"""Tag serializers."""
from rest_framework import serializers
from establishment.models import (Establishment, EstablishmentType,
                                  EstablishmentSubType)
from news.models import News, NewsType
from tag import models
from utils.exceptions import (ObjectAlreadyAdded, BindingObjectNotFound,
                              RemovedBindingObjectNotFound)
from utils.serializers import TranslatedField


class TagBaseSerializer(serializers.ModelSerializer):
    """Serializer for model Tag."""

    # todo: refactor this
    # label_translated = TranslatedField()
    label_translated = serializers.CharField(source='value', read_only=True, allow_null=True)
    index_name = serializers.CharField(source='value', read_only=True, allow_null=True)

    class Meta:
        """Meta class."""

        model = models.Tag
        fields = (
            'id',
            'label_translated',
            'index_name',
        )


class TagBackOfficeSerializer(TagBaseSerializer):
    """Serializer for Tag model for Back office users."""

    class Meta(TagBaseSerializer.Meta):
        """Meta class."""

        fields = TagBaseSerializer.Meta.fields + (
            'label',
            'category'
        )


class TagCategoryBaseSerializer(serializers.ModelSerializer):
    """Serializer for model TagCategory."""

    # todo: refactor this
    # label_translated = TranslatedField()
    label_translated = serializers.CharField(source='index_name', read_only=True, allow_null=True)
    tags = TagBaseSerializer(many=True, read_only=True)

    class Meta:
        """Meta class."""

        model = models.TagCategory
        fields = (
            'id',
            'label_translated',
            'index_name',
            'tags',
        )


class TagCategoryBackOfficeDetailSerializer(TagCategoryBaseSerializer):
    """Tag Category detail serializer for back-office users."""

    country_translated = TranslatedField(source='country.name_translated')

    class Meta(TagCategoryBaseSerializer.Meta):
        """Meta class."""

        fields = TagCategoryBaseSerializer.Meta.fields + (
            'label',
            'country',
            'country_translated',
        )


class TagBindObjectSerializer(serializers.Serializer):
    """Serializer for binding tag category and objects"""

    ESTABLISHMENT = 'establishment'
    NEWS = 'news'

    TYPE_CHOICES = (
        (ESTABLISHMENT, 'Establishment type'),
        (NEWS, 'News type'),
    )

    type = serializers.ChoiceField(TYPE_CHOICES)
    object_id = serializers.IntegerField()

    def validate(self, attrs):
        view = self.context.get('view')
        request = self.context.get('request')

        obj_type = attrs.get('type')
        obj_id = attrs.get('object_id')

        tag = view.get_object()
        attrs['tag'] = tag

        if obj_type == self.ESTABLISHMENT:
            establishment = Establishment.objects.filter(pk=obj_id).first()
            if not establishment:
                raise BindingObjectNotFound()
            if request.method == 'POST' and tag.establishments.filter(
                    pk=establishment.pk).exists():
                raise ObjectAlreadyAdded()
            if request.method == 'DELETE' and not tag.establishments.filter(
                    pk=establishment.pk).exists():
                raise RemovedBindingObjectNotFound()
            attrs['related_object'] = establishment
        elif obj_type == self.NEWS:
            news = News.objects.filter(pk=obj_id).first()
            if not news:
                raise BindingObjectNotFound()
            if request.method == 'POST' and tag.news.filter(pk=news.pk).exists():
                raise ObjectAlreadyAdded()
            if request.method == 'DELETE' and not tag.news.filter(
                    pk=news.pk).exists():
                raise RemovedBindingObjectNotFound()
            attrs['related_object'] = news
        return attrs


class TagCategoryBindObjectSerializer(serializers.Serializer):
    """Serializer for binding tag category and objects"""

    ESTABLISHMENT_TYPE = 'establishment_type'
    NEWS_TYPE = 'news_type'

    TYPE_CHOICES = (
        (ESTABLISHMENT_TYPE, 'Establishment type'),
        (NEWS_TYPE, 'News type'),
    )

    type = serializers.ChoiceField(TYPE_CHOICES)
    object_id = serializers.IntegerField()

    def validate(self, attrs):
        view = self.context.get('view')
        request = self.context.get('request')

        obj_type = attrs.get('type')
        obj_id = attrs.get('object_id')

        tag_category = view.get_object()
        attrs['tag_category'] = tag_category

        if obj_type == self.ESTABLISHMENT_TYPE:
            establishment_type = EstablishmentType.objects.filter(pk=obj_id).\
                first()
            if not establishment_type:
                raise BindingObjectNotFound()
            if request.method == 'POST' and tag_category.establishment_types.\
                    filter(pk=establishment_type.pk).exists():
                raise ObjectAlreadyAdded()
            if request.method == 'DELETE' and not tag_category.\
                    establishment_types.filter(pk=establishment_type.pk).\
                    exists():
                raise RemovedBindingObjectNotFound()
            attrs['related_object'] = establishment_type
        elif obj_type == self.NEWS_TYPE:
            news_type = NewsType.objects.filter(pk=obj_id).first()
            if not news_type:
                raise BindingObjectNotFound()
            if request.method == 'POST' and tag_category.news_types.\
                    filter(pk=news_type.pk).exists():
                raise ObjectAlreadyAdded()
            if request.method == 'DELETE' and not tag_category.news_types.\
                    filter(pk=news_type.pk).exists():
                raise RemovedBindingObjectNotFound()
            attrs['related_object'] = news_type
        return attrs