package main

import (
	"io"
	"log"
	"net/http"

	"github.com/gorilla/websocket"
)

type WS struct {
	upgrader websocket.Upgrader
}

func NewWS() *WS {
	return &WS{
		upgrader: websocket.Upgrader{
			ReadBufferSize:  10240,
			WriteBufferSize: 10240,
			CheckOrigin:     func(_ *http.Request) bool { return true },
		},
	}
}

func (ws *WS) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	if err := ws.serveHTTP(w, r); err != nil {
		log.Println(r.URL.Path, err)
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func (ws *WS) serveHTTP(w http.ResponseWriter, r *http.Request) error {
	conn, err := ws.upgrader.Upgrade(w, r, nil)
	if err != nil {
		return err
	}
	for {
		mt, r, err := conn.NextReader()
		if err != nil {
			return err
		}
		w, err := conn.NextWriter(mt)
		if err != nil {
			return err
		}
		if _, err := io.Copy(w, r); err != nil { // todo impl broadcast to channel;; sync map to all channels, goes to a forking reader-writer pipe, all listeners to broadcast read from pipe
			return err
		}
		if err := w.Close(); err != nil {
			return err
		}
	}
}