private static bool TryGetEndpoint()

in RESTProxy/Models/ProxyManager.cs [277:365]
88 lines of code
12 McCabe index (conditional complexity)

        private static bool TryGetEndpoint(
            string tenantId,
            string tenantName,
            EndpointType endpointType,
            out Endpoint endpoint,
            out HttpResponseMessage errorResponse)
        {
            endpoint = null;
            errorResponse = null;
            string errorMessage = string.Empty;
            TenantEndpointCollection tenantEndpointCollection;

            try
            {
                if (string.IsNullOrWhiteSpace(tenantId) && string.IsNullOrWhiteSpace(tenantName))
                {
                    if (string.IsNullOrWhiteSpace(ProxyManager.defaultTenantId))
                    {
                        errorMessage = "No TenantId was specified with this request, and this Proxy is not configured with a default TenantId.";
                        return false;
                    }
                    else
                    {
                        if (ProxyManager.endpointByTenantId.TryGetValue(ProxyManager.defaultTenantId, out tenantEndpointCollection))
                        {
                            endpoint = tenantEndpointCollection.GetNextEndpoint(endpointType);
                            return true;
                        }
                        else
                        {
                            errorMessage = "No TenantId was specified with this request, and the default TenantId for this Proxy is misconfigured.";
                            return false;
                        }
                    }
                }
                else if (!string.IsNullOrWhiteSpace(tenantId) && !string.IsNullOrWhiteSpace(tenantName))
                {
                    errorMessage = "Do not specify BOTH TenantId and TenantName.  Only specify one of those values to avoid ambiguity.";
                    return false;
                }
                else if (!string.IsNullOrWhiteSpace(tenantId))
                {
                    if (ProxyManager.endpointByTenantId.TryGetValue(tenantId.ToLowerInvariant(), out tenantEndpointCollection))
                    {
                        endpoint = tenantEndpointCollection.GetNextEndpoint(endpointType);
                        return true;
                    }
                    else
                    {
                        errorMessage = string.Format(
                            "This Proxy is not configured to handle requests for the requested TenantId [{0}].",
                            tenantId);
                        return false;
                    }
                }
                else
                {
                    if (ProxyManager.endpointByTenantName.TryGetValue(tenantName.ToLowerInvariant(), out tenantEndpointCollection))
                    {
                        endpoint = tenantEndpointCollection.GetNextEndpoint(endpointType);
                        return true;
                    }
                    else
                    {
                        errorMessage = string.Format(
                            "This Proxy is not configured to handle requests for the requested Tenant [{0}].",
                            tenantName);
                        return false;
                    }
                }
            }
            catch (KeyNotFoundException ex)
            {
                errorMessage = ex.Message;
                return false;
            }
            finally
            {
                if (endpoint == null)
                {
                    const string ErrorMessageFormat = "{{\"code\":\"BadRequest\", \"message\":{0}}}";
                    string formattedError = string.Format(ErrorMessageFormat, JsonConvert.ToString(errorMessage));
                    errorResponse = new HttpResponseMessage(HttpStatusCode.BadRequest)
                    {
                        Content = new StringContent(formattedError, Encoding.UTF8, ProxyManager.JsonMediaType)
                    };
                }
            }
        }