/*
Copyright 2021 Intel Corporation

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 kubernetes

// ClassOrigin type indicates the source of container's class
// information: whether it is found from CRI level container
// annotations, Kubernetes' pod annotations, or it has not been found
// at all.
type ClassOrigin int

const (
	ClassOriginNotFound ClassOrigin = iota
	ClassOriginContainerAnnotation
	ClassOriginPodAnnotation
)

func (c ClassOrigin) String() string {
	switch c {
	case ClassOriginNotFound:
		return "<not found>"
	case ClassOriginContainerAnnotation:
		return "container annotations"
	case ClassOriginPodAnnotation:
		return "pod annotations"
	default:
		return "<unknown>"
	}
}

// ContainerClassFromAnnotations determines the effective class of a
// container from the Pod annotations and CRI level container
// annotations of a container.
func ContainerClassFromAnnotations(containerAnnotation, podAnnotation, podAnnotationContainerPrefix string, containerName string, containerAnnotations, podAnnotations map[string]string) (string, ClassOrigin) {
	if clsName, ok := containerAnnotations[containerAnnotation]; ok {
		return clsName, ClassOriginContainerAnnotation
	}
	if clsName, ok := podAnnotations[podAnnotationContainerPrefix+containerName]; ok {
		return clsName, ClassOriginPodAnnotation
	}
	if clsName, ok := podAnnotations[podAnnotation]; ok {
		return clsName, ClassOriginPodAnnotation
	}
	return "", ClassOriginNotFound
}