/*
Copyright 2019 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 (
	flowcontrolv1alpha1 "k8s.io/api/flowcontrol/v1alpha1"
	"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/flowcontrol"
	flowschemastore "k8s.io/kubernetes/pkg/registry/flowcontrol/flowschema/storage"
	prioritylevelconfigurationstore "k8s.io/kubernetes/pkg/registry/flowcontrol/prioritylevelconfiguration/storage"
)

// RESTStorageProvider implements
type RESTStorageProvider struct{}

// NewRESTStorage creates a new rest storage for flow-control api models.
func (p RESTStorageProvider) NewRESTStorage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) (genericapiserver.APIGroupInfo, bool, error) {
	apiGroupInfo := genericapiserver.NewDefaultAPIGroupInfo(flowcontrol.GroupName, legacyscheme.Scheme, legacyscheme.ParameterCodec, legacyscheme.Codecs)

	if apiResourceConfigSource.VersionEnabled(flowcontrolv1alpha1.SchemeGroupVersion) {
		flowControlStorage, err := p.v1alpha1Storage(apiResourceConfigSource, restOptionsGetter)
		if err != nil {
			return genericapiserver.APIGroupInfo{}, false, err
		}
		apiGroupInfo.VersionedResourcesStorageMap[flowcontrolv1alpha1.SchemeGroupVersion.Version] = flowControlStorage
	}
	return apiGroupInfo, true, nil
}

func (p RESTStorageProvider) v1alpha1Storage(apiResourceConfigSource serverstorage.APIResourceConfigSource, restOptionsGetter generic.RESTOptionsGetter) (map[string]rest.Storage, error) {
	storage := map[string]rest.Storage{}

	// flow-schema
	flowSchemaStorage, flowSchemaStatusStorage, err := flowschemastore.NewREST(restOptionsGetter)
	if err != nil {
		return nil, err
	}
	storage["flowschemas"] = flowSchemaStorage
	storage["flowschemas/status"] = flowSchemaStatusStorage

	// priority-level-configuration
	priorityLevelConfigurationStorage, priorityLevelConfigurationStatusStorage, err := prioritylevelconfigurationstore.NewREST(restOptionsGetter)
	if err != nil {
		return nil, err
	}
	storage["prioritylevelconfigurations"] = priorityLevelConfigurationStorage
	storage["prioritylevelconfigurations/status"] = priorityLevelConfigurationStatusStorage

	return storage, nil
}

// GroupName returns group name of the storage
func (p RESTStorageProvider) GroupName() string {
	return flowcontrol.GroupName
}