from django.db import models
from django.utils.translation import gettext_lazy as _
from django.db.models import CASCADE, F
from django.core.exceptions import ObjectDoesNotExist

from judge.models import Profile, Comment
from judge.caching import cache_wrapper


category_to_verbose_message = {
    "Add blog": _("Added a post"),
    "Added to group": _("You are added to a group"),
    "Comment": _("You have a new comment"),
    "Delete blog": _("Deleted a post"),
    "Reject blog": _("Rejected a post"),
    "Approve blog": _("Approved a post"),
    "Edit blog": _("Edited a post"),
    "Mention": _("Mentioned you"),
    "Reply": _("Replied you"),
    "Ticket": _("Ticket"),
}


class Notification(models.Model):
    owner = models.ForeignKey(
        Profile,
        verbose_name=_("owner"),
        related_name="notifications",
        on_delete=CASCADE,
    )
    time = models.DateTimeField(verbose_name=_("posted time"), auto_now_add=True)
    category = models.CharField(verbose_name=_("category"), max_length=1000)
    html_link = models.TextField(
        default="",
        verbose_name=_("html link to comments, used for non-comments"),
        max_length=1000,
    )
    author = models.ForeignKey(
        Profile,
        null=True,
        verbose_name=_("who trigger, used for non-comment"),
        on_delete=CASCADE,
    )

    def verbose_activity(self):
        if self.category in category_to_verbose_message:
            return category_to_verbose_message[self.category]

        if "Problem public" in self.category:
            is_public = "True" in self.category
            if "(" in self.category and ")" in self.category:
                groups = self.category.split("(", 1)[1].strip(")")
                if is_public:
                    verbose_message = _("The problem is public to: ") + groups
                else:
                    verbose_message = _("The problem is private to: ") + groups
            else:
                verbose_message = (
                    _("The problem is public to everyone.")
                    if is_public
                    else _("The problem is private.")
                )

            return verbose_message

        return self.category


class NotificationProfile(models.Model):
    unread_count = models.IntegerField(default=0)
    user = models.OneToOneField(Profile, on_delete=CASCADE)


def make_notification(to_users, category, html_link, author):
    for user in to_users:
        if user == author:
            continue
        notif = Notification(
            owner=user, category=category, html_link=html_link, author=author
        )
        notif.save()
        NotificationProfile.objects.get_or_create(user=user)
        NotificationProfile.objects.filter(user=user).update(
            unread_count=F("unread_count") + 1
        )
        unseen_notifications_count.dirty(user)


@cache_wrapper(prefix="unc")
def unseen_notifications_count(profile):
    try:
        return NotificationProfile.objects.get(user=profile).unread_count
    except ObjectDoesNotExist:
        return 0