""" receivers of course_published and library_updated events in order to trigger indexing task """

from datetime import datetime
from pytz import UTC

from django.dispatch import receiver

from xmodule.modulestore.django import SignalHandler
from contentstore.courseware_index import CoursewareSearchIndexer, LibrarySearchIndexer
from contentstore.proctoring import register_proctored_exams
from openedx.core.djangoapps.credit.signals import on_course_publish


@receiver(SignalHandler.course_published)
def listen_for_course_publish(sender, course_key, **kwargs):  # pylint: disable=unused-argument
    """
    Receives publishing signal and performs publishing related workflows, such as
    registering proctored exams, building up credit requirements, and performing
    search indexing
    """

    # first is to registered exams, the credit subsystem will assume that
    # all proctored exams have already been registered, so we have to do that first
    register_proctored_exams(course_key)

    # then call into the credit subsystem (in /openedx/djangoapps/credit)
    # to perform any 'on_publish' workflow
    on_course_publish(course_key)

    # Finally call into the course search subsystem
    # to kick off an indexing action

    if CoursewareSearchIndexer.indexing_is_enabled():
        # import here, because signal is registered at startup, but items in tasks are not yet able to be loaded
        from .tasks import update_search_index

        update_search_index.delay(unicode(course_key), datetime.now(UTC).isoformat())


@receiver(SignalHandler.library_updated)
def listen_for_library_update(sender, library_key, **kwargs):  # pylint: disable=unused-argument
    """
    Receives signal and kicks off celery task to update search index
    """

    if LibrarySearchIndexer.indexing_is_enabled():
        # import here, because signal is registered at startup, but items in tasks are not yet able to be loaded
        from .tasks import update_library_index

        update_library_index.delay(unicode(library_key), datetime.now(UTC).isoformat())