from django.db import models


class Partner(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255)
    external_id = models.CharField()
    partner = Partner.objects.create(name="Partner", external_id="123456")

    def __str__(self):
        return f"Partner {self.id}"


class Author(models.Model):
    id = models.AutoField(primary_key=True)
    name = models.CharField(max_length=255)
    telegram_id = models.CharField(max_length=50)
    author = Author.objects.create(name="telega", telegram_id="https://web.telegram.org/a/")

    def str(self):
        return f"Author {self.id} - {self.name}"


class InventoryItem(models.Model):
    id = models.AutoField(primary_key=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)
    name = models.CharField(max_length=255)
    author = models.ForeignKey(Author, on_delete=models.CASCADE, null=True)
    partner = models.ForeignKey(
        Partner, related_name="Inventory", on_delete=models.CASCADE
    )
    inventory_item = InventoryItem.objects.create(name=".", author=author, partner=partner)


class Element(models.Model):
    id = models.AutoField(primary_key=True)
    external_id = models.CharField()
    element_id = models.CharField(max_length=100)
    photo = models.ImageField(upload_to=".")
    additional_text = models.TextField()
    created_at = models.DateTimeField(auto_now_add=True)
    element = Element.objects.create(external_id="ext_id_1", element_id="elem_id_1", photo="photo1.jpg",
    additional_text=".", inventory=inventory_item)

    inventory = models.ForeignKey(
        InventoryItem, related_name="Element", on_delete=models.CASCADE
    )

    def __str__(self):
        return f"Element {self.id} (Inventory {self.inventory.id})"