# Copyright 2021 Canonical, Ltd.
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

import os
from urwid import (
    connect_signal,
    )


from subiquity.common.types import IdentityData
from subiquity.ui.views.identity import (
    IdentityForm,
    IdentityView,
    )
from subiquitycore.ui.utils import screen
from subiquitycore.utils import crypt_password
from subiquitycore.view import BaseView

from subiquity.common.resources import resource_path


class WSLIdentityForm(IdentityForm):

    realname = IdentityForm.realname
    username = IdentityForm.username
    username.help = \
        _("The username does not need to match your Windows username")
    password = IdentityForm.password
    confirm_password = IdentityForm.confirm_password


class WSLIdentityView(BaseView):
    title = IdentityView.title
    excerpt = _("Please create a default UNIX user account. "
                "For more information visit: https://aka.ms/wslusers")

    def __init__(self, controller, identity_data):
        self.controller = controller

        reserved_usernames_path = resource_path('reserved-usernames')
        reserved_usernames = set()
        if os.path.exists(reserved_usernames_path):
            with open(reserved_usernames_path) as fp:
                for line in fp:
                    line = line.strip()
                    if line.startswith('#') or not line:
                        continue
                    reserved_usernames.add(line)
        else:
            reserved_usernames.add('root')

        initial = {
            'realname': identity_data.realname,
            'username': identity_data.username,
            }

        # This is the different form model with IdentityView
        # which prevents us from inheriting it
        self.form = WSLIdentityForm(controller, initial)

        connect_signal(self.form, 'submit', self.done)
        self.form.confirm_password.use_as_confirmation(
                for_field=self.form.password,
                desc=_("Passwords"))

        super().__init__(
            screen(
                self.form.as_rows(),
                [self.form.done_btn],
                excerpt=_(self.excerpt),
                focus_buttons=False))

    def done(self, result):
        self.controller.done(IdentityData(
            realname=self.form.realname.value,
            username=self.form.username.value,
            crypted_password=crypt_password(self.form.password.value),
            ))