// 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 rootcoord

import (
	"path"
	"strings"
	"sync"

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

var Params ParamTable
var once sync.Once

type ParamTable struct {
	paramtable.BaseTable

	Address string
	Port    int

	PulsarAddress     string
	RocksmqPath       string
	EtcdEndpoints     []string
	MetaRootPath      string
	KvRootPath        string
	MsgChannelSubName string
	TimeTickChannel   string
	StatisticsChannel string

	MaxPartitionNum             int64
	DefaultPartitionName        string
	DefaultIndexName            string
	MinSegmentSizeToEnableIndex int64

	Timeout          int
	TimeTickInterval int

	Log log.Config

	RoleName string
}

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

		p.initPulsarAddress()
		p.initRocksmqPath()
		p.initEtcdEndpoints()
		p.initMetaRootPath()
		p.initKvRootPath()

		p.initMsgChannelSubName()
		p.initTimeTickChannel()
		p.initStatisticsChannelName()

		p.initMaxPartitionNum()
		p.initMinSegmentSizeToEnableIndex()
		p.initDefaultPartitionName()
		p.initDefaultIndexName()

		p.initTimeout()
		p.initTimeTickInterval()

		p.initLogCfg()
		p.initRoleName()
	})
}

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

func (p *ParamTable) initRocksmqPath() {
	path, err := p.Load("_RocksmqPath")
	if err != nil {
		panic(err)
	}
	p.RocksmqPath = path
}

func (p *ParamTable) initEtcdEndpoints() {
	endpoints, err := p.Load("_EtcdEndpoints")
	if err != nil {
		panic(err)
	}
	p.EtcdEndpoints = strings.Split(endpoints, ",")
}

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) initMsgChannelSubName() {
	name, err := p.Load("msgChannel.subNamePrefix.rootCoordSubNamePrefix")
	if err != nil {
		panic(err)
	}
	p.MsgChannelSubName = name
}

func (p *ParamTable) initTimeTickChannel() {
	channel, err := p.Load("msgChannel.chanNamePrefix.rootCoordTimeTick")
	if err != nil {
		panic(err)
	}
	p.TimeTickChannel = channel
}

func (p *ParamTable) initStatisticsChannelName() {
	channel, err := p.Load("msgChannel.chanNamePrefix.rootCoordStatistics")
	if err != nil {
		panic(err)
	}
	p.StatisticsChannel = channel
}

func (p *ParamTable) initMaxPartitionNum() {
	p.MaxPartitionNum = p.ParseInt64("rootcoord.maxPartitionNum")
}

func (p *ParamTable) initMinSegmentSizeToEnableIndex() {
	p.MinSegmentSizeToEnableIndex = p.ParseInt64("rootcoord.minSegmentSizeToEnableIndex")
}

func (p *ParamTable) initDefaultPartitionName() {
	name, err := p.Load("common.defaultPartitionName")
	if err != nil {
		panic(err)
	}
	p.DefaultPartitionName = name
}

func (p *ParamTable) initDefaultIndexName() {
	name, err := p.Load("common.defaultIndexName")
	if err != nil {
		panic(err)
	}
	p.DefaultIndexName = name
}

func (p *ParamTable) initTimeout() {
	p.Timeout = p.ParseInt("rootcoord.timeout")
}

func (p *ParamTable) initTimeTickInterval() {
	p.TimeTickInterval = p.ParseInt("rootcoord.timeTickInterval")
}

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
	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, "rootcoord.log")
	} else {
		p.Log.File.Filename = ""
	}
}

func (p *ParamTable) initRoleName() {
	p.RoleName = "RootCoord"
}