improve/profitStatsTracker: use CsvFormatter interface

pkg/report/profit_report.go

@@ -108,15 +108,8 @@ func (r *AccumulatedProfitReport) Rotate(ps *types.ProfitStats, ts *types.TradeS
 	r.profitFactorPerInterval.Update(ts.ProfitFactor.Float64())
 }
 
-// Output Accumulated profit report to a TSV file
+// CsvHeader returns a header slice
-func (r *AccumulatedProfitReport) Output() {
+func (r *AccumulatedProfitReport) CsvHeader() []string {
-	if r.TsvReportPath != "" {
-		tsvwiter, err := tsv.AppendWriterFile(r.TsvReportPath)
-		if err != nil {
-			panic(err)
-		}
-		defer tsvwiter.Close()
-		// Output title row
 	titles := []string{
 		"#",
 		"Symbol",
@@ -128,12 +121,18 @@ func (r *AccumulatedProfitReport) Output() {
 		"profitFactor",
 		fmt.Sprintf("%s%d Trades", r.Interval, r.Window),
 	}
+
 	for i := 0; i < len(r.strategyParameters); i++ {
 		titles = append(titles, r.strategyParameters[i][0])
 	}
-		_ = tsvwiter.Write(titles)
 
-		// Output data row
+	return titles
+}
+
+// CsvRecords returns a data slice
+func (r *AccumulatedProfitReport) CsvRecords() [][]string {
+	var data [][]string
+
 	for i := 0; i <= r.Window-1; i++ {
 		values := []string{
 			strconv.Itoa(i + 1),
@@ -149,7 +148,27 @@ func (r *AccumulatedProfitReport) Output() {
 		for j := 0; j < len(r.strategyParameters); j++ {
 			values = append(values, r.strategyParameters[j][1])
 		}
-			_ = tsvwiter.Write(values)
+
+		data = append(data, values)
 	}
+
+	return data
+}
+
+// Output Accumulated profit report to a TSV file
+func (r *AccumulatedProfitReport) Output() {
+	if r.TsvReportPath != "" {
+		// Open specified file for appending
+		tsvwiter, err := tsv.AppendWriterFile(r.TsvReportPath)
+		if err != nil {
+			panic(err)
+		}
+		defer tsvwiter.Close()
+
+		// Column Title
+		_ = tsvwiter.Write(r.CsvHeader())
+
+		// Output data rows
+		_ = tsvwiter.WriteAll(r.CsvRecords())
 	}
 }