package r3xmppbot

import (
	xmpp "code.google.com/p/goexmpp"
	"fmt"
    "log"
    "crypto/tls"
    "os"
    "time"
    "encoding/json"
    "path"
)

//~ type StdLogger struct {
//~ }

//~ func (s *StdLogger) Log(v ...interface{}) {
        //~ log.Println(v...)
//~ }

//~ func (s *StdLogger) Logf(fmt string, v ...interface{}) {
        //~ log.Printf(fmt, v...)
//~ }

func (botdata *XmppBot) makeXMPPMessage(to, message string, subject interface{}) *xmpp.Message {
    xmppmsgheader := xmpp.Header{To: to,
                                                            From: botdata.my_jid_,
                                                            Id: <-xmpp.Id,
                                                            Type: "chat",
                                                            Lang: "",
                                                            Innerxml: "",
                                                            Error: nil,
                                                            Nested: make([]interface{},0)}
    msgsubject := xmpp.Generic{}
    if subject != nil {
        msgsubject.Chardata = subject.(string)
    }
    return &xmpp.Message{Header: xmppmsgheader , Subject: &msgsubject, Body: &xmpp.Generic{Chardata:message}, Thread: &xmpp.Generic{}}
}

func (botdata *XmppBot) makeXMPPPresence(to, ptype string) *xmpp.Presence {
    xmppmsgheader := xmpp.Header{To: to,
                                                            From: botdata.my_jid_,
                                                            Id: <-xmpp.Id,
                                                            Type: ptype,
                                                            Lang: "",
                                                            Innerxml: "",
                                                            Error: nil,
                                                            Nested: make([]interface{},0)}
    return &xmpp.Presence{Header: xmppmsgheader}
}

type R3JIDDesire int

const (
    R3NoChange R3JIDDesire = -1
    R3NoInfo R3JIDDesire = iota // ignore first value by assigning to blank identifier
    R3NoOfflineInfo
    R3AllInfo 
    R3DebugInfo
)

type JidData struct {
	Online  bool
    Wants   R3JIDDesire
}

type JabberEvent struct {
    JID      string
    Online   bool
    Wants    R3JIDDesire
}

type PresenceEvent struct {
    Present bool
    DoorLock bool
    DoorAjar bool
}

type RealraumXmppNotifierConfig map[string]JidData

type XmppBot struct {
    jid_lastauthtime_ map[string]int64
    realraum_jids_ RealraumXmppNotifierConfig
    password_ string
    auth_cmd_ string
    my_jid_ string
    auth_timeout_ int64
    config_file_ string
    my_login_password_ string
    xmppclient_ *xmpp.Client
    presence_events_ *chan interface{}    
}


func (data RealraumXmppNotifierConfig) saveTo(filepath string) () {
    fh, err := os.Create(filepath)
    if err != nil {
        log.Println(err)
        return
    }
    defer fh.Close()
    enc := json.NewEncoder(fh)
    if err = enc.Encode(&data); err != nil {
        log.Println(err)
        return
    }
}

func (data RealraumXmppNotifierConfig) loadFrom(filepath string) () {
    fh, err := os.Open(filepath)
    if err != nil {
        log.Println(err)
        return
    }
    defer fh.Close()
    dec := json.NewDecoder(fh)
    if err = dec.Decode(&data); err != nil {
        log.Println(err)
        return
    }
    for to, jiddata := range data  {
        jiddata.Online = false
        data[to]=jiddata
    }
}


func init() {
        //~ logger := &StdLogger{}
        //~ xmpp.Debug = logger
        //~ xmpp.Info = logger
        //~ xmpp.Warn = logger
}

func (botdata *XmppBot) handleEventsforXMPP(xmppout chan <- xmpp.Stanza, presence_events <- chan interface{}, jabber_events <- chan JabberEvent) {
    var msg, presence_str, lock_str, ajar_str string
    last_presence := false
    var debug_msg bool
    
	for {
        debug_msg = false
		select {
		case pe := <-presence_events:
            switch pec := pe.(type) {
                case xmpp.Stanza:
                    xmppout <- pec
                    continue
                case string:
                    msg = pec
                case PresenceEvent:
                    if pec.Present {
                        presence_str = "Somebody is present !"
                    } else {
                        presence_str = "Everybody left."
                    }
                    if pec.DoorLock {
                        lock_str = "locked"
                    } else {
                        lock_str = "unlocked"
                    }
                    if pec.DoorAjar {
                        ajar_str = "ajar"
                    } else {
                        ajar_str = "shut"
                    }
                    msg = fmt.Sprintf("%s (Door is %s and %s)", presence_str, lock_str, ajar_str)
                    if last_presence == pec.Present {
                        debug_msg = true
                    } else {
                        last_presence = pec.Present
                    }
                default:
                    break
                }
                
