"""
Configuration for the ``student`` Django application.
"""


import os

from django.apps import AppConfig
from django.contrib.auth.signals import user_logged_in
from django.db.models.signals import pre_save


class StudentConfig(AppConfig):
    """
    Default configuration for the ``student`` application.
    """
    name = 'student'

    def ready(self):
        from django.contrib.auth.models import update_last_login as django_update_last_login
        user_logged_in.disconnect(django_update_last_login)
        from .signals.receivers import update_last_login
        user_logged_in.connect(update_last_login)

        from django.contrib.auth.models import User
        from .signals.receivers import on_user_updated
        pre_save.connect(on_user_updated, sender=User)

        # The django-simple-history model on CourseEnrollment creates performance
        # problems in testing, we mock it here so that the mock impacts all tests.
        if os.environ.get('DISABLE_COURSEENROLLMENT_HISTORY', False):
            import student.models as student_models
            from mock import MagicMock

            student_models.CourseEnrollment.history = MagicMock()