###
# Copyright (c) 2002-2005, Jeremiah Fincher
# Copyright (c) 2009, James McCoy
# Copyright (c) 2010-2022, Valentin Lorentz
# 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.
###

import re
import os
import sys
import json
import time
import queue
import functools
import multiprocessing


import supybot

import supybot.conf as conf
from supybot import commands
import supybot.utils as utils
from supybot.commands import *
from supybot.commands import ProcessTimeoutError
import supybot.ircdb as ircdb
import supybot.irclib as irclib
import supybot.utils.minisix as minisix
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.callbacks as callbacks
import supybot.registry as registry
from supybot import commands

from supybot.i18n import PluginInternationalization, internationalizeDocstring
_ = PluginInternationalization('Misc')

if minisix.PY2:
    from itertools import ifilter as filter

def getPluginsInDirectory(directory):
    # get modules in a given directory
    plugins = []
    for filename in os.listdir(directory):
        pluginPath = os.path.join(directory, filename)
        if os.path.isdir(pluginPath):
            if all(os.path.isfile(os.path.join(pluginPath, x))
                    for x in ['__init__.py', 'config.py', 'plugin.py']):
                plugins.append(filename)
    return plugins

class RegexpTimeout(Exception):
    pass

class Misc(callbacks.Plugin):
    """Miscellaneous commands to access Supybot core. This is a core
    Supybot plugin that should not be removed!"""
    def __init__(self, irc):
        self.__parent = super(Misc, self)
        self.__parent.__init__(irc)
        self.invalidCommands = \
                ircutils.FloodQueue(conf.supybot.abuse.flood.interval())
        conf.supybot.abuse.flood.interval.addCallback(self.setFloodQueueTimeout)

    def setFloodQueueTimeout(self, *args, **kwargs):
        self.invalidCommands.timeout = conf.supybot.abuse.flood.interval()

    def callPrecedence(self, irc):
        return ([cb for cb in irc.callbacks if cb is not self], [])

