from django.db import models
from django.utils.text import slugify
from config.django import base as settings
from apps.core.models import TrackedModel
from .company import Company
import pghistory

# Shared choices that will be used by multiple models
CATEGORY_CHOICES = [
    ("", "Select ride type"),
    ("RC", "Roller Coaster"),
    ("DR", "Dark Ride"),
    ("FR", "Flat Ride"),
    ("WR", "Water Ride"),
    ("TR", "Transport"),
    ("OT", "Other"),
]

# Legacy alias for backward compatibility
Categories = CATEGORY_CHOICES


@pghistory.track()
class RideModel(TrackedModel):
    """
    Represents a specific model/type of ride that can be manufactured by different
    companies. This serves as a catalog of ride designs that can be referenced
    by individual ride installations.

    For example: B&M Dive Coaster, Vekoma Boomerang, RMC I-Box, etc.
    """

    name = models.CharField(max_length=255, help_text="Name of the ride model")
    slug = models.SlugField(
        max_length=255, help_text="URL-friendly identifier (unique within manufacturer)"
    )
    manufacturer = models.ForeignKey(
        Company,
        on_delete=models.SET_NULL,
        related_name="ride_models",
        null=True,
        blank=True,
        limit_choices_to={"roles__contains": ["MANUFACTURER"]},
        help_text="Primary manufacturer of this ride model",
    )
    description = models.TextField(
        blank=True, help_text="Detailed description of the ride model"
    )
    category = models.CharField(
        max_length=2,
        choices=CATEGORY_CHOICES,
        default="",
        blank=True,
        help_text="Primary category classification",
    )

    # Technical specifications
    typical_height_range_min_ft = models.DecimalField(
        max_digits=6,
        decimal_places=2,
        null=True,
        blank=True,
        help_text="Minimum typical height in feet for this model",
    )
    typical_height_range_max_ft = models.DecimalField(
        max_digits=6,
        decimal_places=2,
        null=True,
        blank=True,
        help_text="Maximum typical height in feet for this model",
    )
    typical_speed_range_min_mph = models.DecimalField(
        max_digits=5,
        decimal_places=2,
        null=True,
        blank=True,
        help_text="Minimum typical speed in mph for this model",
    )
    typical_speed_range_max_mph = models.DecimalField(
        max_digits=5,
        decimal_places=2,
        null=True,
        blank=True,
        help_text="Maximum typical speed in mph for this model",
    )
    typical_capacity_range_min = models.PositiveIntegerField(
        null=True,
        blank=True,
        help_text="Minimum typical hourly capacity for this model",
    )
    typical_capacity_range_max = models.PositiveIntegerField(
        null=True,
        blank=True,
        help_text="Maximum typical hourly capacity for this model",
    )

    # Design characteristics
    track_type = models.CharField(
        max_length=100,
        blank=True,
        help_text="Type of track system (e.g., tubular steel, I-Box, wooden)",
    )
    support_structure = models.CharField(
        max_length=100,
        blank=True,
        help_text="Type of support structure (e.g., steel, wooden, hybrid)",
    )
    train_configuration = models.CharField(
        max_length=200,
        blank=True,
        help_text="Typical train configuration (e.g., 2 trains, 7 cars per train, 4 seats per car)",
    )
    restraint_system = models.CharField(
        max_length=100,
        blank=True,
        help_text="Type of restraint system (e.g., over-shoulder, lap bar, vest)",
    )

    # Market information
    first_installation_year = models.PositiveIntegerField(
        null=True, blank=True, help_text="Year of first installation of this model"
    )
    last_installation_year = models.PositiveIntegerField(
        null=True,
        blank=True,
        help_text="Year of last installation of this model (if discontinued)",
    )
    is_discontinued = models.BooleanField(
        default=False, help_text="Whether this model is no longer being manufactured"
    )
    total_installations = models.PositiveIntegerField(
        default=0, help_text="Total number of installations worldwide (auto-calculated)"
    )

    # Design features
    notable_features = models.TextField(
        blank=True,
        help_text="Notable design features or innovations (JSON or comma-separated)",
    )
    target_market = models.CharField(
        max_length=50,
        blank=True,
        choices=[
            ("FAMILY", "Family"),
            ("THRILL", "Thrill"),
            ("EXTREME", "Extreme"),
            ("KIDDIE", "Kiddie"),
            ("ALL_AGES", "All Ages"),
        ],
        help_text="Primary target market for this ride model",
    )

