/*
Copyright 2022 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.
*/

package rest

import (
	resourcev1alpha3 "k8s.io/api/resource/v1alpha3"
	"k8s.io/apiserver/pkg/registry/generic"
	"k8s.io/apiserver/pkg/registry/rest"
	genericapiserver "k8s.io/apiserver/pkg/server"
	serverstorage "k8s.io/apiserver/pkg/server/storage"
	"k8s.io/kubernetes/pkg/api/legacyscheme"
	"k8s.io/kubernetes/pkg/apis/resource"
	deviceclassstore "k8s.io/kubernetes/pkg/registry/resource/deviceclass/storage"
	podschedulingcontextsstore "k8s.io/kubernetes/pkg/registry/resource/podschedulingcontext/storage"
	resourceclaimstore "k8s.io/kubernetes/pkg/registry/resource/resourceclaim/storage"
	resourceclaimtemplatestore "k8s.io/kubernetes/pkg/registry/resource/resourceclaimtemplate/storage"
	resourceslicestore "k8s.io/kubernetes/pkg/registry/resource/resourceslice/storage"
)

type RESTStorageProvider struct{}

func (p RESTStorageProvider) NewRESTStorage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) (genericapiserver.APIGroupInfo, error) {
	apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(resource.GroupName, legacyscheme.Scheme, legacyscheme.ParameterCodec, legacyscheme.Codecs)
	// If you add a version here, be sure to add an entry in `k8s.io/kubernetes/cmd/kube-apiserver/app/aggregator.go with specific priorities.
	// TODO refactor the plumbing to provide the information in the APIGroupInfo

	if storageMap, err := p.v1alpha3Storage(apiResourceConfigSource, restOptionsGetter); err != nil {
		return genericapiserver.APIGroupInfo{}, err
	} else if len(storageMap) > 0 {
		apiGroupInfo.VersionedResourcesStorageMap[resourcev1alpha3.SchemeGroupVersion.Version] = storageMap
	}

	return apiGroupInfo, nil
}

func (p RESTStorageProvider) v1alpha3Storage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) (map[string]rest.Storage, error) {
	storage := map[string]rest.Storage{}

	if resource := "deviceclasses"; apiResourceConfigSource.ResourceEnabled(resourcev1alpha3.SchemeGroupVersion.WithResource(resource)) {
		deviceclassStorage, err := deviceclassstore.NewREST(restOptionsGetter)
		if err != nil {
			return nil, err
		}
		storage[resource] = deviceclassStorage
	}

	if resource := "resourceclaims"; apiResourceConfigSource.ResourceEnabled(resourcev1alpha3.SchemeGroupVersion.WithResource(resource)) {
		resourceClaimStorage, resourceClaimStatusStorage, err := resourceclaimstore.NewREST(restOptionsGetter)
		if err != nil {
			return nil, err
		}
		storage[resource] = resourceClaimStorage
		storage[resource+"/status"] = resourceClaimStatusStorage
	}

	if resource := "resourceclaimtemplates"; apiResourceConfigSource.ResourceEnabled(resourcev1alpha3.SchemeGroupVersion.WithResource(resource)) {
		resourceClaimTemplateStorage, err := resourceclaimtemplatestore.NewREST(restOptionsGetter)
		if err != nil {
			return nil, err
		}
		storage[resource] = resourceClaimTemplateStorage
	}

	// Registered also without the corresponding DRAControlPlaneController feature gate for the
	// same reasons as registering the other types without a feature gate check: it might be
	// useful to provide access to these resources while their feature is off to allow cleaning
	// them up.
	if resource := "podschedulingcontexts"; apiResourceConfigSource.ResourceEnabled(resourcev1alpha3.SchemeGroupVersion.WithResource(resource)) {
		podSchedulingStorage, podSchedulingStatusStorage, err := podschedulingcontextsstore.NewREST(restOptionsGetter)
		if err != nil {
			return nil, err
		}
		storage[resource] = podSchedulingStorage
		storage[resource+"/status"] = podSchedulingStatusStorage
	}

	if resource := "resourceslices"; apiResourceConfigSource.ResourceEnabled(resourcev1alpha3.SchemeGroupVersion.WithResource(resource)) {
		resourceSliceStorage, err := resourceslicestore.NewREST(restOptionsGetter)
		if err != nil {
			return nil, err
		}
		storage[resource] = resourceSliceStorage
	}

	return storage, nil
}

func (p RESTStorageProvider) GroupName() string {
	return resource.GroupName
}