#!/usr/bin/env python
from twisted.internet import reactor
from twisted.internet.ssl import DefaultOpenSSLContextFactory
from twisted.internet.protocol import Protocol, Factory
from twisted.internet.endpoints import SSL4ClientEndpoint, TCP4ClientEndpoint, connectProtocol
from twisted.words.protocols.irc import IRCClient

from json import load, dump, loads
from sys import exit

listener = None
connections = {}
IRCPool = {}

def log(data):
    print("[LOG]", data)

def debug(data):
    print("[DEBUG]", data)

def warn(data):
    print("[WARNING]", data)

def error(data):
    print("[ERROR]", data)
    exit(1)

def sendData(addr, data):
    connections[addr].send(data)

def sendSuccess(addr, data):
    sendData(addr, "[y] " + data)

def sendFailure(addr, data):
    sendData(addr, "[n] " + data)

def sendInfo(addr, data):
    sendData(addr, "[i] " + data)

class IRCBot(IRCClient):
    def __init__(self, name):
        self.name = name
        instance = pool[name]

        self.nickname = instance["nickname"]
        self.realname = instance["realname"]
        self.username = instance["username"]
        self.userinfo = instance["userinfo"]
        self.fingerReply = instance["finger"]
        self.versionName = instance["version"]
        self.versionNum = None
        self.versionEnv = None
        self.sourceURL = instance["source"]

        self._who = {}
        self._getWho = {}
        self.wholist = {}

        self.authtype = instance["authtype"]
        if self.authtype == "ns":
            self.authpass = instance["password"]
            self.authentity = instance["authentity"]
        else:
            self.password = instance["password"]

    def refresh(self):
        instance = pool[name]
        if not instance["nickname"] == self.nickname:
            self.nickname = instance["nickname"]
            self.setNick(self.nickname)

        self.userinfo = instance["userinfo"]
        self.fingerReply = instance["finger"]
        self.versionName = instance["version"]
        self.versionNum = None
        self.versionEnv = None
        self.sourceURL = instance["source"]

    def sanitize(self, user):
        user = user.replace("!", "")
        user = user.replace("~", "")
        user = user.replace("&", "")
        user = user.replace("@", "")
        user = user.replace("%", "")
        user = user.replace("+", "")
        return user

    def setNick(self, nickname):
        self._attemptedNick = nickname
        self.sendLine("NICK %s" % nickname)
        self.nickname = nickname

    def alterCollidedNick(self, nickname):
        newnick = nickname + "_"
        return newnick

    def irc_ERR_NICKNAMEINUSE(self, prefix, params):
        self._attemptedNick = self.alterCollidedNick(self._attemptedNick)
        self.setNick(self._attemptedNick)

    def irc_ERR_PASSWDMISMATCH(self, prefix, params):
        ircLog(self.ident, "Password mismatch")
        manager.handleWrongPassword(self.ident, prefix, params)

    def irc_RPL_NAMREPLY(self, prefix, params):
        channel = params[2]
        nicklist = params[3].split(' ')

        if channel not in self._names:
            return
        n = self._names[channel][1]
        n += nicklist

    def irc_RPL_ENDOFNAMES(self, prefix, params):
        channel = params[1]
        if channel not in self._names:
            return
        callbacks, namelist = self._names[channel]
        for cb in callbacks:
            cb.callback((channel, namelist))
        del self._names[channel]

    def got_names(self, nicklist):
        ncklist = []
        for i in nicklist[1]:
            ncklist.append(self.sanitize(i))
        self.nameslist[nicklist[0]] = ncklist

    def who(self, channel):
        channel = channel
        d = defer.Deferred()
        if channel not in self._who:
            self._who[channel] = ([], {})
        self._who[channel][0].append(d)
        self.sendLine("WHO %s" % channel)
        return d

    def irc_RPL_WHOREPLY(self, prefix, params):
        channel = params[1]
        user = params[2]
        host = params[3]
        server = params[4]
        nick = params[5]
        status = params[6]
        realname = params[7]
        if channel not in self._who:
            return
        n = self._who[channel][1]
        n[nick] = [nick, user, host, server, status, realname]

    def irc_RPL_ENDOFWHO(self, prefix, params):
        channel = params[1]
        if channel not in self._who:
            return
        callbacks, info = self._who[channel]
        for cb in callbacks:
            cb.callback((channel, info))
        del self._who[channel]

    def got_who(self, whoinfo):
        self.wholist[whoinfo[0]] = whoinfo[1]

    def signedOn(self):
        if self.authtype == "ns":
            self.msg(self.authentity, "IDENTIFY %s" % self.nspass)

    def joined(self, channel):
        self.who(channel).addCallback(self.got_who)

class Base(Protocol):
    def __init__(self, addr):
        self.addr = addr
        self.authed = False
        if config["UsePassword"] == False:
            self.authed = True

    def send(self, data):
        data += "\r\n"
        data = data.encode("utf-8", "replace")
        self.transport.write(data)

    def dataReceived(self, data):
        data = data.decode("utf-8", "replace")
        log("Data received from %s:%s -- %s" % (self.addr.host, self.addr.port, repr(data)))
        helper.parseCommand(self.addr, self.authed, data)

    def connectionMade(self):
        log("Connection from %s:%s" % (self.addr.host, self.addr.port))
        self.send("Hello.")

