// 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 dataservice

import (
	"path"
	"strconv"
	"sync"

	"github.com/milvus-io/milvus/internal/log"

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

type ParamTable struct {
	paramtable.BaseTable

	NodeID int64

	IP   string
	Port int

	// --- ETCD ---
	EtcdAddress             string
	MetaRootPath            string
	KvRootPath              string
	SegmentBinlogSubPath    string
	CollectionBinlogSubPath string
	SegmentDmlPosSubPath    string
	SegmentDdlPosSubPath    string
	DmlChannelPosSubPath    string
	DdlChannelPosSubPath    string

	// --- Pulsar ---
	PulsarAddress string

	FlushStreamPosSubPath string
	StatsStreamPosSubPath string

	// segment
	SegmentSize           float64
	SegmentSizeFactor     float64
	SegIDAssignExpiration int64

	InsertChannelPrefixName     string
	InsertChannelNum            int64
	StatisticsChannelName       string
	TimeTickChannelName         string
	DataNodeNum                 int
	SegmentInfoChannelName      string
	DataServiceSubscriptionName string
	K2SChannelNames             []string
	ProxyTimeTickChannelName    string

	SegmentFlushMetaPath string
	Log                  log.Config
}

var Params ParamTable
var once sync.Once

func (p *ParamTable) Init() {
	once.Do(func() {
		// load yaml
		p.BaseTable.Init()

		if err := p.LoadYaml("advanced/data_service.yaml"); err != nil {
			panic(err)
		}

		// set members
		p.initNodeID()

		p.initEtcdAddress()
		p.initMetaRootPath()
		p.initKvRootPath()
		p.initSegmentBinlogSubPath()
		p.initCollectionBinlogSubPath()

		p.initPulsarAddress()

		p.initSegmentSize()
		p.initSegmentSizeFactor()
		p.initSegIDAssignExpiration()
		p.initInsertChannelPrefixName()
		p.initInsertChannelNum()
		p.initStatisticsChannelName()
		p.initTimeTickChannelName()
		p.initDataNodeNum()
		p.initSegmentInfoChannelName()
		p.initDataServiceSubscriptionName()
		p.initK2SChannelNames()
		p.initSegmentFlushMetaPath()
		p.initLogCfg()
		p.initProxyServiceTimeTickChannelName()

		p.initFlushStreamPosSubPath()
		p.initStatsStreamPosSubPath()
		p.initSegmentDmlPosSubPath()
		p.initSegmentDdlPosSubPath()
	})
}

func (p *ParamTable) initNodeID() {
	p.NodeID = p.ParseInt64("dataservice.nodeID")
}

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

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

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) initKvRootPath() {
	rootPath, err := p.Load("etcd.rootPath")
	if err != nil {
		panic(err)
	}
	subPath, err := p.Load("etcd.kvSubPath")
	if err != nil {
		panic(err)
	}
	p.KvRootPath = rootPath + "/" + subPath
}

func (p *ParamTable) initSegmentBinlogSubPath() {
	subPath, err := p.Load("etcd.segmentBinlogSubPath")
	if err != nil {
		panic(err)
	}
	p.SegmentBinlogSubPath = subPath
}

func (p *ParamTable) initCollectionBinlogSubPath() {
	subPath, err := p.Load("etcd.collectionBinlogSubPath")
	if err != nil {
		panic(err)
	}
	p.CollectionBinlogSubPath = subPath
}

func (p *ParamTable) initSegmentSize() {
	p.SegmentSize = p.ParseFloat("dataservice.segment.size")
}

func (p *ParamTable) initSegmentSizeFactor() {
	p.SegmentSizeFactor = p.ParseFloat("dataservice.segment.sizeFactor")
}

func (p *ParamTable) initSegIDAssignExpiration() {
	p.SegIDAssignExpiration = p.ParseInt64("dataservice.segment.IDAssignExpiration") //ms
}

func (p *ParamTable) initInsertChannelPrefixName() {
	var err error
	p.InsertChannelPrefixName, err = p.Load("msgChannel.chanNamePrefix.dataServiceInsertChannel")
	if err != nil {
		panic(err)
	}
}

