//+------------------------------------------------------------------+
//| Trade.mqh – Step 3: Trade management for FVG strategy            |
//+------------------------------------------------------------------+
#ifndef __SIMPLE_FVG_TRADE_MQH__
#define __SIMPLE_FVG_TRADE_MQH__

#include "Config.mqh"
#include "Trend.mqh"
#include "FVG.mqh"

//--- Trading config nằm trong Config.mqh (Step 3)

//+------------------------------------------------------------------+
//| Internal helpers                                                 |
//+------------------------------------------------------------------+
int CountOurPositions()
{
   int count = 0;
   for(int i = 0; i < PositionsTotal(); i++)
   {
      ulong ticket = PositionGetTicket(i);
      if(ticket == 0) continue;
      if(!PositionSelectByTicket(ticket)) continue;

      if((long)PositionGetInteger(POSITION_MAGIC) == InpEAMagic &&
         (string)PositionGetString(POSITION_SYMBOL) == GetTradeSymbol())
      {
         count++;
      }
   }
   return count;
}

int CountOurLimitOrders()
{
   int count = 0;
   for(int i = 0; i < OrdersTotal(); i++)
   {
      ulong ticket = OrderGetTicket(i);
      if(ticket == 0) continue;
      if(!OrderSelect(ticket)) continue;

      ENUM_ORDER_TYPE type = (ENUM_ORDER_TYPE)OrderGetInteger(ORDER_TYPE);
      long            magic = (long)OrderGetInteger(ORDER_MAGIC);
      string          symbol = (string)OrderGetString(ORDER_SYMBOL);

      if(magic == InpEAMagic &&
         symbol == GetTradeSymbol() &&
         (type == ORDER_TYPE_BUY_LIMIT || type == ORDER_TYPE_SELL_LIMIT))
      {
         count++;
      }
   }
   return count;
}

void CancelAllOurLimitOrders()
{
   for(int i = OrdersTotal() - 1; i >= 0; i--)
   {
      ulong ticket = OrderGetTicket(i);
      if(ticket == 0) continue;
      if(!OrderSelect(ticket)) continue;

      ENUM_ORDER_TYPE type = (ENUM_ORDER_TYPE)OrderGetInteger(ORDER_TYPE);
      long            magic = (long)OrderGetInteger(ORDER_MAGIC);
      string          symbol = (string)OrderGetString(ORDER_SYMBOL);

      if(magic == InpEAMagic &&
         symbol == GetTradeSymbol() &&
         (type == ORDER_TYPE_BUY_LIMIT || type == ORDER_TYPE_SELL_LIMIT))
      {
         MqlTradeRequest req;
         MqlTradeResult  res;
         ZeroMemory(req);
         ZeroMemory(res);

         req.action = TRADE_ACTION_REMOVE;
         req.order  = ticket;

         if(!OrderSend(req, res) && InpDebugLog)
            PrintFormat("[Trade] Failed to cancel order #%I64u, retcode=%d",
                        ticket, res.retcode);
      }
   }
}

bool HasLimitOrderAtPrice(ENUM_ORDER_TYPE orderType, double entryPrice)
{
   double eps = 2 * _Point;
   for(int i = 0; i < OrdersTotal(); i++)
   {
      ulong ticket = OrderGetTicket(i);
      if(ticket == 0) continue;
      if(!OrderSelect(ticket)) continue;

      if((long)OrderGetInteger(ORDER_MAGIC) != InpEAMagic) continue;
      if((string)OrderGetString(ORDER_SYMBOL) != GetTradeSymbol()) continue;

      ENUM_ORDER_TYPE type = (ENUM_ORDER_TYPE)OrderGetInteger(ORDER_TYPE);
      if(type != orderType) continue;

      double price = OrderGetDouble(ORDER_PRICE_OPEN);
      if(MathAbs(price - entryPrice) <= eps)
         return true;
   }
   return false;
}

// Hủy các limit order quá "già" (tính theo số bar trên InpTimeframe)
void CancelStaleLimitOrders()
{
   if(InpLimitMaxAgeBars <= 0)
      return;

   datetime now = TimeCurrent();
   if(now == 0)
      return;

   int tfSeconds = PeriodSeconds(InpTimeframe);
   if(tfSeconds <= 0)
      return;

   int maxAgeSeconds = InpLimitMaxAgeBars * tfSeconds;

   for(int i = OrdersTotal() - 1; i >= 0; i--)
   {
      ulong ticket = OrderGetTicket(i);
      if(ticket == 0) continue;
      if(!OrderSelect(ticket)) continue;