    def connectionLost(self, reason):
        global connections
        self.authed = False
        log("Connection lost from %s:%s -- %s" % (self.addr.host, self.addr.port, reason.getErrorMessage()))
        if not listener == None:
            if self.addr in connections.keys():
                del connections[self.addr]
            else:
                warn("Tried to remove a non-existant connection.")
        else:
            warn("Tried to remove a connection from a listener that wasn't running.")

class BaseFactory(Factory):
    def buildProtocol(self, addr):
        global connections
        entry = Base(addr)
        connections[addr] = entry
        return entry

    def send(self, addr, data):
        global connections
        if addr in connections.keys():
            connection = connections[addr]
            connection.send(data)
        else:
            return

class Helper(object):
    def getConfig(self):
        with open("config.json", "r") as f:
            config = load(f)
            if set(["Port", "BindAddress", "UseSSL", "UsePassword"]).issubset(set(config.keys())):
                if config["UseSSL"] == True:
                    if not set(["ListenerKey", "ListenerCertificate"]).issubset(set(config.keys())):
                        error("SSL is on but certificate or key is not defined")
                if config["UsePassword"] == True:
                    if not "Password" in config.keys():
                        error("Password authentication is on but password is not defined")
                return config
            else:
                error("Mandatory values missing from config")

    def getPool(self):
        with open("pool.json", "r") as f:
            data = f.read()
            if not data == "":
                pool = loads(data.strip())
                return pool
            else:
                return {}

    def savePool(self):
        global pool
        with open("pool.json", "w") as f:
            dump(pool, f, indent=4)
        return

    def getHelp(self):
        with open("help.json", "r") as f:
            help = load(f)
            return help

    def incorrectUsage(self, addr, mode):
        if mode == None:
            sendFailure(addr, "Incorrect usage")
            return
        if mode in help.keys():
            sendFailure(addr, "Usage: " + help[mode])
            return

    def addBot(self, name):
        global IRCPool
        instance = pool[name]
        if instance["protocol"] == "plain":
            if instance["bind"] == None:
                point = TCP4ClientEndpoint(reactor, instance["host"], int(instance["port"]), timeout=int(instance["timeout"]))
                bot = IRCBot(name)
                IRCPool[name] = bot
                d = connectProtocol(point, bot)
                return
            else:
                point = TCP4ClientEndpoint(reactor, instance["host"], int(instance["port"]), timeout=int(instance["timeout"]), bindAddress=instance["bind"])
                bot = IRCBot(name)
                IRCPool[name] = bot
                d = connectProtocol(point, bot)
                return
        elif instance["protocol"] == "ssl":
            contextFactory = DefaultOpenSSLContextFactory(instance["key"].encode("utf-8", "replace"), instance["certificate"].encode("utf-8", "replace"))
            if instance["bind"] == None:
                point = SSL4ClientEndpoint(reactor, instance["host"], int(instance["port"]), contextFactory, timeout=int(instance["timeout"]))
                bot = IRCBot(name)
                IRCPool[name] = bot
                d = connectProtocol(point, bot)
                return
            else:
                point = SSL4ClientEndpoint(reactor, instance["host"], int(instance["port"]), contextFactory, timeout=int(instance["timeout"]), bindAddress=instance["bind"])
                bot = IRCBot(name)
                IRCPool[name] = bot
                d = connectProtocol(point, bot)
                return

    def parseCommand(self, addr, authed, data):
        global pool
        data = data.strip()
        spl = data.split()
        obj = connections[addr]

        success = lambda data: sendSuccess(addr, data)
        failure = lambda data: sendFailure(addr, data)
        info = lambda data: sendInfo(addr, data)

        incUsage = lambda mode: self.incorrectUsage(addr, mode)
        length = len(spl)
        if len(spl) > 0:
            cmd = spl[0]
        else:
            failure("No text was sent")
            return

        if authed == True:
            if cmd == "help":
                helpMap = []
                for i in help.keys():
                    helpMap.append("%s: %s" % (i, help[i]))
                info("\n".join(helpMap))
                return

            elif cmd == "rehash":
                global config
                config = helper.getConfig()
                success("Configuration rehashed successfully")

            elif cmd == "pass":
                info("You are already authenticated")
                return

            elif cmd == "logout":
                obj.authed = False
                success("Logged out")
                return

            elif cmd == "list":
                poolMap = []
                for i in pool.keys():
                    poolMap.append("Server: %s" % i)
                    for x in pool[i].keys():
                        poolMap.append("%s: %s" % (x, pool[i][x]))
                    poolMap.append("\n")
                info("\n".join(poolMap))
                return

            elif cmd == "enable":
                if length == 2:
                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    pool[spl[1]]["enabled"] = True
                    self.addBot(spl[1])
                    success("Successfully enabled bot %s" % spl[1])
                    return
                else:
                    incUsage("enable")
                    return