    def invalidCommand(self, irc, msg, tokens):
        assert not msg.repliedTo, 'repliedTo msg in Misc.invalidCommand.'
        assert self is irc.callbacks[-1], 'Misc isn\'t last callback.'
        assert msg.command in ('PRIVMSG', 'NOTICE')
        self.log.debug('Misc.invalidCommand called (tokens %s)', tokens)
        # First, we check for invalidCommand floods.  This is rightfully done
        # here since this will be the last invalidCommand called, and thus it
        # will only be called if this is *truly* an invalid command.
        maximum = conf.supybot.abuse.flood.command.invalid.maximum()
        self.invalidCommands.enqueue(msg)
        if self.invalidCommands.len(msg) > maximum and \
           conf.supybot.abuse.flood.command.invalid() and \
           not ircdb.checkCapability(msg.prefix, 'trusted'):
            punishment = conf.supybot.abuse.flood.command.invalid.punishment()
            banmask = '*!%s@%s' % (msg.user, msg.host)
            self.log.info('Ignoring %s for %s seconds due to an apparent '
                          'invalid command flood.', banmask, punishment)
            if tokens and tokens[0] == 'Error:':
                self.log.warning('Apparent error loop with another Supybot '
                                 'observed.  Consider ignoring this bot '
                                 'permanently.')
            ircdb.ignores.add(banmask, time.time() + punishment)
            if conf.supybot.abuse.flood.command.invalid.notify():
                irc.reply(_('You\'ve given me %s invalid commands within the last '
                          '%i seconds; I\'m now ignoring you for %s.') %
                          (maximum,
                           conf.supybot.abuse.flood.interval(),
                           utils.timeElapsed(punishment, seconds=False)))
            return
        # Now, for normal handling.
        channel = msg.channel
        # Only bother with the invaildCommand flood handling if it's actually
        # enabled
        if conf.supybot.abuse.flood.command.invalid():
            # First, we check for invalidCommand floods.  This is rightfully done
            # here since this will be the last invalidCommand called, and thus it
            # will only be called if this is *truly* an invalid command.
            maximum = conf.supybot.abuse.flood.command.invalid.maximum()
            banmasker = conf.supybot.protocols.irc.banmask.makeBanmask
            if self.invalidCommands.len(msg) > maximum and \
               not ircdb.checkCapability(msg.prefix, 'trusted') and \
               msg.prefix != irc.prefix and \
               ircutils.isUserHostmask(msg.prefix):
                penalty = conf.supybot.abuse.flood.command.invalid.punishment()
                banmask = banmasker(msg.prefix, channel=channel,
                                    network=irc.network)
                self.log.info('Ignoring %s for %s seconds due to an apparent '
                              'invalid command flood.', banmask, penalty)
                if tokens and tokens[0] == 'Error:':
                    self.log.warning('Apparent error loop with another Supybot '
                                     'observed.  Consider ignoring this bot '
                                     'permanently.')
                ircdb.ignores.add(banmask, time.time() + penalty)
                if conf.supybot.abuse.flood.command.invalid.notify():
                    irc.reply('You\'ve given me %s invalid commands within '
                              'the last minute; I\'m now ignoring you for %s.' %
                              (maximum,
                               utils.timeElapsed(penalty, seconds=False)))
                return
        # Now, for normal handling.
        if conf.supybot.reply.whenNotCommand.getSpecific(
                irc.network, channel)():
            if len(tokens) >= 2:
                cb = irc.getCallback(tokens[0])
                if cb:
                    plugin = cb.name()
                    irc.error(format(_('The %q plugin is loaded, but there is '
                                     'no command named %q in it.  Try "list '
                                     '%s" to see the commands in the %q '
                                     'plugin.'), plugin, tokens[1],
                                     plugin, plugin))
                else:
                    irc.errorInvalid(_('command'), tokens[0], repr=False)
            else:
                command = tokens and tokens[0] or ''
                irc.errorInvalid(_('command'), command, repr=False)
        else:
            if tokens:
                # echo [] will get us an empty token set, but there's no need
                # to log this in that case anyway, it being a nested command.
                self.log.info('Not replying to %s in %s, not a command.',
                    tokens[0], channel or _('private'))
            if irc.nested:
                bracketConfig = conf.supybot.commands.nested.brackets
                brackets = bracketConfig.getSpecific(irc.network, channel)()
                if brackets:
                    (left, right) = brackets
                    irc.reply(left + ' '.join(tokens) + right)
                else:
                    pass # Let's just do nothing, I can't think of better.

    def isPublic(self, cb):
        name = cb.name()
        return conf.supybot.plugins.get(name).public()

    @internationalizeDocstring
    def list(self, irc, msg, args, optlist, cb):
        """[--private] [--unloaded] [<plugin>]

        Lists the commands available in the given plugin.  If no plugin is
        given, lists the public plugins available.  If --private is given,
        lists the private plugins. If --unloaded is given, it will list
        available plugins that are not loaded.
        """
        private = False
        unloaded = False
        for (option, argument) in optlist:
            if option == 'private':
                private = True
                if not self.registryValue('listPrivatePlugins') and \
                   not ircdb.checkCapability(msg.prefix, 'owner'):
                    irc.errorNoCapability('owner')
            elif option == 'unloaded':
                unloaded = True
                if not self.registryValue('listUnloadedPlugins') and \
                   not ircdb.checkCapability(msg.prefix, 'owner'):
                    irc.errorNoCapability('owner')
        if unloaded and private:
            irc.error(_('--private and --unloaded are incompatible options.'))
            return
        if not cb:
            if unloaded:
                # We were using the path of Misc + .. to detect the install
                # directory. However, it fails if Misc is not in the
                # installation directory for some reason, so we use a
                # supybot module.
                installedPluginsDirectory = os.path.join(
                        os.path.dirname(conf.__file__), 'plugins')
                plugins = getPluginsInDirectory(installedPluginsDirectory)
                for directory in conf.supybot.directories.plugins()[:]:
                    plugins.extend(getPluginsInDirectory(directory))
                # Remove loaded plugins:
                loadedPlugins = [x.name() for x in irc.callbacks]
                plugins = [x for x in plugins if x not in loadedPlugins]

