###
# Copyright (c) 2003-2004, Jeremiah Fincher
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are met:
#
#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
#   * Redistributions in binary form must reproduce the above copyright notice,
#     this list of conditions, and the following disclaimer in the
#     documentation and/or other materials provided with the distribution.
#   * Neither the name of the author of this software nor the name of
#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

"""
Gives the user the ability to schedule commands to run at a particular time,
or repeatedly run at a particular interval.
"""

import supybot

__revision__ = "$Id$"
__author__ = supybot.authors.jemfinch

import supybot.plugins as plugins

import sets
import time

import supybot.conf as conf
import supybot.utils as utils
import supybot.privmsgs as privmsgs
import supybot.schedule as schedule
import supybot.callbacks as callbacks


class Scheduler(callbacks.Privmsg):
    def __init__(self):
        callbacks.Privmsg.__init__(self)
        self.events = {}

    def _makeCommandFunction(self, irc, msg, command, remove=True):
        """Makes a function suitable for scheduling from command."""
        tokens = callbacks.tokenize(command)
        Owner = irc.getCallback('Owner')
        ambiguous = Owner.disambiguate(irc, tokens)
        if ambiguous:
            raise callbacks.Error, callbacks.ambiguousReply(ambiguous)
        def f():
            if remove:
                del self.events[str(f.eventId)]
            self.Proxy(irc.irc, msg, tokens)
        return f

    def add(self, irc, msg, args):
        """<seconds> <command>

        Schedules the command string <command> to run <seconds> seconds in the
        future.  For example, 'scheduler add [seconds 30m] "echo [cpu]"' will
        schedule the command "cpu" to be sent to the channel the schedule add
        command was given in (with no prefixed nick, a consequence of using
        echo).
        """
        (seconds, command) = privmsgs.getArgs(args, required=2)
        try:
            seconds = int(seconds)
        except ValueError:
            irc.error('Invalid seconds value: %r' % seconds)
            return
        f = self._makeCommandFunction(irc, msg, command)
        id = schedule.addEvent(f, time.time() + seconds)
        f.eventId = id
        self.events[str(id)] = command
        irc.replySuccess('Event #%s added.' % id)

    def remove(self, irc, msg, args):
        """<id>

        Removes the event scheduled with id <id> from the schedule.
        """
        id = privmsgs.getArgs(args)
        id = id.lower()
        if id in self.events:
            del self.events[id]
            try:
                id = int(id)
            except ValueError:
                pass
            try:
                schedule.removeEvent(id)
                irc.replySuccess()
            except KeyError:
                irc.error('Invalid event id.')
        else:
            irc.error('Invalid event id.')

    def repeat(self, irc, msg, args):
        """<name> <seconds> <command>

        Schedules the command <command> to run every <seconds> seconds,
        starting now (i.e., the command runs now, and every <seconds> seconds
        thereafter).  <name> is a name by which the command can be
        unscheduled.
        """
        (name, seconds, command) = privmsgs.getArgs(args, required=3)
        name = name.lower()
        try:
            seconds = int(seconds)
        except ValueError:
            irc.error('Invalid seconds: %r' % seconds)
            return
        try:
            name = int(name)
            irc.error('Names must not be an integer.')
            return
        except ValueError:
            pass
        self.events[name] = command
        f = self._makeCommandFunction(irc, msg, command, remove=False)
        id = schedule.addPeriodicEvent(f, seconds, name)
        assert id == name
        # We don't reply because the command runs immediately.
        # But should we?  What if the command doesn't have visible output?
        # irc.replySuccess()

    def list(self, irc, msg, args):
        """takes no arguments

        Lists the currently scheduled events.
        """
        L = self.events.items()
        if L:
            L.sort()
            for (i, (name, command)) in enumerate(L):
                L[i] = '%s: %s' % (name, utils.dqrepr(command))
            irc.reply(utils.commaAndify(L))
        else:
            irc.reply('There are currently no scheduled commands.')


Class = Scheduler

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