//=============================================================================
//												RSI_EA.mq4
//												Originally by: Robert Hill
//												
//=============================================================================

#property copyright "Robert Hill"

#include <stdlib.mqh>
#include <stderror.mqh> 

#define LONG 1
#define SHORT -1
#define FLAT 0

extern int MagicCode = 5;
//+---------------------------------------------------+
//|Indicator inputs                                   |
//+---------------------------------------------------+
extern int     RSI_Period = 14;
extern int     RSI_UpperLevel = 53;
extern int     RSI_LowerLevel = 47;
extern int     UseRisingFallingRSI = 0;

//---- Trade Management
extern double	TakeProfit = 0;
extern double	StopLoss = 0;
extern int     StopLossGap = 1;
extern int     MinStopLoss = 100;

extern double	Lots = 1;

extern int Slippage = 3;
extern  int SignalCandle = 1;
double lotMM;

string  ExpertName="RSI_DailyEA_";


int      MagicNumber;  // Magic number of the trades. must be unique to identify
string   nameEA;             // identifies the expert
int TradesInThisSymbol;
bool YesStop;
double myPoint;
int totalTries 		= 5; 
int retryDelay 		= 1000;
int OrderErr;

//=============================================================================
// expert initialization function
//=============================================================================
int init()
{
    MagicNumber = MagicCode*1000 + func_Symbol2Val(Symbol())*100 + func_TimeFrame_Const2Val(Period());
    nameEA = ExpertName + Symbol() + "_" + func_TimeFrame_Val2String(func_TimeFrame_Const2Val(Period()));
    myPoint = SetPoint();

	return(0);
}


//=============================================================================
// expert deinitialization function
//=============================================================================
int deinit()
{
	return(0);
}


//=============================================================================
//
//								CheckSignals()
//
//	Function to tell whether or not there is a trade to place.  
//
//	RETURN VALUE:
//
//		1:	If the rules are met to place a long trade
//
//		2:	If the rules are met to place a short trade
//
//		0:	If the rules are not met
//
//=============================================================================
double GetSignal()
{
   
   double myRSI, myRSIp;
   double cci, ccip;
	
   myRSI = iRSI(Symbol(),0,RSI_Period,PRICE_CLOSE,SignalCandle);
   myRSIp = iRSI(Symbol(),0,RSI_Period,PRICE_CLOSE,SignalCandle + 1);
   

   
   if (myRSI > RSI_UpperLevel)
   {
      if (UseRisingFallingRSI == 1)
      {
         if (myRSI > myRSIp) return(LONG);
      }
      return (LONG);
   }
   
   
   if (myRSI < RSI_LowerLevel)
   {
	   if (UseRisingFallingRSI == 1)
      {
         if (myRSI < myRSIp) return(SHORT);
      }
      return(SHORT);
      
   }
   return (FLAT);
   
}
   


//=============================================================================
//
//								CheckExitSignals()
//
//
//=============================================================================
bool CheckExitSignals(int cmd)
{
   double myRSI, myRSIp;
	
   myRSI = iRSI(Symbol(),0,RSI_Period,PRICE_CLOSE,SignalCandle);

   if (cmd == OP_BUY)
   {
     if (myRSI < RSI_UpperLevel) return(true);
   }
   if (cmd == OP_SELL)
   {
     if (myRSI > RSI_LowerLevel) return(true);
   }

	return (false); // has not changed
   
}

//-- Check for Start of a new Bar
bool NewBar()
{
   static datetime dt = 0;
   
   if (Time[0] != dt)
   {
      dt = Time[0];
      return(true);
   }
   return(false);
}

//=============================================================================
// expert start function
//=============================================================================
int start()
{
	int total, PlaceTrade;
	
	total = CheckOpenTrades();
	if (total == 0) 
	{
        if (!NewBar()) return(0); // wait until first tick after bar close to take any action; 
        PlaceTrade = GetSignal();
        if (PlaceTrade != FLAT) OpenTrade(PlaceTrade);
   }
   else
   {
      RefreshRates();
      HandleOpenPositions();
   }
   return(0);
}

      
void OpenTrade( int signal)
{
   int res, err;
   double TPprice,STprice;
   int ticket;

