'''
Custom forms/formfields for the Save Point Radio project.
'''

from django.core import validators
from django.forms.fields import URLField


ALLOWED_SCHEMES = ['http', 'https', 'file', 'ftp', 'ftps', 's3']


class RadioIRIFormField(URLField):
    '''
    A custom URL form field that allows schemes that match those from
    Liquidsoap. This is necessary due to a bug in how Django currently
    handles custom URLFields:

    https://code.djangoproject.com/ticket/25594
    https://stackoverflow.com/questions/41756572/
    '''

    # TODO: Because of a shortcoming of Django's URLValidator code, the
    # 'file://' scheme does not validate properly on most cases due to
    # incompatibilities with optional hostnames. Disabling the custom field
    # for now until I can figure out a non-lethal way of handling this.
    # https://code.djangoproject.com/ticket/25595

    default_validators = [validators.URLValidator(schemes=ALLOWED_SCHEMES)]