from __future__ import unicode_literals
from django.db import transaction
from django.db.models.signals import m2m_changed
from django.db.models.signals import post_save
from django.db.models.signals import pre_save
from django.db.models.signals import post_delete
from django.db.models.signals import pre_delete
from django.dispatch import receiver
from django.contrib.auth.models import User
import logging
from services.tasks import update_jabber_groups
from services.tasks import update_mumble_groups
from services.tasks import update_forum_groups
from services.tasks import update_ipboard_groups
from services.tasks import update_discord_groups
from services.tasks import update_teamspeak3_groups
from services.tasks import update_discourse_groups
from services.tasks import update_smf_groups
from authentication.tasks import set_state
from authentication.tasks import disable_member
from authentication.models import AuthServicesInfo
from services.models import AuthTS

logger = logging.getLogger(__name__)


@receiver(m2m_changed, sender=User.groups.through)
def m2m_changed_user_groups(sender, instance, action, *args, **kwargs):
    logger.debug("Received m2m_changed from %s groups with action %s" % (instance, action))

    def trigger_service_group_update():
        logger.debug("Triggering service group update for %s" % instance)
        auth, c = AuthServicesInfo.objects.get_or_create(user=instance)
        if auth.jabber_username:
            update_jabber_groups.delay(instance.pk)
        if auth.teamspeak3_uid:
            update_teamspeak3_groups.delay(instance.pk)
        if auth.forum_username:
            update_forum_groups.delay(instance.pk)
        if auth.smf_username:
            update_smf_groups.delay(instance.pk)
        if auth.ipboard_username:
            update_ipboard_groups.delay(instance.pk)
        if auth.discord_uid:
            update_discord_groups.delay(instance.pk)
        if auth.mumble_username:
            update_mumble_groups.delay(instance.pk)
        if auth.discourse_enabled:
            update_discourse_groups.delay(instance.pk)
        if auth.smf_username:
            update_smf_groups.delay(instance.pk)

    if action == "post_add" or action == "post_remove" or action == "post_clear":
        logger.debug("Waiting for commit to trigger service group update for %s" % instance)
        transaction.on_commit(trigger_service_group_update)


def trigger_all_ts_update():
    for auth in AuthServicesInfo.objects.filter(teamspeak3_uid__isnull=False):
        update_teamspeak3_groups.delay(auth.user.pk)


@receiver(m2m_changed, sender=AuthTS.ts_group.through)
def m2m_changed_authts_group(sender, instance, action, *args, **kwargs):
    logger.debug("Received m2m_changed from %s ts_group with action %s" % (instance, action))
    if action == "post_add" or action == "post_remove":
        trigger_all_ts_update()


@receiver(post_save, sender=AuthTS)
def post_save_authts(sender, instance, *args, **kwargs):
    logger.debug("Received post_save from %s" % instance)
    trigger_all_ts_update()


@receiver(post_delete, sender=AuthTS)
def post_delete_authts(sender, instance, *args, **kwargs):
    logger.debug("Received post_delete signal from %s" % instance)
    trigger_all_ts_update()


@receiver(pre_delete, sender=User)
def pre_delete_user(sender, instance, *args, **kwargs):
    logger.debug("Received pre_delete from %s" % instance)
    disable_member(instance)


@receiver(pre_save, sender=User)
def pre_save_user(sender, instance, *args, **kwargs):
    logger.debug("Received pre_save from %s" % instance)
    # check if user is being marked active/inactive
    if not instance.pk:
        # new model being created
        return
    try:
        old_instance = User.objects.get(pk=instance.pk)
        if old_instance.is_active and not instance.is_active:
            logger.info("Disabling services for inactivation of user %s" % instance)
            disable_member(instance)
        elif instance.is_active and not old_instance.is_active:
            logger.info("Assessing state of reactivated user %s" % instance)
            set_state(instance)
    except User.DoesNotExist:
        pass