from django.conf import settings
from django.db.models.signals import post_save, post_delete
from django_statsd.clients import statsd

from .celery import register_celery_events


if getattr(settings, 'STATSD_CELERY_SIGNALS', False):
    register_celery_events()


def model_save(sender, **kwargs):
    """
    Handle ``save`` events of all Django models.
    """
    instance = kwargs.get('instance')

    # Increase statsd counter.
    statsd.incr('models.%s.%s.%s' % (
        instance._meta.app_label,
        instance._meta.object_name,
        'create' if kwargs.get('created', False) else 'update',
    ))


def model_delete(sender, **kwargs):
    """
    Handle ``delete`` events of all Django models.
    """
    instance = kwargs.get('instance')

    # Increase statsd counter.
    statsd.incr('models.%s.%s.delete' % (
        instance._meta.app_label,
        instance._meta.object_name,
    ))

if getattr(settings, 'STATSD_MODEL_SIGNALS', True):
    post_save.connect(model_save)
    post_delete.connect(model_delete)