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


class OperationAuditLog(models.Model):
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.SET_NULL,
        related_name="operation_audit_logs",
    )
    module = models.CharField(max_length=80)
    action = models.CharField(max_length=80)
    target_type = models.CharField(max_length=80)
    target_id = models.CharField(max_length=120, blank=True)
    request_snapshot = models.JSONField(default=dict, blank=True)
    result = models.CharField(max_length=20)
    ip_address = models.GenericIPAddressField(null=True, blank=True)
    user_agent = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        ordering = ["-created_at"]
        indexes = [
            models.Index(fields=["module", "action"]),
            models.Index(fields=["target_type", "target_id"]),
            models.Index(fields=["created_at"]),
        ]

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