from flask_wtf import FlaskForm
from wtforms import StringField, SubmitField
from wtforms.validators import DataRequired, Length, ValidationError
from geruecht.model import User


class RegistrationForm(FlaskForm):
    username = StringField('Name', validators=[DataRequired(), Length(min=2, max=20)])
    submit = SubmitField('Create')

    def validate_username(self, username):

        user = User.query.filter_by(username=username.data).first()

        if user:
            raise ValidationError('Bist du behindert!? Der Name ist vergeben!!')