#
# This file is part of FreedomBox.
#
# 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/>.
#
"""
Tests for SSH remotes for backups.
"""

import datetime
import os
import pwd
import shutil
import subprocess
import tempfile

import pytest
from django.forms import ValidationError
from django.urls import reverse

from plinth.modules.backups import network_storage
from plinth.utils import generate_password, random_string

from .. import forms, views

pytestmark = [
    pytest.mark.usefixtures('needs_root', 'load_cfg', 'has_ssh_key'),
    pytest.mark.django_db
]


@pytest.fixture(name='temp_home', scope='module')
def fixture_temp_home_directory(needs_root):
    """Create a new temporary directory to act as a home directory.
    """
    # TODO Try to get this working with tempfile.TemporaryDirectory()
    dir_name = os.path.join('/tmp', random_string())
    yield dir_name
    os.path.exists(dir_name) and subprocess.check_call(['rm', '-rf', dir_name])


@pytest.fixture(name='password', scope='module')
def fixture_password():
    return generate_password()


def get_hashed_password(password):
    res = subprocess.run(['mkpasswd', '--method=md5', password],
                         stdout=subprocess.PIPE)
    return res.stdout.decode().strip()


@pytest.fixture(name='temp_user', scope='module')
def fixture_create_temp_user(temp_home, password, needs_root):
    """Create a temporary user.
    """
    username = random_string()
    hashed_password = get_hashed_password(password)
    # User account expires tomorrow
    tomorrow = datetime.date.today() + datetime.timedelta(days=1)
    subprocess.check_call([
        'useradd', '-d', temp_home, '-m', '-e',
        tomorrow.strftime('%Y-%m-%d'), '-p', hashed_password, username
    ])
    yield username
    subprocess.check_call(['sudo', 'pkill', '-u', username])
    subprocess.check_call(['sudo', 'userdel', username])


@pytest.mark.usefixtures('needs_sudo')
@pytest.fixture(name='has_ssh_key', scope='module', autouse=True)
def fixture_ssh_key(temp_home, temp_user, password, needs_root):
    subprocess.check_call([
        'sudo', '-n', '-u', temp_user, 'ssh-keygen', '-t', 'rsa', '-b', '1024',
        '-N', '', '-f', f'{temp_home}/.ssh/id_rsa', '-q'
    ])


@pytest.mark.skip
def test_user_setup(temp_home, temp_user):
    assert os.path.isdir(temp_home)
    assert pwd.getpwnam(temp_user)


@pytest.mark.skip
def test_add_repository_when_directory_is_missing(temp_user, temp_home,
                                                  password):
    repo_path = os.path.join(temp_home, 'non_existent_dir')
    data = {
        'repository': f'{temp_user}@localhost:{repo_path}',
        'ssh_password': password,
        'encryption': 'none'
    }
    # TODO test the view instead of the form
    form = forms.AddRepositoryForm(data=data)
    form.is_valid()
    assert os.path.isdir(repo_path)  # Directory gets created


@pytest.mark.skip
def test_add_repository_when_directory_exists_and_empty(
        temp_user, temp_home, password):
    repo_path = os.path.join(temp_home, 'empty_dir')
    os.makedirs(repo_path)
    data = {
        'repository': f'{temp_user}@localhost:{repo_path}',
        'ssh_password': password,
        'encryption': 'none'
    }
    # TODO test the view instead of the form
    form = forms.AddRepositoryForm(data=data)
    form.is_valid()


# TODO Fails only in unit test but not if manually tested!
@pytest.mark.skip
def test_add_repository_when_directory_exists_and_not_empty(
        temp_user, temp_home, password):
    repo_path = os.path.join(temp_home, 'non_empty_dir')
    os.makedirs(repo_path)
    open(os.path.join(repo_path, 'somefile.txt'), 'w').close()
    data = {
        'repository': f'{temp_user}@localhost:{repo_path}',
        'ssh_password': password,
        'encryption': 'none'
    }
    form = forms.AddRepositoryForm(data=data)
    with pytest.raises(ValidationError):
        form.is_valid()