import main
from utils.logging.log import *
from utils.logging.debug import *
from copy import deepcopy
from math import ceil
import modules.provision
from twisted.internet.threads import deferToThread

def allRelaysActive(net):
    relayNum = len(main.network[net].relays.keys())
    existNum = 0
    for i in main.network[net].relays.keys():
        name = net+str(i)
        if name in main.IRCPool.keys():
            if main.IRCPool[name].authenticated:
                existNum += 1
    if existNum == relayNum:
        return True
    return False

def getChanFree(net, new):
    chanfree = {}
    chanlimits = set()
    for i in main.network[net].relays.keys():
        if i in new:
            continue
        name = net+str(i)
        chanfree[i] = main.IRCPool[name].chanlimit-len(main.IRCPool[name].channels)
        chanlimits.add(main.IRCPool[name].chanlimit)
    if not len(chanlimits) == 1:
        error("Network %s has servers with different CHANLIMIT values" % net)
        return False
    return (chanfree, chanlimits.pop())

def emptyChanAllocate(net, flist, relay, new):
    chanfree = getChanFree(net, new)
    if not chanfree:
        return
    for i in new:
        chanfree[0][i] = chanfree[1]
    allocated = {}
    toalloc = len(flist)
    if toalloc > sum(chanfree[0].values()):
        error("Too many channels to allocate for %s - channels joined since initial query, wait a while" % net)
        return False
    for i in chanfree[0].keys():
        for x in range(chanfree[0][i]):
            if not len(flist):
                break
            if i in allocated.keys():
                allocated[i].append(flist.pop())
            else:
                allocated[i] = [flist.pop()]
    return allocated

def populateChans(net, clist, relay, new):
    #divided = array_split(clist, relay)
    allocated = emptyChanAllocate(net, clist, relay, new)
    if not allocated:
        return
    for i in allocated.keys():
        if net in main.TempChan.keys():
            main.TempChan[net][i] = allocated[i]
        else:
            main.TempChan[net] = {i: allocated[i]}

def notifyJoin(net):
    for i in main.network[net].relays.keys():
        name = net+str(i)
        if name in main.IRCPool.keys():
            main.IRCPool[name].checkChannels()

def minifyChans(net, listinfo):
    if not allRelaysActive(net):
        error("All relays for %s are not active, cannot minify list" % net)
        return False
    for i in main.network[net].relays.keys():
        name = net+str(i)
        for x in main.IRCPool[name].channels:
            for y in listinfo:
                if y[0] == x:
                    listinfo.remove(y)
    if not listinfo:
        log("We're on all the channels we want to be on, dropping LIST")
        return False
    return listinfo

def keepChannels(net, listinfo, mean, sigrelay, relay):
    listinfo = minifyChans(net, listinfo)
    if not listinfo:
        return
    if relay <= main.config["ChanKeep"]["SigSwitch"]: # we can cover all of the channels
        coverAll = True
    elif relay > main.config["ChanKeep"]["SigSwitch"]: # we cannot cover all of the channels
        coverAll = False
        if not sigrelay <= main.config["ChanKeep"]["MaxRelay"]:
            error("Network %s is too big to cover: %i relays required" % (net, sigrelay))
            return
    if coverAll:
        needed = relay-len(main.network[net].relays.keys())
        newNums = modules.provision.provisionMultipleRelays(net, needed)
        flist = [i[0] for i in listinfo]
        populateChans(net, flist, relay, newNums)
    else:
        needed = sigrelay-len(main.network[net].relays.keys())
        newNums = modules.provision.provisionMultipleRelays(net, needed)
        siglist = [i[0] for i in listinfo if int(i[1]) > mean]
        populateChans(net, siglist, sigrelay, newNums)
    notifyJoin(net)

def nukeNetwork(net):
    #purgeRecords(net)
    #p = main.g.pipeline()
    main.g.delete("analytics.list."+net)
    #p.delete("list."+net)
    #p.execute()

#def nukeNetwork(net):
#    deferToThread(_nukeNetwork, net)


def _initialList(net, num, listinfo, chanlimit):
    listlength = len(listinfo)
    cumul = 0
    try:
        cumul += sum(int(i[1]) for i in listinfo)
    except TypeError:
        warn("Bad LIST data received from %s - %i" % (net, num))
        return
    mean = round(cumul/listlength, 2)
    siglength = 0
    insiglength = 0
    sigcumul = 0
    insigcumul = 0
    for i in listinfo:
        if int(i[1]) > mean:
            siglength += 1
            sigcumul += int(i[1])
        elif int(i[1]) < mean:
            insiglength += 1
            insigcumul += int(i[1])

    sigrelay = ceil(siglength/chanlimit)
    relay = ceil(listlength/chanlimit)
    netbase = "list.%s" % net
    abase = "analytics.list.%s" % net
    p = main.g.pipeline()
    p.hset(abase, "mean", mean)
    p.hset(abase, "total", listlength)
    p.hset(abase, "sigtotal", siglength)
    p.hset(abase, "insigtotal", insiglength)
    p.hset(abase, "sigperc", round(siglength/listlength*100, 2))
    p.hset(abase, "insigperc", round(insiglength/listlength*100, 2))
    p.hset(abase, "cumul", cumul)
    p.hset(abase, "sigcumul", sigcumul)
    p.hset(abase, "insigcumul", insigcumul)
    p.hset(abase, "relay", relay)
    p.hset(abase, "sigrelay", sigrelay)
    p.hset(abase, "insigrelay", ceil(insiglength/chanlimit))

    # Purge existing records before writing
    #purgeRecords(net)
    #for i in listinfo:
    #    p.rpush(netbase+"."+i[0], i[1])
    #    p.rpush(netbase+"."+i[0], i[2])
    #    p.sadd(netbase, i[0])

    p.execute()
    debug("List parsing completed on %s" % net)
    keepChannels(net, listinfo, mean, sigrelay, relay)

def initialList(net, num, listinfo, chanlimit):
    deferToThread(_initialList, net, num, deepcopy(listinfo), chanlimit)