from rest_framework import serializers
from location.models import Country, Region, City


class CountrySerializer(serializers.ModelSerializer):
    country_code_2 = serializers.CharField()
    id = serializers.IntegerField()

    class Meta:
        model = Country
        fields = (
            "id",
            "country_code_2",
        )

    def validate(self, data):
        data["code"] = self.get_country_code(data)
        del(data['country_code_2'])

        data['old_id'] = data.pop('id')

        return data

    def create(self, validated_data):
        # Some countries already in database
        try:
            country = Country.objects.get(code=validated_data['code'])
        except Country.DoesNotExists:
            country = Country.objects.create(**validated_data)
        return country

    def get_country_code(self, obj):
        return obj.get("country_code_2")


class RegionSerializer(serializers.ModelSerializer):
    region_code = serializers.CharField()
    subregion_code = serializers.CharField(allow_null=True)
    country_code_2 = serializers.CharField()

    class Meta:
        model = Region
        fields = (
            "region_code",
            "country_code_2",
            "subregion_code"
        )

    def validate(self, data):
        if "subregion" in data and data["subregion"] is not None:
            try:
                parent_region = Region.objects.get(code=str(data['region_code']))
            except Exception as e:
                raise ValueError(f"Parent region error with {data}: {e}")
            data['parent_region'] = parent_region
            data['code'] = str(data.pop('subregion_code'))

        else:
            data['code'] = str(data.pop('region_code'))

        try:
            country = Country.objects.get(code=data['country_code_2'])
        except Exception as e:
            raise ValueError(f"Country error with {data}: {e}")
        data["country"] = country

        del (data['country_code_2'])
        del(data['subregion_code'])

        return data

    def create(self, validated_data):
        # Some regions may be already in database
        try:
            region, _ = Region.objects.get_or_create(**validated_data)
        except Exception as e:
            raise ValueError(f"{validated_data}: {e}")
        return region


class CitySerializer(serializers.ModelSerializer):
    country_code_2 = serializers.CharField()
    subregion_code = serializers.CharField()
    zip_code = serializers.CharField()
    is_island = serializers.IntegerField()
    name = serializers.CharField()

    class Meta:
        model = City
        fields = (
            "country_code_2",
            "subregion_code",
            "zip_code",
            "is_island",
            "name",
        )

    def validate(self, data):
        data = self.set_is_island(data)
        data = self.set_code(data)
        data = self.set_zip_code(data)
        data = self.set_relations(data)
        return data

    def create(self, validated_data):
        return City.objects.create(**validated_data)

    def set_is_island(self, data):
        data['is_island'] = True if "is_island" in data \
                                    and data['is_island'] is not None \
                                    and data['is_island'] > 0 \
            else False
        return data

    def set_code(self, data):
        data['code'] = data.pop('country_code_2')
        return data

    def set_relations(self, data):
        try:
            region = Region.objects.get(code=data['code'])
        except:
            try:
                region = Region.objects.get(code=data['subregion_code'])
            except Exception as e:
                raise ValueError(f"Region not found with {data}: {e}")
        data['region'] = region
        del(data['subregion_code'])

        try:
            country = Country.objects.get(code=data['code'])
        except Exception as e:
            raise ValueError(f"Region not found with {data}: {e}")

        data['country'] = country

        return data

    def set_zip_code(self, data):
        data['postal_code'] = data.pop('zip_code')
        return data