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


class MediaItem(models.Model):
    """A logical media file, identified by its MD5 fingerprint."""

    md5 = models.CharField(max_length=32, unique=True)
    size = models.BigIntegerField(default=0)
    # Custom rating: "s" (safe), "q" (questionable), "e" (explicit) or "" (unrated).
    rating = models.CharField(max_length=1, blank=True, default="")
    tags = models.JSONField(default=list, blank=True)
    notes = models.TextField(blank=True, default="")
    uploaded_by = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="uploads",
    )
    # Guests never see items whose tags hit the mirrored default blacklist.
    hidden_from_guests = models.BooleanField(default=False, db_index=True)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ["-created_at"]

    def __str__(self):
        return f"J-{self.pk} ({self.md5})"

    def save(self, *args, **kwargs):
        from .guest_filter import item_hidden_from_guests

        self.hidden_from_guests = item_hidden_from_guests(self.tags)
        super().save(*args, **kwargs)


class MediaLocation(models.Model):
    """A physical copy of a media item inside the watched folder."""

    item = models.ForeignKey(
        MediaItem, related_name="locations", on_delete=models.CASCADE
    )
    path = models.CharField(max_length=1024)
    rel_path = models.CharField(max_length=1024)
    mtime = models.FloatField(default=0)

    class Meta:
        unique_together = ("item", "path")
        ordering = ["rel_path"]

    def __str__(self):
        return self.rel_path