   RefreshRates();
   
	if (signal == LONG)
	{
		res = OrderSend(Symbol(), OP_BUY, Lots, Ask, Slippage*myPoint, 0, 0, nameEA, MagicNumber, 0, Green);
		if (res > 0)
		{
			ticket = res;
			if (OrderSelect(ticket,SELECT_BY_TICKET,MODE_TRADES))
			{
				Print("BUY order opened : ", OrderOpenPrice());
            TPprice = 0;
            if (TakeProfit > 0) TPprice=TakeLong(OrderOpenPrice(), TakeProfit);
            STprice = 0;
            if (StopLoss > 0)
            {
              STprice=StopLong(OrderOpenPrice(), StopLoss);
		        STprice = ValidStopLoss(OP_BUY,OrderOpenPrice(), STprice);
		      }
		      else
		      {
		        STprice = iLow(Symbol(),0,1) - StopLossGap * myPoint;
		        if (STprice > OrderOpenPrice())
		        {
                STprice=StopLong(OrderOpenPrice(), MinStopLoss);
		        }
		        
		        STprice = ValidStopLoss(OP_BUY,OrderOpenPrice(), STprice);
		      }
		         
            
 // Normalize stoploss / takeprofit to the proper # of digits.
            if (Digits > 0) 
            {
              STprice = NormalizeDouble( STprice, Digits);
              TPprice = NormalizeDouble( TPprice, Digits); 
            }
		      ModifyOrder(ticket, OrderOpenPrice(), STprice, TPprice, LightGreen);
			}
		}
	}
		
	if (signal == SHORT)
	{
		res = OrderSend(Symbol(), OP_SELL, Lots, Bid, Slippage*myPoint, 0, 0, nameEA, MagicNumber, 0, Red);
		if (res > 0)
		{
		   ticket = res;
			if (OrderSelect(ticket, SELECT_BY_TICKET, MODE_TRADES))
			{
				Print("SELL order opened : ", OrderOpenPrice());
            TPprice = 0;
            if (TakeProfit > 0) TPprice=TakeShort(OrderOpenPrice(),TakeProfit);
            STprice = 0;
            if (StopLoss > 0)
            {
              STprice=StopShort(OrderOpenPrice() ,StopLoss);
		        STprice = ValidStopLoss(OP_SELL,OrderOpenPrice(), STprice); 
		      }
		      else
		      {
              STprice=iHigh(Symbol(), 0, 1) + StopLossGap * myPoint;
		        if (STprice < OrderOpenPrice())
		        {
                STprice=StopShort(OrderOpenPrice(), MinStopLoss);
		        }
		           STprice = ValidStopLoss(OP_SELL,OrderOpenPrice(), STprice); 
		      }
		           
 // Normalize stoploss / takeprofit to the proper # of digits.
            if (Digits > 0) 
            {
              STprice = NormalizeDouble( STprice, Digits);
              TPprice = NormalizeDouble( TPprice, Digits); 
            }
		      ModifyOrder(ticket, OrderOpenPrice(), STprice, TPprice, LightGreen);
		   }
		}
	}
   if(res<0)
   {
     err = GetLastError();
     Print("OrderSend failed with error(" + err + ") " + ErrorDescription(err));
   }
}
 
	  
void HandleOpenPositions()
{
   int cnt, err, total;
	bool CloseTrade, result = false;
   
   total = OrdersTotal();
	for (cnt=0; cnt < total; cnt++)
	{
		OrderSelect(cnt, SELECT_BY_POS, MODE_TRADES);
		
		if (OrderSymbol() != Symbol()) continue;
		if (OrderMagicNumber() != MagicNumber) continue;

		result = false;

		// Should it be closed because of a reverse signal?
		CloseTrade = CheckExitSignals(OrderType());
			// We have a long position open
		if (OrderType() == OP_BUY)
		{		  
		  if (CloseTrade == true)
		  {
			  result = OrderClose(OrderTicket(), OrderLots(), Bid, Slippage * myPoint, Violet); 
			  if (!result)
			  {
               err = GetLastError();
               Print("OrderClose BUY failed with error(" + err + ") " + ErrorDescription(err));
			  }
		  }
		}
		
		// We have a short position open
		if (OrderType() == OP_SELL)
		{				
		  if (CloseTrade == true)
		  {
			  result = OrderClose(OrderTicket(), OrderLots(), Ask, Slippage * myPoint, Violet);
			  if (!result)
			  {
               err = GetLastError();
               Print("OrderClose SELL failed with error(" + err + ") " + ErrorDescription(err));
			  }
			}
		}
	}

	return(0);
}



int ModifyOrder(int ord_ticket,double op, double oSL, double oTP, color mColor)
{
    int CloseCnt, err;
    double myStop, myTake;
    
