//+------------------------------------------------------------------+
//| SMC Liquidity + BOS + Retest Bot |
//+------------------------------------------------------------------+
#property strict

// === INPUTS (EDIT THESE) ===
input ENUM_TIMEFRAMES lowerTF = PERIOD_M15;
input ENUM_TIMEFRAMES higherTF = PERIOD_H1;

input double lotSize = 0.1;
input int stopLossPips = 20;
input int takeProfitPips = 40;

input int lookback = 10; // candles to detect highs/lows
input double retestBuffer = 5; // points tolerance for retest

// === GLOBAL VARIABLES ===
double lastHigh, lastLow;
bool sweepDetected = false;
bool bosDetected = false;
double bosLevel = 0;

//+------------------------------------------------------------------+
//| Get Highest High |
//+------------------------------------------------------------------+
double GetRecentHigh(ENUM_TIMEFRAMES tf)
{
int index = iHighest(_Symbol, tf, MODE_HIGH, lookback, 1);
return iHigh(_Symbol, tf, index);
}

//+------------------------------------------------------------------+
//| Get Lowest Low |
//+------------------------------------------------------------------+
double GetRecentLow(ENUM_TIMEFRAMES tf)
{
int index = iLowest(_Symbol, tf, MODE_LOW, lookback, 1);
return iLow(_Symbol, tf, index);
}

//+------------------------------------------------------------------+
//| Detect Liquidity Sweep |
//+------------------------------------------------------------------+
bool DetectLiquiditySweep()
{
double prevLow = GetRecentLow(lowerTF);
double currentLow = iLow(_Symbol, lowerTF, 0);

// Sweep below lows (Buy setup)
if(currentLow < prevLow)
{
lastLow = prevLow;
return true;
}

double prevHigh = GetRecentHigh(lowerTF);
double currentHigh = iHigh(_Symbol, lowerTF, 0);

// Sweep above highs (Sell setup)
if(currentHigh > prevHigh)
{
lastHigh = prevHigh;
return true;
}

return false;
}

//+------------------------------------------------------------------+
//| Detect Market Structure Break (BOS) |
//+------------------------------------------------------------------+
bool DetectBOS()
{
double high = GetRecentHigh(higherTF);
double low = GetRecentLow(higherTF);
double close = iClose(_Symbol, higherTF, 0);

// Bullish BOS
if(close > high)
{
bosLevel = high;
return true;
}

// Bearish BOS
if(close < low)
{
bosLevel = low;
return true;
}

return false;
}

//+------------------------------------------------------------------+
//| Check Retest Entry |
//+------------------------------------------------------------------+
bool CheckRetest()
{
double price = SymbolInfoDouble(_Symbol, SYMBOL_BID);

if(MathAbs(price - bosLevel) <= retestBuffer * _Point)
return true;

return false;
}

//+------------------------------------------------------------------+
//| Execute Trade |
//+------------------------------------------------------------------+
void ExecuteTrade(bool isBuy)
{
double sl, tp, price;

if(isBuy)
{
price = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
sl = price - stopLossPips * _Point;
tp = price + takeProfitPips * _Point;
}
else
{
price = SymbolInfoDouble(_Symbol, SYMBOL_BID);
sl = price + stopLossPips * _Point;
tp = price - takeProfitPips * _Point;
}

MqlTradeRequest request;
MqlTradeResult result;

ZeroMemory(request);
ZeroMemory(result);

request.action = TRADE_ACTION_DEAL;
request.symbol = _Symbol;
request.volume = lotSize;
request.type = isBuy ? ORDER_TYPE_BUY : ORDER_TYPE_SELL;
request.price = price;
request.sl = sl;
request.tp = tp;
request.deviation = 10;
request.magic = 123456;
request.comment = "SMC Bot";

OrderSend(request, result);
}

//+------------------------------------------------------------------+
//| Main Tick Function |
//+------------------------------------------------------------------+
void OnTick()
{
// Step 1: Detect Liquidity Sweep
if(!sweepDetected)
{
sweepDetected = DetectLiquiditySweep();
return;
}

// Step 2: Confirm BOS
if(sweepDetected && !bosDetected)
{
bosDetected = DetectBOS();
return;
}

// Step 3: Wait for Retest
if(sweepDetected && bosDetected)
{
if(CheckRetest())
{
bool isBuy = (iClose(_Symbol, higherTF, 0) > bosLevel);
ExecuteTrade(isBuy);

// Reset after trade
sweepDetected = false;
bosDetected = false;
}
}
}