package main

import (
	"crypto/tls"
	"flag"
	"fmt"
	"goqdpmbot/events_alerter"
	"goqdpmbot/works"
	"os"
	"path"
	"path/filepath"

	//	"runtime"
	//	"strconv"
	"strings"
	"sync"
	"time"

	"github.com/mattn/go-xmpp"
	"gopkg.in/ini.v1"
)

type cfgStruct struct {
	srv   string
	usr   string
	pwd   string
	dest  string
	notls bool
}

type commandMsg struct {
	remote  string
	message string
}

func serverName(host string) string {
	return strings.Split(host, ":")[0]
}

func cfgRead(CfgFile string) cfgStruct {
	dir, dir_err := filepath.Abs(filepath.Dir(os.Args[0]))
	var ret cfgStruct
	if dir_err != nil {
		fmt.Printf("fail to open dir: %v", dir_err)
	}
	cfg, cfg_err := ini.Load(path.Join(dir, CfgFile))
	if cfg_err != nil {
		fmt.Printf("Fail to read file: %v", cfg_err)
		os.Exit(1)
	}
	cfg_notls, _ := cfg.Section("").Key("notls").Bool()
	ret.srv = cfg.Section("").Key("server").String()
	ret.usr = cfg.Section("").Key("username").String()
	ret.pwd = cfg.Section("").Key("password").String()
	ret.notls = cfg_notls
	ret.dest = cfg.Section("").Key("dest").String()
	return ret
}

func jabberClient(cfg cfgStruct) *xmpp.Client {
	var server = flag.String("server", cfg.srv, "server")
	var username = flag.String("username", cfg.usr, "username")
	var password = flag.String("password", cfg.pwd, "password")
	var status = flag.String("status", "xa", "status")
	var statusMessage = flag.String("status-msg", "", "")
	var notls = flag.Bool("notls", cfg.notls, "No TLS")
	var debug = flag.Bool("debug", false, "debug output")
	var session = flag.Bool("session", false, "use server session")

	flag.Usage = func() {
		fmt.Fprintf(os.Stderr, "usage: example [options]\n")
		flag.PrintDefaults()
		os.Exit(2)
	}
	flag.Parse()
	if *username == "" || *password == "" {
		if *debug && *username == "" && *password == "" {
			fmt.Fprintf(os.Stderr, "no username or password were given; attempting ANONYMOUS auth\n")
		} else if *username != "" || *password != "" {
			flag.Usage()
		}
	}

	if !*notls {
		xmpp.DefaultConfig = tls.Config{
			ServerName:         serverName(*server),
			InsecureSkipVerify: false,
		}
	}

	var talk *xmpp.Client
	var err error
	options := xmpp.Options{Host: *server,
		User:          *username,
		Password:      *password,
		NoTLS:         *notls,
		Debug:         *debug,
		Session:       *session,
		Status:        *status,
		StatusMessage: *statusMessage,
	}

	talk, err = options.NewClient()
	if err != nil {
		fmt.Println(err)
	}
	return talk
}

// читаем из джаббера и отправляем в канал
func jabberReader(talk *xmpp.Client, command chan<- commandMsg, in <-chan int) {
	for {
		chat, err := talk.Recv()
		if err != nil {
			fmt.Println(err)
		}
		switch v := chat.(type) {
		case xmpp.Chat:
			com := commandMsg{remote: v.Remote, message: v.Text}
			command <- com
			//case xmpp.Presence:
			//	com := commandMsg{remote: v.From, message: v.Show}
			//	command <- com
		}
	}
}

// отправляем ответы из канала
func jabberSender(talk *xmpp.Client, msgChan <-chan commandMsg) {
	for {
		msg := <-msgChan
		remote := strings.Split(msg.remote, "/")[0]
		talk.Send(xmpp.Chat{Remote: remote, Type: "chat", Text: msg.message})
	}
}

// воркер
func worker(workerNum int, msgChan <-chan commandMsg, readerClose chan int, ansChan chan<- commandMsg) {
	for {
		message := <-msgChan
		fmt.Println("Worker = ", workerNum, "message= ", message.message)
		cmd := strings.Split(message.message, " ")
		workMap := works.Works()
		_, workExists := workMap[cmd[0]]
		if workExists {
			work, _ := workMap[cmd[0]]
			ans, err := work.(func(...string) (string, error))(cmd[1:]...)
			if err != nil {
				ansChan <- commandMsg{remote: message.remote, message: err.Error()}
			} else {
				ansChan <- commandMsg{remote: message.remote, message: ans}
			}
		} else if len(message.message) > 0 {
			ans := "неизвестная комманда"
			ansChan <- commandMsg{remote: message.remote, message: ans}
		}
	}
}

//нопоминальщик
func reminder(readerClose chan int, ansChan chan<- commandMsg) {
	for {
		msgSl := events_alerter.BuildAlert()
		fmt.Println("alerter works")
		fmt.Println(msgSl)
		for _, msgInt := range msgSl {
			tmpMsg := commandMsg{remote: msgInt.Remote(), message: msgInt.Message()}
			fmt.Println(tmpMsg)
			ansChan <- tmpMsg
		}
		time.Sleep(60 * time.Second)
	}
}

func main() {
	cfg := cfgRead("goqdpmbot.ini") // читаем конфигу

	goroutinesNum := 5      // количество потоков
	wg := &sync.WaitGroup{} // ожидаем интеррапта
	signal_channel := make(chan os.Signal, 1)
	readerClose := make(chan int, 1) // для закрытия всего зоопарка воркеров
	// каналы обмена инфой
	comChan := make(chan commandMsg, 5)
	ansChan := make(chan commandMsg, 5)
	// запускаем клиента
	talk := jabberClient(cfg)
	go jabberReader(talk, comChan, readerClose)
	go jabberSender(talk, ansChan)
	// и воркеров
	for i := 0; i < goroutinesNum; i++ {
		go worker(i, comChan, readerClose, ansChan)
		fmt.Println("worker started", i)
	}
	go reminder(readerClose, ansChan)
	// ожидаем выхода
	wg.Add(1)
	go func() {
		<-signal_channel
		wg.Done()
	}()
	wg.Wait()
	close(readerClose)
	time.Sleep(1 * time.Second)
	fmt.Println("interrupt")
	talk.Close()
}