    # Media
    primary_image = models.ForeignKey(
        "RideModelPhoto",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="ride_models_as_primary",
        help_text="Primary promotional image for this ride model",
    )

    # SEO and metadata
    meta_title = models.CharField(
        max_length=60, blank=True, help_text="SEO meta title (auto-generated if blank)"
    )
    meta_description = models.CharField(
        max_length=160,
        blank=True,
        help_text="SEO meta description (auto-generated if blank)",
    )

    # Frontend URL
    url = models.URLField(blank=True, help_text="Frontend URL for this ride model")

    class Meta(TrackedModel.Meta):
        ordering = ["manufacturer__name", "name"]
        unique_together = [["manufacturer", "name"], ["manufacturer", "slug"]]
        constraints = [
            # Height range validation
            models.CheckConstraint(
                name="ride_model_height_range_logical",
                condition=models.Q(typical_height_range_min_ft__isnull=True)
                | models.Q(typical_height_range_max_ft__isnull=True)
                | models.Q(
                    typical_height_range_min_ft__lte=models.F(
                        "typical_height_range_max_ft"
                    )
                ),
                violation_error_message="Minimum height cannot exceed maximum height",
            ),
            # Speed range validation
            models.CheckConstraint(
                name="ride_model_speed_range_logical",
                condition=models.Q(typical_speed_range_min_mph__isnull=True)
                | models.Q(typical_speed_range_max_mph__isnull=True)
                | models.Q(
                    typical_speed_range_min_mph__lte=models.F(
                        "typical_speed_range_max_mph"
                    )
                ),
                violation_error_message="Minimum speed cannot exceed maximum speed",
            ),
            # Capacity range validation
            models.CheckConstraint(
                name="ride_model_capacity_range_logical",
                condition=models.Q(typical_capacity_range_min__isnull=True)
                | models.Q(typical_capacity_range_max__isnull=True)
                | models.Q(
                    typical_capacity_range_min__lte=models.F(
                        "typical_capacity_range_max"
                    )
                ),
                violation_error_message="Minimum capacity cannot exceed maximum capacity",
            ),
            # Installation years validation
            models.CheckConstraint(
                name="ride_model_installation_years_logical",
                condition=models.Q(first_installation_year__isnull=True)
                | models.Q(last_installation_year__isnull=True)
                | models.Q(
                    first_installation_year__lte=models.F("last_installation_year")
                ),
                violation_error_message="First installation year cannot be after last installation year",
            ),
        ]

    def __str__(self) -> str:
        return (
            self.name
            if not self.manufacturer
            else f"{self.manufacturer.name} {self.name}"
        )

    def save(self, *args, **kwargs) -> None:
        if not self.slug:
            from django.utils.text import slugify

            # Only use the ride model name for the slug, not manufacturer
            base_slug = slugify(self.name)
            self.slug = base_slug

            # Ensure uniqueness within the same manufacturer
            counter = 1
            while (
                RideModel.objects.filter(manufacturer=self.manufacturer, slug=self.slug)
                .exclude(pk=self.pk)
                .exists()
            ):
                self.slug = f"{base_slug}-{counter}"
                counter += 1

        # Auto-generate meta fields if blank
        if not self.meta_title:
            self.meta_title = str(self)[:60]
        if not self.meta_description:
            desc = (
                f"{self} - {self.description[:100]}" if self.description else str(self)
            )
            self.meta_description = desc[:160]

        # Generate frontend URL
        if self.manufacturer:
            frontend_domain = getattr(
                settings, "FRONTEND_DOMAIN", "https://thrillwiki.com"
            )
            self.url = f"{frontend_domain}/rides/manufacturers/{self.manufacturer.slug}/{self.slug}/"

        super().save(*args, **kwargs)

    def update_installation_count(self) -> None:
        """Update the total installations count based on actual ride instances."""
        # Import here to avoid circular import
        from django.apps import apps

        Ride = apps.get_model("rides", "Ride")
        self.total_installations = Ride.objects.filter(ride_model=self).count()
        self.save(update_fields=["total_installations"])

