package main

import (
	"context"
	"flag"
	"fmt"
	"github.com/BurntSushi/toml"
	"github.com/naleek/gortty"
	"log"
	"os"
	"strconv"
)

const (
	verMajor = 0
	verMinor = 1
	verPatch = 0
)

type config struct {
	Baud           float64           `toml:"baud"`
	StopBits       float64           `toml:"stopbits"`
	DataBits       int               `toml:"databits"`
	SampleRate     int               `toml:"samplerate"`
	MarkFrequency  int               `toml:"markfrequency"`
	SpaceFrequency int               `toml:"spacefrequency"`
	LocalEcho      bool              `toml:"localecho"`
	CodeSet        string            `toml:"codeset"`
	Registers      map[string]string `toml:"registers"`
}

func main() {

	var configFile string

	flag.StringVar(&configFile, "c", "rttymodem.toml", "Configuration file path")

	showHelp := flag.Bool("h", false, "Show usage and exit")
	showVersion := flag.Bool("v", false, "Show version and exit")

	flag.Parse()

	if *showHelp {
		flag.PrintDefaults()
		os.Exit(0)
	}

	if *showVersion {
		fmt.Printf("%d.%d.%d\n", verMajor, verMinor, verPatch)
		os.Exit(0)
	}

	log.Printf("starting up with config from %s")

	conf := &config{}

	if _, err := toml.DecodeFile(configFile, &conf); err != nil {
		log.Fatal(err)
	}

	s := &gortty.ModemSettings{
		Baud:       conf.Baud,
		StopBits:   conf.StopBits,
		DataBits:   conf.DataBits,
		SampleRate: conf.SampleRate,
		OneFreq:    conf.MarkFrequency,
		ZeroFreq:   conf.SpaceFrequency,
	}

	if conf.CodeSet == "" {
		conf.CodeSet = "USTTY"
	}

	c, err := gortty.LoadCodeSet(conf.CodeSet)
	if err != nil {
		log.Fatal(err)
	}

	ctx, cancel := context.WithCancel(context.Background())

	m, err := NewModem(ctx, s, c)
	if err != nil {
		log.Fatal(err)
	}

	m.SetLocalEcho(conf.LocalEcho)

	for i, r := range conf.Registers {
		n, err := strconv.Atoi(i)
		if err != nil {
			continue
		}
		m.SetRegister(n, r)
	}

	defer m.Close()

	m.run()

	cancel()
}