#property strict

#include "Channel_Unit.mqh"

#ifdef __MQL5__
  #ifndef TICKET_TYPE
    #define TICKET_TYPE long
  #endif // TICKET_TYPE
#else // __MQL5__
  #ifndef TICKET_TYPE
    #define TICKET_TYPE int
  #endif // TICKET_TYPE
#endif // __MQL5__

struct TRADECHANNEL
{
private:
  static int OrderScan( const int Type )
  {
    int Res = -1;

    for (int i = OrdersTotal() - 1; i >= 0; i--)
      if (OrderSelect(i, SELECT_BY_POS))
        if (OrderType() == Type)
        {
          Res = Type;

          break;
        }

    return(Res);
  }

  static TICKET_TYPE Trade( const int Type, const double dLots, const double Price, const int Slip = 100 )
  {
    return((TRADECHANNEL::OrderScan(Type) == Type) ? false :
           ((TRADECHANNEL::OrderScan(1 - Type) == -1) || OrderClose(OrderTicket(), OrderLots(), OrderClosePrice(), Slip)) &&
           (OrderSend(_Symbol, Type, dLots, Price, Slip, 0, 0) > 0));
  }

public:
  const double Lots;

  TRADECHANNEL( const double dLots = 1 ) : Lots(dLots)
  {
  }

  void Trade( const CHANNEL_UNIT &ChannelUnit ) const
  {
    if (ChannelUnit.Check())
    {
      MqlTick Tick;

      if (SymbolInfoTick(_Symbol, Tick))
      {
        if (Tick.bid >= ChannelUnit.High)
          TRADECHANNEL::Trade(OP_SELL, this.Lots, Tick.bid);
        else if (Tick.ask <= ChannelUnit.Low)
          TRADECHANNEL::Trade(OP_BUY, this.Lots, Tick.ask);
      }
    }

    return;
  }
};