import stackless
import random
import logging
import pickle
import time
import ansi
import auth
import config
import telnet
import traceback
from twisted.internet import reactor
from tpers import TPrs, TPLS, Version
import tpers

class Event(TPrs):
    def InitPersistent(self, game):
        self.game = game

    def InitTransient(self):
        self.rgtk = TPLS()
        self.stkValue = []

    def oob(self, tok, dgoob):
        return Oob(self, tok, dgoob)

    def receive(self, tok):
        chNotify = tok.chEv
        self.rgtk.append(tok)
        while True:
            ev, value = chNotify.receive()
            if ev == self:
                return value
            ev.rgtk.append(tok)
            if ev in tok.mpevDgoob and tok.mpevDgoob[ev](value):
                raise Event.OobBreakException()

    def fire(self, value = None):
        self.stkValue.append(value)
        self.game.queueEv.append(self)
        self.game.ensureRun()

    def fireI(self):
        rgtkOld = self.rgtk
        value = self.stkValue[0]
        self.stkValue = self.stkValue[1:]
        self.rgtk = TPLS()
        for tk in rgtkOld:
            if tk.fRunning:
                tk.chEv.send((self,value))
        stackless.run()

class Oob(object):
    def __init__(self, ev, tok, dgoob):
        self.ev = ev
        self.tok = tok
        self.dgoob = dgoob
    def __enter__(self):
        self.ev.rgtk.append(self.tok)
        self.tok.mpevDgoob[self.ev] = self.dgoob
    def __exit__(self, etype, eval, tb):
        if etype != TaskletExit:
            try:
                self.tok.mpevDgoob.pop(self.ev)
                self.ev.rgtk.remove(self.tok)
                if etype == OobBreakException:
                    return True
            except Exception:
                print "exception exiting oob:"
                traceback.print_exc()
                print "oob:", etype, eval
                traceback.print_tb(tb)

class OobBreakException(Exception):
    pass

class Runner(TPrs):
    def InitPersistent(self):
        self.mpuser_cld = {}
        print "New Runner created"

    def InitTransient(self):
        self.rgclient = []

    def GetCld(self, user):
        cld = self.mpuser_cld.get(user)
        if cld == None:
            cld = Cld(user)
            self.mpuser_cld[user] = cld
        return cld

    def RunGameI(self, client):
        client.runner = self
        self.rgclient.append(client)
        def OnDisconnect():
            self.rgclient.remove(client)
        client.addDgQuit(OnDisconnect)
        return self.RunGame(client)

    def RunServer(self):
        for client in self.rgclient:
            client.quit(True)
        telnet.RunServer(self.RunGameI)
def Run(clsRunner, fn):
    runner = tpers.Odb.Load(fn) or clsRunner()

    def ExecCmd(stCmd):
        if stCmd == "save":
            tpers.Odb.Save(runner, fn)
            return "Saved to " + fn
        return "Unrecognized command: '" + stCmd + "'"
    telnet.RunCmdServer(ExecCmd)

    runner.RunServer()

class Ownable(TPrs):
    def InitPersistent(self, owner = None):
        self.owner = owner
        self.rgtokOwn = TPLS()
        if owner != None:
            owner.rgtokOwn.append(self)
    def FPersist(self):
        if self.owner != None and not self.owner.FPersist():
            return False
        return TPrs.FPersist(self)
    def die(self):
        if self.owner != None:
            self.owner.rgtokOwn.remove(self)
        for tok in [x for x in self.rgtokOwn]:
            tok.die()
        self.DontPersist()

@Version(2)
class Game(Ownable):
    def InitPersistent(self):
        Ownable.InitPersistent(self)
        self.fQuit = False
        self.running = False
        self.mptagTokenset = {}
        self.rgdgdie = []
        self.evJoin = Event(self)
        self.evLeave = Event(self)
        self.mpuser_cldg = {}
        self.CreateRgtok(self.GetRgclsTokPers(), True)

    def InitTransient(self):
        self.MakeTransient("fScheduled", False)
        self.rgclient = []        
        self.rgproc = [PTimer(), PEvent(), PDraw(*self.GetRgtagDraw())]
        for proc in self.rgproc:
            proc.setGame(self)
        # don't recreate tokens when game has died (shouldn't even be persisting)
        if not self.FDead():
            self.CreateRgtok(self.GetRgclsTokTrans(), False)
        else:
            print "Dead", self.__class__, "has persisted"

    def FDead(self):
        try:
            rc = self.rc
            return True
        except:
            return False
    def GetCldg(self, user):
        cldg = self.mpuser_cldg.get(user)
        if cldg == None:
            cldg = Cldg()
            self.mpuser_cldg[user] = cldg
        return cldg
        
