public static async Task createMonthlyDeviceConsumptionItem(string device_id, DateTime period, long consuption,
                                                                    long waterReadfirstEventInTheMonth, long waterReadfirstEventInTheLastMonth, string user_id)
        {
            MonthlyDeviceConsumptionItem monthlyDeviceConsumptionItem = new MonthlyDeviceConsumptionItem()
            {
                id = $"{device_id}-{period.Month}-{period.Year}",
                consumption_sum  = consuption,
                month            = period.Month,
                year             = period.Year,
                device_id        = device_id,
                user_id          = user_id,
                first_water_read = waterReadfirstEventInTheLastMonth,
                last_water_read  = waterReadfirstEventInTheMonth
            };

            // Create an item in the container representing the bill.
            ItemResponse <MonthlyDeviceConsumptionItem> monthlyConsumptionResponse =
                await Resources.monthly_consumption_container.UpsertItemAsync <MonthlyDeviceConsumptionItem>(monthlyDeviceConsumptionItem);

            // Note that after creating the item, we can access the body of the item with the Resource property off the ItemResponse.
            Console.WriteLine("Created item in database with id: {0}\n", monthlyConsumptionResponse.Resource.id);
        }
        public static async Task <IActionResult> getUserConsumption(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "consumption_per_month/userId={userId}&year={year}")] HttpRequest request,
            [CosmosDB(
                 databaseName: "waterly_db",
                 collectionName: "waterly_devices",
                 ConnectionStringSetting = "CosmosDBConnection",
                 SqlQuery = "SELECT * FROM c WHERE c.userId = {userId}")]
            IEnumerable <DeviceItem> devices,
            string year,
            ILogger log)

        {
            Container BillsContainer       = Resources.bill_container;
            Container ConsumptionContainer = Resources.monthly_consumption_container;
            int       cur_year             = Int32.Parse(year);

            //for all year, dict for month number and dict userConsumptionPerMonthDict
            List <Dictionary <string, long> > consumptions_months_list = new List <Dictionary <string, long> >();

            for (int month_num = 1; month_num < 13; month_num++)
            {
                //for each month, dict for device id and consumption sum
                Dictionary <string, long> userConsumptionPerMonthDict = new Dictionary <string, long>();

                userConsumptionPerMonthDict.Add("Month", month_num);

                //Add avg per month
                var                     sqlQueryText  = $"SELECT TOP 1 * FROM c WHERE c.month = {month_num} AND c.year = {cur_year}";
                QueryDefinition         bills_query   = new QueryDefinition(sqlQueryText);
                FeedIterator <BillItem> bill_iterator = BillsContainer.GetItemQueryIterator <BillItem>(bills_query);


                Microsoft.Azure.Cosmos.FeedResponse <BillItem> currentResultSet;

                long avg = 0;

                while (bill_iterator.HasMoreResults)
                {
                    currentResultSet = await bill_iterator.ReadNextAsync();

                    if (currentResultSet.Count == 0)
                    {
                        break;
                    }
                    else
                    {
                        BillItem first_bill = currentResultSet.First();
                        avg  = (long)first_bill.avg;
                        avg /= 10;
                        break;
                    }
                }

                userConsumptionPerMonthDict.Add("Average", avg);

                foreach (DeviceItem device_item in devices)
                {
                    //calculate sum for month_num for device_item
                    string device_id = device_item.id;
                    sqlQueryText = $"SELECT * FROM c WHERE c.month = {month_num} AND c.year = {cur_year} AND c.device_id = '{device_id}'";
                    QueryDefinition consumption_query = new QueryDefinition(sqlQueryText);
                    FeedIterator <MonthlyDeviceConsumptionItem> consumption_iterator = ConsumptionContainer.GetItemQueryIterator <MonthlyDeviceConsumptionItem>(consumption_query);
                    long consumption_per_device_month = 0;
                    Microsoft.Azure.Cosmos.FeedResponse <MonthlyDeviceConsumptionItem> ConsumptionCurrentResultSet;


                    while (consumption_iterator.HasMoreResults)
                    {
                        ConsumptionCurrentResultSet = await consumption_iterator.ReadNextAsync();

                        if (ConsumptionCurrentResultSet.Count == 0)
                        {
                            break;
                        }
                        else
                        {
                            MonthlyDeviceConsumptionItem first_sum_item = ConsumptionCurrentResultSet.First();
                            consumption_per_device_month = first_sum_item.consumption_sum / 1000000;
                            break;
                        }
                    }


                    //add to dict
                    userConsumptionPerMonthDict.Add(device_item.name, consumption_per_device_month);
                }

                consumptions_months_list.Add(userConsumptionPerMonthDict);
            }

            return(new OkObjectResult(consumptions_months_list));
        }