separate trading212 logic

internal/direction.go

@@ -0,0 +1,28 @@
+package internal
+
+type Direction uint
+
+const (
+	DirectionUnknown Direction = 0
+	DirectionBuy     Direction = 1
+	DirectionSell    Direction = 2
+)
+
+func (d Direction) String() string {
+	switch d {
+	case 1:
+		return "buy"
+	case 2:
+		return "sell"
+	default:
+		return "unknown"
+	}
+}
+
+func (d Direction) IsBuy() bool {
+	return d == DirectionBuy
+}
+
+func (d Direction) IsSell() bool {
+	return d == DirectionSell
+}