__copyright__ = "Copyright 2016-2018, Stichting SciPost (SciPost Foundation)"
__license__ = "AGPL v3"


from django.contrib.auth.models import User, Group

from notifications.constants import NOTIFICATION_REFEREE_DEADLINE, NOTIFICATION_REFEREE_OVERDUE
from notifications.models import Notification
from notifications.signals import notify


def notify_new_manuscript_submitted(sender, instance, created, **kwargs):
    """
    Notify the Editorial Administration about a new Submission submitted.
    """
    if created:
        administrators = User.objects.filter(groups__name='Editorial Administrators')
        for user in administrators:
            notify.send(sender=sender, recipient=user, actor=instance.submitted_by,
                        verb=' submitted a new manuscript.', target=instance)


def notify_new_editorial_recommendation(sender, instance, created, **kwargs):
    """
    Notify the Editorial Recommendation about a new Submission submitted.
    """
    if created:
        administrators = User.objects.filter(groups__name='Editorial Administrators')
        editor_in_charge = instance.submission.editor_in_charge
        for user in administrators:
            notify.send(sender=sender, recipient=user, actor=editor_in_charge,
                        verb=' formulated a new Editorial Recommendation.', target=instance)


def notify_new_editorial_assignment(sender, instance, created, **kwargs):
    """
    Notify a College Fellow about a new EIC invitation.
    """
    if created:
        administration = Group.objects.get(name='Editorial Administrators')
        if instance.accepted:
            # A new assignment is auto-accepted if user assigned himself or on resubmission.
            text = ' assigned you Editor-in-charge.'
        else:
            text = ' invited you to become Editor-in-charge.'
        notify.send(sender=sender, recipient=instance.to.user, actor=administration,
                    verb=text, target=instance)


def notify_new_referee_invitation(sender, instance, created, **kwargs):
    """
    Notify a Referee about a new refereeing invitation.
    """
    if created and instance.referee:
        notify.send(sender=sender, recipient=instance.referee.user,
                    actor=instance.submission.editor_in_charge,
                    verb=' would like to invite you to referee a Submission.', target=instance)


def notify_invitation_approaching_deadline(sender, instance, created, **kwargs):
    """
    Notify Referee its unfinished duty is approaching the deadline.
    """
    if instance.referee:
        notifications = Notification.objects.filter(
            recipient=instance.referee.user, internal_type=NOTIFICATION_REFEREE_DEADLINE).unread()
        if not notifications.exists():
            # User doesn't already have a notification to remind him.
            administration = Group.objects.get(name='Editorial Administrators')
            notify.send(sender=sender, recipient=instance.referee.user,
                        actor=administration,
                        verb=(' would like to remind you that your Refereeing Task is '
                              'approaching its deadline, please submit your Report'),
                        target=instance.submission, type=NOTIFICATION_REFEREE_DEADLINE)


def notify_invitation_overdue(sender, instance, created, **kwargs):
    """
    Notify Referee its unfinished duty is overdue.
    """
    if instance.referee:
        notifications = Notification.objects.filter(
            recipient=instance.referee.user, internal_type=NOTIFICATION_REFEREE_OVERDUE).unread()
        if not notifications.exists():
            # User doesn't already have a notification to remind him.
            administration = Group.objects.get(name='Editorial Administrators')
            notify.send(sender=sender, recipient=instance.referee.user,
                        actor=administration,
                        verb=(' would like to remind you that your Refereeing Task is overdue, '
                              'please submit your Report'),
                        target=instance.submission, type=NOTIFICATION_REFEREE_OVERDUE)


def notify_manuscript_accepted(sender, instance, created, **kwargs):
    """
    Notify authors about their manuscript decision.

    instance --- Submission
    """
    college = Group.objects.get(name='Editorial College')
    authors = User.objects.filter(contributor__submissions=instance)
    for user in authors:
        notify.send(sender=sender, recipient=user, actor=college,
                    verb=' has accepted your manuscript for publication.',
                    target=instance)