# SPDX-License-Identifier: AGPL-3.0-or-later
"""FreedomBox app for configuring Shadowsocks Server."""

from django import forms
from django.utils.translation import gettext_lazy as _

from plinth.utils import format_lazy

METHODS = [('chacha20-ietf-poly1305',
            format_lazy('chacha20-ietf-poly1305 ({})', _('Recommended'))),
           ('aes-256-gcm', format_lazy('aes-256-gcm ({})', _('Recommended'))),
           ('aes-192-gcm', 'aes-192-gcm'), ('aes-128-gcm', 'aes-128-gcm'),
           ('aes-128-ctr', 'aes-128-ctr'), ('aes-192-ctr', 'aes-192-ctr'),
           ('aes-256-ctr', 'aes-256-ctr'), ('aes-128-cfb', 'aes-128-cfb'),
           ('aes-192-cfb', 'aes-192-cfb'), ('aes-256-cfb', 'aes-256-cfb'),
           ('camellia-128-cfb', 'camellia-128-cfb'),
           ('camellia-192-cfb', 'camellia-192-cfb'),
           ('camellia-256-cfb', 'camellia-256-cfb'),
           ('chacha20-ietf', 'chacha20-ietf')]


class TrimmedCharField(forms.CharField):
    """Trim the contents of a CharField."""

    def clean(self, value):
        """Clean and validate the field value."""
        if value:
            value = value.strip()

        return super().clean(value)


class ShadowsocksServerForm(forms.Form):
    """Shadowsocks Server configuration form."""

    password = forms.CharField(
        label=_('Password'),
        help_text=_('Password used to encrypt data. Clients must use the '
                    'same password.'))

    method = forms.ChoiceField(
        label=_('Method'), choices=METHODS,
        help_text=_('Encryption method. Clients must use the same setting.'))