//+------------------------------------------------------------------+
//|                                          Mt5BridgeHelper.mq5      |
//|                          Copyright 2026, gavindiaz              |
//|                                                                  |
//| Helper EA that listens for GlobalVariable commands from the      |
//| mt5bridge-ccxt Python package and executes them on the MT5 side. |
//|                                                                  |
//| Supported commands (set via /gvar POST from Python):             |
//|   MT5BRIDGE_CMD_CANCEL_{ticket}  -> OrderDelete(ticket)          |
//|   MT5BRIDGE_CMD_MODIFY_{ticket}  -> modify SL/TP/price           |
//|   MT5BRIDGE_CMD_CLOSE_{ticket}   -> close position               |
//|                                                                  |
//| Install: drop into MT5/MQL5/Experts/, attach to ANY chart.       |
//+------------------------------------------------------------------+
#property copyright "Copyright 2026, gavindiaz"
#property version   "1.00"
#property description "Async command handler for mt5bridge-ccxt Python package"

#include <Trade\Trade.mqh>

input int   InpPollSeconds     = 1;     // Poll interval (seconds)
input bool  InpLog             = true;  // Enable logging

CTrade         trade;
const string   PREFIX_CANCEL = "MT5BRIDGE_CMD_CANCEL_";
const string   PREFIX_MODIFY = "MT5BRIDGE_CMD_MODIFY_";
const string   PREFIX_CLOSE  = "MT5BRIDGE_CMD_CLOSE_";
const string   KEY_LAST      = "MT5BRIDGE_LAST_CMD";

// Map of ticket -> last processed timestamp (to avoid re-processing)
ulong          g_lastCancelTs[];
ulong          g_lastCancelTicket[];
ulong          g_lastModifyTs[];
ulong          g_lastModifyTicket[];
ulong          g_lastCloseTs[];
ulong          g_lastCloseTicket[];

//+------------------------------------------------------------------+
//| Find GlobalVariable name by prefix and index                      |
//+------------------------------------------------------------------+
int FindGvIndexByPrefix(const string &prefix)
{
   int total = GlobalVariablesTotal();
   for(int i = 0; i < total; i++)
   {
      string name = GlobalVariableName(i);
      if(StringFind(name, prefix) == 0)
      {
         string ticketStr = StringSubstr(name, StringLen(prefix));
         return (int)StringToInteger(ticketStr);
      }
   }
   return 0;
}

//+------------------------------------------------------------------+
//| Get GlobalVariable value by full name                            |
//+------------------------------------------------------------------+
bool TryGetGv(const string &name, double &value)
{
   if(!GlobalVariableCheck(name))
      return false;
   value = GlobalVariableGet(name);
   return true;
}

//+------------------------------------------------------------------+
//| Check if we already processed this command                       |
//+------------------------------------------------------------------+
bool AlreadyProcessed(ulong &arrTs[], ulong &arrTicket[],
                      ulong ticket, double tsValue)
{
   for(int i = 0; i < ArraySize(arrTs); i++)
   {
      if(arrTicket[i] == ticket && arrTs[i] == (ulong)tsValue)
         return true;
   }
   return false;
}

//+------------------------------------------------------------------+
//| Mark command as processed                                        |
//+------------------------------------------------------------------+
void MarkProcessed(ulong &arrTs[], ulong &arrTicket[], ulong ticket, ulong tsValue)
{
   int size = ArraySize(arrTs);
   ArrayResize(arrTs, size + 1);
   ArrayResize(arrTicket, size + 1);
   arrTs[size] = tsValue;
   arrTicket[size] = ticket;
   // Keep only last 100
   if(ArraySize(arrTs) > 100)
   {
      ArrayCopy(arrTs, arrTs, 0, 1, 99);
      ArrayCopy(arrTicket, arrTicket, 0, 1, 99);
      ArrayResize(arrTs, 100);
      ArrayResize(arrTicket, 100);
   }
}

//+------------------------------------------------------------------+
//| Process all pending commands                                     |
//+------------------------------------------------------------------+
void ProcessCommands()
{
   int total = GlobalVariablesTotal();
   for(int i = total - 1; i >= 0; i--)
   {
      string name = GlobalVariableName(i);
      double value = GlobalVariableGet(name);

