//+------------------------------------------------------------------+
//|                                            TrendConfirmation.mq5 |
//|                        Copyright 2021, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2021, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property indicator_separate_window
#property indicator_buffers 5
#property indicator_plots   4

// MACDline
#property indicator_label1  "MACDline"
#property indicator_type1   DRAW_LINE
#property indicator_color1  Green
#property indicator_style1  STYLE_SOLID
#property indicator_width1  1

//signalLine
#property indicator_label2  "Signalline"
#property indicator_type2   DRAW_LINE
#property indicator_color2  Red
#property indicator_style2  STYLE_SOLID
#property indicator_width2  1

//histogram
#property indicator_label4  "Histogram"
#property indicator_type4   DRAW_COLOR_HISTOGRAM
#property indicator_color4  clrOrange,clrGreen,clrRed
#property indicator_style4  STYLE_SOLID
#property indicator_width4  1

//--- input parameters
input int      FMA=12;
input int      SMA=26;
input int      SIGNAL=9;
input double   CONFIRMATION_UMBRAL=10;

//--- indicator buffers
double         MACDlineBuffer[];
double         signallineBuffer[];
double         histogramBuffer[];
double         trendConfirmationBuffer[];
double         histogramColors[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit() {
   SetIndexBuffer(0,MACDlineBuffer,INDICATOR_DATA);
   SetIndexBuffer(1,signallineBuffer,INDICATOR_DATA);
   SetIndexBuffer(2,trendConfirmationBuffer,INDICATOR_DATA);
   SetIndexBuffer(3,histogramBuffer,INDICATOR_DATA);
   SetIndexBuffer(4,histogramColors,INDICATOR_COLOR_INDEX);

   PlotIndexSetInteger(0,PLOT_DRAW_TYPE,DRAW_NONE);
   PlotIndexSetInteger(1,PLOT_DRAW_TYPE,DRAW_NONE);
//PlotIndexSetInteger(4,PLOT_DRAW_TYPE,DRAW_NONE);

   return(INIT_SUCCEEDED);
}
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int OnCalculate(const int ratesTotal, const int prevCalculated, const int begin, const double &price[]) {

   int MACDhadling=iMACD(NULL,0,FMA,SMA,SIGNAL,PRICE_CLOSE);
   CopyBuffer(MACDhadling,0,0,ratesTotal,MACDlineBuffer);
   CopyBuffer(MACDhadling,1,0,ratesTotal,signallineBuffer);

   for(int i=0; i<ratesTotal; i++) {
      int trendDirection=getTrendDirection(i);
      trendConfirmationBuffer[i]=trendDirection;
      if(trendDirection==2||trendDirection==0) {
         histogramColors[i]=0;
      }
      if(trendDirection==-1) {
         histogramColors[i]=2;
      }
      if(trendDirection==1) {
         histogramColors[i]=1;
      }
   }
   return(ratesTotal);
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int getTrendDirection(int position) {
   int direction=2;
   histogramBuffer[position]=MACDlineBuffer[position]-signallineBuffer[position];
   if(histogramBuffer[position] <= CONFIRMATION_UMBRAL && histogramBuffer[position] >= -CONFIRMATION_UMBRAL) {
      return 2;
   }
   if(position>1) {
      if(isValidDownTrend(position)&& isValidDownTrend(position-1))  return -1;
      if(isValidUpTrend(position)&& isValidUpTrend(position-1)) return 1;
      if((closeUpTrend(position)&& closeUpTrend(position-1))||(closeDownTrend(position)&&closeDownTrend(position-1))) return 0;
   }
   return direction;
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int isValidDownTrend(int position) {
   histogramBuffer[position]=MACDlineBuffer[position]-signallineBuffer[position];
   if(histogramBuffer[position] < histogramBuffer[position-1] && histogramBuffer[position] < histogramBuffer[position-2] && histogramBuffer[position-1] < histogramBuffer[position-2]) {
      return true;
   } else {
      return false;
   }
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int isValidUpTrend(int position) {
   histogramBuffer[position]=MACDlineBuffer[position]-signallineBuffer[position];
   if(histogramBuffer[position] >= histogramBuffer[position-1] && histogramBuffer[position] >= histogramBuffer[position-2]&& histogramBuffer[position-1] >= histogramBuffer[position-2]) {
      return true;
   } else {
      return false;
   }
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int closeUpTrend(int position) {
   histogramBuffer[position]=MACDlineBuffer[position]-signallineBuffer[position];
   if(histogramBuffer[position]<= histogramBuffer[position-1] && histogramBuffer[position-1] <= histogramBuffer[position-2]) {
      return true;
   }
   return false;
}

//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int closeDownTrend(int position) {
   histogramBuffer[position]=MACDlineBuffer[position]-signallineBuffer[position];
   if(histogramBuffer[position] > histogramBuffer[position-1]&& histogramBuffer[position-1] > histogramBuffer[position-2]) {
      return true;
   }
   return false;
}

//+------------------------------------------------------------------+

//+------------------------------------------------------------------+