                plugins.sort()
                irc.reply(format('%L', plugins))
            else:
                names = [cb.name() for cb in irc.callbacks
                         if (private and not self.isPublic(cb)) or
                            (not private and self.isPublic(cb))]
                names.sort()
                if names:
                    irc.reply(format('%L', names))
                else:
                    if private:
                        irc.reply(_('There are no private plugins.'))
                    else:
                        irc.reply(_('There are no public plugins.'))
        else:
            commands = cb.listCommands()
            if commands:
                commands.sort()
                irc.reply(format('%L', commands))
            else:
                irc.reply(format(_('That plugin exists, but has no commands.  '
                                 'This probably means that it has some '
                                 'configuration variables that can be '
                                 'changed in order to modify its behavior.  '
                                 'Try "config list supybot.plugins.%s" to see '
                                 'what configuration variables it has.'),
                                 cb.name()))
    list = wrap(list, [getopts({'private':'', 'unloaded':''}),
                       additional('plugin')])

    @internationalizeDocstring
    def apropos(self, irc, msg, args, s):
        """<string>

        Searches for <string> in the commands currently offered by the bot,
        returning a list of the commands containing that string.
        """
        commands = {}
        L = []
        for cb in irc.callbacks:
            if isinstance(cb, callbacks.Plugin):
                for command in cb.listCommands():
                    if s in command:
                        commands.setdefault(command, []).append(cb.name())
        for (key, names) in commands.items():
            for name in names:
                L.append('%s %s' % (name, key))
        if L:
            L.sort()
            irc.reply(format('%L', L))
        else:
            irc.reply(_('No appropriate commands were found.'))
    apropos = wrap(apropos, ['lowered'])

    @internationalizeDocstring
    def help(self, irc, msg, args, command):
        """[<plugin>] [<command>]

        This command gives a useful description of what <command> does.
        <plugin> is only necessary if the command is in more than one plugin.

        You may also want to use the 'list' command to list all available
        plugins and commands.
        """
        if not command:
            cHelp = self.registryValue("customHelpString")
            if cHelp:
                irc.reply(cHelp)
            else:
                irc.reply(_(
                    "Use the 'list' command to list all plugins, and "
                    "'list <plugin>' to list all commands in a plugin. "
                    "To show the help of a command, use 'help <command>'. "
                ))
            return
        command = list(map(callbacks.canonicalName, command))
        (maxL, cbs) = irc.findCallbacksForArgs(command)
        if maxL == command:
            if len(cbs) > 1:
                names = sorted([cb.name() for cb in cbs])
                irc.error(format(_('That command exists in the %L plugins.  '
                                 'Please specify exactly which plugin command '
                                 'you want help with.'), names))
            else:
                assert cbs, 'Odd, maxL == command, but no cbs.'
                irc.reply(_.__call__(cbs[0].getCommandHelp(command, False)))
        else:
            plugins = [cb.name() for cb in irc.callbacks
                       if self.isPublic(cb)]
            s = format(_('There is no command %q.'),
                        callbacks.formatCommand(command))
            if command[0].lower() in map(str.lower, plugins):
                if "Plugin" in plugins:
                    template = _(
                        " However, '{0}' is the name of a loaded plugin, and "
                        "you may be able to find its help using "
                        "'plugin help {0}' and its provided commands using "
                        "'list {0}'."
                    )
                else:
                    template = _(
                        " However, '{0}' is the name of a loaded plugin, and "
                        "you may be able to find its provided commands using "
                        "'list {0}'."
                    )
                s += template.format(command[0].title())
            irc.error(s)
    help = wrap(help, [any('something')])

