package server

import (
	"fmt"
	"log"
	"net/http"
	"strconv"
	"sync"

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
}

func newConnection(w http.ResponseWriter, r *http.Request) {
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		fmt.Fprint(w, "You must use the websocket protocol to connect to this endpoint.", err)
	}
	defer ws.Close()

	newSession(ws)
	for {
		_, p, err := ws.ReadMessage()
		if err != nil {
			disconnectSession(ws)
			break
		}

		msg := string(p)
		handleIncomingMessage(ws, msg)
	}
}

func StartServer(port int, wg *sync.WaitGroup) {
	defer wg.Done()

	hostLocation := ":" + strconv.Itoa(port)
	http.HandleFunc("/ws", newConnection)

	log.Fatal(http.ListenAndServe(hostLocation, nil))
}