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# blog/models.py
from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone

class Category(models.Model):
    name = models.CharField(max_length=100, unique=True)
    slug = models.SlugField(max_length=100, unique=True)

class Meta:
        verbose_name_plural = 'categories'
        ordering = ['name']

def __str__(self):
        return self.name

class Post(models.Model):
    STATUS_DRAFT     = 'draft'
    STATUS_PUBLISHED = 'published'
    STATUS_CHOICES   = [
        (STATUS_DRAFT,     'Draft'),
        (STATUS_PUBLISHED, 'Published'),
    ]

title      = models.CharField(max_length=200)
    slug       = models.SlugField(max_length=200, unique_for_date='published_at')
    author     = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')
    category   = models.ForeignKey(Category, on_delete=models.SET_NULL, null=True, blank=True)
    body       = models.TextField()
    status     = models.CharField(max_length=10, choices=STATUS_CHOICES, default=STATUS_DRAFT)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    published_at = models.DateTimeField(null=True, blank=True)

class Meta:
        ordering = ['-published_at']
        indexes  = [models.Index(fields=['-published_at'])]

def __str__(self):
        return self.title