package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"time"

	"github.com/gorilla/websocket"
)

func homePage(w http.ResponseWriter, r *http.Request) {
	b, _ := ioutil.ReadFile("./index.html")
	fmt.Fprintf(w, "%s", b)
}

func setupRoutes() {
	http.HandleFunc("/", homePage)
	http.HandleFunc("/ws", wsEndpoint)
}

func main() {
	fmt.Println("Hello World")
	setupRoutes()
	log.Fatal(http.ListenAndServe(":8080", nil))
}

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

func reader(conn *websocket.Conn) {
	for {
		// read in a message
		messageType, p, err := conn.ReadMessage()
		if err != nil {
			log.Println(err)
			return
		}
		// print out that message for clarity
		fmt.Println(string(p))

		if err := conn.WriteMessage(messageType, p); err != nil {
			log.Println(err)
			return
		}

	}
}
func wsEndpoint(w http.ResponseWriter, r *http.Request) {
	upgrader.CheckOrigin = func(r *http.Request) bool { return true }

	// upgrade this connection to a WebSocket
	// connection
	ws, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Println(err)
	}

	log.Println("Client Connected")
	// listen indefinitely for new messages coming
	// through on our WebSocket connection
	go reader(ws)
	for {
		log.Println("writing...")
		err = ws.WriteMessage(1, []byte("Hi Client!"))
		log.Println("written")
		if err != nil {
			log.Println(err)
			return
		}
		time.Sleep(time.Second)
	}
}