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 Company(TrackedModel):
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique=True)
    website = models.URLField(blank=True)
    headquarters = models.CharField(max_length=255, blank=True)
    description = models.TextField(blank=True)
    total_parks = models.IntegerField(default=0)
    total_rides = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

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

    class Meta:
        verbose_name_plural = 'companies'
        ordering = ['name']

    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)

    @classmethod
    def get_by_slug(cls, slug: str) -> Tuple['Company', bool]:
        """Get company 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='company',
                    slug=slug
                )
                return cls.objects.get(pk=historical.object_id), True
            except (HistoricalSlug.DoesNotExist, cls.DoesNotExist):
                raise cls.DoesNotExist()

@pghistory.track()
class Manufacturer(TrackedModel):
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique=True)
    website = models.URLField(blank=True)
    headquarters = models.CharField(max_length=255, blank=True)
    description = models.TextField(blank=True)
    total_rides = models.IntegerField(default=0)
    total_roller_coasters = models.IntegerField(default=0)
    created_at = models.DateTimeField(auto_now_add=True)
    updated_at = models.DateTimeField(auto_now=True)

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

    class Meta:
        ordering = ['name']

    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)

    @classmethod
    def get_by_slug(cls, slug: str) -> Tuple['Manufacturer', bool]:
        """Get manufacturer 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='manufacturer',
                    slug=slug
                )
                return cls.objects.get(pk=historical.object_id), True
            except (HistoricalSlug.DoesNotExist, cls.DoesNotExist):
                raise cls.DoesNotExist()