from __future__ import absolute_import, unicode_literals

from django.contrib.comments.models import Comment
from django.contrib.contenttypes import generic
from django.utils.translation import ugettext_lazy as _

from acls import ModelPermission
from common import MayanAppConfig, menu_facet, menu_object, menu_sidebar
from common.classes import ModelAttribute
from common.utils import encapsulate
from documents.models import Document
from navigation import SourceColumn

from .links import (
    link_comment_add, link_comment_delete, link_comments_for_document
)
from .permissions import (
    permission_comment_create, permission_comment_delete,
    permission_comment_view
)


class DocumentCommentsApp(MayanAppConfig):
    app_namespace = 'comments'
    app_url = 'comments'
    name = 'document_comments'
    verbose_name = _('Document comments')

    def ready(self):
        super(DocumentCommentsApp, self).ready()

        Document.add_to_class(
            'comments',
            generic.GenericRelation(
                Comment,
                content_type_field='content_type',
                object_id_field='object_pk'
            )
        )

        ModelAttribute(
            Document, label=_('Comments'), name='comments', type_name='related'
        )

        SourceColumn(source=Comment, label=_('Date'), attribute='submit_date')
        SourceColumn(
            source=Comment, label=_('User'),
            attribute=encapsulate(lambda x: x.user.get_full_name() if x.user.get_full_name() else x.user)
        )
        SourceColumn(source=Comment, label=_('Comment'), attribute='comment')

        ModelPermission.register(
            model=Document, permissions=(
                permission_comment_create, permission_comment_delete,
                permission_comment_view
            )
        )

        menu_sidebar.bind_links(
            links=[link_comment_add],
            sources=[
                'comments:comments_for_document', 'comments:comment_add',
                'comments:comment_delete', 'comments:comment_multiple_delete'
            ]
        )
        menu_object.bind_links(links=[link_comment_delete], sources=[Comment])
        menu_facet.bind_links(
            links=[link_comments_for_document], sources=[Document]
        )