//+------------------------------------------------------------------+
//|                                                          EA1.mq5 |
//|                                    SMA 12/26 Crossover Strategy  |
//|                                          Timeframe: M15          |
//|                                    TP: 1000 pips | SL: 500 pips  |
//+------------------------------------------------------------------+
#property copyright "EA1"
#property version   "1.00"
#property strict

#include <Trade\Trade.mqh>

//--- Input Parameters
input int    FastPeriod  = 12;        // Fast SMA Period
input int    SlowPeriod  = 26;        // Slow SMA Period
input double LotSize     = 0.1;       // Trade Lot Size
input int    TakeProfitPips = 1000;   // Take Profit in Pips
input int    StopLossPips   = 500;    // Stop Loss in Pips
input double PipSize     = 0.0001;    // Pip Size (0.0001 for FX, 0.01 for JPY pairs)
input int    MagicNumber = 112600;    // Magic Number

//--- Global Variables
CTrade trade;
int    fastHandle;
int    slowHandle;
datetime lastBarTime = 0;

//+------------------------------------------------------------------+
//| Expert initialization function                                   |
//+------------------------------------------------------------------+
int OnInit()
  {
   // Validate inputs
   if(FastPeriod >= SlowPeriod)
     {
      Print("ERROR: FastPeriod must be less than SlowPeriod.");
      return INIT_PARAMETERS_INCORRECT;
     }

   // Create SMA indicator handles on M15 timeframe
   fastHandle = iMA(_Symbol, PERIOD_M15, FastPeriod, 0, MODE_SMA, PRICE_CLOSE);
   slowHandle = iMA(_Symbol, PERIOD_M15, SlowPeriod, 0, MODE_SMA, PRICE_CLOSE);

   if(fastHandle == INVALID_HANDLE || slowHandle == INVALID_HANDLE)
     {
      Print("ERROR: Failed to create MA indicator handles.");
      return INIT_FAILED;
     }

   trade.SetExpertMagicNumber(MagicNumber);
   trade.SetDeviationInPoints(10);

   Print("EA1 initialized | Symbol: ", _Symbol,
         " | FastSMA: ", FastPeriod,
         " | SlowSMA: ", SlowPeriod,
         " | TP: ", TakeProfitPips, " pips",
         " | SL: ", StopLossPips, " pips");

   return INIT_SUCCEEDED;
  }

//+------------------------------------------------------------------+
//| Expert deinitialization function                                 |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
  {
   if(fastHandle != INVALID_HANDLE) IndicatorRelease(fastHandle);
   if(slowHandle != INVALID_HANDLE) IndicatorRelease(slowHandle);
   Print("EA1 deinitialized.");
  }

//+------------------------------------------------------------------+
//| Expert tick function                                             |
//+------------------------------------------------------------------+
void OnTick()
  {
   // Only process logic on a new M15 bar
   datetime currentBarTime = iTime(_Symbol, PERIOD_M15, 0);
   if(currentBarTime == lastBarTime)
      return;
   lastBarTime = currentBarTime;

   // Get crossover signal from closed bars [1] and [2]
   int signal = CheckCrossover();
   if(signal == 0)
      return;

   // Close any opposite open position before opening a new trade
   CloseOppositePosition(signal);

   // Avoid opening a duplicate position in the same direction
   if(HasOpenPosition(signal))
      return;