                for to, jiddata := range botdata.realraum_jids_  {
                    if debug_msg && jiddata.Wants < R3DebugInfo {
                        continue
                    }
                    if (jiddata.Wants == R3NoOfflineInfo && jiddata.Online) || jiddata.Wants > R3NoOfflineInfo {
                        xmppout <-  botdata.makeXMPPMessage(to, msg, nil)
                    }  //else  {
                        //~ fmt.Println("Not sending to ", to, jiddata)
                    //~ }
                }
                
		case je := <-jabber_events:
            jid_data, jid_in_map := botdata.realraum_jids_[je.JID]
            if jid_in_map {
                jid_data.Online = je.Online
                if je.Wants > R3NoChange {
                    jid_data.Wants = je.Wants
                }
                botdata.realraum_jids_[je.JID] = jid_data
                botdata.realraum_jids_.saveTo(botdata.config_file_)
            } else if je.Wants > R3NoChange {
                botdata.realraum_jids_[je.JID] = JidData{je.Online, je.Wants}
                botdata.realraum_jids_.saveTo(botdata.config_file_)
            }
		}
	}    
}

func removeJIDResource(jid string) string {
    var jidjid xmpp.JID
    jidjid.Set(jid)
    jidjid.Resource = ""
    return jidjid.String()
}

func (botdata *XmppBot) isAuthenticated(jid string) bool {
    authtime, in_map := botdata.jid_lastauthtime_[jid]
    //~ log.Println("isAuthenticated", in_map, authtime, time.Now().Unix(), auth_timeout_, time.Now().Unix() - authtime > auth_timeout_)
    return in_map && time.Now().Unix() - authtime < botdata.auth_timeout_
}

const help_text_ string = "\nauth <password>\n  .... enables you to use the other commands\non\n  .... you will be notified of r3 status changes\noff\n  .... you will no longer recieve notifications\non_while_offline\n  .... you will be notified of r3 status changes even if you are offline"

//~ var re_msg_auth_    *regexp.Regexp     = regexp.MustCompile("auth\s+(\S+)")

func (botdata *XmppBot) handleIncomingMessageDialog(inmsg xmpp.Message, xmppout chan<- xmpp.Stanza, jabber_events chan JabberEvent) {
    if inmsg.Body == nil || inmsg.GetHeader() == nil {
        return
    }
    bodytext :=inmsg.Body.Chardata
    //~ log.Println("Message Body:", bodytext)
    if botdata.isAuthenticated(inmsg.GetHeader().From) {
        switch bodytext {
            case "on":
                jabber_events <- JabberEvent{removeJIDResource(inmsg.GetHeader().From), true, R3NoOfflineInfo}
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "Receive r3 information while online" , "Your New Status")
            case "off":
                jabber_events <- JabberEvent{removeJIDResource(inmsg.GetHeader().From), true, R3NoInfo}
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "Do not receive r3 information" , "Your New Status")
            case "on_while_offline":
                jabber_events <- JabberEvent{removeJIDResource(inmsg.GetHeader().From), true, R3AllInfo}
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "Receive r3 information even while offline" , "Your New Status")
            case "debug":
                jabber_events <- JabberEvent{removeJIDResource(inmsg.GetHeader().From), true, R3DebugInfo}
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "Debug mode enabled" , "Your New Status")
            case "bye", "Bye", "quit", "logout":
                botdata.jid_lastauthtime_[inmsg.GetHeader().From] = 0
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "Bye Bye !" ,nil)
            default:
                //~ auth_match = re_msg_auth_.FindStringSubmatch(inmsg.Body.Chardata)
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, help_text_, "Available Commands")
        }
    } else {
        switch bodytext {
            case "Hilfe","hilfe","help","Help","?","hallo","Hallo","Yes","yes","ja","ja bitte","bitte","sowieso":
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, help_text_, "Available Commands")
            case botdata.auth_cmd_:
                botdata.jid_lastauthtime_[inmsg.GetHeader().From] = time.Now().Unix()
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "You are now authorized to use commands" , "Authorized")
            default:
                //~ auth_match = re_msg_auth_.FindStringSubmatch(inmsg.Body.Chardata)
                xmppout <- botdata.makeXMPPMessage(inmsg.GetHeader().From, "A nice day to you too !\nDo you need \"help\" ?", nil)
        }
    }
}

