// Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package validation

import (
	"github.com/gardener/gardener/pkg/gardenlet/apis/config"

	"k8s.io/apimachinery/pkg/util/validation/field"
)

// ValidateGardenletConfiguration validates a GardenletConfiguration object.
func ValidateGardenletConfiguration(cfg *config.GardenletConfiguration) field.ErrorList {
	allErrs := field.ErrorList{}

	if (cfg.SeedConfig == nil && cfg.SeedSelector == nil) || (cfg.SeedConfig != nil && cfg.SeedSelector != nil) {
		allErrs = append(allErrs, field.Invalid(field.NewPath("seedSelector/seedConfig"), cfg, "exactly one of `seedConfig` and `seedSelector` is required"))
	}

	return allErrs
}