from twisted.internet.threads import deferToThread
from string import digits

import main
from utils.logging.log import *
from utils.logging.debug import debug
from utils.parsing import parsen

def getWhoSingle(name, query):
    result = main.r.sscan("live.who."+name, 0, query, count=-1)
    if result[1] == []:
        return None
    return (i.decode() for i in result[1])

def getWho(query):
    result = {}
    for i in main.network.keys():
        f = getWhoSingle(i, query)
        if f:
            result[i] = f
    return result

def getChansSingle(name, nick):
    nick = ["live.chan."+name+"."+i for i in nick]
    result = main.r.sinter(*nick)
    if len(result) == 0:
        return None
    return (i.decode() for i in result)

def getChanList(name, nick):
    chanspace =  "live.chan."+name+"."+nick
    result = main.r.smembers(chanspace)
    if len(result) == 0:
        return None
    return (i.decode() for i in result)

def getChans(nick):
    result = {}
    for i in main.network.keys():
        f = getChansSingle(i, nick)
        if f:
            result[i] = f
    return result

def getUsersSingle(name, nick):
    nick = ("live.who."+name+"."+i for i in nick)
    result = main.r.sinter(*nick)
    if len(result) == 0:
        return None
    return (i.decode() for i in result)

def getUsers(nick):
    result = {}
    for i in main.network.keys():
        f = getUsersSingle(i, nick)
        if f:
            result[i] = f
    return result

def getNumWhoEntries(name):
    return main.r.scard("live.who."+name)

def getNumTotalWhoEntries():
    total = 0
    for i in main.network.keys():
        total += getNumWhoEntries(i)
    return total

def getNamespace(name, channel, nick):
    gnamespace = "live.who.%s" % name
    namespace = "live.who.%s.%s" % (name, channel)
    chanspace = "live.chan.%s.%s" % (name, nick)
    mapspace = "live.map.%s" % name
    return (gnamespace, namespace, chanspace, mapspace)

def _initialUsers(name, channel, users):
    gnamespace = "live.who.%s" % name
    mapspace = "live.map.%s" % name
    p = main.r.pipeline()
    for i in users:
        user = i[0]+"!"+i[1]+"@"+i[2]
        p.hset(mapspace, i[0], user)
        p.sadd(gnamespace, user)
    p.execute()

def initialUsers(name, channel, users):
    debug("Initialising WHO records for %s on %s" % (channel, name))
    d = deferToThread(_initialUsers, name, channel, users)
    #d.addCallback(testCallback)

def _initialNames(name, channel, names):
    namespace = "live.who.%s.%s" % (name, channel)
    p = main.r.pipeline()
    for i in names:
        p.sadd(namespace, i)
        p.sadd("live.chan."+name+"."+i, channel)
    p.execute()

def initialNames(name, channel, names):
    debug("Initialising NAMES records for %s on %s" % (channel, name))
    d = deferToThread(_initialNames, name, channel, names)
    #d.addCallback(testCallback)

def editUser(name, user):
    gnamespace = "live.who.%s" % name
    mapspace = "live.map.%s" % name
    parsed = parsen(user)
    p = main.r.pipeline()
    p.sadd(gnamespace, user)
    p.hset(mapspace, parsed[0], user) # add nick -> user mapping
    p.execute()

def addUser(name, channel, nick, user):
    gnamespace, namespace, chanspace, mapspace = getNamespace(name, channel, nick)
    p = main.r.pipeline()
    p.sadd(gnamespace, user)
    p.sadd(namespace, nick)
    p.sadd(chanspace, channel)
    p.hset(mapspace, nick, user)
    p.execute()

