###
# Copyright (c) 2004, James Vega
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# modification, are permitted provided that the following conditions are met:
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#   * Redistributions of source code must retain the above copyright notice,
#     this list of conditions, and the following disclaimer.
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#     contributors to this software may be used to endorse or promote products
#     derived from this software without specific prior written consent.
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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###

"""
Provides commands which interface with various websites to perform currency
conversions.
"""

import supybot

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

import re

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

class CurrencyCommand(registry.String):
    def setValue(self, s):
        m = Currency.currencyCommands
        if s not in m:
            raise registry.InvalidRegistryValue,\
                  'Command must be one of %s.' % utils.commaAndify(m)
        else:
            method = getattr(Currency, s)
            Currency.convert.im_func.__doc__ = method.__doc__
        registry.String.setValue(self, s)

class Currency(callbacks.Privmsg):
    currencyCommands = ['xe', 'yahoo']
    threaded = True

    _symbolError = 'Currency must be denoted by its three-letter symbol.'
    def convert(self, irc, msg, args):
        # This specifically does not have a docstring.
        channel = None
        if ircutils.isChannel(msg.args[0]):
            channel = msg.args[0]
        realCommandName = self.registryValue('command', channel)
        realCommand = getattr(self, realCommandName)
        realCommand(irc, msg, args)

    _xeCurrError = re.compile(r'The following error occurred:<BR><BR>\s+'
                              r'(.*)</body>', re.I | re.S)
    _xeConvert = re.compile(r'<TD[^>]+><FONT[^>]+>\s+([\d.]+\s+\w{3}\s+='
                            r'\s+[\d.]+\s+\w{3})', re.I | re.S)
    def xe(self, irc, msg, args, number, curr1, curr2):
        """[<number>] <currency1> [to] <currency2>

        Converts from <currency1> to <currency2>.  If number isn't given, it
        defaults to 1.
        """
        if len(curr1) != 3 and len(curr2) != 3:
            irc.error(self._symbolError)
            return
        url = 'http://www.xe.com/ucc/convert.cgi?Amount=%s&From=%s&To=%s'
        try:
            text = webutils.getUrl(url % (number, curr1, curr2))
        except webutils.WebError, e:
            irc.error(str(e))
            return
        err = self._xeCurrError.search(text)
        if err is not None:
            irc.error('You used an incorrect currency symbol.')
            return
        conv = self._xeConvert.search(text)
        if conv is not None:
            resp = conv.group(1).split()
            resp[0] = str(float(resp[0]) * number)
            if resp[0].endswith('.0'):
                resp[0] = '%s.00' % resp[0][:-2]
            resp[3] = str(float(resp[3]) * number)
            irc.reply(' '.join(resp))
            return
        else:
            irc.error('XE must\'ve changed the format of their site.')
            return
    xe = wrap(xe, [optional('float', 1.0), 'lowered', 'to', 'lowered'])

    def yahoo(self, irc, msg, args, number, curr1, curr2):
        """[<number>] <currency1> to <currency2>

        Converts from <currency1> to <currency2>.  If number isn't given, it
        defaults to 1.
        """
        if len(curr1) != 3 and len(curr2) != 3:
            irc.error(self._symbolError)
            return
        url = r'http://finance.yahoo.com/d/quotes.csv?'\
              r's=%s%s=X&f=sl1d1t1ba&e=.csv' % (curr1, curr2)
        try:
            text = webutils.getUrl(url)
        except webutils.WebError, e:
            irc.error(str(e))
            return
        if 'N/A' in text:
            irc.error('You used an incorrect currency symbol.')
            return
        conv = text.split(',')[1]
        conv = number * float(conv)
        irc.reply('%.2f %s = %.2f %s' % (number, curr1, conv, curr2))
    yahoo = wrap(yahoo, [optional('float', 1.0), 'lowered', 'to', 'lowered'])

conf.registerPlugin('Currency')
conf.registerChannelValue(conf.supybot.plugins.Currency, 'command',
    CurrencyCommand('yahoo', """Sets the default command to use when retrieving
    the currency conversion.  Command must be one of %s.""" %
    utils.commaAndify(Currency.currencyCommands, And='or')))

Class = Currency

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