package server

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

	"github.com/gorilla/websocket"
)

var upgrader = websocket.Upgrader{
	ReadBufferSize:  1024,
	WriteBufferSize: 1024,
	CheckOrigin: func(r *http.Request) bool {
		return strings.Contains(r.Host, "localhost")
	},
}

func newConnection(w http.ResponseWriter, r *http.Request) {
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		fmt.Fprintf(w, "An error has occured: %s.\n", err)
		return
	}
	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) {
	hostLocation := ":" + strconv.Itoa(port)
	http.HandleFunc("/ws", newConnection)

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