thrillwiki_django_no_react/parks/models.py

from django.db import models
from django.urls import reverse
from django.utils.text import slugify
from django.contrib.contenttypes.fields import GenericRelation
from django.core.validators import MinValueValidator, MaxValueValidator
from django.core.exceptions import ValidationError
from decimal import Decimal, ROUND_DOWN, InvalidOperation
from simple_history.models import HistoricalRecords

from companies.models import Company
from media.models import Photo


def normalize_coordinate(value, max_digits, decimal_places):
    """Normalize coordinate to have at most max_digits total digits and decimal_places decimal places"""
    try:
        if value is None:
            return None

        # Convert to Decimal for precise handling
        value = Decimal(str(value))
        # Round to specified decimal places
        value = Decimal(
            value.quantize(Decimal("0." + "0" * decimal_places), rounding=ROUND_DOWN)
        )

        return value
    except (TypeError, ValueError, InvalidOperation):
        return None


def validate_coordinate_digits(value, max_digits, decimal_places):
    """Validate total number of digits in a coordinate value"""
    if value is not None:
        try:
            # Convert to Decimal for precise handling
            value = Decimal(str(value))
            # Round to exactly 6 decimal places
            value = value.quantize(Decimal("0.000001"), rounding=ROUND_DOWN)
            return value
        except (InvalidOperation, TypeError):
            raise ValidationError("Invalid coordinate value.")
    return value


def validate_latitude_digits(value):
    """Validate total number of digits in latitude"""
    return validate_coordinate_digits(value, 9, 6)


def validate_longitude_digits(value):
    """Validate total number of digits in longitude"""
    return validate_coordinate_digits(value, 10, 6)


class Park(models.Model):
    STATUS_CHOICES = [
        ("OPERATING", "Operating"),
        ("CLOSED_TEMP", "Temporarily Closed"),
        ("CLOSED_PERM", "Permanently Closed"),
        ("UNDER_CONSTRUCTION", "Under Construction"),
        ("DEMOLISHED", "Demolished"),
        ("RELOCATED", "Relocated"),
    ]

    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255, unique=True)
    description = models.TextField(blank=True)
    status = models.CharField(
        max_length=20, choices=STATUS_CHOICES, default="OPERATING"
    )

    # Location fields
    latitude = models.DecimalField(
        max_digits=9,
        decimal_places=6,
        null=True,
        blank=True,
        help_text="Latitude coordinate (-90 to 90)",
        validators=[
            MinValueValidator(Decimal("-90")),
            MaxValueValidator(Decimal("90")),
            validate_latitude_digits,
        ],
    )
    longitude = models.DecimalField(
        max_digits=10,
        decimal_places=6,
        null=True,
        blank=True,
        help_text="Longitude coordinate (-180 to 180)",
        validators=[
            MinValueValidator(Decimal("-180")),
            MaxValueValidator(Decimal("180")),
            validate_longitude_digits,
        ],
    )
    street_address = models.CharField(max_length=255, blank=True)
    city = models.CharField(max_length=255, blank=True)
    state = models.CharField(max_length=255, blank=True)
    country = models.CharField(max_length=255, blank=True)
    postal_code = models.CharField(max_length=20, blank=True)

    # Details
    opening_date = models.DateField(null=True, blank=True)
    closing_date = models.DateField(null=True, blank=True)
    operating_season = models.CharField(max_length=255, blank=True)
    size_acres = models.DecimalField(
        max_digits=10, decimal_places=2, null=True, blank=True
    )
    website = models.URLField(blank=True)

    # Statistics
    average_rating = models.DecimalField(
        max_digits=3, decimal_places=2, null=True, blank=True
    )
    total_rides = models.IntegerField(null=True, blank=True)
    total_roller_coasters = models.IntegerField(null=True, blank=True)

    # Relationships
    owner = models.ForeignKey(
        Company, on_delete=models.SET_NULL, null=True, blank=True, related_name="parks"
    )
    photos = GenericRelation(Photo, related_query_name="park")

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True, null=True)
    updated_at = models.DateTimeField(auto_now=True)
    history = HistoricalRecords()

    class Meta:
        ordering = ["name"]

    def __str__(self):
        return self.name

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)

        # Normalize coordinates before saving
        if self.latitude is not None:
            self.latitude = normalize_coordinate(self.latitude, 9, 6)
        if self.longitude is not None:
            self.longitude = normalize_coordinate(self.longitude, 10, 6)

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

    def get_absolute_url(self):
        return reverse("parks:park_detail", kwargs={"slug": self.slug})

    @property
    def formatted_location(self):
        parts = []
        if self.city:
            parts.append(self.city)
        if self.state:
            parts.append(self.state)
        if self.country:
            parts.append(self.country)
        return ", ".join(parts)

    @classmethod
    def get_by_slug(cls, slug):
        """Get park by current or historical slug"""
        try:
            return cls.objects.get(slug=slug), False
        except cls.DoesNotExist:
            # Check historical slugs
            history = cls.history.filter(slug=slug).order_by("-history_date").first()
            if history:
                try:
                    return cls.objects.get(id=history.id), True
                except cls.DoesNotExist:
                    pass
            raise cls.DoesNotExist()


class ParkArea(models.Model):
    park = models.ForeignKey(Park, on_delete=models.CASCADE, related_name="areas")
    name = models.CharField(max_length=255)
    slug = models.SlugField(max_length=255)
    description = models.TextField(blank=True)
    opening_date = models.DateField(null=True, blank=True)
    closing_date = models.DateField(null=True, blank=True)

    # Metadata
    created_at = models.DateTimeField(auto_now_add=True, null=True)
    updated_at = models.DateTimeField(auto_now=True)
    history = HistoricalRecords()

    class Meta:
        ordering = ["name"]
        unique_together = ["park", "slug"]

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

    def save(self, *args, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super().save(*args, **kwargs)

    def get_absolute_url(self):
        return reverse(
            "parks:area_detail",
            kwargs={"park_slug": self.park.slug, "area_slug": self.slug},
        )

    @classmethod
    def get_by_slug(cls, slug):
        """Get area by current or historical slug"""
        try:
            return cls.objects.get(slug=slug), False
        except cls.DoesNotExist:
            # Check historical slugs
            history = cls.history.filter(slug=slug).order_by("-history_date").first()
            if history:
                try:
                    return cls.objects.get(id=history.id), True
                except cls.DoesNotExist:
                    pass
            raise cls.DoesNotExist()