from __future__ import unicode_literals

from pybtex.style.sorting import BaseSortingStyle


# Copyright (c) 2006-2018  Andrey Golovigin
#
# 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.



class SortingStyle(BaseSortingStyle):

    def sorting_key(self, entry):
        if entry.type in ('book', 'inbook'):
            author_key = self.author_editor_key(entry)
        elif 'author' in entry.persons:
            author_key = self.persons_key(entry.persons['author'])
        else:
            author_key = ''
        return (author_key, entry.fields.get('year', ''), entry.fields.get('title', ''))

    def persons_key(self, persons):
        return '   '.join(self.person_key(person) for person in persons)

    def person_key(self, person):
        return '  '.join((
            ' '.join(person.prelast_names + person.last_names),
            ' '.join(person.first_names + person.middle_names),
            ' '.join(person.lineage_names),
        )).lower()

    def author_editor_key(self, entry):
        if entry.persons.get('author'):
            return self.persons_key(entry.persons['author'])
        elif entry.persons.get('editor'):
            return self.persons_key(entry.persons['editor'])
        else:
            return ''