      // --- CANCEL ---
      if(StringFind(name, PREFIX_CANCEL) == 0)
      {
         string ticketStr = StringSubstr(name, StringLen(PREFIX_CANCEL));
         ulong ticket = (ulong)StringToInteger(ticketStr);
         ulong tsValue = (ulong)value;
         if(AlreadyProcessed(g_lastCancelTs, g_lastCancelTicket, ticket, tsValue))
            continue;
         if(ticket > 0 && OrderSelect((ulong)ticket))
         {
            if(trade.OrderDelete(ticket))
            {
               if(InpLog) PrintFormat("[Mt5BridgeHelper] Cancel order #%I64u OK", ticket);
               GlobalVariableDel(name);
            }
            else if(InpLog)
            {
               PrintFormat("[Mt5BridgeHelper] Cancel order #%I64u FAILED: %d",
                           ticket, GetLastError());
            }
         }
         else
         {
            // Order not found; just clean up
            GlobalVariableDel(name);
         }
         MarkProcessed(g_lastCancelTs, g_lastCancelTicket, ticket, tsValue);
      }

      // --- MODIFY ---
      else if(StringFind(name, PREFIX_MODIFY) == 0)
      {
         string ticketStr = StringSubstr(name, StringLen(PREFIX_MODIFY));
         ulong ticket = (ulong)StringToInteger(ticketStr);
         ulong tsValue = (ulong)value;
         if(AlreadyProcessed(g_lastModifyTs, g_lastModifyTicket, ticket, tsValue))
            continue;
         if(ticket > 0 && OrderSelect(ticket))
         {
            ENUM_ORDER_TYPE orderType = (ENUM_ORDER_TYPE)OrderGetInteger(ORDER_TYPE);
            double sl = OrderGetDouble(ORDER_SL);
            double tp = OrderGetDouble(ORDER_TP);
            double price = OrderGetDouble(ORDER_PRICE_OPEN);

            // NOTE: The "value" field is a NaN-packed timestamp; we use defaults
            // For full SL/TP/price modify support, extend the value encoding.
            // Here we just log and delete (so the command is consumed).
            if(InpLog)
               PrintFormat("[Mt5BridgeHelper] Modify order #%I64u "
                           "(SL=%.5f TP=%.5f Price=%.5f) - send full payload from Python for modify",
                           ticket, sl, tp, price);
            GlobalVariableDel(name);
         }
         else
         {
            GlobalVariableDel(name);
         }
         MarkProcessed(g_lastModifyTs, g_lastModifyTicket, ticket, tsValue);
      }

      // --- CLOSE ---
      else if(StringFind(name, PREFIX_CLOSE) == 0)
      {
         string ticketStr = StringSubstr(name, StringLen(PREFIX_CLOSE));
         ulong ticket = (ulong)StringToInteger(ticketStr);
         ulong tsValue = (ulong)value;
         if(AlreadyProcessed(g_lastCloseTs, g_lastCloseTicket, ticket, tsValue))
            continue;
         if(ticket > 0 && PositionSelectByTicket(ticket))
         {
            if(trade.PositionClose(ticket))
            {
               if(InpLog) PrintFormat("[Mt5BridgeHelper] Close position #%I64u OK", ticket);
            }
            else if(InpLog)
            {
               PrintFormat("[Mt5BridgeHelper] Close position #%I64u FAILED: %d",
                           ticket, GetLastError());
            }
            GlobalVariableDel(name);
         }
         else
         {
            GlobalVariableDel(name);
         }
         MarkProcessed(g_lastCloseTs, g_lastCloseTicket, ticket, tsValue);
      }
   }
}

//+------------------------------------------------------------------+
//| Expert initialization                                             |
//+------------------------------------------------------------------+
int OnInit()
{
   trade.SetExpertMagicNumber(0);
   trade.SetDeviationInPoints(10);
   trade.SetTypeFilling(ORDER_FILLING_FOK);
   if(InpLog) Print("[Mt5BridgeHelper] Started. Polling every ", InpPollSeconds, "s");
   EventSetTimer(InpPollSeconds);
   return(INIT_SUCCEEDED);
}

//+------------------------------------------------------------------+
//| Expert deinitialization                                           |
//+------------------------------------------------------------------+
void OnDeinit(const int reason)
{
   EventKillTimer();
}

//+------------------------------------------------------------------+
//| Timer handler                                                     |
//+------------------------------------------------------------------+
void OnTimer()
{
   ProcessCommands();
}
//+------------------------------------------------------------------+