    CloseCnt=0;
    while (CloseCnt < 3)
    {
       if (OrderModify(ord_ticket,op,oSL,oTP,0,mColor))
       {
         CloseCnt = 3;
       }
       else
       {
          err=GetLastError();
          Print(CloseCnt," Error modifying order : (", err , ") " + ErrorDescription(err));
         if (err>0) CloseCnt++;
       }
    }
}

//=============================================================================
//
//								CheckOpenTrades()
//
//	RETURN VALUE:
//
//		The number of trades this EA has currently open
//
//=============================================================================
int CheckOpenTrades()
{
	int cnt;
	int NumTrades;	// Number of buy and sell trades in this symbol
	
	NumTrades = 0;
	for (cnt=OrdersTotal()-1; cnt>=0; cnt--)
	{
		OrderSelect (cnt, SELECT_BY_POS, MODE_TRADES);
		if (OrderSymbol() != Symbol()) 
			continue;
			
		if (OrderMagicNumber() != MagicNumber)
			continue;
		
		if (OrderType() == OP_BUY)  
			NumTrades++;
			
		if (OrderType() == OP_SELL) 
			NumTrades++;
				 
	}
	return (NumTrades);
}


double SetPoint()
{
   double mPoint;
   
   if (Digits < 4)
      mPoint = 0.01;
   else
      mPoint = 0.0001;
   
   return(mPoint);
}

double StopLong(double price,int stop)
{
 if(stop==0)
  return(0);
 else
  return(price-(stop*myPoint));
}

double StopShort(double price,int stop)
{
 if(stop==0)
  return(0);
 else
  return(price+(stop*myPoint));
}

double TakeLong(double price,int take)
{
 if(take==0)
  return(0);
 else
  return(price+(take*myPoint));
}

double TakeShort(double price,int take)
{
 if(take==0)
  return(0);
 else
  return(price-(take*myPoint));
}

double ValidStopLoss(int type, double price, double SL)
{

   double minstop;
   
   if (SL < 0.1) return(SL);
   
   minstop = MarketInfo(Symbol(),MODE_STOPLEVEL);
   if (type == OP_BUY)
   {
		 if((price - SL) < minstop*myPoint) SL = price - minstop*myPoint;
   }
   if (type == OP_SELL)
   {
       if((SL-price) < minstop*myPoint)  SL = price + minstop*myPoint;  
   }

   return(SL);   
}

//+------------------------------------------------------------------+
//| Time frame interval appropriation  function                      |
//+------------------------------------------------------------------+

int func_TimeFrame_Const2Val(int Constant ) {
   switch(Constant) {
      case 1:  // M1
         return(1);
      case 5:  // M5
         return(2);
      case 15:
         return(3);
      case 30:
         return(4);
      case 60:
         return(5);
      case 240:
         return(6);
      case 1440:
         return(7);
      case 10080:
         return(8);
      case 43200:
         return(9);
   }
}

//+------------------------------------------------------------------+
//| Time frame string appropriation  function                               |
//+------------------------------------------------------------------+

string func_TimeFrame_Val2String(int Value ) {
   switch(Value) {
      case 1:  // M1
         return("M1");
      case 2:  // M1
         return("M5");
      case 3:
         return("M15");
      case 4:
         return("M30");
      case 5:
         return("H1");
      case 6:
         return("H4");
      case 7:
         return("D1");
      case 8:
         return("W1");
      case 9:
         return("MN1");
   	default: 
   		return("undefined " + Value);
   }
}

int func_Symbol2Val(string symbol) {
   string mySymbol = StringSubstr(symbol,0,6);
	if(mySymbol=="AUDCAD") return(1);
	if(mySymbol=="AUDJPY") return(2);
	if(mySymbol=="AUDNZD") return(3);
	if(mySymbol=="AUDUSD") return(4);
	if(mySymbol=="CHFJPY") return(5);
	if(mySymbol=="EURAUD") return(6);
	if(mySymbol=="EURCAD") return(7);
	if(mySymbol=="EURCHF") return(8);
	if(mySymbol=="EURGBP") return(9);
	if(mySymbol=="EURJPY") return(10);
	if(mySymbol=="EURUSD") return(11);
	if(mySymbol=="GBPCHF") return(12);
	if(mySymbol=="GBPJPY") return(13);
	if(mySymbol=="GBPUSD") return(14);
	if(mySymbol=="NZDUSD") return(15);
	if(mySymbol=="USDCAD") return(16);
	if(mySymbol=="USDCHF") return(17);
	if(mySymbol=="USDJPY") return(18);
	return(19);
}



