/*
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"

	"k8s.io/apimachinery/pkg/apis/meta/internalversion"
	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"
	"k8s.io/apiserver/pkg/warning"
	"k8s.io/kubernetes/pkg/apis/batch"
	"k8s.io/kubernetes/pkg/printers"
	printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
	printerstorage "k8s.io/kubernetes/pkg/printers/storage"
	"k8s.io/kubernetes/pkg/registry/batch/job"
	"sigs.k8s.io/structured-merge-diff/v4/fieldpath"
)

// JobStorage includes dummy storage for Job.
type JobStorage struct {
	Job    *REST
	Status *StatusREST
}

// NewStorage creates a new JobStorage against etcd.
func NewStorage(optsGetter generic.RESTOptionsGetter) (JobStorage, error) {
	jobRest, jobStatusRest, err := NewREST(optsGetter)
	if err != nil {
		return JobStorage{}, err
	}

	return JobStorage{
		Job:    jobRest,
		Status: jobStatusRest,
	}, nil
}

var deleteOptionWarnings = "child pods are preserved by default when jobs are deleted; " +
	"set propagationPolicy=Background to remove them or set propagationPolicy=Orphan to suppress this warning"

// REST implements a RESTStorage for jobs against etcd
type REST struct {
	*genericregistry.Store
}

// NewREST returns a RESTStorage object that will work against Jobs.
func NewREST(optsGetter generic.RESTOptionsGetter) (*REST, *StatusREST, error) {
	store := &genericregistry.Store{
		NewFunc:                   func() runtime.Object { return &batch.Job{} },
		NewListFunc:               func() runtime.Object { return &batch.JobList{} },
		PredicateFunc:             job.MatchJob,
		DefaultQualifiedResource:  batch.Resource("jobs"),
		SingularQualifiedResource: batch.Resource("job"),

		CreateStrategy:      job.Strategy,
		UpdateStrategy:      job.Strategy,
		DeleteStrategy:      job.Strategy,
		ResetFieldsStrategy: job.Strategy,

		TableConvertor: printerstorage.TableConvertor{TableGenerator: printers.NewTableGenerator().With(printersinternal.AddHandlers)},
	}
	options := &generic.StoreOptions{RESTOptions: optsGetter, AttrFunc: job.GetAttrs}
	if err := store.CompleteWithOptions(options); err != nil {
		return nil, nil, err
	}

	statusStore := *store
	statusStore.UpdateStrategy = job.StatusStrategy
	statusStore.ResetFieldsStrategy = job.StatusStrategy

	return &REST{store}, &StatusREST{store: &statusStore}, nil
}

// Implement CategoriesProvider
var _ rest.CategoriesProvider = &REST{}

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

func (r *REST) Delete(ctx context.Context, name string, deleteValidation rest.ValidateObjectFunc, options *metav1.DeleteOptions) (runtime.Object, bool, error) {
	//nolint:staticcheck // SA1019 backwards compatibility
	//nolint: staticcheck
	if options != nil && options.PropagationPolicy == nil && options.OrphanDependents == nil &&
		job.Strategy.DefaultGarbageCollectionPolicy(ctx) == rest.OrphanDependents {
		// Throw a warning if delete options are not explicitly set as Job deletion strategy by default is orphaning
		// pods in v1.
		warning.AddWarning(ctx, "", deleteOptionWarnings)
	}
	return r.Store.Delete(ctx, name, deleteValidation, options)
}

func (r *REST) DeleteCollection(ctx context.Context, deleteValidation rest.ValidateObjectFunc, deleteOptions *metav1.DeleteOptions, listOptions *internalversion.ListOptions) (runtime.Object, error) {
	//nolint:staticcheck // SA1019 backwards compatibility
	if deleteOptions.PropagationPolicy == nil && deleteOptions.OrphanDependents == nil &&
		job.Strategy.DefaultGarbageCollectionPolicy(ctx) == rest.OrphanDependents {
		// Throw a warning if delete options are not explicitly set as Job deletion strategy by default is orphaning
		// pods in v1.
		warning.AddWarning(ctx, "", deleteOptionWarnings)
	}
	return r.Store.DeleteCollection(ctx, deleteValidation, deleteOptions, listOptions)
}

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

// New creates a new Job object.
func (r *StatusREST) New() runtime.Object {
	return &batch.Job{}
}

// Destroy cleans up resources on shutdown.
func (r *StatusREST) Destroy() {
	// Given that underlying store is shared with REST,
	// we don't destroy it here explicitly.
}

// 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)
}

// GetResetFields implements rest.ResetFieldsStrategy
func (r *StatusREST) GetResetFields() map[fieldpath.APIVersion]*fieldpath.Set {
	return r.store.GetResetFields()
}

func (r *StatusREST) ConvertToTable(ctx context.Context, object runtime.Object, tableOptions runtime.Object) (*metav1.Table, error) {
	return r.store.ConvertToTable(ctx, object, tableOptions)
}
