// 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 node_stats

import (
	"encoding/json"

	"github.com/pkg/errors"

	"github.com/elastic/beats/libbeat/common"
	s "github.com/elastic/beats/libbeat/common/schema"
	c "github.com/elastic/beats/libbeat/common/schema/mapstriface"
	"github.com/elastic/beats/metricbeat/mb"
	"github.com/elastic/beats/metricbeat/module/logstash"
)

var (
	schema = s.Schema{
		"events": c.Dict("events", s.Schema{
			"in":       c.Int("in"),
			"out":      c.Int("out"),
			"filtered": c.Int("filtered"),
		}),
	}
)

func eventMapping(r mb.ReporterV2, content []byte) error {
	var data map[string]interface{}
	err := json.Unmarshal(content, &data)
	if err != nil {
		err = errors.Wrap(err, "failure parsing Logstash Node Stats API response")
		r.Error(err)
		return err
	}

	fields, err := schema.Apply(data)
	if err != nil {
		r.Error(errors.Wrap(err, "failure applying node stats schema"))
	}

	event := mb.Event{}
	event.RootFields = common.MapStr{}
	event.RootFields.Put("service.name", logstash.ModuleName)

	event.MetricSetFields = fields

	r.Event(event)
	return nil
}
