// 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"

	"strconv"

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

type NodeSystemStats struct {
	CPUUtilizationRate float64 `json:"cpu_utilization_rate"`
	SwapTotal          int64   `json:"swap_total"`
	SwapUsed           int64   `json:"swap_used"`
	MemTotal           int64   `json:"mem_total"`
	MemFree            int64   `json:"mem_free"`
}

type NodeInterestingStats struct {
	CmdGet                   int64 `json:"cmd_get"`
	CouchDocsActualDiskSize  int64 `json:"couch_docs_actual_disk_size"`
	CouchDocsDataSize        int64 `json:"couch_docs_data_size"`
	CouchSpatialDataSize     int64 `json:"couch_spatial_data_size"`
	CouchSpatialDiskSize     int64 `json:"couch_spatial_disk_size"`
	CouchViewsActualDiskSize int64 `json:"couch_views_actual_disk_size"`
	CouchViewsDataSize       int64 `json:"couch_views_data_size"`
	CurrItems                int64 `json:"curr_items"`
	CurrItemsTot             int64 `json:"curr_items_tot"`
	EpBgFetched              int64 `json:"ep_bg_fetched"`
	GetHits                  int64 `json:"get_hits"`
	MemUsed                  int64 `json:"mem_used"`
	Ops                      int64 `json:"ops"`
	VbReplicaCurrItems       int64 `json:"vb_replica_curr_items"`
}

type Node struct {
	SystemStats          NodeSystemStats      `json:"systemStats"`
	InterestingStats     NodeInterestingStats `json:"interestingStats"`
	Uptime               string               `json:"uptime"`
	MemoryTotal          int64                `json:"memoryTotal"`
	MemoryFree           int64                `json:"memoryFree"`
	McdMemoryReserved    int64                `json:"mcdMemoryReserved"`
	McdMemoryAllocated   int64                `json:"mcdMemoryAllocated"`
	ClusterMembership    string               `json:"clusterMembership"`
	RecoveryType         string               `json:"recoveryType"`
	Status               string               `json:"status"`
	ThisNode             bool                 `json:"thisNode"`
	Hostname             string               `json:"hostname"`
	ClusterCompatibility int64                `json:"clusterCompatibility"`
	Version              string               `json:"version"`
	Os                   string               `json:"os"`
}

type Data struct {
	Nodes []Node `json:"nodes"`
}

func eventsMapping(content []byte) []common.MapStr {
	var d Data
	err := json.Unmarshal(content, &d)
	if err != nil {
		logp.Err("Error: ", err)
	}

	events := []common.MapStr{}

	for _, NodeItem := range d.Nodes {
		uptime, _ := strconv.ParseInt(NodeItem.Uptime, 10, 64)

		event := common.MapStr{
			"cmd_get": NodeItem.InterestingStats.CmdGet,
			"couch": common.MapStr{
				"docs": common.MapStr{
					"disk_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchDocsActualDiskSize,
					},
					"data_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchDocsDataSize,
					},
				},
				"spatial": common.MapStr{
					"data_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchSpatialDataSize,
					},
					"disk_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchSpatialDiskSize,
					},
				},
				"views": common.MapStr{
					"disk_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchViewsActualDiskSize,
					},
					"data_size": common.MapStr{
						"bytes": NodeItem.InterestingStats.CouchViewsDataSize,
					},
				},
			},
			"cpu_utilization_rate": common.MapStr{
				"pct": NodeItem.SystemStats.CPUUtilizationRate,
			},
			"current_items": common.MapStr{
				"value": NodeItem.InterestingStats.CurrItems,
				"total": NodeItem.InterestingStats.CurrItemsTot,
			},
			"ep_bg_fetched": NodeItem.InterestingStats.EpBgFetched,
			"get_hits":      NodeItem.InterestingStats.GetHits,
			"hostname":      NodeItem.Hostname,
			"mcd_memory": common.MapStr{
				"reserved": common.MapStr{
					"bytes": NodeItem.McdMemoryReserved,
				},
				"allocated": common.MapStr{
					"bytes": NodeItem.McdMemoryAllocated,
				},
			},
			"memory": common.MapStr{
				"total": common.MapStr{
					"bytes": NodeItem.SystemStats.MemTotal,
				},
				"free": common.MapStr{
					"bytes": NodeItem.SystemStats.MemFree,
				},
				"used": common.MapStr{
					"bytes": NodeItem.InterestingStats.MemUsed,
				},
			},
			"ops": NodeItem.InterestingStats.Ops,
			"swap": common.MapStr{
				"total": common.MapStr{
					"bytes": NodeItem.SystemStats.SwapTotal,
				},
				"used": common.MapStr{
					"bytes": NodeItem.SystemStats.SwapUsed,
				},
			},
			"uptime": common.MapStr{
				"sec": uptime,
			},
			"vb_replica_curr_items": NodeItem.InterestingStats.VbReplicaCurrItems,
		}
		events = append(events, event)
	}

	return events
}