func (botdata *XmppBot) handleIncomingXMPPStanzas(xmppin <- chan xmpp.Stanza, xmppout chan<- xmpp.Stanza, jabber_events chan JabberEvent) {
    var incoming_stanza interface{}
    for incoming_stanza = range xmppin {
        switch stanza := incoming_stanza.(type) {
            case *xmpp.Message:
                botdata.handleIncomingMessageDialog(*stanza, xmppout, jabber_events)
            case *xmpp.Presence:
                if stanza.GetHeader() == nil {
                    continue
                }
                if stanza.GetHeader().Type == "subscribe" {
                    xmppout <- botdata.makeXMPPPresence(stanza.GetHeader().From, "subscribed")
                }
                jabber_events <- JabberEvent{stanza.GetHeader().From, stanza.GetHeader().Type != "unavailable", R3NoChange}
            case *xmpp.Iq:
                if stanza.GetHeader() == nil {
                    continue
                }
        }
    }
}

var default_state_save_dir_ string = "/flash/var/lib/r3netstatus/"

func NewStartedBot(loginjid, loginpwd, password string, insecuretls bool) (*XmppBot, chan interface{}, error) {
    var err error
    botdata := new(XmppBot)

    botdata.realraum_jids_ = make(map[string]JidData, 1)
    botdata.jid_lastauthtime_ = make(map[string]int64,1)
    botdata.auth_cmd_ = "auth " + password
    botdata.my_jid_ = loginjid
    botdata.my_login_password_ = loginpwd
    botdata.auth_timeout_ = 1200
    
    botdata.config_file_ = path.Join(default_state_save_dir_, "r3xmpp."+removeJIDResource(loginjid)+".json")
    
    //~ log.Println(botdata.config_file_)
    
    //~ logger := &StdLogger{}
    //~ xmpp.Debug = logger
    //~ xmpp.Info = logger
    //~ xmpp.Warn = logger
    
    xmpp.TlsConfig = tls.Config{InsecureSkipVerify: insecuretls}
    botdata.realraum_jids_.loadFrom(botdata.config_file_)

    client_jid := new(xmpp.JID)
    client_jid.Set(botdata.my_jid_)
    botdata.xmppclient_, err = xmpp.NewClient(client_jid, botdata.my_login_password_, nil)
    if err != nil {
        log.Println("Error connecting to xmpp server", err)
        return nil, nil, err
    }

    err = botdata.xmppclient_.StartSession(false, &xmpp.Presence{})
    if err != nil {
        log.Println("'Error StartSession:", err)
        return nil, nil, err
    }

    presence_events := make(chan interface{},1)
    jabber_events := make(chan JabberEvent,1)

    go botdata.handleEventsforXMPP(botdata.xmppclient_.Out, presence_events, jabber_events)
    go botdata.handleIncomingXMPPStanzas(botdata.xmppclient_.In, botdata.xmppclient_.Out, jabber_events)

    botdata.presence_events_ = &presence_events

    return botdata, presence_events, nil
}

func (botdata *XmppBot) StopBot() {
    if botdata.xmppclient_ != nil {
        close(botdata.xmppclient_.Out)
    }
    if botdata.presence_events_ != nil {
        *botdata.presence_events_ <- false
        close(*botdata.presence_events_)
    }
}

//~ func main() {
    //~ bot, presence_events, err := NewStartedBot("realrauminfo@realraum.at/Tuer", "d7ynC6Dg", "r3alraumOLGAXMPPInfos", true)
    
    //~ if err != nil {
        //~ log.Println(err)
        //~ os.Exit(1)    
    //~ }
    
    //~ presence_events <- PresenceEvent{true, true, true}
    //~ presence_events <- PresenceEvent{true, true, false}
    //~ presence_events <- PresenceEvent{true, false, false}    
    
    //~ p := make([]byte, 1024)
    //~ for
    //~ {        
        //~ nr, _ := os.Stdin.Read(p)
        //~ if nr == 0 {
            //~ break
        //~ }
    //~ }
    
    //~ bot.StopBot()
//~ }