// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 metadata

import (
	"k8s.io/client-go/tools/cache"

	"github.com/elastic/beats/libbeat/common"
	"github.com/elastic/beats/libbeat/common/kubernetes"
)

type service struct {
	store     cache.Store
	namespace MetaGen
	resource  *Resource
}

// NewServiceMetadataGenerator creates a metagen for service resources
func NewServiceMetadataGenerator(cfg *common.Config, services cache.Store, namespace MetaGen) MetaGen {
	return &service{
		resource:  NewResourceMetadataGenerator(cfg),
		store:     services,
		namespace: namespace,
	}
}

// Generate generates service metadata from a resource object
func (s *service) Generate(obj kubernetes.Resource, opts ...FieldOptions) common.MapStr {
	svc, ok := obj.(*kubernetes.Service)
	if !ok {
		return nil
	}

	out := s.resource.Generate("service", obj, opts...)

	if s.namespace != nil {
		meta := s.namespace.GenerateFromName(svc.GetNamespace())
		if meta != nil {
			// Use this in 8.0
			//out.Put("namespace", meta["namespace"])
			out.DeepUpdate(meta)
		}
	}

	return out
}

// GenerateFromName generates pod metadata from a service name
func (s *service) GenerateFromName(name string, opts ...FieldOptions) common.MapStr {
	if s.store == nil {
		return nil
	}

	if obj, ok, _ := s.store.GetByKey(name); ok {
		svc, ok := obj.(*kubernetes.Service)
		if !ok {
			return nil
		}

		return s.Generate(svc, opts...)
	}

	return nil
}
