add_action( 'after_setup_theme', 'replace_simple_slider', 20 );

function replace_simple_slider() {
    remove_shortcode('vc_simple_slider');
    add_shortcode('vc_simple_slider', 'my_simple_slider');
}

function my_simple_slider($attributes) {
    $post = get_post();

    static $instance = 0;
    $instance++;

    if ( ! empty( $attributes['ids'] ) )
    {
        // 'ids' is explicitly ordered, unless you specify otherwise.
        if ( empty( $attributes['orderby'] ) )
        {
            $attributes['orderby'] = 'post__in';
        }
        $attributes['include'] = $attributes['ids'];
    }

    // We're trusting author input, so let's at least make sure it looks like a valid orderby statement
    if ( isset( $attributes['orderby'] ) )
    {
        $attributes['orderby'] = sanitize_sql_orderby( $attributes['orderby'] );
        if ( !$attributes['orderby'] )
        {
            unset( $attributes['orderby'] );
        }
    }

    extract(shortcode_atts(array(
        'order'      => 'ASC',
        'orderby'    => 'menu_order ID',
        'id'         => $post->ID,
        'itemtag'    => 'dl',
        'icontag'    => 'dt',
        'captiontag' => 'dd',
        'columns'    => 3,
        'type'       => 's',
        'include'    => '',
        'exclude'    => '',
        'auto_rotation'    => null,
    ), $attributes));

    $type_classes = ' type_slider';
    $size = 'gallery-full';

    $id = intval($id);

    if ( !empty($include) )
    {
        $_attachments = get_posts( array('include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );

        $attachments = array();
        if (is_array($_attachments))
        {
            foreach ( $_attachments as $key => $val ) {
                $attachments[$val->ID] = $_attachments[$key];
            }
        }
    }
    elseif ( !empty($exclude) )
    {
        $attachments = get_children( array('post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
    }
    else
    {
        $attachments = get_children( array('post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby) );
    }

    if ( empty($attachments) )
    {
        return '';
    }

    $rand_id = rand(100000, 999999);
    $output = '<div class="w-gallery'.$type_classes.'"><div class="w-gallery-main"><div class="w-gallery-main-h flexslider flex-loading" id="slider_'.$rand_id.'">';

    $i = 1;
    if (is_array($attachments))
    {

        $output .= '<ul class="slides">';
        foreach ( $attachments as $id => $attachment ) {

            $output .= '<li>';
            $output .= wp_get_attachment_image( $id, $size, 0 );
            $output .= '</li>';

            $i++;

        }
        $output .= '</ul>';

    }

    $output .= "</div></div></div>\n";

    $disable_rotation = '';
    if ( ! ($auto_rotation == 'yes' OR $auto_rotation == 1)) {
        $disable_rotation = 'slideshow: false,';
    }

    $output .= '<script type="text/javascript">
                    jQuery(window).load(function() {
                        jQuery("#slider_'.$rand_id.'").flexslider({
                            '.$disable_rotation.'controlsContainer: "#slider_'.$rand_id.'",
                            directionalNav: true,
                            controlNav: true,
                            start: function(slider) {
                                slider.resize();
                                jQuery("#slider_'.$rand_id.'").removeClass("flex-loading");
                            }
                        });
                    });
                </script>';
   $output .=  '<style>
                .flexslider {
                    overflow: visible;
                    margin-bottom: 30px;
                }
                .g-html ol.flex-control-nav {
                    width: 100%;
                    position: absolute;
                    bottom: -42px;
                    text-align: center;
                    margin: 0;
                }

                .flex-control-nav li {
                    margin: 0 6px;
                    display: inline-block;
                    zoom: 1;
                }

                .flex-control-paging li a {
                    width: 11px;
                    height: 11px;
                    display: block;
                    background: rgba(127,127,127,0.5);
                    cursor: pointer;
                    text-indent: -9999px;
                    -webkit-border-radius: 20px;
                    -moz-border-radius: 20px;
                    -o-border-radius: 20px;
                    border-radius: 20px;
                    -webkit-box-shadow: inset 0 0 3px rgba(127,127,127,0.3);
                    -moz-box-shadow: inset 0 0 3px rgba(127,127,127,0.3);
                    -o-box-shadow: inset 0 0 3px rgba(127,127,127,0.3);
                    box-shadow: inset 0 0 3px rgba(127,127,127,0.3);
                }

                .flex-control-paging li a:hover {
                    background: rgba(127,127,127,0.7);
                }

                .flex-control-paging li a.flex-active {
                    background: rgba(127,127,127,0.9);
                    cursor: default;
                }

                .no-touch .g-html li a:hover {
                    border-bottom: none;
                }</style>';

    return $output;
}