package main

import (
	"errors"
	"flag"
	"fmt"
	"path/filepath"

	"log"
	"os"
	"os/signal"
	"syscall"

	"github.com/jroimartin/gocui"
	"github.com/karanveersp/store"
	"gopkg.in/yaml.v2"
)

const usage = `Usage of ptb - the PACTOR-IP-Bridge:
  -c, --configfile string   Name of config file (default "Config.yaml")
  -d, --daemon              Daemon mode (no TUI)
  -l, --logfile string      Path to the log file
`

const (
	StatusTCPCmdActive  uint8 = 1 << iota //00000001
	StatusTCPDataActive                   //00000010
)

type TCPServer struct {
	Protocol        chan string
	ToPactor        *ByteFIFO
	FromPactor      *ByteFIFO
	ToTRX           *ByteFIFO
	FromTRX         *ByteFIFO
	VARAMode        bool
	DaemonMode      bool
	GPSdMode        bool
	NMEAPassthrough bool
	DeviceType      string
	Status          uint8
	Command         struct {
		Cmd      *StringFIFO
		Response *StringFIFO
	}
	Data struct {
		Data     *ByteFIFO
		Response *ByteFIFO
	}
	GPSStream *StringFIFO // NMEA steam from PTC to gpsd server, see gpsd.go
}

func NewTCPServer(varamode bool, daemonmode bool, gpsdmode bool, nmeapassthrough bool) *TCPServer {
	return &TCPServer{
		Protocol:        make(chan string, 1024),
		ToPactor:        NewByteFIFO(1024),
		FromPactor:      NewByteFIFO(1024),
		ToTRX:           NewByteFIFO(1024),
		FromTRX:         NewByteFIFO(1024),
		VARAMode:        varamode,
		DaemonMode:      daemonmode,
		GPSdMode:        gpsdmode,
		NMEAPassthrough: nmeapassthrough,
		DeviceType:      "",
		Status:          0,
		Command: struct {
			Cmd      *StringFIFO
			Response *StringFIFO
		}{Cmd: NewStringFIFO(), Response: NewStringFIFO()},
		Data: struct {
			Data     *ByteFIFO
			Response *ByteFIFO
		}{Data: NewByteFIFO(10240), Response: NewByteFIFO(10240)},
		GPSStream: NewStringFIFO(),
	}
}

type Userconfig struct {
	Device            string `yaml:"device"`
	Baudrate          int    `yaml:"baudrate"`
	Mycall            string `yaml:"mycall"`
	ServerAddress     string `yaml:"server_address"`
	DataAddress       string `yaml:"data_address"`
	GPSdAddress       string `yaml:"gpsd_address"`
	NMEAPassthrough   bool   `yaml:"nmeapassthrough"`
	CmdLineInit       string `yaml:"cmdline_init"`
	StartwithVaraMode bool   `yaml:"vara_mode"`
}

func configmanage(Config *Userconfig, path string) error {
	cf := store.GetApplicationDirPath() + string(os.PathSeparator) + path

	_, err := os.Stat(cf)
	if err != nil {
		log.Println("loadConfig error:", err)
		log.Println("Config file not found. Creating new one")
		Config = &Userconfig{Device: "/tmp/ttyUSB0",
			Baudrate:          9600,
			Mycall:            "N0CALL",
			ServerAddress:     "127.0.0.1:8300",
			DataAddress:       "127.0.0.1:8301",
			GPSdAddress:       "",
			NMEAPassthrough:   false,
			CmdLineInit:       "",
			StartwithVaraMode: false}

		if err := store.Save("Config.yaml", Config); err != nil {
			log.Println("failed to save the Config file: ", err)
			return err
		}
		return errors.New(fmt.Sprintf("new Config file %s created. Please edit the Config file and restart the application", cf))

	}
	if err := store.Load(path, Config); err != nil {
		return err
	}

	if Config.Device != "" {
		//log.Println("Config loaded:", Config)
		return nil
	}
	return errors.New(fmt.Sprintf("Empty device name in Config file. Please edit the Config file %s and restart the application", cf))
}

func init() {
	store.Init("dl1thm.pactortcpbridge")
	store.Register("ini", yaml.Marshal, yaml.Unmarshal)
}

var s *TCPServer // s is a pointer to TCPServer, managing communication via channels and FIFO queues for command and data handling.

func main() {

	tmpfile := filepath.FromSlash(os.TempDir() + "/ptb.log")

	// read command line arguments -- the standard flag module unfortunately doesn't know shorthands
	var configfile string
	flag.StringVar(&configfile, "configfile", "Config.yaml", "Name of config file")
	flag.StringVar(&configfile, "c", "Config.yaml", "Name of config file")
	var logfile string
	flag.StringVar(&logfile, "logfile", tmpfile, "Name of log file")
	flag.StringVar(&logfile, "l", tmpfile, "Name of log file")
	var daemonMode bool
	flag.BoolVar(&daemonMode, "daemon", false, "Daemon mode (no TUI)")
	flag.BoolVar(&daemonMode, "d", false, "Daemon mode (no TUI)")
	flag.Usage = func() { fmt.Print(usage) }

	flag.Parse()

	f, err := os.OpenFile(logfile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		log.Fatalf("error opening file: %v", err)
	}
	defer f.Close()

	log.SetOutput(f)
	fmt.Println("logging to " + logfile)

	// read config
	var Config Userconfig
	//c := store.GetApplicationDirPath()
	err = configmanage(&Config, configfile)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}

	s = NewTCPServer(Config.StartwithVaraMode, daemonMode, Config.GPSdAddress != "", Config.NMEAPassthrough)
	fmt.Println("Initializing PACTOR modem, please wait...")
	m, err := OpenModem(Config.Device, Config.Baudrate, Config.Mycall, "", Config.CmdLineInit)
	if err != nil {
		log.Panicln(err)
	}
	defer m.Close()

	go tcpCmdServer(&Config)
	go tcpDataServer(&Config)

	if Config.GPSdAddress != "" {
		go startGPSdTCPServer(Config.GPSdAddress)
		go readAndBroadcast()
	}

	if true { // TODO: later change to Config
		go trxControl()
	}

	if !daemonMode {
		// Initialize the gocui GUI
		g, err := gocui.NewGui(gocui.OutputNormal)
		if err != nil {
			log.Panicln(err)
		}
		defer g.Close()

		g.SetManagerFunc(layout)
		go protocolUpdate(g)
		go pactorUpdate(g)
		go statusUpdate(g)

		// Set keybindings
		if err := keybindings(g); err != nil {
			log.Panicln(err)
		}
		// Start the main TUI loop
		if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
			log.Panicln(err)
		}
	} else {
		// daemon mode: just print a message and wait for CTRL-C
		done := make(chan os.Signal, 1)
		signal.Notify(done, syscall.SIGINT, syscall.SIGTERM)
		fmt.Println("pactortcpbridge running, press ctrl+c to end the process...")
		<-done
	}
}