public async Task PatchTransferHttpTrigger_ReturnsStatusCodeBadRequest_WhenUnableToUpdateTransferRecord()
        {
            _httpRequestMessageHelper.GetTransferFromRequest <TransferPatch>(_request).Returns(Task.FromResult(_transferPatch).Result);

            _resourceHelper.DoesCustomerExist(Arg.Any <Guid>()).ReturnsForAnyArgs(true);
            _resourceHelper.DoesInteractionResourceExistAndBelongToCustomer(Arg.Any <Guid>(), Arg.Any <Guid>()).Returns(true);

            _patchTransferHttpTriggerService.GetTransferForCustomerAsync(Arg.Any <Guid>(), Arg.Any <Guid>()).Returns(Task.FromResult(_transfer).Result);

            _patchTransferHttpTriggerService.UpdateAsync(Arg.Any <Models.Transfer>(), Arg.Any <TransferPatch>()).Returns(Task.FromResult <Models.Transfer>(null).Result);

            var result = await RunFunction(ValidCustomerId, ValidInteractionId, ValidTransferId);

            // Assert
            Assert.IsInstanceOf <HttpResponseMessage>(result);
            Assert.AreEqual(HttpStatusCode.BadRequest, result.StatusCode);
        }
        public static async Task <HttpResponseMessage> Run([HttpTrigger(AuthorizationLevel.Anonymous, "patch", Route = "Customers/{customerId}/Interactions/{interactionId}/Transfers/{transferId}")] HttpRequestMessage req, ILogger log, string customerId, string interactionId, string transferId,
                                                           [Inject] IResourceHelper resourceHelper,
                                                           [Inject] IHttpRequestMessageHelper httpRequestMessageHelper,
                                                           [Inject] IValidate validate,
                                                           [Inject] IPatchTransferHttpTriggerService transferPatchService)
        {
            var touchpointId = httpRequestMessageHelper.GetTouchpointId(req);

            if (string.IsNullOrEmpty(touchpointId))
            {
                log.LogInformation("Unable to locate 'TouchpointId' in request header.");
                return(HttpResponseMessageHelper.BadRequest());
            }

            var ApimURL = httpRequestMessageHelper.GetApimURL(req);

            if (string.IsNullOrEmpty(ApimURL))
            {
                log.LogInformation("Unable to locate 'apimurl' in request header");
                return(HttpResponseMessageHelper.BadRequest());
            }

            log.LogInformation("Patch Transfer C# HTTP trigger function processed a request. By Touchpoint. " + touchpointId);

            if (!Guid.TryParse(customerId, out var customerGuid))
            {
                return(HttpResponseMessageHelper.BadRequest(customerGuid));
            }

            if (!Guid.TryParse(interactionId, out var interactionGuid))
            {
                return(HttpResponseMessageHelper.BadRequest(interactionGuid));
            }

            if (!Guid.TryParse(transferId, out var transferGuid))
            {
                return(HttpResponseMessageHelper.BadRequest(transferGuid));
            }

            Models.TransferPatch transferPatchRequest;

            try
            {
                transferPatchRequest = await httpRequestMessageHelper.GetTransferFromRequest <Models.TransferPatch>(req);
            }
            catch (JsonException ex)
            {
                return(HttpResponseMessageHelper.UnprocessableEntity(ex));
            }

            if (transferPatchRequest == null)
            {
                return(HttpResponseMessageHelper.UnprocessableEntity(req));
            }

            transferPatchRequest.LastModifiedTouchpointId = touchpointId;

            var errors = validate.ValidateResource(transferPatchRequest, false);

            if (errors != null && errors.Any())
            {
                return(HttpResponseMessageHelper.UnprocessableEntity(errors));
            }

            var doesCustomerExist = await resourceHelper.DoesCustomerExist(customerGuid);

            if (!doesCustomerExist)
            {
                return(HttpResponseMessageHelper.NoContent(customerGuid));
            }

            var isCustomerReadOnly = await resourceHelper.IsCustomerReadOnly(customerGuid);

            if (isCustomerReadOnly)
            {
                return(HttpResponseMessageHelper.Forbidden(customerGuid));
            }

            var doesInteractionExist = resourceHelper.DoesInteractionResourceExistAndBelongToCustomer(interactionGuid, customerGuid);

            if (!doesInteractionExist)
            {
                return(HttpResponseMessageHelper.NoContent(interactionGuid));
            }

            var transfer = await transferPatchService.GetTransferForCustomerAsync(customerGuid, transferGuid);

            if (transfer == null)
            {
                return(HttpResponseMessageHelper.NoContent(transferGuid));
            }

            var updatedTransfer = await transferPatchService.UpdateAsync(transfer, transferPatchRequest);

            if (updatedTransfer != null)
            {
                await transferPatchService.SendToServiceBusQueueAsync(transfer, customerGuid, ApimURL);
            }

            return(updatedTransfer == null?
                   HttpResponseMessageHelper.BadRequest(transferGuid) :
                       HttpResponseMessageHelper.Ok(JsonHelper.SerializeObject(updatedTransfer)));
        }