package discovery

import (
	"fmt"
	"net"
	"os"
	"strings"
	"xtcfs/config"
)

// 分隔符
const separator = "|"

func Listen() {
	// 创建udp
	addr, err := net.ResolveUDPAddr("udp", config.G.LocalIP)
	ChkError(err)
	//
	conn, err := net.ListenUDP("updp", addr)
	ChkError(err)
	// 延迟关闭
	defer conn.Close()

	buf := make([]byte, 1024)
	for {
		//
		n, src, err := conn.ReadFromUDP(buf)

		remoteAddr := src.IP.String() + ":" + config.G.Port

		if err != nil {
			fmt.Printf("Failed to read from %s: %v\n", remoteAddr, err)
			continue
		}

		message := string(buf[:n])
		parts := strings.Split(message, separator)
		if len(parts) != 2 {
			fmt.Printf("Received malformed message from %s: %s\n", remoteAddr, message)
			continue
		}

		// 切割
		fmt.Print("parts from udp read :%v", parts)
	}
}

func ChkError(err error) {
	if err != nil {
		fmt.Fprint(os.Stderr, "Faltat error", err.Error())
		os.Exit(1)
	}
}