// Copyright (C) 2019-2020 Zilliz. All rights reserved.
//
// 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 querynode

import (
	"fmt"
	"os"
	"path"
	"strconv"
	"sync"

	"github.com/milvus-io/milvus/internal/log"
	"github.com/milvus-io/milvus/internal/util/paramtable"
)

type ParamTable struct {
	paramtable.BaseTable

	PulsarAddress string
	ETCDAddress   string
	MetaRootPath  string

	QueryNodeIP              string
	QueryNodePort            int64
	QueryNodeID              UniqueID
	QueryNodeNum             int
	QueryTimeTickChannelName string

	FlowGraphMaxQueueLength int32
	FlowGraphMaxParallelism int32

	// minio
	MinioEndPoint        string
	MinioAccessKeyID     string
	MinioSecretAccessKey string
	MinioUseSSLStr       bool
	MinioBucketName      string

	// search
	SearchReceiveBufSize       int64
	SearchPulsarBufSize        int64
	SearchResultReceiveBufSize int64

	// stats
	StatsPublishInterval int
	StatsChannelName     string

	GracefulTime      int64
	MsgChannelSubName string
	SliceIndex        int

	Log log.Config
}

var Params ParamTable
var once sync.Once

func (p *ParamTable) Init() {
	once.Do(func() {
		p.BaseTable.Init()
		err := p.LoadYaml("advanced/query_node.yaml")
		if err != nil {
			panic(err)
		}

		queryNodeIDStr := os.Getenv("QUERY_NODE_ID")
		if queryNodeIDStr == "" {
			queryNodeIDList := p.QueryNodeIDList()
			if len(queryNodeIDList) <= 0 {
				queryNodeIDStr = "0"
			} else {
				queryNodeIDStr = strconv.Itoa(int(queryNodeIDList[0]))
			}
		}

		err = p.Save("_queryNodeID", queryNodeIDStr)
		if err != nil {
			panic(err)
		}

		p.initQueryNodeID()
		p.initQueryNodeNum()
		//p.initQueryTimeTickChannelName()

		p.initMinioEndPoint()
		p.initMinioAccessKeyID()
		p.initMinioSecretAccessKey()
		p.initMinioUseSSLStr()
		p.initMinioBucketName()

		p.initPulsarAddress()
		p.initETCDAddress()
		p.initMetaRootPath()

		p.initGracefulTime()
		p.initMsgChannelSubName()
		p.initSliceIndex()

		p.initFlowGraphMaxQueueLength()
		p.initFlowGraphMaxParallelism()

		p.initSearchReceiveBufSize()
		p.initSearchPulsarBufSize()
		p.initSearchResultReceiveBufSize()

		p.initStatsPublishInterval()
		//p.initStatsChannelName()

		p.initLogCfg()
	})
}

// ---------------------------------------------------------- query node
func (p *ParamTable) initQueryNodeID() {
	queryNodeID, err := p.Load("_queryNodeID")
	if err != nil {
		panic(err)
	}
	id, err := strconv.Atoi(queryNodeID)
	if err != nil {
		panic(err)
	}
	p.QueryNodeID = UniqueID(id)
}

func (p *ParamTable) initQueryNodeNum() {
	p.QueryNodeNum = len(p.QueryNodeIDList())
}

func (p *ParamTable) initQueryTimeTickChannelName() {
	ch, err := p.Load("msgChannel.chanNamePrefix.queryTimeTick")
	if err != nil {
		log.Error(err.Error())
	}
	p.QueryTimeTickChannelName = ch
}

// ---------------------------------------------------------- minio
func (p *ParamTable) initMinioEndPoint() {
	url, err := p.Load("_MinioAddress")
	if err != nil {
		panic(err)
	}
	p.MinioEndPoint = url
}

func (p *ParamTable) initMinioAccessKeyID() {
	id, err := p.Load("minio.accessKeyID")
	if err != nil {
		panic(err)
	}
	p.MinioAccessKeyID = id
}

func (p *ParamTable) initMinioSecretAccessKey() {
	key, err := p.Load("minio.secretAccessKey")
	if err != nil {
		panic(err)
	}
	p.MinioSecretAccessKey = key
}

func (p *ParamTable) initMinioUseSSLStr() {
	ssl, err := p.Load("minio.useSSL")
	if err != nil {
		panic(err)
	}
	sslBoolean, err := strconv.ParseBool(ssl)
	if err != nil {
		panic(err)
	}
	p.MinioUseSSLStr = sslBoolean
}

func (p *ParamTable) initMinioBucketName() {
	bucketName, err := p.Load("minio.bucketName")
	if err != nil {
		panic(err)
	}
	p.MinioBucketName = bucketName
}

func (p *ParamTable) initPulsarAddress() {
	url, err := p.Load("_PulsarAddress")
	if err != nil {
		panic(err)
	}
	p.PulsarAddress = url
}

