/*
Copyright 2016 The Kubernetes Authors.

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.
*/

// This file was copied from "k8s.io/kubernetes/pkg/apis/storage/util/helpers.go

package util

import (
	"fmt"

	apiextensionsv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// IsDefaultStorageClassAnnotation represents a StorageClass annotation that
// marks a class as the default StorageClass
const IsDefaultStorageClassAnnotation = "storageclass.kubernetes.io/is-default-class"

// BetaIsDefaultStorageClassAnnotation is the beta version of IsDefaultStorageClassAnnotation.
// TODO: remove Beta when no longer used
const BetaIsDefaultStorageClassAnnotation = "storageclass.beta.kubernetes.io/is-default-class"

// IsDefaultAnnotation returns a boolean if
// the annotation is set
// TODO: remove Beta when no longer needed
func IsDefaultAnnotation(obj metav1.ObjectMeta) bool {
	if obj.Annotations[IsDefaultStorageClassAnnotation] == "true" {
		return true
	}
	if obj.Annotations[BetaIsDefaultStorageClassAnnotation] == "true" {
		return true
	}

	return false
}

var swaggerMetadataDescriptions = metav1.ObjectMeta{}.SwaggerDoc()

// GetColumnsForVersion returns the columns for given version or nil.
// NOTE: the newly logically-defaulted columns is not pointing to the original CRD object.
// One cannot mutate the original CRD columns using the logically-defaulted columns. Please iterate through
// the original CRD object instead.
func GetColumnsForVersion(crd *apiextensionsv1.CustomResourceDefinition, version string) ([]apiextensionsv1.CustomResourceColumnDefinition, error) {
	for _, v := range crd.Spec.Versions {
		if version == v.Name {
			return serveDefaultColumnsIfEmpty(v.AdditionalPrinterColumns), nil
		}
	}
	return nil, fmt.Errorf("version %s not found in CustomResourceDefinition: %v", version, crd.Name)
}

// serveDefaultColumnsIfEmpty applies logically defaulting to columns, if the input columns is empty.
// NOTE: in this way, the newly logically-defaulted columns is not pointing to the original CRD object.
// One cannot mutate the original CRD columns using the logically-defaulted columns. Please iterate through
// the original CRD object instead.
func serveDefaultColumnsIfEmpty(columns []apiextensionsv1.CustomResourceColumnDefinition) []apiextensionsv1.CustomResourceColumnDefinition {
	if len(columns) > 0 {
		return columns
	}
	return []apiextensionsv1.CustomResourceColumnDefinition{
		{Name: "Age", Type: "date", Description: swaggerMetadataDescriptions["creationTimestamp"], JSONPath: ".metadata.creationTimestamp"},
	}
}
