// vi:ts=4:sts=4:sw=4:noet:tw=72
//
// flokatirc
//
// Copyright (c) 2015,2016 Andreas Neue <an@dnix.de>

package main

import (
	"flag"
	"fmt"
	"runtime"
	"strings"
	"time"

	"code.dnix.de/an/xlog"

	"github.com/nickvanw/ircx"
	"github.com/sorcix/irc"
	"github.com/sorcix/irc/ctcp"

	"flokatirc/modules"
	"flokatirc/version"
)

var (
	name     = flag.String("name", "Flokati", "Nickname to use")
	server   = flag.String("server", "chat.freenode.org:6667", "Host:Port to connect to")
	channels = flag.String("chan", "#test", "Channels to join")
	nsname   = flag.String("nsname", "NickServ", "NickServ name")
	nspass   = flag.String("nspass", "", "NickServ password")
	mods     = flag.String("mods", "", "Modules to load")
	params   = flag.String("params", "", "Module params")
	autocmd  = flag.String("autocmd", "", "Autosend IRC command")
)

func init() {
	flag.Parse()
}

var (
	sayCh chan string
)

func main() {
	sayCh = make(chan string, 1024)

	xlog.Init(xlog.INFO)

	//bot := ircx.Classic(*server, *name)
	cfg := ircx.Config{User: *name, MaxRetries: 1000}
	bot := ircx.New(*server, *name, cfg)
	xlog.Info("%s started", SoftwareInfo())
	xlog.Info("Logging in")
	if err := bot.Connect(); err != nil {
		xlog.Fatal("Unable to dial IRC Server: %v", err)
	}

	//mods := strings.Split(*modules, ",")
	//TODO: implement more robust list parsing

	modules.Init(sayCh, *mods, *params)

	go func() {
		for {
			var targets string
			line := strings.Split(<-sayCh, "\n")
			if len(line) < 2 {
				continue
			}
			if line[0] != "*" {
				targets = line[0]
			} else {
				targets = *channels
			}
			for _, tar := range strings.Split(targets, ",") {
				bot.Sender.Send(&irc.Message{
					Command:  irc.PRIVMSG,
					Params:   []string{tar},
					Trailing: line[1],
				})
				time.Sleep(1 * time.Second)
			}
		}
	}()

	go Ping(bot)
	if *autocmd != "" {
		println(*autocmd)
		bot.Sender.Send(&irc.Message{Command: *autocmd})
	}
	RegisterHandlers(bot)
	bot.HandleLoop()
	xlog.Info("Exiting")
}

func RegisterHandlers(bot *ircx.Bot) {
	xlog.Info("Registering handlers")
	bot.HandleFunc(irc.RPL_WELCOME, ConnectHandler)
	bot.HandleFunc(irc.PING, PingHandler)
	bot.HandleFunc(irc.PRIVMSG, PrivmsgHandler)
}

func Ping(bot *ircx.Bot) {
	for {
		time.Sleep(1 * time.Minute)
		bot.Sender.Send(&irc.Message{Command: irc.PING})
	}
}

func ConnectHandler(s ircx.Sender, m *irc.Message) {
	if *nspass != "" {
		xlog.Info("Authenticating with NickServ: %v, %v", *name, *nspass)
		s.Send(&irc.Message{
			Command:  irc.PRIVMSG,
			Params:   []string{*nsname},
			Trailing: "IDENTIFY " + *name + " " + *nspass,
		})
	}
	xlog.Info("Joining channels: %v", *channels)
	for _, ch := range strings.Split(*channels, ",") {
		s.Send(&irc.Message{
			Command: irc.JOIN,
			Params:  []string{ch},
		})
	}
	time.Sleep(2 * time.Second)
	msg := ctcp.Action(fmt.Sprintf("running on %s", SoftwareInfo()))
	sayCh <- fmt.Sprintf("%s\n%s", "*", msg)
}

func PingHandler(s ircx.Sender, m *irc.Message) {
	xlog.Info("PingPong")
	s.Send(&irc.Message{
		Command:  irc.PONG,
		Params:   m.Params,
		Trailing: m.Trailing,
	})
}

func PrivmsgHandler(s ircx.Sender, m *irc.Message) {
	//TODO: implement message handler table
	HandleMessage(m)
	modules.HandleMessage(m)
}

func HandleMessage(m *irc.Message) {
	tok := strings.Split(m.Trailing, " ")
	if len(tok) < 1 {
		return
	}
	switch tok[0] {
	case "!version":
		msg := ctcp.Action(fmt.Sprintf("running on %s", SoftwareInfo()))
		sayCh <- fmt.Sprintf("%s\n%s", "*", msg)
		//sayCh <- fmt.Sprintf("%s\n%s", "*", SoftwareInfo())
	default:
	}
}

func SoftwareInfo() string {
	return fmt.Sprintf("flokatirc %s-%s (built %s [%s])", version.FlokatiVersion,
		version.FlokatiBuild, version.FlokatiBuilddate, runtime.Version())
}