def delUser(name, channel, nick, user):
    gnamespace, namespace, chanspace, mapspace = getNamespace(name, channel, nick)
    p = main.r.pipeline()
    channels = main.r.smembers(chanspace)
    p.srem(namespace, nick)
    if channels == {channel.encode()}: # can we only see them on this channel?
        p.delete(chanspace) # remove channel tracking entry
        p.hdel(mapspace, nick) # remove nick mapping entry
        if user:
            p.srem(gnamespace, user) # remove global userinfo entry
        else:
            warn("Attempt to delete nonexistent user: %s" % user)
    else:
        p.srem(chanspace, channel) # keep up - remove the channel from their list
    p.execute()

def escape(text):
    chars = ["[", "]", "^", "-", "*", "?"]
    text = text.replace("\\", "\\\\")
    for i in chars:
        text = text.replace(i, "\\"+i)
    return text

def getUserByNick(name, nick):
    gnamespace = "live.who.%s" % name # "nick": "nick!ident@host"
    mapspace = "live.map.%s" % name
    if main.r.hexists(mapspace, nick):
        return main.r.hget(mapspace, nick)
    else:
        warn("Entry doesn't exist: %s on %s - attempting auxiliary lookup" % (nick, mapspace))
        #return Falsedd
    # legacy code below - remove when map is reliable
    usermatch = main.r.sscan(gnamespace, match=escape(nick)+"!*", count=-1)
    if usermatch[1] == []:
        return False
    else:
        if len(usermatch[1]) == 1:
            user = usermatch[1][0]
            return user
        else:
            warn("Auxiliary lookup failed: %s on %s" % (nick, gnamespace))
            return False

def renameUser(name, oldnick, olduser, newnick, newuser):
    gnamespace = "live.who.%s" % name
    chanspace = "live.chan.%s.%s" % (name, oldnick)
    mapspace = "live.map.%s" % name
    newchanspace = "live.chan.%s.%s" % (name, newnick)
    p = main.r.pipeline()
    p.srem(gnamespace, olduser)
    p.sadd(gnamespace, newuser)
    for i in main.r.smembers(chanspace):
        i = i.decode()
        p.srem("live.who."+name+"."+i, oldnick)
        p.sadd("live.who."+name+"."+i, newnick)
        p.hdel(mapspace, oldnick)
        p.hset(mapspace, newnick, newuser)
    if main.r.exists(chanspace):
        p.rename(chanspace, newchanspace)
    else:
        warn("Key doesn't exist: %s" % chanspace)
    p.execute()

def delUserByNick(name, channel, nick): # kick
    user = getUserByNick(name, nick)
    delUser(name, channel, nick, user)

def delUserByNetwork(name, nick, user): # quit
    gnamespace = "live.who.%s" % name
    chanspace = "live.chan.%s.%s" % (name, nick)
    mapspace = "live.chan.%s" % name
    p = main.r.pipeline()
    p.srem(gnamespace, user)
    for i in main.r.smembers(chanspace):
        p.srem("live.who."+name+"."+i.decode(), nick)
    p.delete(chanspace)
    p.hdel(mapspace, nick)
    p.execute()

def _delChannels(net, channels):
    gnamespace = "live.who.%s" % net
    mapspace = "live.map.%s" % net
    p = main.r.pipeline()
    for channel in channels:
        namespace = "live.who.%s.%s" % (net, channel)
        for i in main.r.smembers(namespace):
            nick = i.decode()
            #user = getUserByNick(net, nick) -- far too many function calls
            user = main.r.hget(mapspace, nick)
            if not user:
                warn("User lookup failed: %s on %s" % (nick, net))
            if main.r.smembers("live.chan."+net+"."+nick) == {channel.encode()}:
                if user:
                    p.srem(gnamespace, user)
                p.delete("live.chan."+net+"."+nick)
                p.hdel(mapspace, nick) # remove map entry
            else:
                p.srem("live.chan."+net+"."+nick, channel)
        p.delete(namespace)
    p.execute()

def delChannels(net, channels):
    debug("Purging channel %s for %s" % (", ".join(channels), net))
    d = deferToThread(_delChannels, net, channels)
    #d.addCallback(testCallback)