# Copyright (c) 2020 Red Hat, Inc.
#
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.
from __future__ import absolute_import

from oslo_log import log
import testtools

import tobiko
from tobiko.shell import sh


LOG = log.getLogger(__name__)


class RebootHostTest(testtools.TestCase):

    def test_list_processes(self):
        processes = sh.list_processes()
        self._check_processes(processes,
                              is_kernel=False)

    def test_list_kernel_processes(self):
        processes = sh.list_kernel_processes()
        self._check_processes(processes=processes, is_kernel=True)

    def test_list_all_processes(self):
        processes = sh.list_all_processes()
        self._check_processes(processes=processes, is_kernel=None)

    def test_list_processes_with_pid(self):
        processes = sh.list_processes()
        processes_with_pid = sh.list_processes(pid=processes[0].pid)
        self.assertEqual(processes[:1], processes_with_pid)

    def test_list_processes_with_command(self):
        processes = sh.list_processes(command='systemd')
        for process in processes:
            self.assertTrue(process.command.startswith('systemd'), process)

    def test_list_processes_with_exact_command(self):
        processes = sh.list_processes(command='^systemd$')
        self.assertEqual(processes.with_attributes(command='systemd'),
                         processes)

    def _check_processes(self, processes, is_kernel):
        self.assertIsInstance(processes, tobiko.Selection)
        for process in processes:
            self.assertGreater(process.pid, 0)
            self.assertIs(
                (process.command.startswith('[') and
                 process.command.endswith(']')),
                process.is_kernel)
            if is_kernel is not None:
                self.assertIs(bool(is_kernel), process.is_kernel)

    def test_wait_for_processes(self):
        # assume the PID of the first execution of PS process is not more there
        # at the second execution
        process = sh.list_processes(command='ps')[-1]
        sh.wait_for_processes(pid=process.pid, command='ps', timeout=30.)

    def test_wait_for_processes_timeout(self):
        # assume there are always to be running processes on host
        ex = self.assertRaises(sh.PsWaitTimeout, sh.wait_for_processes,
                               timeout=3.)
        self.assertEqual(3., ex.timeout)
        self.assertEqual(sh.get_hostname(), ex.hostname)