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#property copyright "Grok @ xAI - 2025"
#property link      "https://x.ai"
#property version   "1.00"
#property strict
#property indicator_chart_window

// Input parameters
input color   RectangleColor   = clrDarkOrange;   // Color of the high-low rectangle
input color   OpenCloseColor   = clrWhite;        // Color of Open/Close lines
input int     RectangleOpacity = 15;             // 0-255 (lower = more transparent)
input bool    ShowLabels       = true;            // Show O/H/L/C labels
input int     FontSize         = 9;

// Global variables
datetime lastBarDate = 0;

//+------------------------------------------------------------------+
int OnInit()
{
   IndicatorShortName("6 AM GMT Candle Highlighter");
   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   ObjectsDeleteAll(0, "6AM_");
}
//+------------------------------------------------------------------+
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[])
{
   datetime currentBarTime = time[rates_total-1];
   datetime currentDay     = currentBarTime - (currentBarTime % 86400); // Midnight GMT of today
   
   // We only need to recalculate once per day
   if(currentDay == lastBarDate) return(rates_total);
   lastBarDate = currentDay;
   
   // Clean previous objects
   ObjectsDeleteAll(0, "6AM_");
   
   // Find the 6 AM GMT candle
   datetime targetTime = currentDay + 6*3600;  // 6:00 AM GMT today
   
   int shift = iBarShift(NULL, 0, targetTime, true);
   if(shift == -1) return(rates_total); // Candle not formed yet (e.g., weekend)
   
   double o = Open[shift];
   double h = High[shift];
   double l = Low[shift];
   double c = Close[shift];
   datetime candleTime = Time[shift];
   datetime nextCandleTime = (iTime(NULL,0,shift-1) != 0) ? iTime(NULL,0,shift-1) : TimeCurrent()+PeriodSeconds();
   
   string namePrefix = "6AM_"+TimeToString(candleTime,TIME_DATE);
   
   // 1. High-Low Rectangle
   ObjectCreate(0, namePrefix+"_Rect", OBJ_RECTANGLE, 0, candleTime, h, nextCandleTime, l);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_COLOR, RectangleColor);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_BACK, true);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_STYLE, STYLE_SOLID);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_WIDTH, 1);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_BACK_FILL, true);
   ObjectSetInteger(0, namePrefix+"_Rect", OBJPROP_TRANSPARENCY, 255-RectangleOpacity*255/100);
   
   // 2. Open Line
   ObjectCreate(0, namePrefix+"_Open", OBJ_HLINE, 0, 0, o);
   ObjectSetInteger(0, namePrefix+"_Open", OBJPROP_COLOR, OpenCloseColor);
   ObjectSetInteger(0, namePrefix+"_Open", OBJPROP_STYLE, STYLE_DOT);
   ObjectSetInteger(0, namePrefix+"_Open", OBJPROP_WIDTH, 1);
   
   // 3. Close Line
   ObjectCreate(0, namePrefix+"_Close", OBJ_HLINE, 0, 0, c);
   ObjectSetInteger(0, namePrefix+"_Close", OBJPROP_COLOR, OpenCloseColor);
   ObjectSetInteger(0, namePrefix+"_Close", OBJPROP_STYLE, STYLE_DOT);
   ObjectSetInteger(0, namePrefix+"_Close", OBJPROP_WIDTH, 1);
   
   // 4. Labels (optional)
   if(ShowLabels)
   {
      string labelText = StringFormat("6AM GMT\nO: %.5f\nH: %.5f\nL: %.5f\nC: %.5f", o,h,l,c);
      ObjectCreate(0, namePrefix+"_Label", OBJ_TEXT, 0, candleTime + (nextCandleTime-candleTime)/2, h*1.0005);
      ObjectSetString(0, namePrefix+"_Label", OBJPROP_TEXT, labelText);
      ObjectSetInteger(0, namePrefix+"_Label", OBJPROP_COLOR, clrYellow);
      ObjectSetInteger(0, namePrefix+"_Label", OBJPROP_FONTSIZE, FontSize);
      ObjectSetString(0, namePrefix+"_Label", OBJPROP_FONT, "Arial Bold");
      ObjectSetInteger(0, namePrefix+"_Label", OBJPROP_ANCHOR, ANCHOR_TOP);
   }
   
   ChartRedraw();
   return(rates_total);
}