    @internationalizeDocstring
    def version(self, irc, msg, args):
        """takes no arguments

        Returns the version of the current bot.
        """
        try:
            versions = []

            # fetch from PyPI
            data = json.loads(utils.web.getUrl(
                'https://pypi.org/pypi/limnoria/json'
            ).decode('utf8'))
            release_version = data['info']['version']
            # zero-left-pad months and days
            release_version = re.sub(
                r'\.([0-9])\b', lambda m: '.0' + m.group(1), release_version
            )

            # fetch from Git
            data = json.loads(utils.web.getUrl(
                'https://api.github.com/repos/progval/Limnoria/'
                'commits/master'
            ).decode('utf8'))
            git_version = data['commit']['committer']['date']
            # Strip the last 'Z':
            git_version = git_version.rsplit('T', 1)[0].replace('-', '.')

            newest = _(
                'The newest version available online is %(release_version)s, '
                'or %(git_version)s in Git'
            ) % {'release_version': release_version, 'git_version': git_version}
        except utils.web.Error as e:
            self.log.info('Couldn\'t get website version: %s', e)
            newest = _('I couldn\'t fetch the newest version '
                     'from the Limnoria repository.')
        s = _('The current (running) version of this Limnoria is %s, '
              'running on Python %s.  %s') % \
            (conf.version, sys.version.replace('\n', ' '), newest)
        irc.reply(s)
    version = wrap(thread(version))

    @internationalizeDocstring
    def source(self, irc, msg, args):
        """takes no arguments

        Returns a URL saying where to get Limnoria.
        """
        irc.reply(_('My source is at https://github.com/progval/Limnoria'))
    source = wrap(source)

    @internationalizeDocstring
    def more(self, irc, msg, args, nick):
        """[<nick>]

        If the last command was truncated due to IRC message length
        limitations, returns the next chunk of the result of the last command.
        If <nick> is given, it takes the continuation of the last command from
        <nick> instead of the person sending this message.
        """
        if '!' in msg.prefix and '@' in msg.prefix:
            userHostmask = msg.prefix.split('!', 1)[1]
        else:
            userHostmask = msg.nick
        if nick:
            try:
                (private, L) = irc._mores[nick]
                if not private:
                    irc._mores[userHostmask] = L[:]
                else:
                    irc.error(_('%s has no public mores.') % nick)
                    return
            except KeyError:
                irc.error(_('Sorry, I can\'t find any mores for %s') % nick)
                return
        try:
            L = irc._mores[userHostmask]
        except KeyError:
            irc.error(_('You haven\'t asked me a command; perhaps you want '
                      'to see someone else\'s more.  To do so, call this '
                      'command with that person\'s nick.'), Raise=True)
        number = self.registryValue('mores', msg.channel, irc.network)

        if conf.supybot.protocols.irc.experimentalExtensions() \
                and 'draft/multiline' in irc.state.capabilities_ack:
            use_multiline = True
            multiline_cap_values = ircutils.parseCapabilityKeyValue(
                irc.state.capabilities_ls['draft/multiline'])
            if multiline_cap_values.get('max-lines', '').isnumeric():
                number = min(number, int(multiline_cap_values['max-lines']))
        else:
            use_multiline = False

        msgs = L[-number:]
        msgs.reverse()
        L[-number:] = []
        if msgs:
            if use_multiline and len(msgs) > 1:
                # If draft/multiline is available, use it.
                # TODO: set concat=True. For now we can't, because every
                # message has "(XX more messages)" at the end, so it would be
                # unreadable if the messages were concatenated
                irc.queueMultilineBatches(msgs, target=msgs[0].args[0],
                        targetNick=msg.nick, concat=False)
            else:
                for msg in msgs:
                    irc.queueMsg(msg)
        else:
            irc.error(_('That\'s all, there is no more.'))
    more = wrap(more, [additional('seenNick')])

    def _validLastMsg(self, irc, msg):
        return msg.prefix and \
               msg.command == 'PRIVMSG' and \
               msg.channel

