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

from infrasynth.tenancy.managers import AllObjectsManager


class ModelChangeLog(models.Model):
    tenant = models.ForeignKey(
        "tenancy.Tenant",
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name="+",
        help_text="Null = platform action; set for tenant-scoped actions.",
    )
    model_label = models.CharField(max_length=200, db_index=True)
    object_id = models.CharField(max_length=200, db_index=True)
    action = models.CharField(
        max_length=10,
        choices=[("create", "create"), ("update", "update"), ("delete", "delete")],
    )
    changes = models.JSONField(help_text="Dict with {field_name: [old_value, new_value]}")
    actor = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)
    timestamp = models.DateTimeField(auto_now_add=True, db_index=True)
    request_id = models.CharField(max_length=64, help_text="UUID for request correlation")

    class Meta:
        db_table = "audit_model_change_log"
        indexes = [
            models.Index(fields=["tenant_id", "model_label", "object_id"]),
            models.Index(fields=["tenant_id", "timestamp"]),
        ]

    objects = AllObjectsManager()


class APIInteractionLog(models.Model):
    tenant = models.ForeignKey(
        "tenancy.Tenant",
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name="+",
    )
    method = models.CharField(max_length=10, db_index=True)
    path = models.CharField(max_length=500, db_index=True)
    status_code = models.PositiveSmallIntegerField(db_index=True)
    request_body = models.JSONField(null=True, blank=True)
    response_body = models.JSONField(null=True, blank=True)
    ip_address = models.GenericIPAddressField(null=True)
    actor = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)
    duration_ms = models.PositiveIntegerField()
    timestamp = models.DateTimeField(auto_now_add=True, db_index=True)
    request_id = models.CharField(max_length=64, db_index=True)
    user_agent = models.TextField(blank=True, default="")

    class Meta:
        db_table = "audit_api_interaction_log"
        indexes = [models.Index(fields=["tenant_id", "timestamp"])]

    objects = AllObjectsManager()


class SecurityEvent(models.Model):
    tenant = models.ForeignKey(
        "tenancy.Tenant",
        on_delete=models.CASCADE,
        null=True,
        blank=True,
        related_name="+",
    )
    event_type = models.CharField(max_length=50, db_index=True)
    actor = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.SET_NULL, null=True)
    ip_address = models.GenericIPAddressField(null=True)
    metadata = models.JSONField(default=dict)
    timestamp = models.DateTimeField(auto_now_add=True, db_index=True)
    request_id = models.CharField(max_length=64)

    class Meta:
        db_table = "audit_security_event"
        indexes = [models.Index(fields=["tenant_id", "event_type"])]

    objects = AllObjectsManager()