import uuid

from django.conf import settings
from django.db import models


class TimeStampedModel(models.Model):
    """Abstract base with created/updated timestamps."""

    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        abstract = True


class UUIDPrimaryKeyModel(models.Model):
    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

    class Meta:
        abstract = True


class StoredFile(UUIDPrimaryKeyModel, TimeStampedModel):
    """Binary file blob in the database (no filesystem media storage)."""

    class Kind(models.TextChoices):
        CAMPAIGN_IMAGE = "campaign_image", "Campaign image"
        SOCIAL_IMAGE = "social_image", "Social image"
        SOCIAL_VIDEO = "social_video", "Social video"
        INVOICE_PDF = "invoice_pdf", "Invoice PDF"

    kind = models.CharField(
        max_length=32, choices=Kind.choices, default=Kind.CAMPAIGN_IMAGE
    )
    filename = models.CharField(max_length=255, blank=True)
    content_type = models.CharField(max_length=128)
    size = models.PositiveIntegerField(default=0)
    data = models.BinaryField()
    uploaded_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="uploaded_files",
    )

    class Meta:
        ordering = ["-created_at"]

    def __str__(self) -> str:
        return self.filename or str(self.pk)