package main

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

//go:embed dist
var webUI embed.FS

func setReader(state string) error {
	// echo 'on' > '/sys/bus/usb/devices/1-1/power/control'  # or 'auto'
	switch state {
	case "auto", "on":
		return os.WriteFile("/sys/bus/usb/devices/1-1/power/control", []byte(state), 0)
	default:
		return fmt.Errorf("unknown state %q", state)
	}
}

func main() {
	setReader("on")
	http.Handle("/", http.FileServerFS(webUI))

	http.HandleFunc("POST /api/reader/{state}", func(w http.ResponseWriter, r *http.Request) {
		if err := setReader(r.PathValue("state")); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}
		w.Write([]byte("ok"))
	})

	log.Fatal(http.ListenAndServe("127.0.0.1:8000", nil))
}