package model

import (

	// "fmt"
	"github.com/TransX/cache"
	"github.com/TransX/constant"
	"github.com/TransX/log"
	"github.com/TransX/tscipher"
	"github.com/spf13/viper"
	"net"
	"time"
)

type Tunnel struct {
	id              string
	src             net.Conn
	dest            net.Conn
	cipherDirection constant.Direction
	regChan         chan interface{}
	unregChan       chan interface{}
	unregistered    bool
}

func NewTunnel(id string, src, dest net.Conn, cipherDirection constant.Direction) *Tunnel {
	return &Tunnel{
		id:              id,
		src:             src,
		dest:            dest,
		cipherDirection: cipherDirection,
		unregistered:    false,
	}
}

func (this *Tunnel) GetID() string {
	return this.id
}

func (this *Tunnel) SetID(id string) { //rarely used
	this.id = id
}

func (this *Tunnel) SetRegChan(c chan interface{}) {
	this.regChan = c
}

func (this *Tunnel) SetUnRegChan(c chan interface{}) {
	this.unregChan = c
}

//tunnel model : [ -->>server ---- client -->> ](this is a tunnel)
func (this *Tunnel) Run() { //单向的，从src发送到dest
	//进行注册
	this.regChan <- this
	src := this.src
	dest := this.dest
	id := this.id
	//构建Carrier
	queLength := viper.GetInt("queueLength")
	queCache := cache.NewBlockingQueueCache(queLength)
	cacheSize := viper.GetInt("cacheSize")
	for i := 0; i < queLength; i++ {
		queCache.Put(make([]byte, cacheSize), 0)
	}
	msg := cache.NewBlockingQueueCache(queLength)
	revCarrier := tscipher.NewCarrier(src, tscipher.NewCipher("XOR"), queCache, msg, id)
	sendCarrier := tscipher.NewCarrier(dest, tscipher.NewCipher("XOR"), queCache, msg, id)
	go this.receive(revCarrier)
	go this.send(sendCarrier)

}

func (this *Tunnel) onError() {
	src := this.src
	dest := this.dest
	//注销
	if !this.unregistered { // 应该不存在异步问题
		this.unregChan <- this
		this.unregistered = true
	}
	if r := recover(); r != nil {
		if src != nil {
			src.Close()
		}
		if dest != nil {
			dest.Close()
		}
	}
}

func (this *Tunnel) receive(revCarrier *tscipher.Carrier) {
	src := this.src
	cipherDirection := this.cipherDirection
	id := this.id
	defer this.onError()
	var n int
	var err error
	for {
		rTimer := time.Now() //receive timer
		if cipherDirection != constant.RECEIVE {
			revCarrier.Cipher = nil
			n, err = tscipher.RowReceiveData(revCarrier)
		} else {
			n, err = tscipher.ReceiveData(revCarrier)
		}
		log.Info("id %s time to receive %d", id, time.Since(rTimer)/1000)
		if err != nil {
			log.Panic("Read panic. Tunnel id: %s. Remote Add: %s Local: %s. Err:%s", id, src.RemoteAddr().String(), src.LocalAddr().String(), err.Error())
		}
		log.Debug("Reived %d bytes (local add %s) from %s. Tunnel: id %s", n, src.LocalAddr().String(), src.RemoteAddr().String(), id)
	}
}

func (this *Tunnel) send(sendCarrier *tscipher.Carrier) {
	dest := this.dest
	cipherDirection := this.cipherDirection
	id := this.id
	defer this.onError()
	if cipherDirection != constant.SEND {
		sendCarrier.Cipher = nil
	}
	for {
		sTimer := time.Now() //send timer
		n, err := tscipher.SendData(sendCarrier)
		log.Info("id %s time to send %d", id, time.Since(sTimer)/1000)
		if err != nil {
			log.Panic("Write panic. ID: %s, Err: %s, Remote Add: %s", id, err, dest.RemoteAddr().String())
		}
		log.Info("id %s Send %d bytes (local add %s),to %s", id, n, dest.LocalAddr().String(), dest.RemoteAddr().String())
	}
}