add UpgradeBuilding functionallity

constants/constants.go

@@ -1,5 +1,9 @@
 package constants
 
+import (
+	"github.com/arnaucube/gogame/models"
+)
+
 // game constants
 
 const GALAXYSIZE = 50
@@ -31,3 +35,28 @@ var EnergyMineLevels = []int64{
 	5,
 	10,
 }
+
+// BuildingsNeededResources hold
+// map with all the buildings, that each one is a map with the levels of the buildings with the needed ressources
+var BuildingsNeededResources = map[string]map[int64]models.Resources{
+	"metalplant": map[int64]models.Resources{
+		1: models.Resources{
+			Metal:     50,
+			Crystal:   50,
+			Deuterium: 50,
+			Energy:    50,
+		},
+		2: models.Resources{
+			Metal:     70,
+			Crystal:   70,
+			Deuterium: 70,
+			Energy:    70,
+		},
+		3: models.Resources{
+			Metal:     90,
+			Crystal:   90,
+			Deuterium: 90,
+			Energy:    90,
+		},
+	},
+}