from django.db import models
from django.utils.text import slugify
from django.urls import reverse
from typing import Tuple, Optional, ClassVar, TYPE_CHECKING
import pghistory
from history_tracking.models import TrackedModel, HistoricalSlug

@pghistory.track()
class Operator(TrackedModel):
    """
    Companies that operate theme parks (replaces Company.owner)
    """
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique=True)
    description = models.TextField(blank=True)
    website = models.URLField(blank=True)
    founded_year = models.PositiveIntegerField(blank=True, null=True)
    headquarters = models.CharField(max_length=255, blank=True)
    parks_count = models.IntegerField(default=0)
    rides_count = models.IntegerField(default=0)

    objects: ClassVar[models.Manager['Operator']]

    class Meta:
        ordering = ['name']
        verbose_name = 'Operator'
        verbose_name_plural = 'Operators'

    def __str__(self) -> str:
        return self.name

    def save(self, *args, **kwargs) -> None:
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)

    def get_absolute_url(self) -> str:
        return reverse('operators:detail', kwargs={'slug': self.slug})

    @classmethod
    def get_by_slug(cls, slug: str) -> Tuple['Operator', bool]:
        """Get operator by slug, checking historical slugs if needed"""
        try:
            return cls.objects.get(slug=slug), False
        except cls.DoesNotExist:
            # Check pghistory first
            history_model = cls.get_history_model()
            history_entry = (
                history_model.objects.filter(slug=slug)
                .order_by('-pgh_created_at')
                .first()
            )
            
            if history_entry:
                return cls.objects.get(id=history_entry.pgh_obj_id), True
            
            # Check manual slug history as fallback
            try:
                historical = HistoricalSlug.objects.get(
                    content_type__model='operator',
                    slug=slug
                )
                return cls.objects.get(pk=historical.object_id), True
            except (HistoricalSlug.DoesNotExist, cls.DoesNotExist):
                raise cls.DoesNotExist()