#!/usr/bin/env python

###
# Copyright (c) 2002, Jeremiah Fincher
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# modification, are permitted provided that the following conditions are met:
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#     this list of conditions, and the following disclaimer.
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###

"""
Keeps track of the last time a user was seen on a channel.
"""

__revision__ = "$Id$"

import plugins

import os
import re
import sets
import time
import getopt
import string
from itertools import imap, ifilter

import log
import conf
import utils
import world
import ircdb
import ircmsgs
import plugins
import ircutils
import privmsgs
import registry
import callbacks

def ircToLowerOrInt(x):
    if isinstance(x, int):
        return x
    else:
        return ircutils.toLower(x)
    
class IrcStringAndIntDict(utils.InsensitivePreservingDict):
    key = staticmethod(ircToLowerOrInt)
    
class SeenDB(plugins.ChannelUserDB):
    IdDict = IrcStringAndIntDict
    def serialize(self, v):
        return list(v)

    def deserialize(self, channel, id, L):
        (seen, saying) = L
        return (float(seen), saying)
    
    def update(self, channel, nickOrId, saying):
        seen = time.time()
        self[channel, nickOrId] = (seen, saying)
        self[channel, '<last>'] = (seen, saying)

    def seen(self, channel, nickOrId):
        return self[channel, nickOrId]

filename = os.path.join(conf.supybot.directories.data(), 'Seen.db')
            
class Seen(callbacks.Privmsg):
    noIgnore = True
    def __init__(self):
        self.db = SeenDB(filename)
        world.flushers.append(self.db.flush)
        callbacks.Privmsg.__init__(self)

    def die(self):
        if self.db.flush in world.flushers:
            world.flushers.remove(self.db.flush)
        else:
            self.log.debug('Odd, no flush in flushers: %r', world.flushers)
        self.db.close()
        callbacks.Privmsg.die(self)
        
    def doPrivmsg(self, irc, msg):
        if ircutils.isChannel(msg.args[0]):
            said = ircmsgs.prettyPrint(msg)
            channel = msg.args[0]
            self.db.update(channel, msg.nick, said)
            try:
                id = ircdb.users.getUserId(msg.prefix)
                self.db.update(channel, id, said)
            except KeyError:
                pass # Not in the database.
        
    def seen(self, irc, msg, args):
        """[<channel>] [--user] [<name>]

        Returns the last time <name> was seen and what <name> was last seen
        saying.  --user will look for user <name> instead of using <name> as
        a nick (registered users, remember, can be recognized under any number
        of nicks) <channel> is only necessary if the message isn't sent on the
        channel itself.  If <name> is not specified, the last person that was
        seen and their message will be returned.
        """
        channel = privmsgs.getChannel(msg, args)
        (optlist, rest) = getopt.getopt(args, '', ['user'])
        name = privmsgs.getArgs(rest, required=0, optional=1)
        if name:
            nickOrId = name
            if ('--user', '') in optlist:
                try:
                    nickOrId = ircdb.users.getUserId(name)
                except KeyError:
                    try:
                        hostmask = irc.state.nickToHostmask(name)
                        nickOrId = ircdb.users.getUserId(hostmask)
                    except KeyError:
                        irc.errorNoUser()
                        return
            try:
                (when, said) = self.db.seen(channel, nickOrId)
                irc.reply('%s was last seen here %s ago saying: %s' % 
                          (name, utils.timeElapsed(time.time()-when), said))
            except KeyError:
                irc.reply('I have not seen %s.' % name)
        else:
            try:
                (when, said) = self.db.seen(channel, '<last>')
                irc.reply('Someone was last seen here %s ago saying: %s' %
                          (utils.timeElapsed(time.time()-when), said))
            except KeyError:
                irc.reply('I have never seen anyone.')


Class = Seen

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