package server

import (
	"io"
	"sync"

	logging "git.loafle.net/commons/logging-go"
)

type ClientReadWriter struct {
	ReadwriteHandler ReadWriteHandler
	ReadChan         chan<- []byte
	WriteChan        <-chan []byte
	DisconnectedChan chan<- struct{}
	ReconnectedChan  <-chan *Conn
	ClientStopChan   <-chan struct{}
	ClientStopWg     *sync.WaitGroup
}

func (crw *ClientReadWriter) HandleConnection(conn *Conn) {

	defer func() {
		if nil != conn {
			conn.Close()
		}
		logging.Logger().Infof("disconnected")
		crw.ClientStopWg.Done()
	}()

	logging.Logger().Infof("connected")

	stopChan := make(chan struct{})

	readerDoneChan := make(chan error)
	writerDoneChan := make(chan error)

	var err error

	for {
		if nil != err {
			if io.EOF == err || io.ErrUnexpectedEOF == err {
				crw.DisconnectedChan <- struct{}{}
				newConn := <-crw.ReconnectedChan
				if nil == newConn {
					return
				}
				conn = newConn
			} else {
				return
			}
		}

		go connReadHandler(crw.ReadwriteHandler, conn, stopChan, readerDoneChan, crw.ReadChan)
		go connWriteHandler(crw.ReadwriteHandler, conn, stopChan, writerDoneChan, crw.WriteChan)

		select {
		case err = <-readerDoneChan:
			close(stopChan)
			<-writerDoneChan
		case err = <-writerDoneChan:
			close(stopChan)
			<-readerDoneChan
		case <-crw.ClientStopChan:
			close(stopChan)
			<-readerDoneChan
			<-writerDoneChan
			return
		}
	}
}