package frontend

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

	"github.com/gorilla/websocket"
)

//go:embed www
var staticFiles embed.FS

func home(w http.ResponseWriter, r *http.Request) {
	content, err := staticFiles.ReadFile("www/index.html")
	if err != nil {
		log.Printf("Could not Read file %v", err)
	}
	fmt.Fprintf(w, string(content))
}

var upgrader = websocket.Upgrader{} // use default options

type ValueChangeResp struct {
	Cmd   string `json:"cmd"`
	Name  string `json:"name"`
	Value string `json:"value"`
}

func echo(w http.ResponseWriter, r *http.Request) {

	type resp struct {
		Cmd string `json:"cmd"`
		Arg string `json:"arg"`
	}

	c, err := upgrader.Upgrade(w, r, nil)
	if err != nil {
		log.Print("upgrade:", err)
		return
	}
	defer c.Close()
	for {
		_, message, err := c.ReadMessage()
		if err != nil {
			log.Println("read:", err)
			break
		}
		log.Printf("recv: %s", message)

		jsonResp := resp{
			Cmd: "echo",
			Arg: string(message),
		}

		err = c.WriteJSON(jsonResp)
		if err != nil {
			log.Println("write:", err)
			break
		}
	}
}

func StartServer() {
	http.Handle("/www/", http.FileServer(http.FS(staticFiles)))
	http.HandleFunc("/", home)
	http.HandleFunc("/echo", echo)

	http.ListenAndServe("0.0.0.0:8000", nil)
}