            elif cmd == "disable":
                if length == 2:
                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    pool[spl[1]]["enabled"] = False
                    if spl[1] in IRCPool.keys():
                        IRCPool[spl[1]].transport.loseConnection()
                    success("Successfully disabled bot %s" % spl[1])
                    return
                else:
                    incUsage("disable")
                    return

            elif cmd == "add":
                if length == 6:

                    if spl[1] in pool.keys():
                        failure("Name already exists: %s" % spl[1])
                        return

                    protocol = spl[4].lower()

                    if not protocol in ["ssl", "plain"]:
                        incUsage("connect")
                        return

                    try:
                        int(spl[3])
                    except:
                        failure("Port must be an integer, not %s" % spl[3])
                        return

                    pool[spl[1]] = { "host": spl[2],
                                     "port": spl[3],
                                     "protocol": protocol,
                                     "bind": None,
                                     "timeout": 30,
                                     "nickname": spl[5],
                                     "username": None,
                                     "realname": None,
                                     "userinfo": None,
                                     "finger": None,
                                     "version": None,
                                     "source": None,
                                     "authtype": None,
                                     "password": None,
                                     "authentity": "NickServ",
                                     "key": config["ListenerKey"],
                                     "certificate": config["ListenerCertificate"],
                                     "enabled": config["ConnectOnCreate"],
                                   }
                    if config["ConnectOnCreate"] == True:
                        self.addBot(spl[1])
                    success("Successfully created bot")
                    self.savePool()
                    return
                else:
                    incUsage("add")
                    return

            elif cmd == "del":
                if length == 2:

                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    del pool[spl[1]]
                    if spl[1] in IRCPool.keys():
                        IRCPool[spl[1]].transport.loseConnection()
                        del IRCPool[spl[1]]
                    success("Successfully removed bot")
                    self.savePool()
                    return
                else:
                    incUsage("del")
                    return

            elif cmd == "mod":
                toUnset = False
                if length == 2:
                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    optionMap = ["Viewing options for %s" % spl[1]]
                    for i in pool[spl[1]].keys():
                        optionMap.append("%s: %s" % (i, pool[spl[1]][i]))
                    info("\n".join(optionMap))
                    return

                elif length == 3:
                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    if not spl[2] in pool[spl[1]].keys():
                        failure("No such key: %s" % spl[2])
                        return
                    info("%s: %s" % (spl[2], pool[spl[1]][spl[2]]))
                    return

                elif length == 4:
                    if not spl[1] in pool.keys():
                        failure("Name does not exist: %s" % spl[1])
                        return
                    if not spl[2] in pool[spl[1]].keys():
                        failure("No such key: %s" % spl[2])
                        return
                    if spl[2] in ["port", "timeout"]:
                        try:
                            int(spl[3])
                        except:
                            failure("Value must be an integer, not %s" % spl[3])
                            return
                    if spl[2] == "protocol":
                        if not spl[3] in ["ssl", "plain"]:
                            failure("Protocol must be ssl or plain, not %s" % spl[3])
                            return
                    if spl[3] == pool[spl[1]][spl[2]]:
                        failure("Value already exists: %s" % spl[3])
                        return

                    if spl[3].lower() in ["none", "nil"]:
                        spl[3] = None
                        toUnset = True

                    if spl[2] == "authtype":
                        if not spl[3] in ["sp", "ns"]:
                            failure("Authtype must be sp or ns, not %s" % spl[3])
                            return
                    if spl[2] == "enabled":
                        failure("Use the enable and disable commands to manage this")
                        return

                    pool[spl[1]][spl[2]] = spl[3]
                    self.savePool()
                    if toUnset:
                        success("Successfully unset key %s on %s" % (spl[2], spl[3], spl[1]))
                    else:
                        success("Successfully set key %s to %s on %s" % (spl[2], spl[3], spl[1]))
                    return

                else:
                    incUsage("mod")

            else:
                incUsage(None)
                return
        else:
            if cmd == "pass" and length == 2:
                if spl[1] == config["Password"]:
                    success("Authenticated successfully")
                    obj.authed = True
                    return
                else:
                    failure("Password incorrect")
                    obj.transport.loseConnection()
                    return
            else:
                incUsage(None)
                return

if __name__ == "__main__":
    helper = Helper()
    config = helper.getConfig()
    pool = helper.getPool()
    help = helper.getHelp()
    for i in pool.keys():
        if pool[i]["enabled"] == True:
            helper.addBot(i)

    listener = BaseFactory()
    if config["UseSSL"] == True:
        reactor.listenSSL(config["Port"], listener, DefaultOpenSSLContextFactory(config["ListenerKey"], config["ListenerCertificate"]), interface=config["BindAddress"])
        log("Threshold running with SSL on %s:%s" % (config["BindAddress"], config["Port"]))
    else:
        reactor.listenTCP(config["Port"], listener, interface=config["BindAddress"])
        log("Threshold running on %s:%s" % (config["BindAddress"], config["Port"]))

    reactor.run()