// Call datepicker functionality in your custom text field
<?php
add_action('woocommerce_after_order_notes', 'ncydesign_end_datepicker_field', 10, 1);
function ncydesign_end_datepicker_field( $checkout ) {

date_default_timezone_set('America/Los_Angeles');
$mydateoptions = array('' => __('Select PickupDate', 'woocommerce' ));

echo '<div id="my_custom_checkout_field">
    <h3>'.__('Delivery Date').'</h3>';
    $today = date("Y-m-d");
    echo '<div id="start_date_checkout_field"><input type="date" min="'.$today.'" onchange="changeamount(this.value)" name="calendarstart">';
        // YOUR SCRIPT HERE BELOW
        echo '
        <script>
            jQuery(function($){
                $("#datepickerend").datepicker();
            });
        </script>';

        /* woocommerce_form_field( 'delivery_date_end', array(
        'type'          => 'text',
        'class'         => array('my-field-class form-row-wide'),
        'id'            => 'datepickerend',
        'required'      => false,
        'label'         => __('Delivery Date'),
        'placeholder'       => __('Select Date'),
        'options'     =>   $mydateoptions
        ),
        $checkout->get_value( 'cylinder_collet_date' ));*/

        echo '</div>';
    }
    /**
    * Process the checkout
    **/
    add_action('woocommerce_checkout_process', 'my_custom_checkout_field_end_process');

    function my_custom_checkout_field_end_process() {
    global $woocommerce;

    // Check if set, if its not set add an error.
    if (!$_POST['delivery_date_end'])
    wc_add_notice( '<strong>Delivery Date</strong> ' . __( 'is a required field.', 'woocommerce' ), 'error' );
    }
    /**
    * Update the order meta with custom fields values
    * */
    add_action('woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_end_order_meta');

    function my_custom_checkout_field_update_end_order_meta($order_id) {

    if (!empty($_POST['delivery_date_end'])) {
    update_post_meta($order_id, 'End Date', sanitize_text_field($_POST['delivery_date_end']));
    }
    }
    add_action( 'wp_enqueue_scripts', 'enabling_start_date_picker' );
    function enabling_start_date_picker() {

    // Only on front-end and checkout page
    if( is_admin() || ! is_checkout() ) return;

    // Load the datepicker jQuery-ui plugin script
    wp_enqueue_script( 'jquery-ui-datepicker' );
    }

    // Call datepicker functionality in your custom text field
    add_action('woocommerce_after_order_notes', 'ncydesign_start_datepicker_field', 10, 1);
    function ncydesign_start_datepicker_field( $checkout ) {

    date_default_timezone_set('America/Los_Angeles');
    $mydateoptions = array('' => __('Select PickupDate', 'woocommerce' ));

    echo '<div id="start_date_checkout_field">
        <h3>'.__('start Date').'</h3>';


        global $woocommerce;

        //print_r($_COOKIE);
        $amount = floatval( preg_replace( '#[^\d.]#', '', $woocommerce->cart->get_cart_total() ) );
        // YOUR SCRIPT HERE BELOW
        //print_r($woocommerce->cart);
        echo $amount;
        ?>
        <input type="date" onchange="changeamount(this.value)" name="calendarend">
        <script>
            jQuery(function($){
                $("#datepickerstart").datepicker();
            });

            function changeamount($thiss){
                var amouns = '<?php echo $amount ?>';
                var s = jQuery( "input[name=calendarstart]" ).val();

                var e = jQuery( "input[name=calendarend]" ).val();

                if(s){
                    if(e){




                        jQuery.ajax({
                            url: "<?php echo admin_url('admin-ajax.php') ?>",
                            type: "POST",
                            data: "action=cats&d1="+s+"&d2="+e+"&amount="+amouns, // можно также передать в виде массива или объекта
                            success: function( data ) {
                                //alert(data);
                                //woocommerce-Price-currencySymbol
                                var cur = jQuery( ".woocommerce-Price-currencySymbol:eq(1)" ).text();
                                //alert(data);
                                jQuery( ".woocommerce-Price-amount:eq(1)" ).text(cur+data);
                                jQuery( ".woocommerce-Price-amount:eq(2)" ).text(cur+data);
                            }
                        });
                    }
                }
            }

        </script>
<?php




add_action('woocommerce_checkout_process', 'my_custom_checkout_start_field_process');

function my_custom_checkout_start_field_process() {
    global $woocommerce;

    // Check if set, if its not set add an error.
    if (!$_POST['delivery_date_start'])
        wc_add_notice( '<strong>Delivery Date</strong> ' . __( 'is a required field.', 'woocommerce' ), 'error' );
}
/**
 * Update the order meta with custom fields values
 * */
add_action('woocommerce_checkout_update_order_meta', 'my_custom_checkout_field_update_order_meta');

function my_custom_checkout_field_update_order_meta($order_id) {

    if (!empty($_POST['delivery_date_start'])) {
        update_post_meta($order_id, 'start Date', sanitize_text_field($_POST['delivery_date_start']));
    }
}
add_action( 'wp_ajax_cats', 'sets_days_amount' );
add_action( 'wp_ajax_nopriv_cats', 'sets_days_amount' );
function sets_days_amount(){
// Первая дата
    $d1 = $_POST['d1'];

// Вторая дата
    $d2 = $_POST['d2'];

    $amoun = $_POST['amount'];

// timestamp первой даты
    $d1_ts = strtotime($d1);

// timestamp второй даты
    $d2_ts = strtotime($d2);

// Количество секунд
// Функция abs нужна, чтобы не проверять какая из двух дат больше
    $seconds = abs($d1_ts - $d2_ts);

// Количество дней нужно округлить в меньшую сторону,
// чтобы узнать точное количество прошедших дней
// 86400 - количество секунд в 1 дней (60 * 60 * 24)
    $days = floor($seconds / 86400);

//return $days;//3

    $daysCoupon = 2;
    $coupon = 10;

    $coupon = $coupon/100;
    $datetimeFrom = DateTime::createFromFormat( 'Y-m-d', $d1 );
    $datetimeTo = DateTime::createFromFormat( 'Y-m-d', $d2 );

    $days = $datetimeFrom->diff( $datetimeTo )->format( '%a' ); # 366 days


    if((int)$days >= 8 AND (int)$days <= 14){

        $coupon = 5;

        $coupon = $coupon/100;
        $amoun = $amoun*$days;
        $skid = $amoun*$coupon;

        $am  =$amoun-$skid;
        global $woocommerce;

        add_action( 'woocommerce_review_order_before_order_total', 'custom_cart_total' );
        add_action( 'woocommerce_before_cart_totals', 'custom_cart_total' );
        function custom_cart_total() {

            if ( is_admin() && ! defined( 'DOING_AJAX' ) )
                return;
            global $am;
            WC()->cart->total = $am;
        }
        echo $am;
        die();
    }elseif($days > 14){
        $coupon = 10;
        $coupon = $coupon/100;
        $amoun = $amoun*$days;
        $skid = $amoun*$coupon;

        $am  =$amoun-$skid;
        global $woocommerce;

        add_action( 'woocommerce_review_order_before_order_total', 'custom_cart_total' );
        add_action( 'woocommerce_before_cart_totals', 'custom_cart_total' );
        function custom_cart_total() {

            if ( is_admin() && ! defined( 'DOING_AJAX' ) )
                return;
            global $am;
            WC()->cart->total = $am;
            //var_dump( WC()->cart->total);
        }
        echo $am;
        die();
    }else{
        echo (int)$days*$amoun;
        die();
    }



//print_r( $_POST);

}