#
# spyne - Copyright (C) Spyne contributors.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
#

"""The ``spyne.protocol.yaml`` package contains the Yaml-related protocols.
Currently, only :class:`spyne.protocol.yaml.YamlDocument` is supported.

Initially released in 2.10.0-rc.
"""

from __future__ import absolute_import

import logging
logger = logging.getLogger(__name__)

from spyne import ValidationError
from spyne.util import six
from spyne.model.binary import BINARY_ENCODING_BASE64
from spyne.model.primitive import Boolean
from spyne.model.primitive import Integer
from spyne.model.primitive import Double
from spyne.model.fault import Fault
from spyne.protocol.dictdoc import HierDictDocument

import yaml

from yaml.parser import ParserError
try:
    from yaml import CLoader as Loader
    from yaml import CDumper as Dumper
    from yaml import CSafeLoader as SafeLoader
    from yaml import CSafeDumper as SafeDumper

except ImportError:
    from yaml import Loader
    from yaml import Dumper
    from yaml import SafeLoader
    from yaml import SafeDumper


NON_NUMBER_TYPES = tuple({list, dict, six.text_type, six.binary_type})


class YamlDocument(HierDictDocument):
    """An implementation of the Yaml protocol that uses the PyYaml package.
    See ProtocolBase ctor docstring for its arguments. Yaml-specific arguments
    follow:

    :param safe: Use ``safe_dump`` instead of ``dump`` and ``safe_load`` instead
    of ``load``. This is not a security feature, search for 'safe_dump' in
    http://www.pyyaml.org/wiki/PyYAMLDocumentation
    :param kwargs: See the yaml documentation in ``load, ``safe_load``, ``dump``
    or ``safe_dump`` depending on whether you use yaml as an input or output
    protocol.

    For the output case, Spyne sets ``default_flow_style=False`` and
    ``indent=4`` by default.
    """

    mime_type = 'text/yaml'

    type = set(HierDictDocument.type)
    type.add('yaml')

    text_based = True

    default_binary_encoding = BINARY_ENCODING_BASE64

    # for test classes
    _decimal_as_string = True

    def __init__(self, app=None, validator=None, mime_type=None,
                                        ignore_uncap=False,
                                        # DictDocument specific
                                        ignore_wrappers=True,
                                        complex_as=dict,
                                        ordered=False,
                                        polymorphic=False,
                                        # YamlDocument specific
                                        safe=True,
                                        encoding='UTF-8',
                                        allow_unicode=True,
                                        **kwargs):

        super(YamlDocument, self).__init__(app, validator, mime_type,
                ignore_uncap, ignore_wrappers, complex_as, ordered, polymorphic)

        self._from_unicode_handlers[Double] = self._ret_number
        self._from_unicode_handlers[Boolean] = self._ret_bool
        self._from_unicode_handlers[Integer] = self._ret_number

        self._to_unicode_handlers[Double] = self._ret
        self._to_unicode_handlers[Boolean] = self._ret
        self._to_unicode_handlers[Integer] = self._ret

        loader = Loader
        dumper = Dumper
        if safe:
            loader = SafeLoader
            dumper =  SafeDumper

        self.in_kwargs = dict(kwargs)
        self.out_kwargs = dict(kwargs)

        self.in_kwargs['Loader'] = loader
        self.out_kwargs['Dumper'] = dumper

        loader.add_constructor('tag:yaml.org,2002:python/unicode',
                                                                _unicode_loader)

        self.out_kwargs['encoding'] = encoding
        self.out_kwargs['allow_unicode'] = allow_unicode

        if not 'indent' in self.out_kwargs:
            self.out_kwargs['indent'] = 4

        if not 'default_flow_style' in self.out_kwargs:
            self.out_kwargs['default_flow_style'] = False

    def _ret(self, _, value):
        return value

    def _ret_number(self, _, value):
        if isinstance(value, NON_NUMBER_TYPES):
            raise ValidationError(value)
        if value in (True, False):
            return int(value)
        return value

    def _ret_bool(self, _, value):
        if value is None or value in (True, False):
            return value
        raise ValidationError(value)

    def create_in_document(self, ctx, in_string_encoding=None):
        """Sets ``ctx.in_document``  using ``ctx.in_string``."""

        if in_string_encoding is None:
            in_string_encoding = 'UTF-8'

        try:
            try:
                s = b''.join(ctx.in_string).decode(in_string_encoding)
            except TypeError:
                s = ''.join(ctx.in_string)

            ctx.in_document = yaml.load(s, **self.in_kwargs)

        except ParserError as e:
            raise Fault('Client.YamlDecodeError', repr(e))

    def create_out_string(self, ctx, out_string_encoding='utf8'):
        """Sets ``ctx.out_string`` using ``ctx.out_document``."""

        ctx.out_string = (yaml.dump(o, **self.out_kwargs)
                                                      for o in ctx.out_document)
        if six.PY2 and out_string_encoding is not None:
            ctx.out_string = (
                yaml.dump(o, **self.out_kwargs).encode(out_string_encoding)
                                                      for o in ctx.out_document)


def _unicode_loader(loader, node):
    return node.value


def _decimal_to_bytes():
    pass


def _decimal_from_bytes():
    pass