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"""
Includes various accessories for callbacks.Privmsg based callbacks.
"""

__revision__ = "$Id$"

import supybot.fix as fix

import time
import types
import threading

import supybot.conf as conf
import supybot.utils as utils
import supybot.world as world
import supybot.ircdb as ircdb
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks
import supybot.structures as structures

def getChannel(msg, args=(), raiseError=True):
    """Returns the channel the msg came over or the channel given in args.

    If the channel was given in args, args is modified (the channel is
    removed).
    """
    if args and ircutils.isChannel(args[0]):
        if conf.supybot.reply.requireChannelCommandsToBeSentInChannel():
            if args[0] != msg.args[0]:
                s = 'Channel commands must be sent in the channel to which ' \
                    'they apply; if this is not the behavior you desire, ' \
                    'ask the bot\'s administrator to change the registry ' \
                    'variable ' \
                    'supybot.reply.requireChannelCommandsToBeSentInChannel ' \
                    'to False.'
                raise callbacks.Error, s
        return args.pop(0)
    elif ircutils.isChannel(msg.args[0]):
        return msg.args[0]
    else:
        if raiseError:
            raise callbacks.Error, 'Command must be sent in a channel or ' \
                                   'include a channel in its arguments.'
        else:
            return None

def getArgs(args, required=1, optional=0):
    """Take the required/optional arguments from args.

    Always returns a list of size required + optional, filling it with however
    many empty strings is necessary to fill the tuple to the right size.  If
    there is only one argument, a string containing that argument is returned.

    If there aren't enough args even to satisfy required, raise an error and
    let the caller handle sending the help message.
    """
    assert not isinstance(args, str), 'args should be a list.'
    assert not isinstance(args, ircmsgs.IrcMsg), 'args should be a list.'
    if len(args) < required:
        raise callbacks.ArgumentError
    if len(args) < required + optional:
        ret = list(args) + ([''] * (required + optional - len(args)))
    elif len(args) >= required + optional:
        ret = list(args[:required + optional - 1])
        ret.append(' '.join(args[required + optional - 1:]))
    if len(ret) == 1:
        return ret[0]
    else:
        return ret

def checkCapability(f, capability):
    """Makes sure a user has a certain capability before a command will run.
    capability can be either a string or a callable object which will be called
    in order to produce a string for ircdb.checkCapability."""
    def newf(self, irc, msg, args):
        cap = capability
        if callable(cap):
            cap = cap()
        if ircdb.checkCapability(msg.prefix, cap):
            f(self, irc, msg, args)
        else:
            self.log.info('%s attempted %s without %s.',
                          msg.prefix, f.func_name, cap)
            irc.errorNoCapability(cap)
    return utils.changeFunctionName(newf, f.func_name, f.__doc__)

def checkChannelCapability(f, capability):
    """Makes sure a user has a certain channel capability before running f.

    Do note that you need to add a "channel" argument to your argument list.
    """
    def newf(self, irc, msg, args, *L, **kwargs):
        channel = getChannel(msg, args)
        cap = capability
        if callable(cap):
            cap = cap()
        chancap = ircdb.makeChannelCapability(channel, cap)
        if ircdb.checkCapability(msg.prefix, chancap):
            L += (channel,)
            ff = types.MethodType(f, self, self.__class__)
            ff(irc, msg, args, *L, **kwargs)
        else:
            self.log.info('%s attempted %s without %s.',
                          msg.prefix, f.func_name, chancap)
            irc.errorNoCapability(chancap)
    return utils.changeFunctionName(newf, f.func_name, f.__doc__)

def thread(f):
    """Makes sure a command spawns a thread when called."""
    def newf(self, irc, msg, args, *L, **kwargs):
        if threading.currentThread() is world.mainThread:
            t = callbacks.CommandThread(target=irc._callCommand,
                                        args=(f.func_name, self),
                                        kwargs=kwargs)
            t.start()
        else:
            f(self, irc, msg, args, *L, **kwargs)
    return utils.changeFunctionName(newf, f.func_name, f.__doc__)

def channel(f):
    """Gives the command an extra channel arg as if it had called getChannel"""
    def newf(self, irc, msg, args, *L, **kwargs):
        channel = getChannel(msg, args)
        L = (channel,) + L
        ff = types.MethodType(f, self, self.__class__)
        ff(irc, msg, args, *L, **kwargs)
    return utils.changeFunctionName(newf, f.func_name, f.__doc__)

class CapabilityCheckingPrivmsg(callbacks.Privmsg):
    """A small subclass of callbacks.Privmsg that checks self.capability
    before allowing any command to be called.
    """
    capability = '' # To satisfy PyChecker
    def __init__(self, *args, **kwargs):
        self.__parent = super(CapabilityCheckingPrivmsg, self)
        self.__parent.__init__(*args, **kwargs)
        
    def callCommand(self, name, irc, msg, args, *L, **kwargs):
        if ircdb.checkCapability(msg.prefix, self.capability):
            self.__parent.callCommand(name, irc, msg, args, *L, **kwargs)
        else:
            self.log.warning('%s tried to call %s without %s.',
                             msg.prefix, name, self.capability)
            irc.errorNoCapability(self.capability)


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