    def GetRgclsTokPers(self):
        return []

    def GetRgclsTokTrans(self): 
        return []

    def GetRgtagDraw(self): 
        return ["background", "solid", "overlay"]

    def CreateRgtok(self, rgclsTok, fPersist):
        for clsTok in rgclsTok:
            if FIter(clsTok):
                tok = clsTok[0](self, *clsTok[1:])
            else:
                tok = clsTok(self)
            if not fPersist:
                tok.DontPersist()

    def tagToken(self, token, tag):
        if not (tag in self.mptagTokenset):
            self.mptagTokenset[tag] = set([token])
        else:
            self.mptagTokenset[tag].add(token)

    def untagToken(self, token, tag):
        if tag in self.mptagTokenset:
            self.mptagTokenset[tag].discard(token)

    def rgtoken(self, tag, rgpriority = []):
        if not (tag in self.mptagTokenset):
            return []

        rgtoken = []
        tokenSet = self.mptagTokenset[tag].copy()
        for priority in rgpriority:
            if (priority in self.mptagTokenset):
                ptokenSet = self.mptagTokenset[priority] & tokenSet
                for token in ptokenSet:
                    rgtoken.append(token)
                tokenSet -= ptokenSet
        for token in tokenSet:
            rgtoken.append(token)

        return rgtoken

    def quit(self):
        self.running = False
        self.fQuit = True

    def finish(self, rc = None):
        self.running = False
        self.rc = rc
    class QuitException(Exception):
        pass

    class LoadException(Exception):
        pass

    def die(self):
        for dgdie in self.rgdgdie:
            dgdie()
        Ownable.die(self)
    def runStep(self):
        try:
            if self.running:
                for proc in self.rgproc:
                    proc.process()
                if not self.running:
                    self.die()
                    for client in self.rgclient:
                        client.leaveGame(self.rc)
                for client in self.rgclient:
                    client.postRunStep()
        finally:
            self.fScheduled = False
        return self.running
    def joinGame(self,client):
        self.rgclient.append(client)
        self.evJoin.fire(client)

    def leaveGame(self, client):
        self.evLeave.fire(client)

    def leaveGameI(self, client):
        self.rgclient.remove(client)
    def ensureRun(self):
        self.running = True
        if not self.fScheduled:
            self.fScheduled = True
            reactor.callLater(0, self.runStep)
    def UpgradeFrom(self, versionOld):
        if versionOld < 2:
            self.mpuser_cldg = {}
            
# Client data
@Version(2)
class Cld(TPrs):
    def InitPersistent(self, user):
        self.user = user
    def UpgradeFrom(self, versionOld):
        if versionOld < 2:
            del self.mpgame_cldg

#per-game client data
class Cldg(TPrs):
    def FPersist(self):
        if len(self._persistent) == 0:
            return False
        return TPrs.FPersist(self)

class Client(TPrs):
    def InitTransient(self):
        self.chRun = stackless.channel()
        self.gameCurr = None
        self.chCont = None
        self.fRunning = False
        self.dgJoinGame = None
        self.rgdgQuit = []
        self.fQuit = False
        self.cld = None
        self.runner = None

    def FPersist(self):
        return False
    def go(self, fnRun, protocol):
        self.protocol = protocol
        self.tskRun = stackless.tasklet(fnRun)
        self.tskRun(self)
        if self._runTskRun():
            self.gameCurr.ensureRun()
    def joinGame(self, game):
        assert not self.fRunning, "already running"
        chCont = stackless.channel()
        self.chRun.send((game, chCont))
        return chCont.receive()

    def leaveGame(self, rc = None):
        self.fRunning = False
        self.gameCurr.leaveGame(self)
        self.rc = rc

    def quit(self):
        self.leaveGame(None)
        self.fQuit = True
    def _runTskRun(self):
        "run self.tskRun after it has been scheduled, and await results"
        stackless.run() 
        if not self.tskRun.scheduled:
            return False
        self.gameCurr, self.chCont = self.chRun.receive()
        self.gameCurr.joinGame(self)
        self.fRunning = True
        if self.dgJoinGame:
            self.dgJoinGame(self, self.gameCurr)
        return True

    def postRunStep(self):
        if not self.fRunning:
            self.gameCurr.leaveGameI(self)
            if not self.fQuit:
                self.chCont.send(self.rc)
                self.fQuit = not self._runTskRun()
        if self.fQuit:
            for dgQuit in self.rgdgQuit:
                dgQuit()
        return self.fQuit
    def beep(self):
        pass
    def login(self, user, passwd):
        authr = getattr(auth, config.AUTH + "Auth")()
        if (authr.FAuthorized(user, passwd)):
            self.cld = self.runner.GetCld(user)
            return True
        return False
    def addDgQuit(self, dgquit):
        self.rgdgQuit.append(dgquit)

