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package main

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

	"dim13.org/rss"
	"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")
)

const (
	lor      = `https://www.linux.org.ru/section-rss.jsp?section=1`
	undeadly = `http://undeadly.org/cgi?action=rss`
)

type Commander interface {
	irc.Handler
	fmt.Stringer
}

type (
	Last  string
	News  string
	BSD   string
	Theo  string
	Help  string
	Metar 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(), theo.Theo())
}

func (v News) String() string { return string(v) }
func (_ News) Handle(conn *irc.Conn, line *irc.Line) {
	news, err := rss.Fetch(lor)
	if err != nil {
		conn.Privmsg(line.Target(), err.Error())
		return
	}
	if line.Public() {
		news.Channel.Items = news.Channel.Items[:3]
	}
	for n, i := range news.Channel.Items {
		s := fmt.Sprintf("%2d. %v", n+1, i.Title)
		conn.Privmsg(line.Target(), s)
	}
}

func (v BSD) String() string { return string(v) }
func (_ BSD) Handle(conn *irc.Conn, line *irc.Line) {
	news, err := rss.Fetch(undeadly)
	if err != nil {
		conn.Privmsg(line.Target(), err.Error())
		return
	}
	if line.Public() {
		news.Channel.Items = news.Channel.Items[:3]
	}
	for n, i := range news.Channel.Items {
		s := fmt.Sprintf("%2d. %v", n+1, i.Title)
		conn.Privmsg(line.Target(), s)
	}
}

func (v Help) String() string { return string(v) }
func (_ Help) Handle(conn *irc.Conn, line *irc.Line) {
	var msg []string
	for k, v := range commands {
		msg = append(msg, fmt.Sprintf("%-8s%v", k, v))
	}
	sort.Sort(sort.StringSlice(msg))
	for _, s := range msg {
		conn.Privmsg(line.Target(), s)
	}
}

func (v Metar) String() string { return string(v) }
func (_ Metar) Handle(conn *irc.Conn, line *irc.Line) {
	f := strings.Fields(line.Text())
	if len(f) > 1 {
		var m []string
		var err error
		if line.Public() {
			m, err = MetarStation(f[1])
		} else {
			m, err = MetarDecoded(f[1])
		}
		if err != nil {
			conn.Privmsg(line.Target(), err.Error())
			return
		}
		for _, s := range m {
			conn.Privmsg(line.Target(), s)
		}
	}
}

func privmsg(conn *irc.Conn, line *irc.Line) {
	log.Println(line)
	f := strings.Fields(line.Text())

	if line.Public() && line.Nick != conn.Me().Nick {
		buffer.Value = line
		buffer = buffer.Next()
	}

	// lookup command
	if len(f) > 0 {
		if c, ok := commands[f[0]]; ok {
			c.Handle(conn, line)
		}
	}

	// extract single link and fetch title
	for _, v := range f {
		if strings.HasPrefix(v, "http") {
			if t, err := FetchTitle(v); 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("LOR news (msg private to see all)"))
	Register("bsd", BSD("Undeadly news (msg private to see all)"))
	Register("help", Help("This help"))
	Register("metar", Metar("Weather (argument: ICAO-Code, msg private for verbose output)"))
}

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
}