from typing import TYPE_CHECKING

from django.contrib import admin as django_admin
from django.contrib.admin.exceptions import AlreadyRegistered  # type: ignore
from django.db import models


class tBUser(models.Model):
    username = models.CharField(max_length=30, unique=True, primary_key=True)

    if TYPE_CHECKING:
        posts = models.Manager["tBPost"]

    def __str__(self) -> str:
        return self.username

class tBPost(models.Model):
    u_by = models.ForeignKey(tBUser, on_delete=models.CASCADE, related_name="posts")
    url = models.CharField(max_length=250)
    title =  models.TextField(max_length=1_000)
    content = models.TextField(max_length=500_000)
    timestamp = models.IntegerField()
    text_format = models.CharField(max_length=10) # plain, mono, markdown, html ... (more to come?)

    class Meta:
        unique_together = ("u_by", "url")

try:
    django_admin.site.register((tBUser, tBPost))
except AlreadyRegistered:
    ...