    def removeDgQuit(self, dgquit):
        self.rgdgQuit.remove(dgquit)
    def Cldg(self, game = None):
        if game == None:
            game = self.gameCurr
        return game.GetCldg(self.cld.user)

class Processor(TPrs):
    def setGame(self, game):
        self.game = game

    def process(self):
        pass

class PTimer(Processor):
    def msNow(self):
        return int(time.time() * 1000)
    def setGame(self, game):
        self.game = game
        self.fReset = False
        game.evTick = Event(game)
        game.ms = 0
        game.msDelta = 0
        self.dms = -self.msNow()

    def __setstate__(self, dict):
        Processor.__setstate__(self, dict)
        self.fReset = True
    def process(self):
        if self.fReset:
            # keep game.ms constant
            self.dms = self.game.ms - self.msNow()
            self.fReset = False
        msNew = self.msNow() + self.dms
        self.game.msDelta = msNew - self.game.ms
        self.game.ms = msNew
        self.game.evTick.fire(self.game.msDelta)

class PEvent(Processor):
    def setGame(self, game):
        self.game = game
        game.queueEv = []
        game.rgdgdie.append(self.die)

    def die(self):
        for ev in self.game.queueEv:
            for tk in ev.rgtk:
                tk.die()
            ev.stkValue = []
        self.game.queueEv = []

    def process(self):
        while self.game.queueEv:
            self.game.queueEv[0].fireI()
            self.game.queueEv.pop(0)

class PDraw(Processor):
    def InitPersistent(self, *rgprio):
        self.rgprio = rgprio
        self.msDrawAgain = -1
        self.fTimerSet = False

    def process(self):
        if self.game.ms >= self.msDrawAgain:
            for client in self.game.rgclient:
                ascr = ansi.Ascr()
                for tok in self.game.rgtoken("drawable", self.rgprio):
                    try:
                        tok.draw(ascr, client)
                    except Exception:
                        print "error drawing"
                        traceback.print_exc()

                client.protocol.Draw(ascr)
            self.msDrawAgain = self.game.ms + 120
            self.fTimerSet = False
        elif not self.fTimerSet:
            reactor.callLater((self.msDrawAgain - self.game.ms) / 1000.0, self.game.ensureRun)
            self.fTimerSet = True
class Taggable(Ownable):
    def InitPersistent(self, owner, *rgtag):
        Ownable.InitPersistent(self, owner)
        game = owner
        while not isinstance(game, Game):
            game = game.owner
        self.game = game
        self.tags = set()
        self.tag(*rgtag)

    def tag(self, *rgtag):
        self.tags |= set(rgtag)
        for tag in rgtag:
            self.game.tagToken(self, tag)

    def untag(self, *rgtag):
        self.tags -= set(rgtag)
        for tag in rgtag:
            self.game.untagToken(self, tag)

    def die(self):
        for tag in self.tags.copy():
            self.untag(tag)
        Ownable.die(self)

class Token(Taggable):
    def InitPersistent(self, owner, *rgtag):
        Taggable.InitPersistent(self, owner, *rgtag)
        self.msGamePreWait = 0
        self.ms = 0
        self.fRunning = True
        self.rgtokOwn = TPLS()

    def InitTransient(self):
        Taggable.InitTransient(self)
        self.chEv = stackless.channel()
        self.tasklet = stackless.tasklet(self.runI)
        self.mpevDgoob = {}

        self._fWriteToPersistent = True
        self.tasklet()
    def __enter__(self):
        return self
    def __exit__(self, etype, eval, traceback):
        self.die()
    def wait(self, msDelta):
        # have we waited once already this tick?  If not, reset
        if (self.msGamePreWait != self.game.ms):
            self.ms = self.game.ms

        msEnd = self.ms + msDelta

        delay = (msEnd - self.game.ms) / 1000.0
        if delay > 0:
            reactor.callLater(delay, self.game.ensureRun)

        while (self.game.ms < msEnd):
            self.game.evTick.receive(self)
        self.ms = msEnd

        self.msGamePreWait = self.game.ms


    def die(self):
        self.tasklet.kill()
        self.fRunning = False
        Taggable.die(self)
    def run(self):
        pass

    def runI(self):
        try:
            self.run()
        #except TaskletExit:
        #    raise
        except Exception:
            print "token script crashed:"
            traceback.print_exc()
def FIter(l):
    try:
        iter(l)
        return True
    except Exception:
        return False

class TokenClient(Token):
    def InitPersistent(self, owner, client, *rgtag):
        Token.InitPersistent(self, owner, *rgtag)
        self.client = client

    def FPersist(self):
        return False