# Copyright 2010-2020 Kurt McKee <contactme@kurtmckee.org>
# Copyright 2002-2008 Mark Pilgrim
# All rights reserved.
#
# This file is a part of feedparser.
#
# 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.
#
# 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 warnings


class FeedParserDict(dict):
    keymap = {
        'channel': 'feed',
        'items': 'entries',
        'guid': 'id',
        'date': 'updated',
        'date_parsed': 'updated_parsed',
        'description': ['summary', 'subtitle'],
        'description_detail': ['summary_detail', 'subtitle_detail'],
        'url': ['href'],
        'modified': 'updated',
        'modified_parsed': 'updated_parsed',
        'issued': 'published',
        'issued_parsed': 'published_parsed',
        'copyright': 'rights',
        'copyright_detail': 'rights_detail',
        'tagline': 'subtitle',
        'tagline_detail': 'subtitle_detail',
    }

    def __getitem__(self, key):
        """
        :return: A :class:`FeedParserDict`.
        """

        if key == 'category':
            try:
                return dict.__getitem__(self, 'tags')[0]['term']
            except IndexError:
                raise KeyError("object doesn't have key 'category'")
        elif key == 'enclosures':
            norel = lambda link: FeedParserDict([(name, value) for (name, value) in link.items() if name != 'rel'])
            return [
                norel(link)
                for link in dict.__getitem__(self, 'links')
                if link['rel'] == 'enclosure'
            ]
        elif key == 'license':
            for link in dict.__getitem__(self, 'links'):
                if link['rel'] == 'license' and 'href' in link:
                    return link['href']
        elif key == 'updated':
            # Temporarily help developers out by keeping the old
            # broken behavior that was reported in issue 310.
            # This fix was proposed in issue 328.
            if (
                    not dict.__contains__(self, 'updated')
                    and dict.__contains__(self, 'published')
            ):
                warnings.warn(
                    "To avoid breaking existing software while "
                    "fixing issue 310, a temporary mapping has been created "
                    "from `updated` to `published` if `updated` doesn't "
                    "exist. This fallback will be removed in a future version "
                    "of feedparser.",
                    DeprecationWarning,
                )
                return dict.__getitem__(self, 'published')
            return dict.__getitem__(self, 'updated')
        elif key == 'updated_parsed':
            if (
                    not dict.__contains__(self, 'updated_parsed')
                    and dict.__contains__(self, 'published_parsed')
            ):
                warnings.warn(
                    "To avoid breaking existing software while "
                    "fixing issue 310, a temporary mapping has been created "
                    "from `updated_parsed` to `published_parsed` if "
                    "`updated_parsed` doesn't exist. This fallback will be "
                    "removed in a future version of feedparser.",
                    DeprecationWarning,
                )
                return dict.__getitem__(self, 'published_parsed')
            return dict.__getitem__(self, 'updated_parsed')
        else:
            realkey = self.keymap.get(key, key)
            if isinstance(realkey, list):
                for k in realkey:
                    if dict.__contains__(self, k):
                        return dict.__getitem__(self, k)
            elif dict.__contains__(self, realkey):
                return dict.__getitem__(self, realkey)
        return dict.__getitem__(self, key)

    def __contains__(self, key):
        if key in ('updated', 'updated_parsed'):
            # Temporarily help developers out by keeping the old
            # broken behavior that was reported in issue 310.
            # This fix was proposed in issue 328.
            return dict.__contains__(self, key)
        try:
            self.__getitem__(key)
        except KeyError:
            return False
        else:
            return True

    has_key = __contains__

    def get(self, key, default=None):
        """
        :return: A :class:`FeedParserDict`.
        """

        try:
            return self.__getitem__(key)
        except KeyError:
            return default

    def __setitem__(self, key, value):
        key = self.keymap.get(key, key)
        if isinstance(key, list):
            key = key[0]
        return dict.__setitem__(self, key, value)

    def setdefault(self, k, default):
        if k not in self:
            self[k] = default
            return default
        return self[k]

    def __getattr__(self, key):
        # __getattribute__() is called first; this will be called
        # only if an attribute was not already found
        try:
            return self.__getitem__(key)
        except KeyError:
            raise AttributeError("object has no attribute '%s'" % key)

    def __hash__(self):
        # This is incorrect behavior -- dictionaries shouldn't be hashable.
        # Note to self: remove this behavior in the future.
        return id(self)