package utils

import (
	"log"
	"net"
)

const ServerType = "tcp"

var ServerRunning = false
var client net.Conn

func Listen(address string) {
	server, err := net.Listen(ServerType, address)
	if err != nil {
		log.Fatal("error in create server ", err)
	}
	defer server.Close()
	log.Println("listen on ", address)
	for ServerRunning {
		conn, err := server.Accept()
		if err != nil {
			ServerRunning = false
			log.Fatalln("error in create connection ", err)
		}
		if client == nil {
			client = conn
		} else {
			log.Println("client already connected, close")
			conn.Close()
		}
	}
}

func Write(data string) {
	defer func() {
		client.Close()
		client = nil
	}()
	_, err := client.Write([]byte(data))
	if err != nil {
		log.Println("error in write data to client socket ", err)
		client.Close()
		client = nil
	}
}