<?php
/**
 * Adds News_Event_Ads_Slider_Widget widget.
 * 
 * @package News Event
 * @since 1.0.0
 */
class News_Event_Ads_Slider_Widget extends WP_Widget {
    /**
     * Register widget with WordPress.
     */
    public function __construct() {
        parent::__construct(
            'news_event_ads_slider_widget',
            esc_html__( 'News Event : Ads Slider', 'news-event' ),
            array( 'description' => __( 'The slider for ads banners.', 'news-event' ) )
        );
    }

    /**
     * Front-end display of widget.
     *
     * @see WP_Widget::widget()
     *
     * @param array $args     Widget arguments.
     * @param array $instance Saved values from database.
     */
    public function widget( $args, $instance ) {
        extract( $args );
        $ads_images = isset( $instance['ads_images'] ) ? $instance['ads_images'] : '';
        $target_attr = isset( $instance['target_attr'] ) ? $instance['target_attr'] : '_blank';
        $rel_attr = isset( $instance['rel_attr'] ) ? $instance['rel_attr'] : 'nofollow';

        echo wp_kses_post( $before_widget );
        if( $ads_images ) :
            $ads_images = json_decode( $ads_images );
            if( is_array( $ads_images ) && ! empty( $ads_images ) ) :
                echo '<div class="news-event-advertisement-block">';
                    foreach( $ads_images as $ads_image ) {
                        $ads_image
                        ?>
                            <figure class="inner-ad-block">
                                <a href="<?php echo esc_url( $ads_image->ad_url ); ?>" target="<?php echo esc_attr( $target_attr ); ?>" rel="<?php echo esc_attr( $rel_attr ); ?>">
                                    <?php
                                        if( $ads_image->ad_image ) {
                                            echo '<img src="' .wp_get_attachment_url($ads_image->ad_image). '">';
                                        }
                                    ?>
                                </a>
                            </figure>
                        <?php
                    }
                echo '</div>';
            endif;
        endif;
        echo wp_kses_post( $after_widget );
    }

    /**
     * Widgets fields
     * 
     */
    function widget_fields() {
        return array(
                array(
                    'name'      => 'ads_images',
                    'type'      => 'repeater',
                    'title'     => esc_html__( 'Ads Images', 'news-event' ),
                    'default'   => json_encode(
                        array(
                            array(
                                'ad_image'    => 0,
                                'ad_url'      => '',  
                            )
                        )
                    ),
                    'fields'   => array(
                        'ad_image'    => array(
                            'label' => esc_html__( 'Ad Image', 'news-event' ),
                            'type'  => 'image',
                            'default' => 0
                        ),
                        'ad_url'    => array(
                            'label' => esc_html__( 'Ad Url', 'news-event' ),
                            'type'  => 'url',
                            'default' => ''
                        )
                    )
                ),
                array(
                    'name'      => 'target_attr',
                    'type'      => 'select',
                    'title'     => esc_html__( 'Ad link open in', 'news-event' ),
                    'default'   => '_blank',
                    'options'   => array(
                        '_blank'    => esc_html__( 'Open link in new tab', 'news-event' ),
                        '_self'    => esc_html__( 'Open link in same tab', 'news-event' )
                    )
                ),
                array(
                    'name'      => 'rel_attr',
                    'type'      => 'select',
                    'title'     => esc_html__( 'Link rel attribute value', 'news-event' ),
                    'default'   => 'nofollow',
                    'options'   => array(
                        'nofollow'  => 'nofollow',
                        'noopener'  => 'noopener',
                        'noreferrer'    => 'noreferrer'
                    )
                )
            );
    }

    /**
     * Back-end widget form.
     *
     * @see WP_Widget::form()
     *
     * @param array $instance Previously saved values from database.
     */
    public function form( $instance ) {
        $widget_fields = $this->widget_fields();
        foreach( $widget_fields as $widget_field ) :
            if ( isset( $instance[ $widget_field['name'] ] ) ) {
                $field_value = $instance[ $widget_field['name'] ];
            } else if( isset( $widget_field['default'] ) ) {
                $field_value = $widget_field['default'];
            } else {
                $field_value = '';
            }
            news_event_widget_fields( $this, $widget_field, $field_value );
        endforeach;
    }
 
    /**
     * Sanitize widget form values as they are saved.
     *
     * @see WP_Widget::update()
     *
     * @param array $new_instance Values just sent to be saved.
     * @param array $old_instance Previously saved values from database.
     *
     * @return array Updated safe values to be saved.
     */
    public function update( $new_instance, $old_instance ) {
        $instance = $old_instance;
        $widget_fields = $this->widget_fields();
        if( ! is_array( $widget_fields ) ) {
            return $instance;
        }
        foreach( $widget_fields as $widget_field ) :
            $instance[$widget_field['name']] = news_event_sanitize_widget_fields( $widget_field, $new_instance );
        endforeach;

        return $instance;
    }
}