""" make a list of books!! """
from bookwyrm.models.group import GroupMember
from dataclasses import field
from django.apps import apps
from django.db import models
from django.utils import timezone

from bookwyrm import activitypub
from bookwyrm.settings import DOMAIN
from .activitypub_mixin import CollectionItemMixin, OrderedCollectionMixin
from .base_model import BookWyrmModel
from . import fields
from .group import GroupMember

CurationType = models.TextChoices(
    "Curation",
    [
        "closed",
        "open",
        "curated",
        "group"
    ],
)


class List(OrderedCollectionMixin, BookWyrmModel):
    """a list of books"""

    name = fields.CharField(max_length=100)
    user = fields.ForeignKey(
        "User", on_delete=models.PROTECT, activitypub_field="owner"
    )
    description = fields.TextField(blank=True, null=True, activitypub_field="summary")
    privacy = fields.PrivacyField()
    curation = fields.CharField(
        max_length=255, default="closed", choices=CurationType.choices
    )
    group = models.ForeignKey(
        "Group",
        on_delete=models.PROTECT,
        default=None,
        blank=True,
        null=True,
    )
    books = models.ManyToManyField(
        "Edition",
        symmetrical=False,
        through="ListItem",
        through_fields=("book_list", "book"),
    )
    activity_serializer = activitypub.BookList

    def get_remote_id(self):
        """don't want the user to be in there in this case"""
        return f"https://{DOMAIN}/list/{self.id}"

    @property
    def collection_queryset(self):
        """list of books for this shelf, overrides OrderedCollectionMixin"""
        return self.books.filter(listitem__approved=True).order_by("listitem")

    class Meta:
        """default sorting"""

        ordering = ("-updated_date",)


class ListItem(CollectionItemMixin, BookWyrmModel):
    """ok"""

    book = fields.ForeignKey(
        "Edition", on_delete=models.PROTECT, activitypub_field="book"
    )
    book_list = models.ForeignKey("List", on_delete=models.CASCADE)
    user = fields.ForeignKey(
        "User", on_delete=models.PROTECT, activitypub_field="actor"
    )
    notes = fields.TextField(blank=True, null=True)
    approved = models.BooleanField(default=True)
    order = fields.IntegerField()
    endorsement = models.ManyToManyField("User", related_name="endorsers")

    activity_serializer = activitypub.ListItem
    collection_field = "book_list"

    def save(self, *args, **kwargs):
        """create a notification too"""
        created = not bool(self.id)
        super().save(*args, **kwargs)
        # tick the updated date on the parent list
        self.book_list.updated_date = timezone.now()
        self.book_list.save(broadcast=False)

        list_owner = self.book_list.user
        model = apps.get_model("bookwyrm.Notification", require_ready=True)
        # create a notification if somoene ELSE added to a local user's list
        if created and list_owner.local and list_owner != self.user:
            model.objects.create(
                user=list_owner,
                related_user=self.user,
                related_list_item=self,
                notification_type="ADD",
            )

        if self.book_list.group:
            for membership in self.book_list.group.memberships.all():
                if membership.user != self.user:
                    model.objects.create(
                        user=membership.user,
                        related_user=self.user,
                        related_list_item=self,
                        notification_type="ADD"
            )
    def raise_not_deletable(self, viewer):
        """the associated user OR the list owner can delete"""
        if self.book_list.user == viewer:
            return
        # group members can delete items in group lists
        is_group_member = GroupMember.objects.filter(group=self.book_list.group, user=viewer).exists()
        if is_group_member:
            return
        super().raise_not_deletable(viewer)

    class Meta:
        """A book may only be placed into a list once,
        and each order in the list may be used only once"""

        unique_together = (("book", "book_list"), ("order", "book_list"))
        ordering = ("-created_date",)