package main

import (
	"cidebug/pkg/iowrappers"
	"cidebug/pkg/websocketutil"
	"github.com/gorilla/websocket"
	"log"
	"net"
	"os"
	"time"
)

func closeConnection(conn net.Conn) {
	if tcpConn, ok := conn.(*net.TCPConn); ok {
		tcpConn.SetLinger(0)
	}
	_ = conn.Close()
}

func handleConnection(conn net.Conn, wsURL string) {
	defer closeConnection(conn)

	log.Printf("Connecting to '%s'\n", wsURL)
	_wsConn, _, err := websocket.DefaultDialer.Dial(wsURL, nil)
	if err != nil {
		log.Println("WebSocket connection error:", err)
		return
	}
	_wsConn.SetReadDeadline(time.Time{})
	_wsConn.SetWriteDeadline(time.Time{})
	wsConn := websocketutil.NewWebSocketConn(_wsConn)
	defer wsConn.Close()

	iowrappers.SynchronizeStreams(wsConn, conn)
}

func main() {
	tcpPort := os.Args[1]
	wsURL := os.Args[2]

	listener, err := net.Listen("tcp", ":"+tcpPort)
	if err != nil {
		log.Fatal(err)
	}
	defer listener.Close()

	log.Printf("TCP server listening on port %s\n", tcpPort)
	log.Printf("Forwarding connections to WebSocket server at %s\n", wsURL)

	for {
		conn, err := listener.Accept()
		if err != nil {
			log.Println(err)
			continue
		}
		go handleConnection(conn, wsURL)
	}
}