//+------------------------------------------------------------------+
//| SMC_FVG_Liquidity_EA.mq5                                        |
//+------------------------------------------------------------------+
#property strict
input double RiskPct = 0.5;       // % riesgo por trade
input ENUM_TIMEFRAMES HTF = PERIOD_H1;  // Marco para bias
input ENUM_TIMEFRAMES LTF = PERIOD_M5;  // Marco para FVG/entrada
input int FVGLookback = 100;      // Velas a escanear LTF
input int StopBufferPoints = 30;  // Colchón extra para SL
input bool AllowLong  = true;
input bool AllowShort = true;

// --- utilidades
double GetAccountRiskValue(){ return(AccountInfoDouble(ACCOUNT_BALANCE) * RiskPct/100.0); }
double PipToPoints(double pips){ return(pips * (_Point==0.00001 || _Point==0.001 ? 10 : 1)); }

// --- bias HTF simple (puedes mejorar con BOS/CHoCH)
int BiasHTF() {
   // 1 = alcista, -1 = bajista, 0 = neutro
   MqlRates r[]; if(!CopyRates(_Symbol, HTF, 0, 200, r)) return 0;
   if(r[1].close > r[1].open && r[2].close > r[2].open) return 1;
   if(r[1].close < r[1].open && r[2].close < r[2].open) return -1;
   return 0;
}

// --- detección básica de FVG (tres velas): gap entre vela1.high y vela3.low (ventas) o vela1.low y vela3.high (compras)
bool FindFVG(int direction, double &fvgTop, double &fvgBottom){
   MqlRates c[]; if(!CopyRates(_Symbol, LTF, 0, FVGLookback, c)) return false;
   ArraySetAsSeries(c,true);
   for(int i=2; i<FVGLookback; i++){
      double prevHigh = c[i].high, prevLow = c[i].low;
      double midHigh  = c[i-1].high, midLow = c[i-1].low;
      double nextHigh = c[i-2].high, nextLow = c[i-2].low;

      if(direction<0){ // short: hueco bajista (prevHigh < nextLow)
         if(prevHigh < nextLow){
            fvgTop = nextLow; fvgBottom = prevHigh; return true;
         }
      } else if(direction>0){ // long: hueco alcista (prevLow > nextHigh)
         if(prevLow > nextHigh){
            fvgTop = prevLow; fvgBottom = nextHigh; return true;
         }
      }
   }
   return false;
}

// --- barrida simple: rompe el máximo/mínimo previo reciente y regresa
bool LiquiditySweep(int direction){
   MqlRates c[]; if(!CopyRates(_Symbol, LTF, 0, 50, c)) return false;
   ArraySetAsSeries(c,true);
   double recentHigh = c[10].high, recentLow = c[10].low;
   for(int i=1;i<=10;i++){ recentHigh = MathMax(recentHigh, c[i].high); recentLow = MathMin(recentLow, c[i].low); }
   if(direction<0){ // short: barrió arriba y vuelve debajo
      return (iHigh(_Symbol,LTF,1) > recentHigh && Close[0] < recentHigh);
   } else if(direction>0){ // long: barrió abajo y vuelve encima
      return (iLow(_Symbol,LTF,1) < recentLow && Close[0] > recentLow);
   }
   return false;
}

// --- tamaño de lote por SL en puntos
double CalcLotBySL(double slPrice){
   double risk = GetAccountRiskValue();
   double slPoints = MathAbs((slPrice - SymbolInfoDouble(_Symbol,SYMBOL_BID))/_Point);
   double tickValue = SymbolInfoDouble(_Symbol,SYMBOL_TRADE_TICK_VALUE);
   double tickSize  = SymbolInfoDouble(_Symbol,SYMBOL_TRADE_TICK_SIZE);
   if(slPoints<=0 || tickValue<=0 || tickSize<=0) return 0.0;
   double valuePerPointPerLot = tickValue / (tickSize/_Point);
   double lot = risk / (slPoints * valuePerPointPerLot);
   double minLot = SymbolInfoDouble(_Symbol,SYMBOL_VOLUME_MIN);
   double step   = SymbolInfoDouble(_Symbol,SYMBOL_VOLUME_STEP);
   // normaliza
   lot = MathMax(minLot, MathFloor(lot/step)*step);
   return lot;
}

// --- ejecución
void TryEntry(){
   int bias = BiasHTF(); if(bias==0) return;

   double fvgTop, fvgBottom;
   if(!FindFVG(bias, fvgTop, fvgBottom)) return;
   if(!LiquiditySweep(bias)) return;

   // definimos precio de entrada en el borde del FVG
   double ask = SymbolInfoDouble(_Symbol,SYMBOL_ASK);
   double bid = SymbolInfoDouble(_Symbol,SYMBOL_BID);

   if(bias<0 && AllowShort){
      double entry = fvgBottom; // vender en rebote al borde inferior del FVG bajista
      double sl    = fvgTop + StopBufferPoints*_Point;
      double lot   = CalcLotBySL(sl);
      if(lot>0 && bid>=entry){ // condición simple, podrías usar órdenes pendientes
         trade.Sell(lot,_Symbol,bid,sl,0,"SMC short");
      }
   }
   if(bias>0 && AllowLong){
      double entry = fvgTop; // comprar en rebote al borde superior del FVG alcista
      double sl    = fvgBottom - StopBufferPoints*_Point;
      double lot   = CalcLotBySL(sl);
      if(lot>0 && ask<=entry){
         trade.Buy(lot,_Symbol,ask,sl,0,"SMC long");
      }
   }
}

#include <Trade/Trade.mqh>
CTrade trade;

int OnInit(){ return(INIT_SUCCEEDED); }
void OnTick(){ TryEntry(); }