$( document ).ready(function() {

    $.ajaxSetup({ 
         beforeSend: function(xhr, settings) {
             function getCookie(name) {
                 var cookieValue = null;
                 if (document.cookie && document.cookie != '') {
                     var cookies = document.cookie.split(';');
                     for (var i = 0; i < cookies.length; i++) {
                         var cookie = jQuery.trim(cookies[i]);
                         // Does this cookie string begin with the name we want?
                         if (cookie.substring(0, name.length + 1) == (name + '=')) {
                             cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                             break;
                         }
                     }
                 }
                 return cookieValue;
             }
             if (!(/^http:.*/.test(settings.url) || /^https:.*/.test(settings.url))) {
                 // Only send the token to relative URLs i.e. locally.
                 xhr.setRequestHeader("X-CSRFToken", getCookie('csrftoken'));
             }
         } 
    });


    var $form = $('#payment-form');
    $form.submit(payWithStripe);

    /* If you're using Stripe for payments */
    function payWithStripe(e) {
        e.preventDefault();

        /* Visual feedback */
        $form.find('[type=submit]').html('Validating <i class="fa fa-spinner fa-pulse"></i>');

        var PublishableKey = window.stripeKey;
        Stripe.setPublishableKey(PublishableKey);
        Stripe.card.createToken($form, function stripeResponseHandler(status, response) {
            if (response.error) {
                /* Visual feedback */
                $form.find('[type=submit]').html('Try again');
                /* Show Stripe errors on the form */
                $form.find('.payment-errors').text(response.error.message);
                $form.find('.payment-errors').closest('.row').show();
            } else {
                /* Visual feedback */
                $form.find('[type=submit]').html('Processing <i class="fa fa-spinner fa-pulse"></i>');
                /* Hide Stripe errors on the form */
                $form.find('.payment-errors').closest('.row').hide();
                $form.find('.payment-errors').text("");
                // response contains id and card, which contains additional card details
                var token = response.id;
                // AJAX

                //set token  on a hidden input
                $('#id_token').val(token);
                $('#billing-form').submit();
            }
        });
    }

    /* Form validation */
    $.validator.addMethod("month", function(value, element) {
      return this.optional(element) || /^(01|02|03|04|05|06|07|08|09|10|11|12)$/.test(value);
    }, "Please specify a valid 2-digit month.");

    $.validator.addMethod("year", function(value, element) {
      return this.optional(element) || /^[0-9]{2}$/.test(value);
    }, "Please specify a valid 2-digit year.");

    validator = $form.validate({
        rules: {
            cardNumber: {
                required: true,
                creditcard: true,
                digits: true
            },
            expMonth: {
                required: true,
                month: true
            },
            expYear: {
                required: true,
                year: true
            },
            cvCode: {
                required: true,
                digits: true
            }
        },
        highlight: function(element) {
            $(element).closest('.form-control').removeClass('success').addClass('error');
        },
        unhighlight: function(element) {
            $(element).closest('.form-control').removeClass('error').addClass('success');
        },
        errorPlacement: function(error, element) {
            $(element).closest('.form-group').append(error);
        }
    });

    paymentFormReady = function() {
        if ($form.find('[name=cardNumber]').hasClass("success") &&
            $form.find('[name=expMonth]').hasClass("success") &&
            $form.find('[name=expYear]').hasClass("success") &&
            $form.find('[name=cvCode]').val().length > 1) {
            return true;
        } else {
            return false;
        }
    }

    $form.find('[type=submit]').prop('disabled', true);
    var readyInterval = setInterval(function() {
        if (paymentFormReady()) {
            $form.find('[type=submit]').prop('disabled', false);
            clearInterval(readyInterval);
        }
    }, 250);

});