Add detailed PnL and duration stats to dashboard

trader.go

@@ -753,6 +753,62 @@ func (t *Trader) GetClosedStats() (converged, diverged, flat, total int) {
 	return
 }
 
+// GetDetailedStats returns comprehensive trading statistics.
+type DetailedStats struct {
+	TotalTrades      int     `json:"total_trades"`
+	TotalPnlPct      float64 `json:"total_pnl_pct"`
+	AvgPnlPct        float64 `json:"avg_pnl_pct"`
+	MaxProfitPct     float64 `json:"max_profit_pct"`
+	MaxLossPct       float64 `json:"max_loss_pct"`
+	AvgDuration      string  `json:"avg_duration"`
+	TotalDuration    string  `json:"total_duration"`
+	WinningTrades    int     `json:"winning_trades"`
+	LosingTrades     int     `json:"losing_trades"`
+	WinRate          float64 `json:"win_rate"`
+}
+
+func (t *Trader) GetDetailedStats() DetailedStats {
+	t.mu.Lock()
+	defer t.mu.Unlock()
+	ds := DetailedStats{}
+	if len(t.closedTrades) == 0 {
+		return ds
+	}
+	var totalDur time.Duration
+	ds.MaxLossPct = 1e9 // sentinel
+	for _, tr := range t.closedTrades {
+		ds.TotalTrades++
+		ds.TotalPnlPct += tr.PnlPct
+		if tr.PnlPct >= 0 {
+			ds.WinningTrades++
+			if tr.PnlPct > ds.MaxProfitPct {
+				ds.MaxProfitPct = tr.PnlPct
+			}
+		} else {
+			ds.LosingTrades++
+			if tr.PnlPct < ds.MaxLossPct {
+				ds.MaxLossPct = tr.PnlPct
+			}
+		}
+		if !tr.ClosedAt.IsZero() && !tr.OpenedAt.IsZero() {
+			totalDur += tr.ClosedAt.Sub(tr.OpenedAt)
+		}
+	}
+	if ds.MaxLossPct == 1e9 {
+		ds.MaxLossPct = 0
+	}
+	if ds.TotalTrades > 0 {
+		ds.AvgPnlPct = ds.TotalPnlPct / float64(ds.TotalTrades)
+		ds.WinRate = float64(ds.WinningTrades) / float64(ds.TotalTrades) * 100
+	}
+	if totalDur > 0 {
+		avgDur := totalDur / time.Duration(ds.TotalTrades)
+		ds.AvgDuration = avgDur.Round(time.Second).String()
+		ds.TotalDuration = totalDur.Round(time.Second).String()
+	}
+	return ds
+}
+
 // GetClosedTrades returns the full closed trade history.
 func (t *Trader) GetClosedTrades() []TradeRecord {
 	t.mu.Lock()