instance['images'] ?? true;
        $category         = $instance['category'] ?? false;
        $orderby          = $instance['orderby'] ?? 'name';
        $order            = 'rating' === $orderby ? 'DESC' : 'ASC';
        $limit            = $instance['limit'] ?? -1;

        $before_widget = preg_replace( '/ id="[^"]*"/', ' id="%id"', $args['before_widget'] );

        $widget_links_args = array(
            'title_before'     => $args['before_title'],
            'title_after'      => $args['after_title'],
            'category_before'  => $before_widget,
            'category_after'   => $args['after_widget'],
            'show_images'      => $show_images,
            'show_description' => $show_description,
            'show_name'        => $show_name,
            'show_rating'      => $show_rating,
            'category'         => $category,
            'class'            => 'linkcat widget',
            'orderby'          => $orderby,
            'order'            => $order,
            'limit'            => $limit,
        );

        /**
         * Filters the arguments for the Links widget.
         *
         * @since 2.6.0
         * @since 4.4.0 Added the `$instance` parameter.
         *
         * @see wp_list_bookmarks()
         *
         * @param array $widget_links_args An array of arguments to retrieve the links list.
         * @param array $instance          The settings for the particular instance of the widget.
         */
        wp_list_bookmarks( apply_filters( 'widget_links_args', $widget_links_args, $instance ) );
    }

    /**
     * Handles updating settings for the current Links 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 ) {
        $new_instance = (array) $new_instance;
        $instance     = array(
            'images'      => 0,
            'name'        => 0,
            'description' => 0,
            'rating'      => 0,
        );
        foreach ( $instance as $field => $val ) {
            if ( isset( $new_instance[ $field ] ) ) {
                $instance[ $field ] = 1;
            }
        }

        $instance['orderby'] = 'name';
        if ( in_array( $new_instance['orderby'], array( 'name', 'rating', 'id', 'rand' ), true ) ) {
            $instance['orderby'] = $new_instance['orderby'];
        }

        $instance['category'] = (int) $new_instance['category'];
        $instance['limit']    = ! empty( $new_instance['limit'] ) ? (int) $new_instance['limit'] : -1;

        return $instance;
    }

    /**
     * Outputs the settings form for the Links widget.
     *
     * @since 2.8.0
     *
     * @param array $instance Current settings.
     */
    public function form( $instance ) {

        // Defaults.
        $instance  = wp_parse_args(
            (array) $instance,
            array(
                'images'      => true,
                'name'        => true,
                'description' => false,
                'rating'      => false,
                'category'    => false,
                'orderby'     => 'name',
                'limit'       => -1,
            )
        );
        $link_cats = get_terms( array( 'taxonomy' => 'link_category' ) );
        $limit     = (int) $instance['limit'];
        if ( ! $limit ) {
            $limit = -1;
        }
        ?>
        <p>
            <label for="<?php echo $this->get_field_id( 'category' ); ?>"><?php _e( 'Select Link Category:' ); ?></label>
            <select class="widefat" id="<?php echo $this->get_field_id( 'category' ); ?>" name="<?php echo $this->get_field_name( 'category' ); ?>">
                <option value=""><?php _ex( 'All Links', 'links widget' ); ?></option>
                <?php foreach ( $link_cats as $link_cat ) : ?>
                    <option value="<?php echo (int) $link_cat->term_id; ?>" <?php selected( $instance['category'], $link_cat->term_id ); ?>>
                        <?php echo esc_html( $link_cat->name ); ?>
                    </option>
                <?php endforeach; ?>
            </select>
            <label for="<?php echo $this->get_field_id( 'orderby' ); ?>"><?php _e( 'Sort by:' ); ?></label>
            <select name="<?php echo $this->get_field_name( 'orderby' ); ?>" id="<?php echo $this->get_field_id( 'orderby' ); ?>" class="widefat">
                <option value="name"<?php selected( $instance['orderby'], 'name' ); ?>><?php _e( 'Link title' ); ?></option>
                <option value="rating"<?php selected( $instance['orderby'], 'rating' ); ?>><?php _e( 'Link rating' ); ?></option>
                <option value="id"<?php selected( $instance['orderby'], 'id' ); ?>><?php _e( 'Link ID' ); ?></option>
                <option value="rand"<?php selected( $instance['orderby'], 'rand' ); ?>><?php _ex( 'Random', 'Links widget' ); ?></option>
            </select>
        </p>

        <p>
            <input class="checkbox" type="checkbox"<?php checked( $instance['images'], true ); ?> id="<?php echo $this->get_field_id( 'images' ); ?>" name="<?php echo $this->get_field_name( 'images' ); ?>" />
            <label for="<?php echo $this->get_field_id( 'images' ); ?>"><?php _e( 'Show Link Image' ); ?></label>
            <br />

            <input class="checkbox" type="checkbox"<?php checked( $instance['name'], true ); ?> id="<?php echo $this->get_field_id( 'name' ); ?>" name="<?php echo $this->get_field_name( 'name' ); ?>" />
            <label for="<?php echo $this->get_field_id( 'name' ); ?>"><?php _e( 'Show Link Name' ); ?></label>
            <br />

            <input class="checkbox" type="checkbox"<?php checked( $instance['description'], true ); ?> id="<?php echo $this->get_field_id( 'description' ); ?>" name="<?php echo $this->get_field_name( 'description' ); ?>" />
            <label for="<?php echo $this->get_field_id( 'description' ); ?>"><?php _e( 'Show Link Description' ); ?></label>
            <br />

            <input class="checkbox" type="checkbox"<?php checked( $instance['rating'], true ); ?> id="<?php echo $this->get_field_id( 'rating' ); ?>" name="<?php echo $this->get_field_name( 'rating' ); ?>" />
            <label for="<?php echo $this->get_field_id( 'rating' ); ?>"><?php _e( 'Show Link Rating' ); ?></label>
        </p>

        <p>
            <label for="<?php echo $this->get_field_id( 'limit' ); ?>"><?php _e( 'Number of links to show:' ); ?></label>
            <input id="<?php echo $this->get_field_id( 'limit' ); ?>" name="<?php echo $this->get_field_name( 'limit' ); ?>" type="text" value="<?php echo ( -1 !== $limit ) ? (int) $limit : ''; ?>" size="3" />
        </p>
        <?php
    }
}