from django.db import models
from rest_framework import permissions
from django.core.validators import MinValueValidator
from backend.models.my_model import MyModel, MyModelSerializer, MyModelViewSet


class Currency(MyModel):
    code = models.CharField(primary_key=True, max_length=15)
    name = models.CharField(max_length=100)
    symbol = models.CharField(max_length=5)
    one_USD_in_this_currency = models.DecimalField(
        max_digits=20,
        decimal_places=6,
        validators=[MinValueValidator(0)]
    )


class CurrencySerializer(MyModelSerializer):
    class Meta:
        model = Currency
        fields = '__all__'


class CurrencyViewSet(MyModelViewSet):
    permission_classes = (permissions.IsAdminUser,)  # TODO : change
    queryset = Currency.objects.all()  # pylint: disable=E1101
    serializer_class = CurrencySerializer