from __future__ import unicode_literals

from django.apps import apps
from django.utils.translation import ugettext_lazy as _

from documents.literals import DEFAULT_DOCUMENT_TYPE_LABEL

from .tasks import task_delete_empty_index_nodes, task_index_document


def create_default_document_index(sender, **kwargs):
    DocumentType = apps.get_model(
        app_label='documents', model_name='DocumentType'
    )
    Index = apps.get_model(
        app_label='document_indexing', model_name='Index'
    )

    index = Index.objects.create(
        label=_('Creation date'), slug='creation_date'
    )
    for document_type in DocumentType.objects.all():
        index.document_types.add(document_type)

    root_template_node = index.template_root
    node = root_template_node.get_children().create(
        expression='{{ document.date_added|date:"Y" }}', index=index,
        parent=root_template_node
    )
    node.get_children().create(
        expression='{{ document.date_added|date:"m" }}',
        index=index, link_documents=True, parent=node
    )


def document_created_index_update(sender, **kwargs):
    task_index_document.apply_async(
        kwargs=dict(document_id=kwargs['instance'].pk)
    )


def document_index_delete(sender, **kwargs):
    task_delete_empty_index_nodes.apply_async()


def document_metadata_index_update(sender, **kwargs):
    task_index_document.apply_async(
        kwargs=dict(document_id=kwargs['instance'].document.pk)
    )


def document_metadata_index_post_delete(sender, **kwargs):
    task_index_document.apply_async(
        kwargs=dict(document_id=kwargs['instance'].document.pk)
    )