from django.conf import settings
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models
from django.utils import timezone
from picklefield import PickledObjectField
from telebot import TeleBot

from feeds.tasks import execute_feed


class Feed(models.Model):
    owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    title = models.CharField(max_length=32)
    chat_id = models.CharField(max_length=33)
    check_interval = models.DurationField(help_text='in seconds')
    last_check = models.DateTimeField(null=True, blank=True)
    last_id = PickledObjectField(null=True, blank=True)
    lock = models.BooleanField(default=False)

    config_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    config_id = models.PositiveIntegerField()
    config = GenericForeignKey('config_type', 'config_id')

    def run_check(self):
        if self.lock:
            return
        if self.last_check and timezone.now() < self.last_check + self.check_interval:
            return

        self.lock = True
        self.save()
        execute_feed.delay(self.pk)

    class Meta:
        unique_together = ('config_type', 'config_id')


class FeedModuleConfig(models.Model):
    _feeds = GenericRelation(Feed, content_type_field='config_type', object_id_field='config_id')

    MODULE_NAME = '<Not set>'

    @property
    def feed(self):
        return self._feeds.get()

    @property
    def content_type(self):
        return ContentType.objects.get_for_model(self.__class__)

    def execute(self, bot: TeleBot, chat_id, last_id):
        raise NotImplementedError()

    class Meta:
        abstract = True