###
# Copyright (c) 2002-2005, 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
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
###

"""
Module for general worldly stuff, like global variables and whatnot.
"""

import gc
import os
import sys
import time
import atexit
import select
import threading
import multiprocessing

import re

import supybot.log as log
import supybot.conf as conf
import supybot.drivers as drivers
import supybot.ircutils as ircutils
import supybot.registry as registry

startedAt = time.time() # Just in case it doesn't get set later.

starting = False

mainThread = threading.currentThread()

def isMainThread():
    return mainThread is threading.currentThread()

threadsSpawned = 1 # Starts at one for the initial "thread."

class SupyThread(threading.Thread):
    def __init__(self, *args, **kwargs):
        global threadsSpawned
        threadsSpawned += 1
        super(SupyThread, self).__init__(*args, **kwargs)
        log.debug('Spawning thread %q.', self.getName())

processesSpawned = 1 # Starts at one for the initial process.
class SupyProcess(multiprocessing.Process):
    def __init__(self, *args, **kwargs):
        global processesSpawned
        processesSpawned += 1
        super(SupyProcess, self).__init__(*args, **kwargs)
        log.debug('Spawning process %q.', self.name)

if sys.version_info[0:3] == (3, 3, 1) and hasattr(select, 'poll'):
    # http://bugs.python.org/issue17707
    import multiprocessing.connection
    def _poll(fds, timeout):
        if timeout is not None:
            timeout = int(timeout * 1000)  # timeout is in milliseconds
        fd_map = {}
        pollster = select.poll()
        for fd in fds:
            pollster.register(fd, select.POLLIN)
            if hasattr(fd, 'fileno'):
                fd_map[fd.fileno()] = fd
            else:
                fd_map[fd] = fd
        ls = []
        for fd, event in pollster.poll(timeout):
            if event & select.POLLNVAL:
                raise ValueError('invalid file descriptor %i' % fd)
            ls.append(fd_map[fd])
        return ls
    multiprocessing.connection._poll = _poll


commandsProcessed = 0

ircs = [] # A list of all the IRCs.

def getIrc(network):
    network = network.lower()
    for irc in ircs:
        if irc.network.lower() == network:
            return irc
    return None

def _flushUserData():
    userdataFilename = os.path.join(conf.supybot.directories.conf(),
                                    'userdata.conf')
    registry.close(conf.users, userdataFilename)

flushers = [_flushUserData] # A periodic function will flush all these.

registryFilename = None

def flush():
    """Flushes all the registered flushers."""
    for (i, f) in enumerate(flushers):
        try:
            f()
        except Exception, e:
            log.exception('Uncaught exception in flusher #%s (%s):', i, f)

def debugFlush(s=''):
    if conf.supybot.debug.flushVeryOften():
        if s:
            log.debug(s)
        flush()

def upkeep():
    """Does upkeep (like flushing, garbage collection, etc.)"""
    # Just in case, let's clear the exception info.
    try:
        sys.exc_clear()
    except AttributeError:
        # Python 3 does not have sys.exc_clear. The except statement clears
        # the info itself (and we've just entered an except statement)
        pass
    if os.name == 'nt':
        try:
            import msvcrt
            msvcrt.heapmin()
        except ImportError:
            pass
        except IOError: # Win98 sux0rs!
            pass
    if conf.daemonized:
        if sys.version_info[0] >= 3:
            from io import TextIOWrapper as file
        # If we're daemonized, sys.stdout has been replaced with a StringIO
        # object, so let's see if anything's been printed, and if so, let's
        # log.warning it (things shouldn't be printed, and we're more likely
        # to get bug reports if we make it a warning).
        assert not type(sys.stdout) == file, 'Not a StringIO object!'
        if not hasattr(sys.stdout, 'getvalue'):
            # Stupid twisted sometimes replaces our stdout with theirs, because
            # "The Twisted Way Is The Right Way" (ha!).  So we're stuck simply
            # returning.
            log.warning('Expected cStringIO as stdout, got %r.', sys.stdout)
            return
        s = sys.stdout.getvalue()
        if s:
            log.warning('Printed to stdout after daemonization: %s', s)
            sys.stdout.reset() # Seeks to 0.
            sys.stdout.truncate() # Truncates to current offset.
        assert not type(sys.stderr) == file, 'Not a StringIO object!'
        s = sys.stderr.getvalue()
        if s:
            log.error('Printed to stderr after daemonization: %s', s)
            sys.stderr.reset() # Seeks to 0.
            sys.stderr.truncate() # Truncates to current offset.
    doFlush = conf.supybot.flush() and not starting
    if doFlush:
        flush()
        # This is so registry._cache gets filled.
        # This seems dumb, so we'll try not doing it anymore.
        #if registryFilename is not None:
        #    registry.open(registryFilename)
    if not dying:
        if sys.version_info[0] < 3:
            log.debug('Regexp cache size: %s', len(re._cache))
        log.debug('Pattern cache size: %s', len(ircutils._patternCache))
        log.debug('HostmaskPatternEqual cache size: %s',
                  len(ircutils._hostmaskPatternEqualCache))
        #timestamp = log.timestamp()
        if doFlush:
            log.info('Flushers flushed and garbage collected.')
        else:
            log.info('Garbage collected.')
    collected = gc.collect()
    if gc.garbage:
        log.warning('Noncollectable garbage (file this as a bug on SF.net): %s',
                    gc.garbage)
    return collected

def makeDriversDie():
    """Kills drivers."""
    log.info('Killing Driver objects.')
    for driver in drivers._drivers.itervalues():
        driver.die()

def makeIrcsDie():
    """Kills Ircs."""
    log.info('Killing Irc objects.')
    for irc in ircs[:]:
        if not irc.zombie:
            irc.die()
        else:
            log.debug('Not killing %s, it\'s already a zombie.', irc)

def startDying():
    """Starts dying."""
    log.info('Shutdown initiated.')
    global dying
    dying = True

def finished():
    log.info('Shutdown complete.')

# These are in order; don't reorder them for cosmetic purposes.  The order
# in which they're registered is the reverse order in which they will run.
atexit.register(finished)
atexit.register(upkeep)
atexit.register(makeIrcsDie)
atexit.register(makeDriversDie)
atexit.register(startDying)

##################################################
##################################################
##################################################
## Don't even *think* about messing with these. ##
##################################################
##################################################
##################################################
dying = False
testing = False
starting = False
profiling = False
documenting = False


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