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import os

import fixtures
import mock

from pbr import packaging
from pbr.tests import base


class TestRepo(fixtures.Fixture):
    """A git repo for testing with.

    Use of TempHomeDir with this fixture is strongly recommended as due to the
    lack of config --local in older gits, it will write to the users global
    configuration without TempHomeDir.
    """

    def __init__(self, basedir):
        super(TestRepo, self).__init__()
        self._basedir = basedir

    def setUp(self):
        super(TestRepo, self).setUp()
        base._run_cmd(['git', 'init', '.'], self._basedir)
        base._run_cmd(
            ['git', 'config', '--global', 'user.email', 'example@example.com'],
            self._basedir)
        base._run_cmd(['git', 'add', '.'], self._basedir)

    def commit(self):
        base._run_cmd(['git', 'commit', '-m', 'test commit'], self._basedir)


class TestPackagingInGitRepoWithCommit(base.BaseTestCase):

    def setUp(self):
        super(TestPackagingInGitRepoWithCommit, self).setUp()
        repo = self.useFixture(TestRepo(self.package_dir))
        repo.commit()
        self.run_setup('sdist')
        return

    def test_authors(self):
        # One commit, something should be in the authors list
        with open(os.path.join(self.package_dir, 'AUTHORS'), 'r') as f:
            body = f.read()
        self.assertNotEqual(body, '')

    def test_changelog(self):
        with open(os.path.join(self.package_dir, 'ChangeLog'), 'r') as f:
            body = f.read()
        # One commit, something should be in the ChangeLog list
        self.assertNotEqual(body, '')


class TestPackagingInGitRepoWithoutCommit(base.BaseTestCase):

    def setUp(self):
        super(TestPackagingInGitRepoWithoutCommit, self).setUp()
        self.useFixture(TestRepo(self.package_dir))
        self.run_setup('sdist')
        return

    def test_authors(self):
        # No commits, no authors in list
        with open(os.path.join(self.package_dir, 'AUTHORS'), 'r') as f:
            body = f.read()
        self.assertEqual(body, '\n')

    def test_changelog(self):
        # No commits, nothing should be in the ChangeLog list
        with open(os.path.join(self.package_dir, 'ChangeLog'), 'r') as f:
            body = f.read()
        self.assertEqual(body, 'CHANGES\n=======\n\n')


class TestPackagingInPlainDirectory(base.BaseTestCase):

    def setUp(self):
        super(TestPackagingInPlainDirectory, self).setUp()
        self.run_setup('sdist')
        return

    def test_authors(self):
        # Not a git repo, no AUTHORS file created
        filename = os.path.join(self.package_dir, 'AUTHORS')
        self.assertFalse(os.path.exists(filename))

    def test_changelog(self):
        # Not a git repo, no ChangeLog created
        filename = os.path.join(self.package_dir, 'ChangeLog')
        self.assertFalse(os.path.exists(filename))


class TestPresenceOfGit(base.BaseTestCase):

    def testGitIsInstalled(self):
        with mock.patch.object(packaging,
                               '_run_shell_command') as _command:
            _command.return_value = 'git version 1.8.4.1'
            self.assertEqual(True, packaging._git_is_installed())

    def testGitIsNotInstalled(self):
        with mock.patch.object(packaging,
                               '_run_shell_command') as _command:
            _command.side_effect = OSError
            self.assertEqual(False, packaging._git_is_installed())