//+------------------------------------------------------------------+
//|                                      Copyright (C) 2026, boyvlad |
//|                            https://www.mql5.com/en/users/boyvlad |
//+------------------------------------------------------------------+

//--- Do not remove!
#property tester_everytick_calculate
//---
#property indicator_chart_window
#property indicator_buffers 1
#property indicator_plots 1
//---
#property indicator_type1  DRAW_LINE
#property indicator_color1 clrOrange
#property indicator_style1 STYLE_SOLID
#property indicator_width1 2
#property indicator_label1 "Applied price"
//---
#property copyright   "Copyright (C) 2026, boyvlad"
#property link        "https://www.mql5.com/en/users/boyvlad"

input(name="Price") ENUM_APPLIED_PRICE inpAppliedPrice = PRICE_CLOSE;

double buffer[];

int OnInit()
  {
   SetIndexBuffer(0, buffer, INDICATOR_DATA);
   return INIT_SUCCEEDED;
  }

int OnCalculate(const int32_t rates_total,
                const int32_t 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 int32_t &spread[])
  {
   if(rates_total < 2 || rates_total < prev_calculated)
     {
      PrintFormat(__FUNCTION__" Something went wrong. rates_total %i, prev_calculated %i", rates_total, prev_calculated);
      return 0;
     }
   int barIdxToRecalcFrom;
   switch(rates_total - prev_calculated)
     {
      case 0:
      case 1:
         barIdxToRecalcFrom = prev_calculated - 1;
         break;
      default:
         barIdxToRecalcFrom = 0;
         break;
     }
   for(int i = barIdxToRecalcFrom; i < rates_total; i++)
      buffer[i] = calculate(i, inpAppliedPrice, open, high, low, close);
   return rates_total;
  }

double calculate(int barIdx, ENUM_APPLIED_PRICE a_mode, const double &open[], const double &high[], const double &low[], const double &close[])
  {
   switch(a_mode)
     {
      case PRICE_OPEN:     return open[barIdx];
      case PRICE_HIGH:     return high[barIdx];
      case PRICE_LOW:      return low[barIdx];
      case PRICE_MEDIAN:   return (high[barIdx] + low[barIdx]) / 2.0;
      case PRICE_TYPICAL:  return (high[barIdx] + low[barIdx] + close[barIdx]) / 3.0;
      case PRICE_WEIGHTED: return (high[barIdx] + low[barIdx] + close[barIdx] + close[barIdx]) / 4.0;
      default:             return close[barIdx];
     }
  }