Buy stop and Trailing stop

i want to develop a MQL4 EA, pls see the strategy below

Some other requirements

void OnTick()
  {
//---
   // Get the profit target price and the stop loss price
   double Long_TakeProfitLevel = Bid + Profit_target*Point; //0.0001
   double Long_StopLossLevel = Bid - Stop_loss*Point;
   double Short_TakeProfitLevel = Ask - Profit_target*Point; //0.0001
   double Short_StopLossLevel = Ask + Stop_loss*Point;   
   
   // Check if the long condition happen and place order accordingly
   if (Enter_long() ) //if more the one signal, could be Enter_long1, Enter long2 or Signal1, Signal2... //OrdersTotal depend on strategy
   {   
  
   Open_Enter_long(Lot_size,Long_TakeProfitLevel,Long_StopLossLevel,"First_Enter");  

   }
   else if (Exit_long())
   {
      Close_Exit_long("Close_Exit_long");
   }
   
   // Check if the short condition happen and place order accordingly
   if (Enter_short() ) //if more the one signal, could be Enter_long1, Enter long2 or Signal1, Signal2... //OrdersTotal depend on strategy
   {   
  
   Open_Enter_short(Lot_size,Short_TakeProfitLevel,Short_StopLossLevel,"First_Enter");  

   }
   else if (Exit_short())
   {
      Close_Exit_short("Close_Exit_short");
   }   
   
  }