from rest_framework.exceptions import ValidationError
from rest_framework.serializers import ModelSerializer

from app_be.models import Feed


class FeedSerializer(ModelSerializer):
    class Meta:
        model = Feed
        fields = '__all__'

    def validate_icon(self, value):
        if value is not None and value.size > 10240:
            raise ValidationError("Invalid icon: Maximum size is 10KB")
        return value

    def validate_keywords(self, value):
        split = [x.strip() for x in value.split(',')]
        if len(split) > 3:
            raise ValidationError("Invalid keywords: No more than three entries")
        elif len(split) == 0:
            raise ValidationError("Invalid keywords: Need at least one entry")
        for entry in split:
            if len(entry) < 3:
                raise ValidationError("Invalid keywords: Keywords have to be of length greater than 2")
        return value