// advanced params
// stats
func (p *ParamTable) initStatsPublishInterval() {
	p.StatsPublishInterval = p.ParseInt("queryNode.stats.publishInterval")
}

// dataSync:
func (p *ParamTable) initFlowGraphMaxQueueLength() {
	p.FlowGraphMaxQueueLength = p.ParseInt32("queryNode.dataSync.flowGraph.maxQueueLength")
}

func (p *ParamTable) initFlowGraphMaxParallelism() {
	p.FlowGraphMaxParallelism = p.ParseInt32("queryNode.dataSync.flowGraph.maxParallelism")
}

// msgStream
func (p *ParamTable) initSearchReceiveBufSize() {
	p.SearchReceiveBufSize = p.ParseInt64("queryNode.msgStream.search.recvBufSize")
}

func (p *ParamTable) initSearchPulsarBufSize() {
	p.SearchPulsarBufSize = p.ParseInt64("queryNode.msgStream.search.pulsarBufSize")
}

func (p *ParamTable) initSearchResultReceiveBufSize() {
	p.SearchResultReceiveBufSize = p.ParseInt64("queryNode.msgStream.searchResult.recvBufSize")
}

func (p *ParamTable) initETCDAddress() {
	ETCDAddress, err := p.Load("_EtcdAddress")
	if err != nil {
		panic(err)
	}
	p.ETCDAddress = ETCDAddress
}

func (p *ParamTable) initMetaRootPath() {
	rootPath, err := p.Load("etcd.rootPath")
	if err != nil {
		panic(err)
	}
	subPath, err := p.Load("etcd.metaSubPath")
	if err != nil {
		panic(err)
	}
	p.MetaRootPath = rootPath + "/" + subPath
}

func (p *ParamTable) initGracefulTime() {
	p.GracefulTime = p.ParseInt64("queryNode.gracefulTime")
}

func (p *ParamTable) initMsgChannelSubName() {
	// TODO: subName = namePrefix + "-" + queryNodeID, queryNodeID is assigned by master
	name, err := p.Load("msgChannel.subNamePrefix.queryNodeSubNamePrefix")
	if err != nil {
		log.Error(err.Error())
	}
	queryNodeIDStr, err := p.Load("_QueryNodeID")
	if err != nil {
		panic(err)
	}
	p.MsgChannelSubName = name + "-" + queryNodeIDStr
}

func (p *ParamTable) initStatsChannelName() {
	channels, err := p.Load("msgChannel.chanNamePrefix.queryNodeStats")
	if err != nil {
		panic(err)
	}
	p.StatsChannelName = channels
}

func (p *ParamTable) initSliceIndex() {
	queryNodeID := p.QueryNodeID
	queryNodeIDList := p.QueryNodeIDList()
	for i := 0; i < len(queryNodeIDList); i++ {
		if queryNodeID == queryNodeIDList[i] {
			p.SliceIndex = i
			return
		}
	}
	p.SliceIndex = -1
}

func (p *ParamTable) initLogCfg() {
	p.Log = log.Config{}
	format, err := p.Load("log.format")
	if err != nil {
		panic(err)
	}
	p.Log.Format = format
	level, err := p.Load("log.level")
	if err != nil {
		panic(err)
	}
	p.Log.Level = level
	devStr, err := p.Load("log.dev")
	if err != nil {
		panic(err)
	}
	dev, err := strconv.ParseBool(devStr)
	if err != nil {
		panic(err)
	}
	p.Log.Development = dev
	p.Log.File.MaxSize = p.ParseInt("log.file.maxSize")
	p.Log.File.MaxBackups = p.ParseInt("log.file.maxBackups")
	p.Log.File.MaxDays = p.ParseInt("log.file.maxAge")
	rootPath, err := p.Load("log.file.rootPath")
	if err != nil {
		panic(err)
	}
	if len(rootPath) != 0 {
		p.Log.File.Filename = path.Join(rootPath, fmt.Sprintf("querynode-%d.log", p.QueryNodeID))
	} else {
		p.Log.File.Filename = ""
	}
}