public async Task ChangeSubscriptionPlan()

in src/AdminSite/Controllers/HomeController.cs [734:799]
54 lines of code
11 McCabe index (conditional complexity)

    public async Task<IActionResult> ChangeSubscriptionPlan(SubscriptionResult subscriptionDetail)
    {
        this.logger.Info(HttpUtility.HtmlEncode($"Home Controller / ChangeSubscriptionPlan  subscriptionDetail:{JsonSerializer.Serialize(subscriptionDetail)}"));
        try
        {
            if (subscriptionDetail.Id != default && !string.IsNullOrEmpty(subscriptionDetail.PlanId))
            {
                try
                {
                    //initiate change plan
                    var currentUserId = this.userService.GetUserIdFromEmailAddress(this.CurrentUserEmailAddress);
                    
                    var jsonResult = await this.fulfillApiService.ChangePlanForSubscriptionAsync(subscriptionDetail.Id, subscriptionDetail.PlanId).ConfigureAwait(false);
                    var changePlanOperationStatus = OperationStatusEnum.InProgress;

                    if (jsonResult != null && jsonResult.OperationId != default)
                    {
                        int _counter = 0;

                        //loop untill the operation status has moved away from inprogress or notstarted, generally this will be the result of webhooks' action aganist this operation
                        while (OperationStatusEnum.InProgress.Equals(changePlanOperationStatus) || OperationStatusEnum.NotStarted.Equals(changePlanOperationStatus))
                        {
                            var changePlanOperationResult = await this.fulfillApiService.GetOperationStatusResultAsync(subscriptionDetail.Id, jsonResult.OperationId).ConfigureAwait(false);
                            changePlanOperationStatus = changePlanOperationResult.Status;

                            this.logger.Info(HttpUtility.HtmlEncode($"Plan Change Progress. SubscriptionId: {subscriptionDetail.Id} ToPlan: {subscriptionDetail.PlanId} UserId: ****** OperationId: {jsonResult.OperationId} Operationstatus: {changePlanOperationStatus}."));
                            await this.applicationLogService.AddApplicationLog($"Plan Change Progress. SubscriptionId: {subscriptionDetail.Id} ToPlan: {subscriptionDetail.PlanId} UserId: {currentUserId} OperationId: {jsonResult.OperationId} Operationstatus: {changePlanOperationStatus}.").ConfigureAwait(false);

                            //wait and check every 5secs
                            await Task.Delay(5000);
                            _counter++;
                            if (_counter > 100)
                            {
                                //if loop has been executed for more than 100 times then break, to avoid infinite loop just in case
                                break;
                            }
                        }

                        if (changePlanOperationStatus == OperationStatusEnum.Succeeded)
                        {
                            this.logger.Info(HttpUtility.HtmlEncode($"Plan Change Success. SubscriptionId: {subscriptionDetail.Id} ToPlan : {subscriptionDetail.PlanId} UserId: ***** OperationId: {jsonResult.OperationId}."));
                            await this.applicationLogService.AddApplicationLog($"Plan Change Success. SubscriptionId: {subscriptionDetail.Id} ToPlan: {subscriptionDetail.PlanId} UserId: {currentUserId} OperationId: {jsonResult.OperationId}.").ConfigureAwait(false);
                        }
                        else
                        {
                            this.logger.Info(HttpUtility.HtmlEncode($"Plan Change Failed. SubscriptionId: {subscriptionDetail.Id} ToPlan : {subscriptionDetail.PlanId} UserId: **** OperationId: {jsonResult.OperationId} Operation status {changePlanOperationStatus}."));
                            await this.applicationLogService.AddApplicationLog($"Plan Change Failed. SubscriptionId: {subscriptionDetail.Id} ToPlan: {subscriptionDetail.PlanId} UserId: {currentUserId} OperationId: {jsonResult.OperationId} Operation status {changePlanOperationStatus}.").ConfigureAwait(false);

                            throw new MarketplaceException($"Plan change operation failed with operation status {changePlanOperationStatus}. Check if the updates are allowed in the App config \"AcceptSubscriptionUpdates\" key or db application log for more information.");
                        }
                    }
                }
                catch (MarketplaceException fex)
                {
                    this.TempData["ErrorMsg"] = fex.Message;
                }
            }

            return this.RedirectToAction(nameof(this.Subscriptions));
        }
        catch (Exception ex)
        {
            this.logger.LogError($"Message:{ex.Message} :: {ex.InnerException}");
            return this.View("Error", ex);
        }
    }