from django.db import models
from django.contrib.auth.models import User
from django.utils import timezone

class BlogCategory(models.Model):
    name = models.CharField(max_length=100)
    slug = models.SlugField(unique=True)
    
    def __str__(self):
        return self.name
    
    class Meta:
        verbose_name_plural = "Blog Categories"

class BlogTag(models.Model):
    name = models.CharField(max_length=50)
    slug = models.SlugField(unique=True)
    
    def __str__(self):
        return self.name

class BlogPost(models.Model):
    STATUS = (
        ('draft', 'Draft'),
        ('published', 'Published'),
        ('archived', 'Archived'),
    )
    
    title = models.CharField(max_length=200)
    slug = models.SlugField(unique=True)
    category = models.ForeignKey(BlogCategory, on_delete=models.SET_NULL, null=True, blank=True)
    tags = models.ManyToManyField(BlogTag, blank=True)
    author = models.ForeignKey(User, on_delete=models.CASCADE)
    
    content = models.TextField()
    excerpt = models.TextField(blank=True, help_text="Short summary of the post")
    featured_image = models.ImageField(upload_to='blog_images/', blank=True, null=True)
    
    status = models.CharField(max_length=20, choices=STATUS, default='draft')
    views = models.PositiveIntegerField(default=0)
    
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    published_at = models.DateTimeField(blank=True, null=True)
    
    # SEO
    meta_title = models.CharField(max_length=200, blank=True)
    meta_description = models.TextField(blank=True)
    
    def __str__(self):
        return self.title
    
    def save(self, *args, **kwargs):
        if self.status == 'published' and not self.published_at:
            self.published_at = timezone.now()
        super().save(*args, **kwargs)
    
    class Meta:
        ordering = ['-created_at']