   // Calculate SL and TP in price
   double tpDistance = TakeProfitPips * PipSize;
   double slDistance = StopLossPips  * PipSize;

   double ask = SymbolInfoDouble(_Symbol, SYMBOL_ASK);
   double bid = SymbolInfoDouble(_Symbol, SYMBOL_BID);

   if(signal == 1) // BUY signal — SMA12 crossed above SMA26
     {
      double sl = NormalizeDouble(ask - slDistance, _Digits);
      double tp = NormalizeDouble(ask + tpDistance, _Digits);
      if(trade.Buy(LotSize, _Symbol, ask, sl, tp, "SMA CrossUp"))
         Print("BUY opened | Ask: ", ask, " | SL: ", sl, " | TP: ", tp);
      else
         Print("BUY failed | Error: ", GetLastError());
     }
   else if(signal == -1) // SELL signal — SMA12 crossed below SMA26
     {
      double sl = NormalizeDouble(bid + slDistance, _Digits);
      double tp = NormalizeDouble(bid - tpDistance, _Digits);
      if(trade.Sell(LotSize, _Symbol, bid, sl, tp, "SMA CrossDown"))
         Print("SELL opened | Bid: ", bid, " | SL: ", sl, " | TP: ", tp);
      else
         Print("SELL failed | Error: ", GetLastError());
     }
  }

//+------------------------------------------------------------------+
//| Check for SMA crossover on the last two closed bars              |
//| Returns:  1 = Bullish cross (SMA12 crosses ABOVE SMA26)          |
//|          -1 = Bearish cross (SMA12 crosses BELOW SMA26)          |
//|           0 = No crossover                                       |
//+------------------------------------------------------------------+
int CheckCrossover()
  {
   double fastCurrent[1], fastPrev[1];
   double slowCurrent[1], slowPrev[1];

   // Copy values for bar [1] (last closed bar) and bar [2] (bar before that)
   if(CopyBuffer(fastHandle, 0, 1, 1, fastCurrent) < 1) return 0;
   if(CopyBuffer(fastHandle, 0, 2, 1, fastPrev)    < 1) return 0;
   if(CopyBuffer(slowHandle, 0, 1, 1, slowCurrent) < 1) return 0;
   if(CopyBuffer(slowHandle, 0, 2, 1, slowPrev)    < 1) return 0;

   bool bullishCross = (fastPrev[0] <= slowPrev[0]) && (fastCurrent[0] > slowCurrent[0]);
   bool bearishCross = (fastPrev[0] >= slowPrev[0]) && (fastCurrent[0] < slowCurrent[0]);

   if(bullishCross) return  1;
   if(bearishCross) return -1;
   return 0;
  }

//+------------------------------------------------------------------+
//| Close any open position opposite to the new signal               |
//+------------------------------------------------------------------+
void CloseOppositePosition(int signal)
  {
   for(int i = PositionsTotal() - 1; i >= 0; i--)
     {
      ulong ticket = PositionGetTicket(i);
      if(ticket == 0) continue;
      if(PositionGetString(POSITION_SYMBOL) != _Symbol)    continue;
      if(PositionGetInteger(POSITION_MAGIC) != MagicNumber) continue;

      long posType = PositionGetInteger(POSITION_TYPE);

      // Close BUY position on a SELL signal, or SELL position on a BUY signal
      if((signal == -1 && posType == POSITION_TYPE_BUY) ||
         (signal ==  1 && posType == POSITION_TYPE_SELL))
        {
         if(trade.PositionClose(ticket))
            Print("Position closed | Ticket: ", ticket);
         else
            Print("Close failed | Ticket: ", ticket, " | Error: ", GetLastError());
        }
     }
  }

//+------------------------------------------------------------------+
//| Check if there is already an open position in the signal direction|
//+------------------------------------------------------------------+
bool HasOpenPosition(int signal)
  {
   for(int i = 0; i < PositionsTotal(); i++)
     {
      ulong ticket = PositionGetTicket(i);
      if(ticket == 0) continue;
      if(PositionGetString(POSITION_SYMBOL) != _Symbol)    continue;
      if(PositionGetInteger(POSITION_MAGIC) != MagicNumber) continue;

      long posType = PositionGetInteger(POSITION_TYPE);
      if(signal ==  1 && posType == POSITION_TYPE_BUY)  return true;
      if(signal == -1 && posType == POSITION_TYPE_SELL) return true;
     }
   return false;
  }
//+------------------------------------------------------------------+