###
# Copyright (c) 2002, Jeremiah Fincher
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###

"""
Lots of stuff relating to random numbers.
"""

import supybot.plugins as plugins

import time
import random

import supybot.conf as conf
import supybot.utils as utils
from supybot.commands import *
import supybot.ircmsgs as ircmsgs
import supybot.ircutils as ircutils
import supybot.registry as registry
import supybot.callbacks as callbacks


def configure(advanced):
    from supybot.questions import expect, anything, something, yn
    conf.registerPlugin('Random', True)
    if yn('Do you want to specify a seed to be used for the RNG'):
        seed = something('What seed?  It must be an integer or long.')
        while not seed.isdigit():
            print 'That\'s not a valid seed.'
            seed = something('What seed?')
        conf.supybot.plugins.Random.seed.setValue(seed)

class Seed(registry.Integer):
    def __call__(self):
        v = registry.Integer.__call__(self)
        if not v:
            v = int(time.time())
        return v

    def serialize(self):
        # We do this so if it's 0, it doesn't store a real time.
        return str(self.value)

conf.registerPlugin('Random')
conf.registerGlobalValue(conf.supybot.plugins.Random, 'seed', Seed(0, """
Sets the seed of the random number generator.  The seed must be a valid
Python integer or long.  If the seed is 0, a seed based on the current
time will be used."""))

class Random(callbacks.Privmsg):
    def __init__(self):
        self.rng = random.Random(self.registryValue('seed'))
        super(Random, self).__init__()

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

        Returns the next random number from the random number
        generator.
        """
        irc.reply(str(self.rng.random()))
    random = wrap(random)

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

        Sets the seed of the random number generator.  <seed> must be an int
        or a long.
        """
        self.rng.seed(seed)
        irc.replySuccess()
    seed = wrap(seed, ['long'])

    def range(self, irc, msg, args, start, end):
        """<start> <end>

        Returns a number between <start> and <end>, inclusive (i.e., the number
        can be either of the endpoints.
        """
        # .randrange() doesn't include the endpoint, so we use end+1.
        irc.reply(str(self.rng.randrange(start, end+1)))
    range = wrap(range, ['int', 'int'])

    def sample(self, irc, msg, args, n, items):
        """<number of items> [<text> ...]

        Returns a sample of the <number of items> taken from the remaining
        arguments.  Obviously <number of items> must be less than the number
        of arguments given.
        """
        if n > len(items):
            irc.error('<number of items> must be less than the number '
                      'of arguments.')
            return
        sample = self.rng.sample(items, n)
        sample.sort()
        irc.reply(utils.commaAndify(sample))
    sample = wrap(sample, ['int', many('anything')])

    def diceroll(self, irc, msg, args, n):
        """[<number of sides>]

        Rolls a die with <number of sides> sides.  The default number of
        sides is 6.
        """
        s = 'rolls a %s' % self.rng.randrange(1, n)
        irc.reply(s, action=True)
    diceroll = wrap(diceroll, [additional(('int', 'number of sides'), 6)])

Class = Random

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