[WebMethod]
    public string SendNotification(string strDeviceId, string strMessage)
    {
        try
        {

            //{"POPUP_FLAG":"Y","DATABASE_FLAG":"Y","MESSAGE":"gm","MESSAGE_DATE":"28-Jan-2017 12:00 AM","MESSAGE_END_DATE":"28-Jan-2017 01:00 AM","PAGE_ID":"188"}
            classAlert.AlertNotificationData objAlertNotificationData = new classAlert.AlertNotificationData();
            objAlertNotificationData = JSonScript.Deserialize<classAlert.AlertNotificationData>(strMessage);

            //---insert into tcil app notification table if database flag = Y on 13-aug-2021 by ramesh kumar
            if ((objAlertNotificationData.DATABASE_FLAG ?? "").ToString().Trim().ToUpper() == "Y")
            {
                try
                {
                    oper.Trans_Begin();
                    string strQuery = @"INSERT INTO TCIL_APP_NOTIFICATION(NOTIFICATION_ID, MESSAGE_TITLE, MESSAGE, MESSAGE_DATETIME, MESSAGE_END_DATETIME, MESSAGE_TYPE, PAGE_ID, EMP_CODE, IMEI_NO, ENTRY_USER, ENTRY_BRANCH, ENTRY_DATE, PAGE_URL) 
                 SELECT NVL((SELECT MAX(NVL(NOTIFICATION_ID,0)) NOTIFICATION_ID FROM TCIL_APP_NOTIFICATION),0)+1 NOTIFICATION_ID
                     , :Message_Title MESSAGE_TITLE, :Message MESSAGE
                     , TO_DATE(:Message_DateTime, 'DD-MON-YYYY hh:mi PM') MESSAGE_DATETIME
                     , TO_DATE(:Message_End_DateTime, 'DD-MON-YYYY hh:mi PM') MESSAGE_END_DATETIME
                     , 'HTML' MESSAGE_TYPE, :Page_ID PAGE_ID, :Device_EMP_CODE EMP_CODE, NULL IMEI_NO
                     , NVL((SELECT MAX(NVL(SCHEDULE_ID,0)) SCHEDULE_ID FROM TLOG_MOBILE_NOTIFICATION_SCH),0)+1 ENTRY_USER
                     , 'SCH' ENTRY_BRANCH, SYSDATE ENTRY_DATE, :PAGE_URL PAGE_URL
                 FROM DUAL ";
                    oper.QueryParamExec(strQuery, new OracleParameter[] {
                     new OracleParameter(":Message_Title", (objAlertNotificationData.Message_Title ?? "").ToString().Trim()),
                     new OracleParameter(":Message", (objAlertNotificationData.Message ?? "").ToString().Trim()),
                     new OracleParameter(":Message_DateTime", (objAlertNotificationData.Message_DateTime ?? "").ToString().Trim()),
                     new OracleParameter(":Message_End_DateTime", (objAlertNotificationData.Message_End_DateTime ?? "").ToString().Trim()),
                     new OracleParameter(":Page_ID", (objAlertNotificationData.Page_ID ?? "").ToString().Trim()),
                     new OracleParameter(":Device_EMP_CODE", (objAlertNotificationData.Device_EMP_CODE ?? "").ToString().Trim()),
                     new OracleParameter(":PAGE_URL", (objAlertNotificationData.Page_Url ?? "").ToString().Trim()),
                 });
                    oper.Trans_Commit();
                }
                catch (Exception)
                {
                    oper.Trans_Rollback();
                }
            }

            if (strDeviceId.ToString().Trim() == "")
            {
                string strEMP_CODE = (objAlertNotificationData.Device_EMP_CODE ?? "");
                string strDevice_ID = (objAlertNotificationData.Device_ID ?? "");
                if (strEMP_CODE.ToString().ToUpper().Trim() != "")
                {
                    string str = @"SELECT NVL(A.LAST_USAGE_DATE,SYSDATE) LAST_USAGE_DATE, NVL(A.APPROVAL_FLAG,'N') APPROVAL_FLAG, A.EMP_CODE, A.DEVICE_ID 
                             FROM CM_TCIL_MOBILE_GATEWAY A 
                             WHERE A.EMP_CODE=:EMP_CODE AND NVL(A.APPROVAL_FLAG,'N') IN('C','Y')
                             ORDER BY APPROVAL_FLAG DESC, LAST_USAGE_DATE DESC";
                    OracleParameter[] Param = new OracleParameter[] { new OracleParameter("EMP_CODE", objAlertNotificationData.Device_EMP_CODE.ToString().ToUpper().Trim()) };
                    OracleDataReader dr = oper.datadispParamExec(str, Param);
                    if (dr.Read())
                    {
                        strDeviceId = dr["DEVICE_ID"].ToString();
                    }
                    dr.Close();
                    oper.closecon();
                }
                else
                {
                    if (strDevice_ID.ToString().ToUpper().Trim() != "")
                    {
                        strDeviceId = strDevice_ID;
                    }
                    else
                    {
                        return "Failed : Device ID and Employee Code Missing !";
                    }
                }
            }
            // fcm
            // ================= FIREBASE ADMIN SDK =================

            if (FirebaseApp.DefaultInstance == null)
            {
                string jsonPath = HttpContext.Current.Server.MapPath(
                    "~/firebase-service-account.json"); //  tcil-app JSON

                if (!System.IO.File.Exists(jsonPath))
                    throw new Exception("Firebase JSON not found at: " + jsonPath);

                FirebaseApp.Create(new AppOptions
                {
                    Credential = GoogleCredential.FromFile(jsonPath)
                });
            }

            // Build FCM message
            var message = new Message
            {
                Token = strDeviceId,

                Notification = new Notification
                {
                    Title = objAlertNotificationData.Message_Title,
                    Body = objAlertNotificationData.Message
                },

                Data = new Dictionary<string, string>
              {
                  { "source", "tcil-app" },
                  { "type", "alert" },
                  { "pageId", objAlertNotificationData.Page_ID ?? "" }
              }
            };

            // Send notification
            string response = FirebaseMessaging
                                .DefaultInstance
                                .SendAsync(message)
                                .Result;

            return response;
            // =====================================================

        }
        catch (Exception ex)
        {
            return ex.Message;
        }
    }