      ENUM_ORDER_TYPE type = (ENUM_ORDER_TYPE)OrderGetInteger(ORDER_TYPE);
      long            magic = (long)OrderGetInteger(ORDER_MAGIC);
      string          symbol = (string)OrderGetString(ORDER_SYMBOL);

      if(magic != InpEAMagic) continue;
      if(symbol != GetTradeSymbol()) continue;
      if(type != ORDER_TYPE_BUY_LIMIT && type != ORDER_TYPE_SELL_LIMIT)
         continue;

      datetime setupTime = (datetime)OrderGetInteger(ORDER_TIME_SETUP);
      int ageSeconds = int(now - setupTime);
      if(ageSeconds < maxAgeSeconds)
         continue;

      MqlTradeRequest req;
      MqlTradeResult  res;
      ZeroMemory(req);
      ZeroMemory(res);

      req.action = TRADE_ACTION_REMOVE;
      req.order  = ticket;

      if(!OrderSend(req, res) && InpDebugLog)
         PrintFormat("[Trade] Failed to cancel stale order #%I64u, ageBars=%d, retcode=%d",
                     ticket, ageSeconds / tfSeconds, res.retcode);
   }
}

void GetTradeStats(int &totalTrades, int &tpTrades, int &slTrades)
{
   totalTrades = 0;
   tpTrades    = 0;
   slTrades    = 0;

   datetime now = TimeCurrent();
   if(now == 0)
      return;

   if(!HistorySelect(0, now))
      return;

   int deals = HistoryDealsTotal();
   string symbol = GetTradeSymbol();

   for(int i = 0; i < deals; i++)
   {
      ulong dealTicket = HistoryDealGetTicket(i);
      if(dealTicket == 0)
         continue;

      string dealSymbol = (string)HistoryDealGetString(dealTicket, DEAL_SYMBOL);
      long   dealMagic  = (long)HistoryDealGetInteger(dealTicket, DEAL_MAGIC);
      if(dealSymbol != symbol || dealMagic != InpEAMagic)
         continue;

      ENUM_DEAL_ENTRY entry = (ENUM_DEAL_ENTRY)HistoryDealGetInteger(dealTicket, DEAL_ENTRY);
      if(entry != DEAL_ENTRY_OUT && entry != DEAL_ENTRY_INOUT)
         continue;

      totalTrades++;

      ENUM_DEAL_REASON reason = (ENUM_DEAL_REASON)HistoryDealGetInteger(dealTicket, DEAL_REASON);
      if(reason == DEAL_REASON_TP)
         tpTrades++;
      else if(reason == DEAL_REASON_SL)
         slTrades++;
   }
}

// Tính khối lượng lot sao cho 1R = InpRiskPercentPerR % balance
double CalculateRiskLotSize(double entryPrice, double slPrice)
{
   string symbol = GetTradeSymbol();

   double balance   = AccountInfoDouble(ACCOUNT_BALANCE);
   double tickSize  = SymbolInfoDouble(symbol, SYMBOL_TRADE_TICK_SIZE);
   double tickValue = SymbolInfoDouble(symbol, SYMBOL_TRADE_TICK_VALUE);
   double volMin    = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MIN);
   double volMax    = SymbolInfoDouble(symbol, SYMBOL_VOLUME_MAX);
   double volStep   = SymbolInfoDouble(symbol, SYMBOL_VOLUME_STEP);

   double priceDiff = MathAbs(entryPrice - slPrice);
   if(balance <= 0 || tickSize <= 0 || tickValue <= 0 || priceDiff <= 0)
      return 0.0;

   double riskMoney = balance * InpRiskPercentPerR / 100.0;
   if(riskMoney <= 0.0)
      return 0.0;

   double ticks      = priceDiff / tickSize;
   double costPerLot = ticks * tickValue; // tiền lỗ nếu 1 lot hit SL
   if(costPerLot <= 0.0)
      return 0.0;

   double rawVolume = riskMoney / costPerLot;

   // Làm tròn đến 2 chữ số thập phân
   double rounded2 = MathFloor(rawVolume * 100.0 + 0.5) / 100.0;

   // Canh theo step volume
   if(volStep > 0.0)
      rounded2 = MathFloor(rounded2 / volStep) * volStep;

