"""
This module contains the signal handlers of the :py:mod:`osusers` app.

"""
from __future__ import absolute_import, unicode_literals

import logging

from django.db.models.signals import (
    post_delete,
    post_save,
)
from django.dispatch import receiver

from fileservertasks.tasks import (
    delete_file_mail_userdir,
    delete_file_sftp_userdir,
    set_file_ssh_authorized_keys,
    setup_file_mail_userdir,
    setup_file_sftp_userdir,
)
from ldaptasks.tasks import (
    add_ldap_user_to_group,
    create_ldap_group,
    create_ldap_user,
    delete_ldap_group,
    delete_ldap_user,
    remove_ldap_user_from_group,
    set_ldap_user_password,
)
from taskresults.models import TaskResult

from .models import (
    AdditionalGroup,
    Group,
    SshPublicKey,
    User,
    password_set,
)


_LOGGER = logging.getLogger(__name__)


@receiver(password_set, sender=User)
def handle_user_password_set(sender, instance, password, **kwargs):
    taskresult = TaskResult.objects.create_task_result(
        'handle_user_password_set',
        set_ldap_user_password.s(instance.username, password))
    _LOGGER.info(
        'LDAP password change has been requested in task %s',
        taskresult.task_id)


# @receiver(post_save)
# def handle_post_save(sender, **kwargs):
#     _LOGGER.debug(
#         'handling post_save signal for %s with args %s',
#         sender, kwargs)


@receiver(post_save, sender=Group)
def handle_group_created(sender, instance, created, **kwargs):
    if created:
        taskresult = TaskResult.objects.create_task_result(
            'handle_group_created',
            create_ldap_group.s(
                instance.groupname, instance.gid, instance.descr))
        _LOGGER.info(
            'LDAP group creation has been requested in task %s',
            taskresult.task_id)
    _LOGGER.debug(
        'group %s has been %s', instance, created and "created" or "updated")


@receiver(post_save, sender=User)
def handle_user_created(sender, instance, created, **kwargs):
    if created:
        chain = create_ldap_user.s(
            instance.username, instance.uid, instance.group.gid,
            instance.gecos, instance.homedir, instance.shell, None
        ) | setup_file_sftp_userdir.s(
            instance.username
        ) | setup_file_mail_userdir.s(instance.username)
        taskresult = TaskResult.objects.create_task_result(
            'handle_user_created', chain)
        _LOGGER.info(
            'LDAP user creation has been requested in task %s',
            taskresult.task_id)
    _LOGGER.debug(
        'user %s has been %s', instance, created and "created" or "updated")


@receiver(post_save, sender=AdditionalGroup)
def handle_user_added_to_group(sender, instance, created, **kwargs):
    if created:
        taskresult = TaskResult.objects.create_task_result(
            'handle_user_added_to_group',
            add_ldap_user_to_group.s(
                instance.user.username, instance.group.groupname))
        _LOGGER.info(
            'Adding user to LDAP group has been requested in task %s',
            taskresult.task_id)


@receiver(post_save, sender=SshPublicKey)
@receiver(post_delete, sender=SshPublicKey)
def handle_ssh_keys_changed(sender, instance, **kwargs):
    sig = set_file_ssh_authorized_keys.s(
        instance.user.username, [
            str(key) for key in
            SshPublicKey.objects.filter(user=instance.user)])
    taskresult = TaskResult.objects.create_task_result(
        'handle_ssh_keys_changed', sig)
    _LOGGER.info(
        'Change of SSH keys has been requested in task %s',
        taskresult.task_id)


# @receiver(post_delete)
# def handle_post_delete(sender, **kwargs):
#     _LOGGER.debug(
#         'handling post_delete signal for %s with args %s',
#         sender, kwargs)


@receiver(post_delete, sender=Group)
def handle_group_deleted(sender, instance, **kwargs):
    taskresult = TaskResult.objects.create_task_result(
        'handle_group_deleted',
        delete_ldap_group.s(instance.groupname))
    _LOGGER.info(
        'LDAP group deletion has been requested in task %s',
        taskresult.task_id)


@receiver(post_delete, sender=User)
def handle_user_deleted(sender, instance, **kwargs):
    chain = delete_file_mail_userdir.s(
        instance.username
    ) | delete_file_sftp_userdir.s(
        instance.username
    ) | delete_ldap_user.s(instance.username)
    _LOGGER.debug('chain signature %s', chain)
    taskresult = TaskResult.objects.create_task_result(
        'handle_user_deleted', chain)
    _LOGGER.info(
        'LDAP user deletion has been requested in task %s',
        taskresult.task_id)


@receiver(post_delete, sender=AdditionalGroup)
def handle_user_removed_from_group(sender, instance, **kwargs):
    taskresult = TaskResult.objects.create_task_result(
        'handle_user_removed_from_group',
        remove_ldap_user_from_group.s(
            instance.user.username, instance.group.groupname))
    _LOGGER.info(
        'Removing user from LDAP group has been requested in task %s',
        taskresult.task_id)