from django import forms
from decimal import Decimal, InvalidOperation, ROUND_DOWN
from .models import Park


class ParkForm(forms.ModelForm):
    """Form for creating and updating Park objects with location support"""

    class Meta:
        model = Park
        fields = [
            "name",
            "description",
            "owner",
            "status",
            "opening_date",
            "closing_date",
            "operating_season",
            "size_acres",
            "website",
            "latitude",
            "longitude",
            "street_address",
            "city",
            "state",
            "country",
            "postal_code",
        ]
        widgets = {
            "name": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "description": forms.Textarea(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-textarea dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                    "rows": 2,
                }
            ),
            "owner": forms.Select(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-select dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "status": forms.Select(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-select dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "opening_date": forms.DateInput(
                attrs={
                    "type": "date",
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                }
            ),
            "closing_date": forms.DateInput(
                attrs={
                    "type": "date",
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                }
            ),
            "operating_season": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                    "placeholder": "e.g., Year-round, Summer only, etc.",
                }
            ),
            "size_acres": forms.NumberInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                    "step": "0.01",
                    "min": "0",
                }
            ),
            "website": forms.URLInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white",
                    "placeholder": "https://example.com",
                }
            ),
            # Location fields
            "latitude": forms.HiddenInput(),
            "longitude": forms.HiddenInput(),
            "street_address": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "city": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "state": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "country": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
            "postal_code": forms.TextInput(
                attrs={
                    "class": "w-full border-gray-300 rounded-lg form-input dark:border-gray-600 dark:bg-gray-700 dark:text-white"
                }
            ),
        }

    def clean_latitude(self):
        latitude = self.cleaned_data.get('latitude')
        if latitude is not None:
            try:
                # Convert to Decimal for precise handling
                latitude = Decimal(str(latitude))
                # Round to exactly 6 decimal places
                latitude = latitude.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)
                
                # Validate range
                if latitude < -90 or latitude > 90:
                    raise forms.ValidationError("Latitude must be between -90 and 90 degrees.")
                
                # Convert to string to preserve exact decimal places
                return str(latitude)
            except (InvalidOperation, TypeError):
                raise forms.ValidationError("Invalid latitude value.")
        return latitude

    def clean_longitude(self):
        longitude = self.cleaned_data.get('longitude')
        if longitude is not None:
            try:
                # Convert to Decimal for precise handling
                longitude = Decimal(str(longitude))
                # Round to exactly 6 decimal places
                longitude = longitude.quantize(Decimal('0.000001'), rounding=ROUND_DOWN)
                
                # Validate range
                if longitude < -180 or longitude > 180:
                    raise forms.ValidationError("Longitude must be between -180 and 180 degrees.")
                
                # Convert to string to preserve exact decimal places
                return str(longitude)
            except (InvalidOperation, TypeError):
                raise forms.ValidationError("Invalid longitude value.")
        return longitude