from constance import config
from constance.admin import get_values, ConstanceForm
from rest_framework import serializers
from rest_framework.fields import SkipField
from collections import OrderedDict


def _set_constance_value(key, value):
    form = ConstanceForm(initial=get_values())
    field = form.fields[key]
    clean_value = field.clean(field.to_python(value))
    setattr(config, key, clean_value)


class ConfigSerializer(serializers.Serializer):
    SERVICE_COMMISSION = serializers.IntegerField(required=False)
    SERVICE_DISCOUNT_MIN_AMOUNT = serializers.IntegerField(required=False)
    SERVICE_DISCOUNT = serializers.IntegerField(required=False)
    INSTAGRAM_CLIENT_ACCESS_TOKEN = serializers.CharField(required=False)
    INSTAGRAM_CLIENT_SECRET = serializers.CharField(required=False)
    INSTAGRAM_PROFILE_URL = serializers.CharField(required=False)
    # SCHOOL_LOGO_IMAGE = serializers.ImageField(required=False)

    def to_representation(self, instance):
        ret = OrderedDict()
        fields = self._readable_fields
        for field in fields:
            attribute = instance.get(field.field_name)
            ret[field.field_name] = field.to_representation(attribute)
        return ret

    def to_internal_value(self, data):
        ret = OrderedDict(get_values())
        for k, v in data.items():
            ret[k] = v
        return ret

    def update(self, instance, validated_data):
        for k, v in validated_data.items():
            _set_constance_value(k, v)