    @internationalizeDocstring
    def last(self, irc, msg, args, optlist):
        """[--{from,in,on,with,without,regexp} <value>] [--nolimit]

        Returns the last message matching the given criteria.  --from requires
        a nick from whom the message came; --in requires a channel the message
        was sent to; --on requires a network the message was sent on; --with
        requires some string that had to be in the message; --regexp requires
        a regular expression the message must match; --nolimit returns all
        the messages that can be found.  By default, the channel this command is
        given in is searched.
        """
        predicates = {}
        nolimit = False
        skipfirst = True
        if msg.channel:
            predicates['in'] = lambda m: ircutils.strEqual(m.args[0],
                                                           msg.channel)
        else:
            skipfirst = False

        final_predicates = []

        for (option, arg) in optlist:
            if option == 'from':
                def f(m, arg=arg):
                    return ircutils.hostmaskPatternEqual(arg, m.nick)
                predicates['from'] = f
            elif option == 'in':
                def f(m, arg=arg):
                    return ircutils.strEqual(m.args[0], arg)
                predicates['in'] = f
                if arg != msg.channel:
                    skipfirst = False
            elif option == 'on':
                def f(m, arg=arg):
                    return m.receivedOn == arg
                predicates['on'] = f
            elif option == 'with':
                def f(m, arg=arg):
                    return arg.lower() in m.args[1].lower()
                predicates.setdefault('with', []).append(f)
            elif option == 'without':
                def f(m, arg=arg):
                    return arg.lower() not in m.args[1].lower()
                predicates.setdefault('without', []).append(f)
            elif option == 'regexp':
                def f(messages, arg=arg):
                    reobj = re.compile(arg)

                    # using a queue to return results, so we can return at
                    # least some results in case of timeout
                    q = multiprocessing.Queue()

                    def p(messages):
                        for m in messages:
                            if ircmsgs.isAction(m):
                                s = ircmsgs.unAction(m)
                            else:
                                s = m.args[1]
                            if reobj.search(s):
                                q.put(m)
                    try:
                        process(p, messages, timeout=3.,
                                pn=self.name(), cn='last')
                    except ProcessTimeoutError:
                        pass
                    results = []
                    while True:
                        try:
                            results.append(q.get(False))
                        except queue.Empty:
                            break
                    return results
                final_predicates.append(f)
            elif option == 'nolimit':
                nolimit = True
        iterable = filter(functools.partial(self._validLastMsg, irc),
                          reversed(irc.state.history))
        if skipfirst:
            # Drop the first message only if our current channel is the same as
            # the channel we've been instructed to look at.
            next(iterable)
        predicates = list(utils.iter.flatten(predicates.values()))
        # Make sure the user can't get messages from channels they aren't in
        def userInChannel(m):
            return m.args[0] in irc.state.channels \
                    and msg.nick in irc.state.channels[m.args[0]].users
        predicates.append(userInChannel)
        # Make sure the user can't get messages from a +s channel unless
        # they're calling the command from that channel or from a query
        # TODO: support statusmsg, but be careful about leaking scopes.
        def notSecretMsg(m):
            return not irc.isChannel(msg.args[0]) \
                    or msg.args[0] == m.args[0] \
                    or (m.args[0] in irc.state.channels \
                        and 's' not in irc.state.channels[m.args[0]].modes)
        predicates.append(notSecretMsg)
        resp = []
        if irc.nested and not \
          self.registryValue('last.nested.includeTimestamp'):
            tsf = None
        else:
            tsf = self.registryValue('timestampFormat')
        if irc.nested and not self.registryValue('last.nested.includeNick'):
            showNick = False
        else:
            showNick = True

        candidates = []