   // Giới hạn theo min/max
   if(rounded2 < volMin)
      rounded2 = volMin;
   if(rounded2 > volMax)
      rounded2 = volMax;

   return rounded2;
}

bool PlaceLimitForZone(const FVGZone &zone)
{
   string symbol = GetTradeSymbol();

   double entryPrice;
   double slPrice;
   double tpPrice;
   ENUM_ORDER_TYPE orderType;

   double zoneHeight = zone.upperEdge - zone.lowerEdge;
   if(zoneHeight <= 0.0)
      return false;

   double touchRatio = InpFVGTouchedPercent / 100.0;

   if(zone.type == FVG_BULLISH)
   {
      // Entry: 40% từ đỉnh vùng xuống
      entryPrice = zone.upperEdge - zoneHeight * touchRatio;
      slPrice    = zone.slReferencePrice;

      double risk = entryPrice - slPrice;
      if(risk <= 0) return false;
      tpPrice   = entryPrice + risk * InpRRRatio;
      orderType = ORDER_TYPE_BUY_LIMIT;
   }
   else // FVG_BEARISH
   {
      // Entry: 40% từ đáy vùng lên
      entryPrice = zone.lowerEdge + zoneHeight * touchRatio;
      slPrice    = zone.slReferencePrice;

      double risk = slPrice - entryPrice;
      if(risk <= 0) return false;
      tpPrice   = entryPrice - risk * InpRRRatio;
      orderType = ORDER_TYPE_SELL_LIMIT;
   }

   // Không tạo lệnh nếu đã có limit trùng giá/type
   if(HasLimitOrderAtPrice(orderType, entryPrice))
      return false;

   double volume = CalculateRiskLotSize(entryPrice, slPrice);
   if(volume <= 0.0)
      return false;

   MqlTradeRequest req;
   MqlTradeResult  res;
   ZeroMemory(req);
   ZeroMemory(res);

   req.action   = TRADE_ACTION_PENDING;
   req.symbol   = symbol;
   req.magic    = InpEAMagic;
   req.type     = orderType;
   req.volume   = volume;
   req.price    = entryPrice;
   req.sl       = slPrice;
   req.tp       = tpPrice;
   req.type_filling = ORDER_FILLING_RETURN;

   req.deviation = 10;
   req.comment   = "SimpleFVG";

   if(!OrderSend(req, res))
      return false;

   return (res.retcode == TRADE_RETCODE_DONE || res.retcode == TRADE_RETCODE_PLACED);
}

//+------------------------------------------------------------------+
//| Public: main trade manager                                       |
//+------------------------------------------------------------------+
void ManageFVGTrades()
{
   if(!InpTradeEnabled)
      return;

   // Hủy các lệnh limit đã quá số bar cho phép
   CancelStaleLimitOrders();

   // Nếu đã có vị thế, hủy toàn bộ limit còn lại
   if(CountOurPositions() > 0)
   {
      CancelAllOurLimitOrders();
      return;
   }

   int currentLimits = CountOurLimitOrders();
   if(currentLimits >= InpMaxLimitOrders)
      return;

   // Đặt lệnh limit khi giá vừa chạm cạnh ngoài FVG (trước khi fill đủ 40%)
   ENUM_TREND_DIRECTION trend = g_CurrentTrend;
   string symbol = GetTradeSymbol();
   double lastHigh = iHigh(symbol, InpTimeframe, 1);
   double lastLow  = iLow (symbol, InpTimeframe, 1);

   for(int i = g_FVGCount - 1; i >= 0 && currentLimits < InpMaxLimitOrders; i--)
   {
      FVGZone zone = g_FVGZones[i];
      if(!IsZoneActive(zone) || IsZoneMitigated(zone))
         continue;

      if(zone.type == FVG_BULLISH && trend != TREND_BULLISH)
         continue;
      if(zone.type == FVG_BEARISH && trend != TREND_BEARISH)
         continue;

      bool touchedEdge = false;

      if(zone.type == FVG_BULLISH)
      {
         // giá chạm cạnh trên (upperEdge) của bullish FVG
         if(lastLow <= zone.upperEdge && lastHigh >= zone.upperEdge)
            touchedEdge = true;
      }
      else // FVG_BEARISH
      {
         // giá chạm cạnh dưới (lowerEdge) của bearish FVG
         if(lastHigh >= zone.lowerEdge && lastLow <= zone.lowerEdge)
            touchedEdge = true;
      }

      if(!touchedEdge)
         continue;

      if(PlaceLimitForZone(zone))
         currentLimits++;
   }
}

#endif