import uuid

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


class FileIndex(models.Model):
    """Tracks every user file so media stays organized and served only
    through the gated FileRequest endpoint (never direct /media/ access)."""

    uuid = models.UUIDField(default=uuid.uuid4, editable=False, unique=True)
    owner = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='files',
    )
    kind = models.CharField(max_length=64, default='file', db_index=True)
    stored_path = models.CharField(max_length=1024)
    original_filename = models.CharField(max_length=255, blank=True, default='')
    content_type = models.CharField(max_length=128, blank=True, default='')
    size = models.IntegerField(default=0)
    md5 = models.CharField(max_length=32, db_index=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        indexes = [
            models.Index(fields=['owner', 'kind']),
        ]

    def __str__(self):
        return f'{self.kind} {self.uuid} ({self.owner})'

    @property
    def file_path(self):
        return self.stored_path