# Copyright 2013 IBM Corp.
#
#    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.

import os
import shutil
import StringIO
import subprocess
import tempfile

from tempest.tests import base

DEVNULL = open(os.devnull, 'wb')


class TestWrappers(base.TestCase):
    def setUp(self):
        super(TestWrappers, self).setUp()
        # Setup test dirs
        self.directory = tempfile.mkdtemp(prefix='tempest-unit')
        self.addCleanup(shutil.rmtree, self.directory)
        self.test_dir = os.path.join(self.directory, 'tests')
        os.mkdir(self.test_dir)
        # Setup Test files
        self.testr_conf_file = os.path.join(self.directory, '.testr.conf')
        self.setup_cfg_file = os.path.join(self.directory, 'setup.cfg')
        self.subunit_trace = os.path.join(self.directory, 'subunit-trace.py')
        self.passing_file = os.path.join(self.test_dir, 'test_passing.py')
        self.failing_file = os.path.join(self.test_dir, 'test_failing.py')
        self.init_file = os.path.join(self.test_dir, '__init__.py')
        self.setup_py = os.path.join(self.directory, 'setup.py')
        shutil.copy('tempest/tests/files/testr-conf', self.testr_conf_file)
        shutil.copy('tempest/tests/files/passing-tests', self.passing_file)
        shutil.copy('tempest/tests/files/failing-tests', self.failing_file)
        shutil.copy('setup.py', self.setup_py)
        shutil.copy('tempest/tests/files/setup.cfg', self.setup_cfg_file)
        shutil.copy('tempest/tests/files/__init__.py', self.init_file)
        shutil.copy('tools/subunit-trace.py', self.subunit_trace)
        # copy over the pretty_tox scripts
        shutil.copy('tools/pretty_tox.sh',
                    os.path.join(self.directory, 'pretty_tox.sh'))
        shutil.copy('tools/pretty_tox_serial.sh',
                    os.path.join(self.directory, 'pretty_tox_serial.sh'))

        self.stdout = StringIO.StringIO()
        self.stderr = StringIO.StringIO()
        # Change directory, run wrapper and check result
        self.addCleanup(os.chdir, os.path.abspath(os.curdir))
        os.chdir(self.directory)

    def assertRunExit(self, cmd, expected):
        p = subprocess.Popen(
            "bash %s" % cmd, shell=True,
            stdout=subprocess.PIPE, stderr=subprocess.PIPE)
        # wait in the general case is dangerous, however the amount of
        # data coming back on those pipes is small enough it shouldn't be
        # a problem.
        p.wait()

        self.assertEqual(
            p.returncode, expected,
            "Stdout: %s; Stderr: %s" % (p.stdout, p.stderr))

    def test_pretty_tox(self):
        # Git init is required for the pbr testr command. pbr requires a git
        # version or an sdist to work. so make the test directory a git repo
        # too.
        subprocess.call(['git', 'init'], stderr=DEVNULL)
        self.assertRunExit('pretty_tox.sh tests.passing', 0)

    def test_pretty_tox_fails(self):
        # Git init is required for the pbr testr command. pbr requires a git
        # version or an sdist to work. so make the test directory a git repo
        # too.
        subprocess.call(['git', 'init'], stderr=DEVNULL)
        self.assertRunExit('pretty_tox.sh', 1)

    def test_pretty_tox_serial(self):
        self.assertRunExit('pretty_tox_serial.sh tests.passing', 0)

    def test_pretty_tox_serial_fails(self):
        self.assertRunExit('pretty_tox_serial.sh', 1)
