package main

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

	"github.com/gorilla/websocket"
)

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

func websocketConnection(w http.ResponseWriter, r *http.Request) {
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		fmt.Fprintf(w, "Internal server error: %s", err)
		fmt.Printf("Internal server error: %s", err)
		return
	}

	defer ws.Close()

	ws.WriteMessage(websocket.TextMessage, []byte("nickname"))

	for {
		_, p, err := ws.ReadMessage()
		if err != nil {
			handleDisconnection(ws)
			if websocket.IsUnexpectedCloseError(err, websocket.CloseGoingAway, websocket.CloseAbnormalClosure) {
				log.Printf("error: %v", err)
			}
			break
		}

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

func main() {
	http.HandleFunc("/websocket", websocketConnection)
	http.Handle("/", http.FileServer(http.Dir("./static")))

	http.ListenAndServe(":8080", nil)
}