    @property
    def installation_years_range(self) -> str:
        """Get a formatted string of installation years range."""
        if self.first_installation_year and self.last_installation_year:
            return f"{self.first_installation_year}-{self.last_installation_year}"
        elif self.first_installation_year:
            return (
                f"{self.first_installation_year}-present"
                if not self.is_discontinued
                else f"{self.first_installation_year}+"
            )
        return "Unknown"

    @property
    def height_range_display(self) -> str:
        """Get a formatted string of height range."""
        if self.typical_height_range_min_ft and self.typical_height_range_max_ft:
            return f"{self.typical_height_range_min_ft}-{self.typical_height_range_max_ft} ft"
        elif self.typical_height_range_min_ft:
            return f"{self.typical_height_range_min_ft}+ ft"
        elif self.typical_height_range_max_ft:
            return f"Up to {self.typical_height_range_max_ft} ft"
        return "Variable"

    @property
    def speed_range_display(self) -> str:
        """Get a formatted string of speed range."""
        if self.typical_speed_range_min_mph and self.typical_speed_range_max_mph:
            return f"{self.typical_speed_range_min_mph}-{self.typical_speed_range_max_mph} mph"
        elif self.typical_speed_range_min_mph:
            return f"{self.typical_speed_range_min_mph}+ mph"
        elif self.typical_speed_range_max_mph:
            return f"Up to {self.typical_speed_range_max_mph} mph"
        return "Variable"


@pghistory.track()
class RideModelVariant(TrackedModel):
    """
    Represents specific variants or configurations of a ride model.
    For example: B&M Hyper Coaster might have variants like "Mega Coaster", "Giga Coaster"
    """

    ride_model = models.ForeignKey(
        RideModel, on_delete=models.CASCADE, related_name="variants"
    )
    name = models.CharField(max_length=255, help_text="Name of this variant")
    description = models.TextField(
        blank=True, help_text="Description of variant differences"
    )

    # Variant-specific specifications
    min_height_ft = models.DecimalField(
        max_digits=6, decimal_places=2, null=True, blank=True
    )
    max_height_ft = models.DecimalField(
        max_digits=6, decimal_places=2, null=True, blank=True
    )
    min_speed_mph = models.DecimalField(
        max_digits=5, decimal_places=2, null=True, blank=True
    )
    max_speed_mph = models.DecimalField(
        max_digits=5, decimal_places=2, null=True, blank=True
    )

    # Distinguishing features
    distinguishing_features = models.TextField(
        blank=True, help_text="What makes this variant unique from the base model"
    )

    class Meta(TrackedModel.Meta):
        ordering = ["ride_model", "name"]
        unique_together = ["ride_model", "name"]

    def __str__(self) -> str:
        return f"{self.ride_model} - {self.name}"


@pghistory.track()
class RideModelPhoto(TrackedModel):
    """Photos associated with ride models for catalog/promotional purposes."""

    ride_model = models.ForeignKey(
        RideModel, on_delete=models.CASCADE, related_name="photos"
    )
    image = models.ForeignKey(
        'django_cloudflareimages_toolkit.CloudflareImage',
        on_delete=models.CASCADE,
        help_text="Photo of the ride model stored on Cloudflare Images"
    )
    caption = models.CharField(max_length=500, blank=True)
    alt_text = models.CharField(max_length=255, blank=True)

    # Photo metadata
    photo_type = models.CharField(
        max_length=20,
        choices=[
            ("PROMOTIONAL", "Promotional"),
            ("TECHNICAL", "Technical Drawing"),
            ("INSTALLATION", "Installation Example"),
            ("RENDERING", "3D Rendering"),
            ("CATALOG", "Catalog Image"),
        ],
        default="PROMOTIONAL",
    )

    is_primary = models.BooleanField(
        default=False, help_text="Whether this is the primary photo for the ride model"
    )

    # Attribution
    photographer = models.CharField(max_length=255, blank=True)
    source = models.CharField(max_length=255, blank=True)
    copyright_info = models.CharField(max_length=255, blank=True)

    class Meta(TrackedModel.Meta):
        ordering = ["-is_primary", "-created_at"]

    def __str__(self) -> str:
        return f"Photo of {self.ride_model.name}"

    def save(self, *args, **kwargs) -> None:
        # Ensure only one primary photo per ride model
        if self.is_primary:
            RideModelPhoto.objects.filter(
                ride_model=self.ride_model, is_primary=True
            ).exclude(pk=self.pk).update(is_primary=False)
        super().save(*args, **kwargs)


