// Copyright (c) 2018 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/apis/core"

	corev1 "k8s.io/api/core/v1"
	apivalidation "k8s.io/apimachinery/pkg/api/validation"
	"k8s.io/apimachinery/pkg/util/validation/field"
)

// ValidateSecretBinding validates a SecretBinding object.
func ValidateSecretBinding(binding *core.SecretBinding) field.ErrorList {
	allErrs := field.ErrorList{}

	allErrs = append(allErrs, apivalidation.ValidateObjectMeta(&binding.ObjectMeta, true, ValidateName, field.NewPath("metadata"))...)
	allErrs = append(allErrs, validateSecretReferenceOptionalNamespace(binding.SecretRef, field.NewPath("secretRef"))...)
	for i, quota := range binding.Quotas {
		allErrs = append(allErrs, validateObjectReferenceOptionalNamespace(quota, field.NewPath("quotas").Index(i))...)
	}

	return allErrs
}

// ValidateSecretBindingUpdate validates a SecretBinding object before an update.
func ValidateSecretBindingUpdate(newBinding, oldBinding *core.SecretBinding) field.ErrorList {
	allErrs := field.ErrorList{}

	allErrs = append(allErrs, apivalidation.ValidateObjectMetaUpdate(&newBinding.ObjectMeta, &oldBinding.ObjectMeta, field.NewPath("metadata"))...)
	allErrs = append(allErrs, apivalidation.ValidateImmutableField(newBinding.SecretRef, oldBinding.SecretRef, field.NewPath("secretRef"))...)
	allErrs = append(allErrs, apivalidation.ValidateImmutableField(newBinding.Quotas, oldBinding.Quotas, field.NewPath("quotas"))...)
	allErrs = append(allErrs, ValidateSecretBinding(newBinding)...)

	return allErrs
}

func validateAuditPolicyConfigMapReference(ref *corev1.ObjectReference, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}

	if len(ref.Name) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("name"), "must provide a name"))
	}

	return allErrs
}

func validateObjectReferenceOptionalNamespace(ref corev1.ObjectReference, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}

	if len(ref.Name) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("name"), "must provide a name"))
	}

	return allErrs
}

func validateSecretReferenceOptionalNamespace(ref corev1.SecretReference, fldPath *field.Path) field.ErrorList {
	allErrs := field.ErrorList{}

	if len(ref.Name) == 0 {
		allErrs = append(allErrs, field.Required(fldPath.Child("name"), "must provide a name"))
	}

	return allErrs
}