Added StatDB data type and IsKeyInvalid, AddStatistics methods

model/statisticsModel.go

@@ -0,0 +1,17 @@
+package model
+
+import (
+	"errors"
+
+	"github.com/ceticamarco/zephyr/types"
+)
+
+func GetStatistics(cityName string, statDB *types.StatDB) (types.StatResult, error) {
+	// Check whether there are sufficient and updated records for the given location
+	if statDB.IsKeyInvalid(cityName) {
+		return types.StatResult{}, errors.New("Insufficient or outdated data to perform statistical analysis")
+	}
+	// TODO: we have enough data, do the math!
+
+	return types.StatResult{}, nil
+}