@pghistory.track()
class RideModelTechnicalSpec(TrackedModel):
    """
    Technical specifications for ride models that don't fit in the main model.
    This allows for flexible specification storage.
    """

    ride_model = models.ForeignKey(
        RideModel, on_delete=models.CASCADE, related_name="technical_specs"
    )

    spec_category = models.CharField(
        max_length=50,
        choices=[
            ("DIMENSIONS", "Dimensions"),
            ("PERFORMANCE", "Performance"),
            ("CAPACITY", "Capacity"),
            ("SAFETY", "Safety Features"),
            ("ELECTRICAL", "Electrical Requirements"),
            ("FOUNDATION", "Foundation Requirements"),
            ("MAINTENANCE", "Maintenance"),
            ("OTHER", "Other"),
        ],
    )

    spec_name = models.CharField(max_length=100, help_text="Name of the specification")
    spec_value = models.CharField(
        max_length=255, help_text="Value of the specification"
    )
    spec_unit = models.CharField(
        max_length=20, blank=True, help_text="Unit of measurement"
    )
    notes = models.TextField(
        blank=True, help_text="Additional notes about this specification"
    )

    class Meta(TrackedModel.Meta):
        ordering = ["spec_category", "spec_name"]
        unique_together = ["ride_model", "spec_category", "spec_name"]

    def __str__(self) -> str:
        unit_str = f" {self.spec_unit}" if self.spec_unit else ""
        return f"{self.ride_model.name} - {self.spec_name}: {self.spec_value}{unit_str}"


@pghistory.track()
class Ride(TrackedModel):
    """Model for individual ride installations at parks

    Note: The average_rating field is denormalized and refreshed by background
    jobs. Use selectors or annotations for real-time calculations if needed.
    """

    STATUS_CHOICES = [
        ("", "Select status"),
        ("OPERATING", "Operating"),
        ("CLOSED_TEMP", "Temporarily Closed"),
        ("SBNO", "Standing But Not Operating"),
        ("CLOSING", "Closing"),
        ("CLOSED_PERM", "Permanently Closed"),
        ("UNDER_CONSTRUCTION", "Under Construction"),
        ("DEMOLISHED", "Demolished"),
        ("RELOCATED", "Relocated"),
    ]

    POST_CLOSING_STATUS_CHOICES = [
        ("SBNO", "Standing But Not Operating"),
        ("CLOSED_PERM", "Permanently Closed"),
    ]

    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255)
    description = models.TextField(blank=True)
    park = models.ForeignKey(
        "parks.Park", on_delete=models.CASCADE, related_name="rides"
    )
    park_area = models.ForeignKey(
        "parks.ParkArea",
        on_delete=models.SET_NULL,
        related_name="rides",
        null=True,
        blank=True,
    )
    category = models.CharField(
        max_length=2, choices=CATEGORY_CHOICES, default="", blank=True
    )
    manufacturer = models.ForeignKey(
        Company,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="manufactured_rides",
        limit_choices_to={"roles__contains": ["MANUFACTURER"]},
    )
    designer = models.ForeignKey(
        Company,
        on_delete=models.SET_NULL,
        related_name="designed_rides",
        null=True,
        blank=True,
        limit_choices_to={"roles__contains": ["DESIGNER"]},
    )
    ride_model = models.ForeignKey(
        "RideModel",
        on_delete=models.SET_NULL,
        related_name="rides",
        null=True,
        blank=True,
        help_text="The specific model/type of this ride",
    )
    status = models.CharField(
        max_length=20, choices=STATUS_CHOICES, default="OPERATING"
    )
    post_closing_status = models.CharField(
        max_length=20,
        choices=POST_CLOSING_STATUS_CHOICES,
        null=True,
        blank=True,
        help_text="Status to change to after closing date",
    )
    opening_date = models.DateField(null=True, blank=True)
    closing_date = models.DateField(null=True, blank=True)
    status_since = models.DateField(null=True, blank=True)
    min_height_in = models.PositiveIntegerField(null=True, blank=True)
    max_height_in = models.PositiveIntegerField(null=True, blank=True)
    capacity_per_hour = models.PositiveIntegerField(null=True, blank=True)
    ride_duration_seconds = models.PositiveIntegerField(null=True, blank=True)
    average_rating = models.DecimalField(
        max_digits=3, decimal_places=2, null=True, blank=True
    )

