use the time of the first trade as the report start time

cmd/run.go

@@ -82,14 +82,16 @@ var runCmd = &cobra.Command{
 			trader.AttachCrossExchangeStrategy(strategy)
 		}
 
-		// TODO: load these from config file
-		trader.ReportPnL(notifier).
-			AverageCostBySymbols("BTCUSDT", "BNBUSDT").
-			Of("binance").When("@daily", "@hourly")
-
-		trader.ReportPnL(notifier).
-			AverageCostBySymbols("MAXUSDT").
-			Of("max").When("@daily", "@hourly")
+		for _, report := range userConfig.PnLReporters {
+			if len(report.AverageCostBySymbols) > 0 {
+				trader.ReportPnL(notifier).
+					AverageCostBySymbols(report.AverageCostBySymbols...).
+					Of(report.Of...).
+					When(report.When...)
+			} else {
+				return errors.Errorf("unsupported PnL reporter: %+v", report)
+			}
+		}
 
 		err = trader.Run(ctx)
 		if err != nil {

config/bbgo.yaml

@@ -35,5 +35,5 @@ exchangeStrategies:
     buyandhold:
       symbol: "BTCUSDT"
       interval: "1m"
-      baseQuantity: 0.1
-      minDropPercentage: -0.05
+      baseQuantity: 0.01
+      minDropPercentage: -0.02

pkg/accounting/pnl/avg_cost.go

@@ -2,7 +2,6 @@ package pnl
 
 import (
 	"strings"
-	"time"
 
 	"github.com/sirupsen/logrus"
 
@@ -10,8 +9,6 @@ import (
 )
 
 type AverageCostCalculator struct {
-	Symbol             string
-	StartTime          time.Time
 	TradingFeeCurrency string
 }
 
@@ -89,9 +86,9 @@ func (c *AverageCostCalculator) Calculate(symbol string, trades []types.Trade, c
 
 	return &AverageCostPnlReport{
 		Symbol:       symbol,
-		StartTime:    c.StartTime,
 		CurrentPrice: currentPrice,
 		NumTrades:    len(trades),
+		StartTime:    trades[0].Time,
 
 		BidVolume: bidVolume,
 		AskVolume: askVolume,