from django.db import models

from apps.core.models import UUIDModel


class AuditEvent(UUIDModel):
    """Immutable audit log entry. Records are never updated or deleted."""

    actor = models.ForeignKey("accounts.User", null=True, blank=True, on_delete=models.SET_NULL)
    action = models.CharField(max_length=120, db_index=True)
    object_type = models.CharField(max_length=120, db_index=True)
    object_id = models.CharField(max_length=120, blank=True, db_index=True)
    ip = models.GenericIPAddressField(null=True, blank=True)
    before = models.JSONField(default=dict, blank=True)
    after = models.JSONField(default=dict, blank=True)
    metadata = models.JSONField(default=dict, blank=True)
    created_at = models.DateTimeField(auto_now_add=True, db_index=True)

    class Meta:
        ordering = ["-created_at"]

    def __str__(self) -> str:
        return f"{self.action} {self.object_type}:{self.object_id}"