#property copyright "Copyright 2020"
#property link      "  "
#property version   "1.00"
#property strict
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 clrMagenta
#property indicator_color2 clrMagenta

input int      UpArrowCode          = 233;            // Up Arrow Code 
input int      DnArrowCode          = 234;            // Down Arrow Code 
input int      ArrowsWidth          = 0;              // Arrows Width

input bool     INP_Popup_Alert      = true;           //Popup Alert
input bool     INP_Email_Alert      = false;          //Email Alert
input bool     INP_Push_Alert       = false;          //Push Alert

double Up[];
double Down[];
datetime AlertTime=0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   IndicatorBuffers(2);
   SetIndexBuffer(0,Up);   SetIndexStyle(0,DRAW_ARROW,1,ArrowsWidth); SetIndexArrow(0,UpArrowCode);
   SetIndexBuffer(1,Down); SetIndexStyle(1,DRAW_ARROW,1,ArrowsWidth); SetIndexArrow(1,DnArrowCode);
   
//---
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
 
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int rates_total,
                const int prev_calculated,
                const datetime &time[],
                const double &open[],
                const double &high[],
                const double &low[],
                const double &close[],
                const long &tick_volume[],
                const long &volume[],
                const int &spread[])
  {
//---
   int limit= rates_total-prev_calculated;
   limit = MathMin(limit,rates_total-10);
   
   for(int i=limit;i>0;i--)
     {
   
   
    if(Open[i+3]>Close[i+1]&& Open[i+2]>Close[i+1]&& Open[i]>Close[i]&& Open[i]==Close[i+1] )  
        {Down[i]=High[i]+iATR(Symbol(),0,Period(),i)/2.0;}
  
     if(Open[i+3]<Close[i+1]&&Open[i+2]<Close[i+1]&& Open[i]<Close[i]&& Open[i]==Close[i+1] )   
             {Up[i]=Low[i]-iATR(Symbol(),0,Period(),i)/2.0; }  
      
 
  
//--- Buy Alert
      if(Up[1]!= EMPTY_VALUE && AlertTime!=Time[0])
        {
         AlertTime=Time[0];
         SendAlert(StringConcatenate("Buy Signal On | ",Symbol()," | ",TF_Str()," | ",Time[0]));
        }  
//--- Sell Alert
      if(Down[1]!= EMPTY_VALUE && AlertTime!=Time[0])
        {
         AlertTime=Time[0];
         SendAlert(StringConcatenate("Sell Signal On | ",Symbol()," | ",TF_Str()," | ",Time[0]));
        }
     }
  return(0); 
 }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void SendAlert(string msg)
  {
   if(INP_Popup_Alert)  Alert(msg);
   if(INP_Email_Alert)  SendMail("Alert",msg);
   if(INP_Push_Alert)   SendNotification(msg);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
string TF_Str()
  {
   int tf = Period();
   if(tf >= 43200)      return("MN");
   if(tf >= 10080)      return("W1");
   if(tf >=  1440)      return("D1");
   if(tf >=   240)      return("H4");
   if(tf >=    60)      return("H1");
   if(tf >=    30)      return("M30");
   if(tf >=    15)      return("M15");
   if(tf >=     5)      return("M5");
   if(tf >=     1)      return("M1");
   return("");
  }
//+------------------------------------------------------------------+