Feat[BE]: implement max target quantity retrieval for kandangs and update routes

internal/modules/production/transfer_layings/services/transfer_laying.service.go

@@ -34,6 +34,7 @@ type TransferLayingService interface {
 	DeleteOne(ctx *fiber.Ctx, id uint) error
 	Approval(ctx *fiber.Ctx, req *validation.Approve) ([]entity.LayingTransfer, error)
 	GetAvailableQtyPerKandang(ctx *fiber.Ctx, projectFlockID uint) (*entity.ProjectFlock, map[uint]float64, error)
+	GetMaxTargetQtyPerKandang(ctx *fiber.Ctx, projectFlockID uint) (map[uint]float64, error)
 }
 
 type transferLayingService struct {
@@ -888,3 +889,39 @@ func (s *transferLayingService) validateKandangOwnership(
 
 	return nil
 }
+
+func (s transferLayingService) GetMaxTargetQtyPerKandang(c *fiber.Ctx, projectFlockID uint) (map[uint]float64, error) {
+
+	if err := commonSvc.EnsureRelations(c.Context(),
+		commonSvc.RelationCheck{Name: "Project Flock", ID: &projectFlockID, Exists: s.ProjectFlockRepo.IdExists},
+	); err != nil {
+		return nil, err
+	}
+
+	projectFlockKandangs, err := s.ProjectFlockKandangRepo.GetByProjectFlockID(c.Context(), projectFlockID)
+	if err != nil {
+		return nil, err
+	}
+
+	kandangMaxTargetQty := make(map[uint]float64)
+	for _, projectFlockKandang := range projectFlockKandangs {
+
+		capacity := projectFlockKandang.Kandang.Capacity
+
+		availableQty, err := s.ProjectFlockPopulationRepo.GetAvailableQtyByProjectFlockKandangID(
+			c.Context(),
+			projectFlockKandang.Id,
+		)
+		if err != nil {
+			return nil, err
+		}
+
+		kandangMaxTargetQty[projectFlockKandang.Id] = capacity - availableQty
+
+		if kandangMaxTargetQty[projectFlockKandang.Id] < 0 {
+			kandangMaxTargetQty[projectFlockKandang.Id] = 0
+		}
+	}
+
+	return kandangMaxTargetQty, nil
+}