from django.contrib.gis.db import models

class WorldBorder(models.Model):
    # Regular Django fields corresponding to the attributes in the
    # world borders shapefile.
    name = models.CharField(max_length=50)
    area = models.IntegerField()
    pop2005 = models.IntegerField('Population 2005')
    fips = models.CharField('FIPS Code', max_length=2)
    iso2 = models.CharField('2 Digit ISO', max_length=2)
    iso3 = models.CharField('3 Digit ISO', max_length=3)
    un = models.IntegerField('United Nations Code')
    region = models.IntegerField('Region Code')
    subregion = models.IntegerField('Sub-Region Code')
    lon = models.FloatField()
    lat = models.FloatField()

    # GeoDjango-specific: a geometry field (MultiPolygonField)
    mpoly = models.MultiPolygonField()

    # Returns the string representation of the model.
    def __str__(self):
        return self.name

from django.db import models

from owners.models import Owner


class Animal(models.Model):
    name = models.CharField('Pet name', max_length=50)
    breed = models.CharField('Breed',max_length=30)
    age = models.IntegerField('Age', default=0)
    sound = models.CharField('Sound',max_length=10)
    owner = models.ForeignKey(Owner, models.SET_NULL, blank=True, null=True,)

    def __str__(self):
        return f"The {self.name} says {self.sound}"

import uuid

from django.contrib.auth.models import User
from django.db import models


class Owner(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    membership = models.UUIDField(default=uuid.uuid4, editable=False)

    def __str__(self):
        return self.user.get_full_name()

import uuid

from django.contrib.auth.models import User
from django.db import models


class Vet(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    certification = models.UUIDField(default=uuid.uuid4, editable=False)

    def __str__(self):
        return self.user.get_full_name()

import uuid

from django.contrib.gis.db import models

from vets.models import Vet


class Hospital(models.Model):
    chief_vet = models.ForeignKey(Vet, models.SET_NULL, blank=True, null=True)
    name = models.CharField('Name', max_length=255)
    address = models.CharField('Address', max_length=255)
    location = models.PointField()
    license = models.UUIDField(default=uuid.uuid4, editable=False)

    def __str__(self):
        return self.name

from rest_framework import serializers
from rest_framework_gis.serializers import GeoFeatureModelSerializer

from hospitals.models import Hospital


class HospitalSerializer(GeoFeatureModelSerializer):
    class Meta:
        model = Hospital
        geo_field = "location"
        fields = ('name', 'address', 'license')

from django.contrib.gis.geos import GEOSGeometry
from django.contrib.gis.measure import D

from hospitals.models import Hospital

def closest_hospitals_by_location(latitude, longitude, distance=5):
    point_wkt = 'POINT({} {})'.format(longitude, latitude)
    point = GEOSGeometry(point_wkt, srid=4326)
    hospitals = Hospital.objects.filter(
        location__distance_lte=(
            point,
            D(km=distance)
            )
        )
    return hospitals