from django.db import models
from django.urls import reverse_lazy
from django.utils.text import slugify


class Category(models.Model):
    title = models.CharField(max_length=40, unique=True)
    slug = models.SlugField(max_length=40, unique=True)
    introduction = models.TextField(blank=True, null=True)
    parent = models.ForeignKey(
        "self", blank=True, null=True, on_delete=models.CASCADE, related_name="children"
    )

    def save(
        self, force_insert=False, force_update=False, using=None, update_fields=None
    ):
        if not self.slug:
            self.slug = slugify(self.title)
        return super(Category, self).save()

    def get_absolute_url(self):
        return reverse_lazy("links:list_category", args=["self.slug"])

    def __str__(self):
        return self.title

    class Meta:
        ordering = ["title"]


class Link(models.Model):
    title = models.CharField(max_length=200, unique=True)
    website = models.URLField(unique=True)
    introduction = models.TextField(blank=True, null=True)
    category = models.ForeignKey(
        Category, on_delete=models.PROTECT, related_name="links"
    )
    followed = models.PositiveIntegerField(default=0)
    created = models.DateTimeField(auto_now_add=True)
    is_published = models.BooleanField(default=False)

    def __str__(self):
        return self.title

    class Meta:
        ordering = ["category", "title"]