// 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

import (
	"encoding/json"

	"github.com/joeshaw/multierror"
	"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/elasticsearch"
)

var (
	schema = s.Schema{
		"name":    c.Str("name"),
		"version": c.Str("version"),
		"jvm": c.Dict("jvm", s.Schema{
			"version": c.Str("version"),
			"memory": c.Dict("mem", s.Schema{
				"heap": s.Object{
					"init": s.Object{
						"bytes": c.Int("heap_init_in_bytes"),
					},
					"max": s.Object{
						"bytes": c.Int("heap_max_in_bytes"),
					},
				},
				"nonheap": s.Object{
					"init": s.Object{
						"bytes": c.Int("non_heap_init_in_bytes"),
					},
					"max": s.Object{
						"bytes": c.Int("non_heap_max_in_bytes"),
					},
				},
			}),
		}),
		"process": c.Dict("process", s.Schema{
			"mlockall": c.Bool("mlockall"),
		}),
	}
)

func eventsMapping(r mb.ReporterV2, content []byte) error {
	nodesStruct := struct {
		ClusterName string                            `json:"cluster_name"`
		Nodes       map[string]map[string]interface{} `json:"nodes"`
	}{}

	err := json.Unmarshal(content, &nodesStruct)
	if err != nil {
		err = errors.Wrap(err, "failure parsing Elasticsearch Node Stats API response")
		r.Error(err)
		return err
	}

	var errs multierror.Errors
	for name, node := range nodesStruct.Nodes {
		event := mb.Event{}
		event.MetricSetFields, err = schema.Apply(node)
		if err != nil {
			errs = append(errs, errors.Wrap(err, "failure applying node schema"))
		}

		// Write name here as full name only available as key
		event.MetricSetFields["name"] = name

		event.ModuleFields = common.MapStr{}
		event.ModuleFields.Put("cluster.name", nodesStruct.ClusterName)

		event.RootFields = common.MapStr{}
		event.RootFields.Put("service.name", elasticsearch.ModuleName)

		r.Event(event)
	}

	return errs.Err()
}