package main

import (
	"flag"
	"fmt"
	"log"
	"os"
)

const defaultBaud = 921600

func usage() {
	fmt.Fprintf(os.Stderr, "usage: gotool -port /dev/ttyUSB0 <command>\n\n")
	fmt.Fprintf(os.Stderr, "commands:\n")
	fmt.Fprintf(os.Stderr, "  version   firmware version and git hash\n")
	fmt.Fprintf(os.Stderr, "  clients   registered ESP-NOW slaves on the master\n\n")
	flag.PrintDefaults()
}

func main() {
	portName := flag.String("port", "", "serial port (e.g. /dev/ttyUSB0)")
	baud := flag.Int("baud", defaultBaud, "UART baud rate")
	flag.Parse()

	if *portName == "" || flag.NArg() < 1 {
		usage()
		os.Exit(2)
	}

	cmd := flag.Arg(0)

	sp, err := openSerial(*portName, *baud)
	if err != nil {
		log.Fatalf("open serial: %v", err)
	}
	defer sp.Close()

	var runErr error
	switch cmd {
	case "version":
		runErr = runVersion(sp)
	case "clients", "client-info":
		runErr = runClients(sp)
	default:
		fmt.Fprintf(os.Stderr, "unknown command %q\n\n", cmd)
		usage()
		os.Exit(2)
	}

	if runErr != nil {
		log.Fatal(runErr)
	}
}