#property strict

#include <Trade/Trade.mqh>
CTrade trade;

//--- object names
string BTN_NAME  = "CreateLineButton";
string LINE_NAME = "EntryLine";

//--- trend settings
input int TrendPeriod = 50;
int   ma_handle = INVALID_HANDLE;

//+------------------------------------------------------------------+
//| Expert initialization                                            |
//+------------------------------------------------------------------+
int OnInit()
{
   CreateButton();

   ma_handle = iMA(_Symbol, _Period, TrendPeriod, 0, MODE_SMA, PRICE_CLOSE);
   if(ma_handle == INVALID_HANDLE)
   {
      Print("MA handle creation failed");
      return INIT_FAILED;
   }
 
   return INIT_SUCCEEDED;
}

//+------------------------------------------------------------------+
//| Expert deinitialization                                          |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   ObjectDelete(0, BTN_NAME);
   ObjectDelete(0, LINE_NAME);
}

//+------------------------------------------------------------------+
//| Create button                                                    |
//+------------------------------------------------------------------+
void CreateButton()
{
   if(ObjectFind(0, BTN_NAME) != -1)
      return;

   if(!ObjectCreate(0, BTN_NAME, OBJ_BUTTON, 0, 0, 0))
   {
      Print("Failed to create button");
      return;
   }

   ObjectSetInteger(0, BTN_NAME, OBJPROP_XDISTANCE, 10);
   ObjectSetInteger(0, BTN_NAME, OBJPROP_YDISTANCE, 20);
   ObjectSetInteger(0, BTN_NAME, OBJPROP_XSIZE, 140);
   ObjectSetInteger(0, BTN_NAME, OBJPROP_YSIZE, 30);
   ObjectSetString(0, BTN_NAME, OBJPROP_TEXT, "Add Entry Line");
   ObjectSetInteger(0, BTN_NAME, OBJPROP_COLOR, clrWhite);
   ObjectSetInteger(0, BTN_NAME, OBJPROP_BGCOLOR, clrBlue);
   ObjectSetInteger(0, BTN_NAME, OBJPROP_BORDER_COLOR, clrBlack);
}

//+------------------------------------------------------------------+
//| Create draggable horizontal line                                 |
//+------------------------------------------------------------------+
void CreateEntryLine()
{
   if(ObjectFind(0, LINE_NAME) != -1)
      return;

   double price = SymbolInfoDouble(_Symbol, SYMBOL_BID);

   if(!ObjectCreate(0, LINE_NAME, OBJ_HLINE, 0, 0, price))
   {
      Print("Failed to create line");
      return;
   }

   ObjectSetInteger(0, LINE_NAME, OBJPROP_COLOR, clrRed);
   ObjectSetInteger(0, LINE_NAME, OBJPROP_WIDTH, 2);
   ObjectSetInteger(0, LINE_NAME, OBJPROP_SELECTABLE, true);
   ObjectSetInteger(0, LINE_NAME, OBJPROP_SELECTED, true);
}

//+------------------------------------------------------------------+
//| Chart event handler                                              |
//+------------------------------------------------------------------+
void OnChartEvent(const int id, const long &lparam, const double &dparam, const string &sparam)
{
   if(id == CHARTEVENT_OBJECT_CLICK)
   {
      Print("ChartEvent: clicked object = ", sparam);
      if(sparam == BTN_NAME)
      {
         Print("Button clicked → creating line");
         CreateEntryLine();
      }
   }
}

//+------------------------------------------------------------------+
//| Trend direction using MA                                         |
//+------------------------------------------------------------------+
int GetTrendDirection()
{
   if(ma_handle == INVALID_HANDLE)
      return 0;

   double ma_buf[1];
   if(CopyBuffer(ma_handle, 0, 0, 1, ma_buf) != 1)
      return 0;

   double ma    = ma_buf[0];
   double price = SymbolInfoDouble(_Symbol, SYMBOL_BID);

   if(price > ma) return 1;   // uptrend
   if(price < ma) return -1;  // downtrend
   return 0;
}

//+------------------------------------------------------------------+
//| OnTick: keep UI alive + trade logic                              |
//+------------------------------------------------------------------+
void OnTick()
{
   // In tester, chart can reset → ensure button exists
   if(ObjectFind(0, BTN_NAME) == -1)
      CreateButton();

   if(ObjectFind(0, LINE_NAME) == -1)
      return;

   double linePrice = ObjectGetDouble(0, LINE_NAME, OBJPROP_PRICE);
   double bid       = SymbolInfoDouble(_Symbol, SYMBOL_BID);
   double ask       = SymbolInfoDouble(_Symbol, SYMBOL_ASK);

   int trend = GetTrendDirection();
   if(trend == 0)
      return;

   if((trend == 1 && ask >= linePrice) || (trend == -1 && bid <= linePrice))
   {
      double lot = 0.1;

      if(trend == 1)
      {
         Print("Buying at line touch");
         trade.Buy(lot, _Symbol);
      }
      else
      {
         Print("Selling at line touch");
         trade.Sell(lot, _Symbol);
      }

      ObjectDelete(0, LINE_NAME);
   }
}