new game, fs repo layer

pkg/model/game/production.go

@@ -0,0 +1,30 @@
+package game
+
+type PlanetProduction string
+
+const (
+	ProductionNone     PlanetProduction = "NONE"
+	ProductionMaterial PlanetProduction = "MAT"
+	ProductionCapital  PlanetProduction = "CAP"
+	ProductionDrive    PlanetProduction = "DRIVE"
+	ProductionWeapons  PlanetProduction = "WEAPONS"
+	ProductionShields  PlanetProduction = "SHIELDS"
+	ProductionCargo    PlanetProduction = "CARGO"
+
+	ProductionScience PlanetProduction = "SCIENCE"
+	ProductionShip    PlanetProduction = "SHIP"
+)
+
+type ProductionType struct {
+	Production  PlanetProduction
+	SubjectName string
+}
+
+func (p PlanetProduction) AsType(subject string) ProductionType {
+	switch p {
+	case ProductionScience, ProductionShip:
+		return ProductionType{Production: p, SubjectName: subject}
+	default:
+		return ProductionType{Production: p}
+	}
+}