// 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 grpcdatanode

import (
	"net"
	"sync"

	"github.com/milvus-io/milvus/internal/log"
	"github.com/milvus-io/milvus/internal/util/funcutil"
	"github.com/milvus-io/milvus/internal/util/paramtable"
	"go.uber.org/zap"
)

var Params ParamTable
var once sync.Once

type ParamTable struct {
	paramtable.BaseTable

	IP       string
	Port     int
	listener net.Listener

	MasterAddress      string
	DataServiceAddress string
}

func (pt *ParamTable) Init() {
	once.Do(func() {
		pt.BaseTable.Init()
		pt.initMasterAddress()
		pt.initDataServiceAddress()
		pt.initPort()
	})
}

func (pt *ParamTable) LoadFromArgs() {

}

func (pt *ParamTable) LoadFromEnv() {
	Params.IP = funcutil.GetLocalIP()
}

func (pt *ParamTable) initPort() {

	listener, err := net.Listen("tcp", ":0")
	if err != nil {
		panic(err)
	}

	pt.Port = listener.Addr().(*net.TCPAddr).Port
	pt.listener = listener
	log.Info("DataNode", zap.Int("port", pt.Port))
}

func (pt *ParamTable) initMasterAddress() {
	ret, err := pt.Load("_MasterAddress")
	if err != nil {
		panic(err)
	}
	pt.MasterAddress = ret
}

func (pt *ParamTable) initDataServiceAddress() {
	ret, err := pt.Load("_DataServiceAddress")
	if err != nil {
		panic(err)
	}
	pt.DataServiceAddress = ret
}