    # Image settings - references to existing photos
    banner_image = models.ForeignKey(
        "RidePhoto",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="rides_using_as_banner",
        help_text="Photo to use as banner image for this ride",
    )
    card_image = models.ForeignKey(
        "RidePhoto",
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name="rides_using_as_card",
        help_text="Photo to use as card image for this ride",
    )

    # Frontend URL
    url = models.URLField(blank=True, help_text="Frontend URL for this ride")
    park_url = models.URLField(
        blank=True, help_text="Frontend URL for this ride's park"
    )

    class Meta(TrackedModel.Meta):
        ordering = ["name"]
        unique_together = ["park", "slug"]
        constraints = [
            # Business rule: Closing date must be after opening date
            models.CheckConstraint(
                name="ride_closing_after_opening",
                condition=models.Q(closing_date__isnull=True)
                | models.Q(opening_date__isnull=True)
                | models.Q(closing_date__gte=models.F("opening_date")),
                violation_error_message="Closing date must be after opening date",
            ),
            # Business rule: Height requirements must be logical
            models.CheckConstraint(
                name="ride_height_requirements_logical",
                condition=models.Q(min_height_in__isnull=True)
                | models.Q(max_height_in__isnull=True)
                | models.Q(min_height_in__lte=models.F("max_height_in")),
                violation_error_message="Minimum height cannot exceed maximum height",
            ),
            # Business rule: Height requirements must be reasonable (between 30
            # and 90 inches)
            models.CheckConstraint(
                name="ride_min_height_reasonable",
                condition=models.Q(min_height_in__isnull=True)
                | (models.Q(min_height_in__gte=30) & models.Q(min_height_in__lte=90)),
                violation_error_message=(
                    "Minimum height must be between 30 and 90 inches"
                ),
            ),
            models.CheckConstraint(
                name="ride_max_height_reasonable",
                condition=models.Q(max_height_in__isnull=True)
                | (models.Q(max_height_in__gte=30) & models.Q(max_height_in__lte=90)),
                violation_error_message=(
                    "Maximum height must be between 30 and 90 inches"
                ),
            ),
            # Business rule: Rating must be between 1 and 10
            models.CheckConstraint(
                name="ride_rating_range",
                condition=models.Q(average_rating__isnull=True)
                | (models.Q(average_rating__gte=1) & models.Q(average_rating__lte=10)),
                violation_error_message="Average rating must be between 1 and 10",
            ),
            # Business rule: Capacity and duration must be positive
            models.CheckConstraint(
                name="ride_capacity_positive",
                condition=models.Q(capacity_per_hour__isnull=True)
                | models.Q(capacity_per_hour__gt=0),
                violation_error_message="Hourly capacity must be positive",
            ),
            models.CheckConstraint(
                name="ride_duration_positive",
                condition=models.Q(ride_duration_seconds__isnull=True)
                | models.Q(ride_duration_seconds__gt=0),
                violation_error_message="Ride duration must be positive",
            ),
        ]

    def __str__(self) -> str:
        return f"{self.name} at {self.park.name}"

    def save(self, *args, **kwargs) -> None:
        # Handle slug generation and conflicts
        if not self.slug:
            self.slug = slugify(self.name)

        # Check for slug conflicts when park changes or slug is new
        original_ride = None
        if self.pk:
            try:
                original_ride = Ride.objects.get(pk=self.pk)
            except Ride.DoesNotExist:
                pass

        # If park changed or this is a new ride, ensure slug uniqueness within the park
        park_changed = original_ride and original_ride.park_id != self.park_id
        if not self.pk or park_changed:
            self._ensure_unique_slug_in_park()

        # Handle park area validation when park changes
        if park_changed and self.park_area:
            # Check if park_area belongs to the new park
            if self.park_area.park_id != self.park_id:
                # Clear park_area if it doesn't belong to the new park
                self.park_area = None

        # Generate frontend URLs
        if self.park:
            frontend_domain = getattr(
                settings, "FRONTEND_DOMAIN", "https://thrillwiki.com"
            )
            self.url = f"{frontend_domain}/parks/{self.park.slug}/rides/{self.slug}/"
            self.park_url = f"{frontend_domain}/parks/{self.park.slug}/"

        super().save(*args, **kwargs)

    def _ensure_unique_slug_in_park(self) -> None:
        """Ensure the ride's slug is unique within its park."""
        base_slug = slugify(self.name)
        self.slug = base_slug

        counter = 1
        while (
            Ride.objects.filter(park=self.park, slug=self.slug)
            .exclude(pk=self.pk)
            .exists()
        ):
            self.slug = f"{base_slug}-{counter}"
            counter += 1

    def move_to_park(self, new_park, clear_park_area=True):
        """
        Move this ride to a different park with proper handling of related data.

