fab-manager/app/assets/javascripts/directives/coupon.js

/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
Application.Directives.directive('coupon', [ '$rootScope', 'Coupon', '_t', ($rootScope, Coupon, _t) =>
  ({
    restrict: 'E',
    scope: {
      show: '=',
      coupon: '=',
      total: '=',
      userId: '@'
    },
    templateUrl: '<%= asset_path "shared/_coupon.html" %>',
    link($scope, element, attributes) {

      // Whether code input is shown or not (ie. the link 'I have a coupon' is shown)
      $scope.code =
          {input: false};

      // Available status are: 'pending', 'valid', 'invalid'
      $scope.status = 'pending';

      // Binding for the code inputed (see the attached template)
      $scope.couponCode = null;

      // Code validation messages
      $scope.messages = [];

      // Re-compute if the code can be applied when the total of the cart changes
      $scope.$watch('total', function(newValue, oldValue) {
        if (newValue && (newValue !== oldValue) && $scope.couponCode) {
          return $scope.validateCode();
        }
      });

      //#
      // Callback to validate the code
      //#
      $scope.validateCode = function() {
        $scope.messages = [];
        if ($scope.couponCode === '') {
          $scope.status = 'pending';
          return $scope.coupon = null;
        } else {
          return Coupon.validate({code: $scope.couponCode, user_id: $scope.userId, amount: $scope.total}, function(res) {
            $scope.status = 'valid';
            $scope.coupon = res;
            if (res.type === 'percent_off') {
              return $scope.messages.push({type: 'success', message: _t('the_coupon_has_been_applied_you_get_PERCENT_discount', {PERCENT: res.percent_off})});
            } else {
              return $scope.messages.push({type: 'success', message: _t('the_coupon_has_been_applied_you_get_AMOUNT_CURRENCY', {AMOUNT: res.amount_off, CURRENCY: $rootScope.currencySymbol})});
            }
          }
          , function(err) {
            $scope.status = 'invalid';
            $scope.coupon = null;
            return $scope.messages.push({type: 'danger', message: _t(`unable_to_apply_the_coupon_because_${err.data.status}`)});
          });
        }
      };

      //#
      // Callback to remove the message at provided index from the displayed list
      //#
      return $scope.closeMessage = index => $scope.messages.splice(index, 1);
    }
  })

]);