/*
Copyright 2015 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 storage

import (
	"context"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apiserver/pkg/registry/generic"
	genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
	"k8s.io/apiserver/pkg/registry/rest"
	api "k8s.io/kubernetes/pkg/apis/core"
	"k8s.io/kubernetes/pkg/printers"
	printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
	printerstorage "k8s.io/kubernetes/pkg/printers/storage"
	"k8s.io/kubernetes/pkg/registry/core/service"
)

type GenericREST struct {
	*genericregistry.Store
}

// NewREST returns a RESTStorage object that will work against services.
func NewGenericREST(optsGetter generic.RESTOptionsGetter) (*GenericREST, *StatusREST) {
	store := &genericregistry.Store{
		NewFunc:                  func() runtime.Object { return &api.Service{} },
		NewListFunc:              func() runtime.Object { return &api.ServiceList{} },
		DefaultQualifiedResource: api.Resource("services"),
		ReturnDeletedObject:      true,

		CreateStrategy: service.Strategy,
		UpdateStrategy: service.Strategy,
		DeleteStrategy: service.Strategy,
		ExportStrategy: service.Strategy,

		TableConvertor: printerstorage.TableConvertor{TablePrinter: printers.NewTablePrinter().With(printersinternal.AddHandlers)},
	}
	options := &generic.StoreOptions{RESTOptions: optsGetter}
	if err := store.CompleteWithOptions(options); err != nil {
		panic(err) // TODO: Propagate error up
	}

	statusStore := *store
	statusStore.UpdateStrategy = service.StatusStrategy
	return &GenericREST{store}, &StatusREST{store: &statusStore}
}

var (
	_ rest.ShortNamesProvider = &GenericREST{}
	_ rest.CategoriesProvider = &GenericREST{}
)

// ShortNames implements the ShortNamesProvider interface. Returns a list of short names for a resource.
func (r *GenericREST) ShortNames() []string {
	return []string{"svc"}
}

// Categories implements the CategoriesProvider interface. Returns a list of categories a resource is part of.
func (r *GenericREST) Categories() []string {
	return []string{"all"}
}

// StatusREST implements the GenericREST endpoint for changing the status of a service.
type StatusREST struct {
	store *genericregistry.Store
}

func (r *StatusREST) New() runtime.Object {
	return &api.Service{}
}

// Get retrieves the object from the storage. It is required to support Patch.
func (r *StatusREST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
	return r.store.Get(ctx, name, options)
}

// Update alters the status subset of an object.
func (r *StatusREST) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
	// We are explicitly setting forceAllowCreate to false in the call to the underlying storage because
	// subresources should never allow create on update.
	return r.store.Update(ctx, name, objInfo, createValidation, updateValidation, false, options)
}
