import logging
import sys

from django.core.management import color_style
from django.core.signals import request_finished
from django.urls import clear_url_caches

from cms.utils.apphook_reload import mark_urlconf_as_changed

logger = logging.getLogger(__name__)

DISPATCH_UID = 'cms-restart'


def trigger_server_restart(**kwargs):
    """
    Marks the URLs as stale so that they can be reloaded.
    """
    mark_urlconf_as_changed()


def set_restart_trigger():
    request_finished.connect(trigger_restart, dispatch_uid=DISPATCH_UID)


def trigger_restart(**kwargs):
    from cms.signals import urls_need_reloading

    request_finished.disconnect(trigger_restart, dispatch_uid=DISPATCH_UID)
    urls_need_reloading.send(sender=None)


def debug_server_restart(**kwargs):
    from cms.appresolver import clear_app_resolvers
    if 'runserver' in sys.argv or 'server' in sys.argv:
        clear_app_resolvers()
        clear_url_caches()
        import cms.urls
        try:
            reload(cms.urls)
        except NameError:  # python3
            from importlib import reload
            reload(cms.urls)
    if 'test' not in sys.argv:
        msg = 'Application url changed and urls_need_reloading signal fired. ' \
              'Please reload the urls.py or restart the server.\n'
        styles = color_style()
        msg = styles.NOTICE(msg)
        sys.stderr.write(msg)