chore: refacto

backend/gestion/utils/delivery.go

@@ -0,0 +1,44 @@
+package utils
+
+import (
+	"fmt"
+	"math"
+)
+
+func CalculateDistance(lat1, lon1, lat2, lon2 float64) float64 {
+	const earthRadiusKm = 6371
+	const metersPerKm = 1000
+
+	lat1Rad := DegreesToRadians(lat1)
+	lon1Rad := DegreesToRadians(lon1)
+	lat2Rad := DegreesToRadians(lat2)
+	lon2Rad := DegreesToRadians(lon2)
+
+	dLat := lat2Rad - lat1Rad
+	dLon := lon2Rad - lon1Rad
+
+	a := math.Sin(dLat/2)*math.Sin(dLat/2) +
+		math.Cos(lat1Rad)*math.Cos(lat2Rad)*
+			math.Sin(dLon/2)*math.Sin(dLon/2)
+
+	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
+	return earthRadiusKm * c * metersPerKm
+}
+
+func DegreesToRadians(degrees float64) float64 {
+	return degrees * math.Pi / 180
+}
+
+func GetDeliveryStatusMessage(status string) string {
+	messages := map[string]string{
+		"assigned":  "Commande assignée",
+		"en_route":  "En route vers le client",
+		"arrived":   "Arrivé à destination",
+		"livre":     "Livraison effectuée",
+		"cancelled": "Livraison annulée",
+	}
+	if msg, ok := messages[status]; ok {
+		return msg
+	}
+	return fmt.Sprintf("Statut changé: %s", status)
+}