package main

import (
	"flag"
	"log"
	"net/http"
	"net/url"
	"os"
	"os/signal"
	"time"

	"github.com/gorilla/websocket"
)

var addr = flag.String("addr", "trans.college.360.cn", "http service address")

func main() {
	flag.Parse()
	log.SetFlags(0)

	interrupt := make(chan os.Signal, 1)
	signal.Notify(interrupt, os.Interrupt)

	u := url.URL{
		Scheme: "wss", 
		Host: *addr, 
		Path: "/ws", 
		RawQuery: "live_course_id=10114"
	}
	log.Printf("connecting to %s", u.String())


	header := make(http.Header)
	header["Origin"] = []string{"https://admin.college.360.cn"}
	header["User-Agent"] = []string{"Chrome/80.0.3987.122"}
	header["Cookie"] = []string{"your cookie"}

	dialer := websocket.DefaultDialer
	dialer.EnableCompression = true
	c, _, err := dialer.Dial(u.String(), header)
	if err != nil {
		log.Fatal("dial:", err)
	}
	defer c.Close()

	done := make(chan struct{})

	go func() {
		defer close(done)
		for {
			_, message, err := c.ReadMessage()
			if err != nil {
				log.Println("read:", err)
				return
			}
			log.Printf("recv: %s", message)
		}
	}()

	ticker := time.NewTicker(1)
	defer ticker.Stop()

	for {
		select {
		case <-done:
			return
		case <-ticker.C:
			err := c.WriteMessage(websocket.TextMessage, []byte(
					"{\"cmd\":\"newMessage\",\"message\":\"感谢360\"}"
				))
			if err != nil {
				log.Println("write:", err)
				return
			}
		case <-interrupt:
			log.Println("interrupt")
			err := c.WriteMessage(
				websocket.CloseMessage, 
				websocket.FormatCloseMessage(
					websocket.CloseNormalClosure, ""
				)
			)
			if err != nil {
				log.Println("write close:", err)
				return
			}
			select {
			case <-done:
			case <-time.After(time.Second):
			}
			return
		}
	}
}