sequential-countdown/mql5/Indicators/SequentialCountdown/SignalAlerts.mqh

//+------------------------------------------------------------------+
//|                                                 SignalAlerts.mqh |
//|                                      Copyright 2026, Allan Niñal |
//|                                  https://www.allanninal.dev/mql5 |
//+------------------------------------------------------------------+
//| Same alert semantics as Allan's signal indicators (UT Bot,       |
//| SuperTrend): one alert per closed-bar signal (pop-up, sound,     |
//| push, e-mail), never during the history load, never twice for    |
//| the same bar, silent in the tester. A scanner watches many       |
//| symbols, so the cells that signal in the same second are sent    |
//| as ONE message (push and e-mail are rate limited).               |
//+------------------------------------------------------------------+
// SPDX-License-Identifier: LicenseRef-PolyForm-Noncommercial-1.0.0 (see LICENSE)
#property strict

#include <ChartKit/CkDebug.mqh>

input group "Alerts"
input bool   InpAlertPopup = true;          // Pop-up alert
input bool   InpAlertSound = false;         // Play a sound
input string InpSoundFile  = "alert.wav";   // Sound file (terminal Sounds folder)
input bool   InpAlertPush  = true;          // Push notification (set up MetaQuotes ID in Options)
input bool   InpAlertEmail = false;         // E-mail (set up in Options)

//--- send one message to every channel that is switched on
void SignalAlertMessage(const string product,const string msg)
  {
   if(msg=="")
      return;
   if(MQLInfoInteger(MQL_TESTER))
     {
      CkDbg("alert not sent in the Strategy Tester: "+msg);
      return;
     }
   string text=product+": "+msg;
   CkDbg("alert: "+msg);
   if(InpAlertPopup)
      Alert(text);
   if(InpAlertSound && InpSoundFile!="")
      PlaySound(InpSoundFile);
   if(InpAlertPush)
     {
      if(!TerminalInfoInteger(TERMINAL_NOTIFICATIONS_ENABLED))
         CkDbg("push not sent: notifications are off in Options");
      else
         if(!SendNotification(StringSubstr(text,0,255)))
            CkDbg("push failed, error "+IntegerToString(GetLastError()));
     }
   if(InpAlertEmail)
     {
      if(!TerminalInfoInteger(TERMINAL_EMAIL_ENABLED))
         CkDbg("e-mail not sent: e-mail is off in Options");
      else
         if(!SendMail(product,text))
            CkDbg("e-mail failed, error "+IntegerToString(GetLastError()));
     }
  }

//--- Object budget: an indicator that draws labels or lines keeps at most OBJ_CAP of them. Past that, the oldest
//--- are deleted as new ones are made, so a 20000-bar history cannot make the chart crawl. Buffers are not affected.
#define OBJ_CAP 2500
string g_objq[];
int    g_objn=0,g_objh=0;
void ObjBudgetReset(void)
  {
   g_objn=0;
   g_objh=0;
  }
void ObjBudget(const string name)
  {
   if(ArraySize(g_objq)!=OBJ_CAP)
      ArrayResize(g_objq,OBJ_CAP);
   if(g_objn<OBJ_CAP)
     {
      g_objq[(g_objh+g_objn)%OBJ_CAP]=name;
      g_objn++;
      return;
     }
   ObjectDelete(0,g_objq[g_objh]);
   g_objq[g_objh]=name;
   g_objh=(g_objh+1)%OBJ_CAP;
  }
//+------------------------------------------------------------------+