func (p *ParamTable) initInsertChannelNum() {
	p.InsertChannelNum = p.ParseInt64("dataservice.insertChannelNum")
}

func (p *ParamTable) initStatisticsChannelName() {
	var err error
	p.StatisticsChannelName, err = p.Load("msgChannel.chanNamePrefix.dataServiceStatistic")
	if err != nil {
		panic(err)
	}
}

func (p *ParamTable) initTimeTickChannelName() {
	var err error
	p.TimeTickChannelName, err = p.Load("msgChannel.chanNamePrefix.dataServiceTimeTick")
	if err != nil {
		panic(err)
	}
}

func (p *ParamTable) initDataNodeNum() {
	p.DataNodeNum = p.ParseInt("dataservice.dataNodeNum")
}

func (p *ParamTable) initSegmentInfoChannelName() {
	var err error
	p.SegmentInfoChannelName, err = p.Load("msgChannel.chanNamePrefix.dataServiceSegmentInfo")
	if err != nil {
		panic(err)
	}
}

func (p *ParamTable) initDataServiceSubscriptionName() {
	var err error
	p.DataServiceSubscriptionName, err = p.Load("msgChannel.subNamePrefix.dataServiceSubNamePrefix")
	if err != nil {
		panic(err)
	}
}

func (p *ParamTable) initK2SChannelNames() {
	prefix, err := p.Load("msgChannel.chanNamePrefix.k2s")
	if err != nil {
		panic(err)
	}
	prefix += "-"
	iRangeStr, err := p.Load("msgChannel.channelRange.k2s")
	if err != nil {
		panic(err)
	}
	channelIDs := paramtable.ConvertRangeToIntSlice(iRangeStr, ",")
	var ret []string
	for _, ID := range channelIDs {
		ret = append(ret, prefix+strconv.Itoa(ID))
	}
	p.K2SChannelNames = ret
}

func (p *ParamTable) initSegmentFlushMetaPath() {
	subPath, err := p.Load("etcd.segFlushMetaSubPath")
	if err != nil {
		panic(err)
	}
	p.SegmentFlushMetaPath = subPath
}

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, "dataservice-"+strconv.FormatInt(p.NodeID, 10)+".log")
	} else {
		p.Log.File.Filename = ""
	}
}

func (p *ParamTable) initProxyServiceTimeTickChannelName() {
	ch, err := p.Load("msgChannel.chanNamePrefix.proxyServiceTimeTick")
	if err != nil {
		panic(err)
	}
	p.ProxyTimeTickChannelName = ch
}

func (p *ParamTable) initFlushStreamPosSubPath() {
	subPath, err := p.Load("etcd.flushStreamPosSubPath")
	if err != nil {
		panic(err)
	}
	p.FlushStreamPosSubPath = subPath
}

func (p *ParamTable) initStatsStreamPosSubPath() {
	subPath, err := p.Load("etcd.statsStreamPosSubPath")
	if err != nil {
		panic(err)
	}
	p.StatsStreamPosSubPath = subPath
}

func (p *ParamTable) initSegmentDmlPosSubPath() {
	subPath, err := p.Load("etcd.segmentDmlPosSubPath")
	if err != nil {
		panic(err)
	}
	p.SegmentDmlPosSubPath = subPath
}

func (p *ParamTable) initSegmentDdlPosSubPath() {
	subPath, err := p.Load("etcd.segmentDdlPosSubPath")
	if err != nil {
		panic(err)
	}
	p.SegmentDdlPosSubPath = subPath
}

func (p *ParamTable) initDmlChannelPosSubPath() {
	subPath, err := p.Load("etcd.dmlChanPosSubPath")
	if err != nil {
		panic(err)
	}
	p.DmlChannelPosSubPath = subPath
}

func (p *ParamTable) initDdlChannelPosSubPath() {
	subPath, err := p.Load("etcd.ddlChanPosSubPath")
	if err != nil {
		panic(err)
	}
	p.DdlChannelPosSubPath = subPath
}