"""
notifications utils file
"""
# third party imports
from fcm_django.models import FCMDevice
from celery import shared_task
from firebase_admin.messaging import Message, Notification as FirebaseNotification

# django imports
from django.contrib.auth import get_user_model
from django.db.models import Q

# local imports
from account.models import UserNotification
from account.utils import get_user_full_name
from base.constants import GUARDIAN, JUNIOR
from guardian.models import Guardian, JuniorTask
from junior.models import Junior
from notifications.constants import NOTIFICATION_DICT
from notifications.models import Notification


User = get_user_model()


def register_fcm_token(user_id, registration_id, device_id, device_type):
    """ used to register the fcm device token"""
    device, _ = FCMDevice.objects.update_or_create(device_id=device_id,
                                                   defaults={'user_id': user_id, 'type': device_type,
                                                             'active': True,
                                                             'registration_id': registration_id})
    return device


def remove_fcm_token(user_id: int, access_token: str, registration_id) -> None:
    """
    remove access_token and registration_token
    """
    try:
        # remove fcm token for this device
        FCMDevice.objects.filter(user_id=user_id).delete()
    except Exception as e:
        print(e)


def get_from_user_details(from_user_id, from_user_type):
    """
    used to get from user details
    """
    from_user = None
    from_user_name = None
    from_user_image = None
    if from_user_id:
        if from_user_type == GUARDIAN:
            guardian = Guardian.objects.filter(user_id=from_user_id).select_related('user').first()
            from_user = guardian.user
            from_user_name = get_user_full_name(from_user)
            from_user_image = guardian.image
        elif from_user_type == JUNIOR:
            junior = Junior.objects.filter(auth_id=from_user_id).select_related('auth').first()
            from_user = junior.auth
            from_user_name = get_user_full_name(from_user)
            from_user_image = junior.image
    return from_user_name, from_user_image, from_user


def get_notification_data(notification_type, from_user_id, from_user_type, to_user_id, extra_data):
    """
    get notification and push data
    :param from_user_type: GUARDIAN or JUNIOR
    :param notification_type: notification_type
    :param from_user_id: from_user obj
    :param to_user_id: to_user obj
    :param extra_data: any extra data provided
    :return: notification and push data
    """
    push_data = NOTIFICATION_DICT[notification_type].copy()
    notification_data = push_data.copy()
    task_name = None
    if 'task_id' in extra_data:
        task = JuniorTask.objects.filter(id=extra_data.get('task_id')).first()
        task_name = task.task_name
        extra_data['task_name'] = task_name
        extra_data['task_image'] = task.image if task.image else task.default_image

    from_user_name, from_user_image, from_user = get_from_user_details(from_user_id, from_user_type)

    push_data['body'] = push_data['body'].format(from_user=from_user_name, task_name=task_name)
    notification_data['body'] = notification_data['body'].format(from_user=from_user_name, task_name=task_name)
    notification_data['from_user'] = from_user_name
    notification_data['from_user_image'] = from_user_image

    notification_data.update(extra_data)
    to_user = User.objects.get(id=to_user_id)
    return notification_data, push_data, from_user, to_user


@shared_task()
def send_notification(notification_type, from_user_id, from_user_type, to_user_id, extra_data):
    """
    used to send the push for the given notification type
    """
    notification_data, push_data, from_user, to_user = get_notification_data(notification_type, from_user_id,
                                                                             from_user_type, to_user_id, extra_data)
    user_notification_type = UserNotification.objects.filter(user=to_user).first()
    notification_data.update({'badge': Notification.objects.filter(notification_to=to_user, is_read=False).count()})
    Notification.objects.create(notification_type=notification_type, notification_from=from_user,
                                notification_to=to_user, data=notification_data)
    if user_notification_type and user_notification_type.push_notification:
        send_push(to_user, push_data)


def send_push(user, data):
    """ used to send push notification to specific user """
    user.fcmdevice_set.filter(active=True).send_message(
        Message(notification=FirebaseNotification(data['title'], data['body']), data=data)
    )


def send_multiple_push(queryset, data):
    """ used to send same notification to multiple users """
    FCMDevice.objects.filter(user__in=queryset, active=True).send_message(
        Message(notification=FirebaseNotification(data['title'], data['body']), data=data)
    )


@shared_task()
def send_notification_multiple_user(notification_type, from_user_id, from_user_type,
                                    extra_data: dict = {}):
    """
    used to send notification to multiple user for the given notification type
    """
    to_user_list = User.objects.filter(junior_profile__is_verified=True, is_superuser=False
                                       ).exclude(junior_profile__isnull=True, guardian_profile__isnull=True)

    push_data = NOTIFICATION_DICT[notification_type].copy()
    notification_data = push_data.copy()
    points = extra_data.get('points', None)
    from_user_name, from_user_image, from_user = get_from_user_details(from_user_id, from_user_type)
    push_data['body'] = push_data['body'].format(from_user=from_user_name, points=points)
    notification_data['body'] = notification_data['body'].format(from_user=from_user_name,
                                                                 points=points)
    notification_data['from_user'] = from_user_name
    notification_data['from_user_image'] = from_user_image
    notification_list = []
    for user in to_user_list:
        notification_list.append(Notification(notification_type=notification_type,
                                              notification_to=user,
                                              notification_from=from_user,
                                              data=notification_data))
    Notification.objects.bulk_create(notification_list)
    to_user_list = to_user_list.filter(user_notification__push_notification=True)
    send_multiple_push(to_user_list, push_data)


@shared_task()
def send_notification_to_guardian(notification_type, from_user_id, to_user_id, extra_data):
    """
    :param notification_type:
    :param from_user_id:
    :param to_user_id:
    :param extra_data:
    :return:
    """
    if from_user_id:
        from_user = Junior.objects.filter(auth_id=from_user_id).first()
        extra_data['from_user_image'] = from_user.image
    send_notification(notification_type, from_user_id, to_user_id, extra_data)


@shared_task()
def send_notification_to_junior(notification_type, from_user_id, to_user_id, extra_data):
    """
    :param notification_type:
    :param from_user_id:
    :param to_user_id:
    :param extra_data:
    :return:
    """
    if from_user_id:
        from_user = Guardian.objects.filter(user_id=from_user_id).first()
        extra_data['from_user_image'] = from_user.image
    send_notification(notification_type, from_user_id, to_user_id, extra_data)