        Args:
            new_park: The new Park instance to move the ride to
            clear_park_area: Whether to clear park_area (default True, since areas are park-specific)

        Returns:
            dict: Summary of changes made
        """
        from django.apps import apps

        old_park = self.park
        old_url = self.url
        old_park_area = self.park_area

        # Update park
        self.park = new_park

        # Handle park area
        if clear_park_area:
            self.park_area = None

        # Save will handle slug conflicts and URL updates
        self.save()

        # Return summary of changes
        changes = {
            'old_park': {
                'id': old_park.id,
                'name': old_park.name,
                'slug': old_park.slug
            },
            'new_park': {
                'id': new_park.id,
                'name': new_park.name,
                'slug': new_park.slug
            },
            'url_changed': old_url != self.url,
            'old_url': old_url,
            'new_url': self.url,
            'park_area_cleared': clear_park_area and old_park_area is not None,
            'old_park_area': {
                'id': old_park_area.id,
                'name': old_park_area.name
            } if old_park_area else None,
            'slug_changed': self.slug != slugify(self.name),
            'final_slug': self.slug
        }

        return changes


@pghistory.track()
class RollerCoasterStats(models.Model):
    """Model for tracking roller coaster specific statistics"""

    TRACK_MATERIAL_CHOICES = [
        ("STEEL", "Steel"),
        ("WOOD", "Wood"),
        ("HYBRID", "Hybrid"),
    ]

    COASTER_TYPE_CHOICES = [
        ("SITDOWN", "Sit Down"),
        ("INVERTED", "Inverted"),
        ("FLYING", "Flying"),
        ("STANDUP", "Stand Up"),
        ("WING", "Wing"),
        ("DIVE", "Dive"),
        ("FAMILY", "Family"),
        ("WILD_MOUSE", "Wild Mouse"),
        ("SPINNING", "Spinning"),
        ("FOURTH_DIMENSION", "4th Dimension"),
        ("OTHER", "Other"),
    ]

    LAUNCH_CHOICES = [
        ("CHAIN", "Chain Lift"),
        ("LSM", "LSM Launch"),
        ("HYDRAULIC", "Hydraulic Launch"),
        ("GRAVITY", "Gravity"),
        ("OTHER", "Other"),
    ]

    ride = models.OneToOneField(
        Ride, on_delete=models.CASCADE, related_name="coaster_stats"
    )
    height_ft = models.DecimalField(
        max_digits=6, decimal_places=2, null=True, blank=True
    )
    length_ft = models.DecimalField(
        max_digits=7, decimal_places=2, null=True, blank=True
    )
    speed_mph = models.DecimalField(
        max_digits=5, decimal_places=2, null=True, blank=True
    )
    inversions = models.PositiveIntegerField(default=0)
    ride_time_seconds = models.PositiveIntegerField(null=True, blank=True)
    track_type = models.CharField(max_length=255, blank=True)
    track_material = models.CharField(
        max_length=20,
        choices=TRACK_MATERIAL_CHOICES,
        default="STEEL",
        blank=True,
    )
    roller_coaster_type = models.CharField(
        max_length=20,
        choices=COASTER_TYPE_CHOICES,
        default="SITDOWN",
        blank=True,
    )
    max_drop_height_ft = models.DecimalField(
        max_digits=6, decimal_places=2, null=True, blank=True
    )
    launch_type = models.CharField(
        max_length=20, choices=LAUNCH_CHOICES, default="CHAIN"
    )
    train_style = models.CharField(max_length=255, blank=True)
    trains_count = models.PositiveIntegerField(null=True, blank=True)
    cars_per_train = models.PositiveIntegerField(null=True, blank=True)
    seats_per_car = models.PositiveIntegerField(null=True, blank=True)

    class Meta:
        verbose_name = "Roller Coaster Statistics"
        verbose_name_plural = "Roller Coaster Statistics"

    def __str__(self) -> str:
        return f"Stats for {self.ride.name}"