from __future__ import absolute_import

import logging

from django.db.models.signals import post_save, pre_delete, post_delete
from django.dispatch import receiver
from django.utils.translation import ugettext_lazy as _

from documents.models import Document
#from maintenance.api import MaintenanceNamespace
from metadata.models import DocumentMetadata
from navigation.api import (register_sidebar_template,
    bind_links)

from .api import update_indexes, delete_indexes
from .links import (index_setup_list, index_setup_create,
    index_setup_edit, index_setup_delete, index_setup_view,
    template_node_create, template_node_edit, template_node_delete,
    index_parent, document_index_list, rebuild_index_instances,
    index_setup_document_types)
from .models import (Index, IndexTemplateNode, IndexInstanceNode)
from .settings import AVAILABLE_INDEXING_FUNCTIONS

logger = logging.getLogger(__name__)

#namespace = MaintenanceNamespace(_(u'indexes'))
#namespace.create_tool(rebuild_index_instances)


@receiver(post_save, dispatch_uid='document_index_update', sender=Document)
def document_index_update(sender, **kwargs):
    # TODO: save result in index log
    delete_indexes(kwargs['instance'])
    update_indexes(kwargs['instance'])


@receiver(pre_delete, dispatch_uid='document_index_delete', sender=Document)
def document_index_delete(sender, **kwargs):
    # TODO: save result in index log
    delete_indexes(kwargs['instance'])


@receiver(post_save, dispatch_uid='document_metadata_index_update', sender=DocumentMetadata)
def document_metadata_index_update(sender, **kwargs):
    # TODO: save result in index log
    delete_indexes(kwargs['instance'].document)
    update_indexes(kwargs['instance'].document)


@receiver(pre_delete, dispatch_uid='document_metadata_index_delete', sender=DocumentMetadata)
def document_metadata_index_delete(sender, **kwargs):
    # TODO: save result in index log
    delete_indexes(kwargs['instance'].document)


@receiver(post_delete, dispatch_uid='document_metadata_index_post_delete', sender=DocumentMetadata)
def document_metadata_index_post_delete(sender, **kwargs):
    # TODO: save result in index log
    update_indexes(kwargs['instance'].document)


available_indexing_functions_string = (_(u'Available functions: %s') % u','.join([u'%s()' % name for name, function in AVAILABLE_INDEXING_FUNCTIONS.items()])) if AVAILABLE_INDEXING_FUNCTIONS else u''
IndexTemplateNode._meta.get_field('expression').help_text=_(u'Enter a python string expression to be evaluated.%s') % available_indexing_functions_string

register_sidebar_template(['index_instance_list'], 'indexing_help.html')

bind_links([IndexInstanceNode], [index_parent])
bind_links([Document], [document_index_list], menu_name='form_header')
bind_links([Index, 'index_setup_list', 'index_setup_create'], [index_setup_list, index_setup_create], menu_name='secondary_menu')
bind_links([Index], [index_setup_edit, index_setup_delete, index_setup_view, index_setup_document_types])
bind_links([IndexTemplateNode], [template_node_create, template_node_edit, template_node_delete])