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package main

import (
	"container/ring"
	"flag"
	"fmt"
	"log"
	"strings"
	"time"

	tdr "dim13.org/theo"
	irc "github.com/fluffle/goirc/client"
)

var (
	server = flag.String("server", "irc.rusnet.org.ru:6660", "IRC Server")
	room   = flag.String("room", "#lor", "IRC Channel")
	name   = flag.String("name", "mincom", "Bots Name")
)

type Commander interface {
	irc.Handler
	fmt.Stringer
}

type (
	Last string
	News string
	BSD  string
	Theo string
	Help string
)

var (
	commands = make(map[string]Commander)
	buffer   = ring.New(10)
)

func Register(cmd string, f Commander) {
	commands[cmd] = f
}

func (v Last) String() string { return string(v) }
func (_ Last) Handle(conn *irc.Conn, line *irc.Line) {
	buffer.Do(func(v interface{}) {
		if v != nil {
			l := v.(*irc.Line)
			s := fmt.Sprintf("%v <%v> %v",
				l.Time.Format(time.Kitchen),
				l.Nick, l.Text())
			conn.Privmsg(line.Nick, s)
		}
	})
}

func (v Theo) String() string { return string(v) }
func (_ Theo) Handle(conn *irc.Conn, line *irc.Line) {
	conn.Privmsg(line.Target(), tdr.Theo())
}

func (v News) String() string { return string(v) }
func (_ News) Handle(conn *irc.Conn, line *irc.Line) {
	n, err := FetchNews(lor)
	if err != nil {
		conn.Privmsg(line.Target(), err.Error())
		return
	}
	if line.Public() {
		n = n[:3]
	}
	for _, s := range n {
		conn.Privmsg(line.Target(), s)
	}
}

func (v BSD) String() string { return string(v) }
func (_ BSD) Handle(conn *irc.Conn, line *irc.Line) {
	n, err := FetchNews(undeadly)
	if err != nil {
		conn.Privmsg(line.Target(), err.Error())
		return
	}
	if line.Public() {
		n = n[:3]
	}
	for _, s := range n {
		conn.Privmsg(line.Target(), s)
	}
}

func (v Help) String() string { return string(v) }
func (_ Help) Handle(conn *irc.Conn, line *irc.Line) {
	for k, v := range commands {
		s := fmt.Sprintf("%4s: %v", k, v)
		conn.Privmsg(line.Target(), s)
	}
}

func privmsg(conn *irc.Conn, line *irc.Line) {
	log.Println(line)
	txt := line.Text()
	if line.Public() && line.Nick != conn.Me().Nick {
		buffer.Value = line
		buffer = buffer.Next()
	}
	// lookup command
	if f := strings.Fields(txt); len(f) > 0 {
		if c, ok := commands[f[0]]; ok {
			c.Handle(conn, line)
		}
	}
	// extract single link and fetch title
	if strings.Contains(txt, "http") {
		if i := strings.Index(txt, "http"); i >= 0 {
			txt = txt[i:]
		}
		if i := strings.IndexAny(txt, " ,"); i > 0 {
			txt = txt[:i]
		}
		if t, err := FetchTitle(txt); err == nil {
			conn.Privmsg(line.Target(), t)
		}
	}
}

func init() {
	flag.Parse()
	Register("last", Last("return last 10 messages"))
	Register("theo", Theo("Quote Theo De Raadt"))
	Register("news", News("Last LOR news (msg private to see all)"))
	Register("bsd", BSD("Last Undeadly news (msg private to see all)"))
	Register("help", Help("This help"))
}

func main() {
	c := irc.SimpleClient(*name)
	c.EnableStateTracking()

	quit := make(chan bool)
	c.HandleFunc(irc.DISCONNECTED,
		func(conn *irc.Conn, line *irc.Line) { quit <- true })

	c.HandleFunc(irc.CONNECTED,
		func(conn *irc.Conn, line *irc.Line) { conn.Join(*room) })

	c.HandleFunc(irc.PRIVMSG, privmsg)

	if err := c.ConnectTo(*server); err != nil {
		log.Fatal(err)
	}

	<-quit
}