# The MIT License (MIT)
#
# Copyright (c) 2014 Max Holtzberg <mh@uvc.de>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

import decimal
from lxml import etree
import re
import sys
import urllib2


class Field(object):
    def __init__(self, *args, **kwargs):
        self._default = kwargs.get('default', None)
        self._args = args
        self._kwargs = kwargs

    def parse(self, rec):
        for prefix in [''] + rec._prefixes:
            for path in self._args:
                node = rec._data.find(prefix + path, namespaces=rec._namespaces)
                if node is not None:
                    return self._convert(node)

        return self._default


class Bool(Field):
    _neg = False
    def _convert(self, node):
        if 'equals' in self._kwargs:
            res = self._kwargs['equals'] == node.text
        else:
            res = bool(node.text)
        return res ^ self._neg

    def __invert__(self):
        self._neg = True
        return self


class String(Field):
    def __init__(self, *args, **kwargs):
        super(String, self).__init__(*args, **kwargs)
        if 'subst' in kwargs:
            exp, self._sub = kwargs['subst']
            self._exp = re.compile(exp)
        else: