//
//  rhctl
//
//  Copyright (C) 2009-2016 Christian Pointner <equinox@helsinki.at>
//
//  This file is part of rhctl.
//
//  rhctl is free software: you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation, either version 3 of the License, or
//  any later version.
//
//  rhctl is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with rhctl. If not, see <http://www.gnu.org/licenses/>.
//

package main

import (
	"flag"
	"fmt"
	"io/ioutil"
	"log"
	"os"
	"os/signal"
	"sync"
)

var (
	rhl  = log.New(os.Stderr, "[rhctl]\t", log.LstdFlags)
	rhdl = log.New(ioutil.Discard, "[rhctl-dbg]\t", log.LstdFlags)
)

func init() {
	if _, exists := os.LookupEnv("RHCTL_DEBUG"); exists {
		rhdl.SetOutput(os.Stderr)
	}
}

type envStringValue string

func newEnvStringValue(key, dflt string) *envStringValue {
	if envval, exists := os.LookupEnv(key); exists {
		return (*envStringValue)(&envval)
	} else {
		return (*envStringValue)(&dflt)
	}
}

func (s *envStringValue) Set(val string) error {
	*s = envStringValue(val)
	return nil
}

func (s *envStringValue) Get() interface{} { return string(*s) }

func (s *envStringValue) String() string { return fmt.Sprintf("%s", *s) }

func main() {
	webAddr := newEnvStringValue("RHCTL_WEB_ADDR", "localhost:4080")
	flag.Var(webAddr, "web-addr", "addr:port to listen on (environment: RHCTL_WEB_ADDR)")
	help := flag.Bool("help", false, "show usage")

	flag.Parse()
	if *help {
		flag.Usage()
		return
	}

	var wg sync.WaitGroup

	port, err := SerialOpenAndHandle("/dev/ttyUSB0", B38400)
	if err != nil {
		rhl.Println("Error opening serial:", err)
		return
	}
	port.tx <- "hello world\n"

	if webAddr.Get().(string) != "" {
		wg.Add(1)
		go func() {
			defer wg.Done()
			rhl.Println("starting web-api:", webAddr.Get().(string))
			//StartWeb(webAddr.Get().(string))
			rhl.Println("web-api finished")
		}()
	}

	alldone := make(chan bool)
	go func() {
		defer func() { alldone <- true }()
		wg.Wait()
	}()

	c := make(chan os.Signal, 1)
	signal.Notify(c, os.Interrupt)

	select {
	case <-c:
		rhl.Println("received interrupt, shutdown")
		return
	case <-alldone:
		return
	}
}