        # Run predicates that filter on individual messages
        for m in iterable:
            for predicate in predicates:
                if not predicate(m):
                    break
            else:
                candidates.append(m)

        # Run predicates that filter lists of messages
        for predicate in final_predicates:
            candidates = predicate(candidates)

        for m in candidates:
            if nolimit:
                resp.append(ircmsgs.prettyPrint(m,
                                                timestampFormat=tsf,
                                                showNick=showNick))
            else:
                irc.reply(ircmsgs.prettyPrint(m,
                                              timestampFormat=tsf,
                                              showNick=showNick))
                return

        if not resp:
            irc.error(_('I couldn\'t find a message matching that criteria in '
                      'my history of %s messages.') % len(irc.state.history))
        else:
            irc.reply(format('%L', resp))
    last = wrap(last, [getopts({'nolimit': '',
                                'on': 'something',
                                'with': 'something',
                                'from': 'something',
                                'without': 'something',
                                'in': 'callerInGivenChannel',
                                'regexp': 'regexpMatcher',})])


    def _tell(self, irc, msg, args, target, text, notice):
        if irc.nested:
            irc.error('This command cannot be nested.', Raise=True)
        if target.lower() == 'me':
            target = msg.nick
        if irc.isChannel(target):
            irc.error(_('Hey, just give the command.  No need for the tell.'))
            return
        if not ircutils.isNick(target):
            irc.errorInvalid('nick', target)
        if ircutils.nickEqual(target, irc.nick):
            irc.error(_('You just told me, why should I tell myself?'),
                      Raise=True)
        if target not in irc.state.nicksToHostmasks and \
             not ircdb.checkCapability(msg.prefix, 'owner'):
            # We'll let owners do this.
            s = _('I haven\'t seen %s, I\'ll let you do the telling.') % target
            irc.error(s, Raise=True)
        if irc.action:
            irc.action = False
            text = '* %s %s' % (irc.nick, text)
        s = _('%s wants me to tell you: %s') % (msg.nick, text)
        irc.replySuccess()
        irc.reply(s, to=target, private=True, notice=notice)

    @internationalizeDocstring
    def tell(self, *args):
        """<nick> <text>

        Tells the <nick> whatever <text> is.  Use nested commands to your
        benefit here.
        """
        self._tell(*args, notice=False)
    tell = wrap(tell, ['something', 'text'])

    @internationalizeDocstring
    def noticetell(self, *args):
        """<nick> <text>

        Tells the <nick> whatever <text> is, in a notice.  Use nested
        commands to your benefit here.
        """
        self._tell(*args, notice=True)
    noticetell = wrap(noticetell, ['something', 'text'])

    @internationalizeDocstring
    def ping(self, irc, msg, args):
        """takes no arguments

        Checks to see if the bot is alive.
        """
        irc.reply(_('pong'), prefixNick=False)

    @internationalizeDocstring
    def completenick(self, irc, msg, args, channel, beginning, optlist):
        """[<channel>] <beginning> [--match-case]

        Returns the nick of someone on the channel whose nick begins with the
        given <beginning>.
        <channel> defaults to the current channel."""
        if channel not in irc.state.channels:
            irc.error(_('I\'m not even in %s.') % channel, Raise=True)
        if ('match-case', True) in optlist:
            def match(nick):
                return nick.startswith(beginning)
        else:
            beginning = beginning.lower()
            def match(nick):
                return nick.lower().startswith(beginning)
        for nick in irc.state.channels[channel].users:
            if match(nick):
                irc.reply(nick)
                return
        irc.error(_('No such nick.'))
    completenick = wrap(completenick, ['channel', 'something',
                                       getopts({'match-case':''})])

    @internationalizeDocstring
    def clearmores(self, irc, msg, args):
        """takes no arguments

        Clears all mores for the current network."""
        irc._mores.clear()
        irc.replySuccess()
    clearmores = wrap(clearmores, ['admin'])

Class = Misc

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