# history_tracking/models.py
from django.db import models
from django.contrib.contenttypes.models import ContentType
from django.contrib.contenttypes.fields import GenericForeignKey
from simple_history.models import HistoricalRecords
from .mixins import HistoricalChangeMixin
from typing import Any, Type, TypeVar, cast

T = TypeVar('T', bound=models.Model)

class HistoricalModel(models.Model):
    """Abstract base class for models with history tracking"""
    history: HistoricalRecords = HistoricalRecords(inherit=True)

    class Meta:
        abstract = True

    @property
    def _history_model(self) -> Type[T]:
        """Get the history model class"""
        return cast(Type[T], self.history.model)  # type: ignore

class HistoricalSlug(models.Model):
    """Track historical slugs for models"""
    content_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
    object_id = models.PositiveIntegerField()
    content_object = GenericForeignKey('content_type', 'object_id')
    slug = models.SlugField(max_length=255)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        unique_together = ('content_type', 'slug')
        indexes = [
            models.Index(fields=['content_type', 'object_id']),
            models.Index(fields=['slug']),
        ]

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