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# Copyright (c) 2013 Hewlett-Packard Development Company, L.P.
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"""Common utilities used in testing"""

import os
import shutil
import subprocess
import sys

import fixtures
import testresources
import testtools

from pbr import packaging


class DiveDir(fixtures.Fixture):
    """Dive into given directory and return back on cleanup.

    :ivar path: The target directory.
    """

    def __init__(self, path):
        self.path = path

    def setUp(self):
        super(DiveDir, self).setUp()
        self.addCleanup(os.chdir, os.getcwd())
        os.chdir(self.path)


class BaseTestCase(testtools.TestCase, testresources.ResourcedTestCase):

    def setUp(self):
        super(BaseTestCase, self).setUp()
        test_timeout = os.environ.get('OS_TEST_TIMEOUT', 30)
        try:
            test_timeout = int(test_timeout)
        except ValueError:
            # If timeout value is invalid, fail hard.
            print("OS_TEST_TIMEOUT set to invalid value"
                  " defaulting to no timeout")
            test_timeout = 0
        if test_timeout > 0:
            self.useFixture(fixtures.Timeout(test_timeout, gentle=True))

        if os.environ.get('OS_STDOUT_CAPTURE') in packaging.TRUE_VALUES:
            stdout = self.useFixture(fixtures.StringStream('stdout')).stream
            self.useFixture(fixtures.MonkeyPatch('sys.stdout', stdout))
        if os.environ.get('OS_STDERR_CAPTURE') in packaging.TRUE_VALUES:
            stderr = self.useFixture(fixtures.StringStream('stderr')).stream
            self.useFixture(fixtures.MonkeyPatch('sys.stderr', stderr))
        self.log_fixture = self.useFixture(
            fixtures.FakeLogger('pbr'))

        self.useFixture(fixtures.NestedTempfile())
        self.useFixture(fixtures.FakeLogger())
        self.useFixture(fixtures.EnvironmentVariable('PBR_VERSION', '0.0'))

        self.temp_dir = self.useFixture(fixtures.TempDir()).path
        self.package_dir = os.path.join(self.temp_dir, 'testpackage')
        shutil.copytree(os.path.join(os.path.dirname(__file__), 'testpackage'),
                        self.package_dir)
        self.addCleanup(os.chdir, os.getcwd())
        os.chdir(self.package_dir)
        self.addCleanup(self._discard_testpackage)

    def _discard_testpackage(self):
        # Remove pbr.testpackage from sys.modules so that it can be freshly
        # re-imported by the next test
        for k in list(sys.modules):
            if (k == 'pbr_testpackage' or
                    k.startswith('pbr_testpackage.')):
                del sys.modules[k]

    def run_setup(self, *args):
        return self._run_cmd(sys.executable, ('setup.py',) + args)

    def _run_cmd(self, cmd, args=[]):
        """Run a command in the root of the test working copy.

        Runs a command, with the given argument list, in the root of the test
        working copy--returns the stdout and stderr streams and the exit code
        from the subprocess.
        """

        os.chdir(self.package_dir)
        p = subprocess.Popen([cmd] + list(args), stdout=subprocess.PIPE,
                             stderr=subprocess.PIPE)

        streams = tuple(s.decode('latin1').strip() for s in p.communicate())
        for line in streams:
            print(line)
        return (streams) + (p.returncode,)
