# Copyright (C) 2015 The Android Open Source Project
#
# 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.

"""Unittests for the wrapper.py module."""

import contextlib
from io import StringIO
import os
import re
import shutil
import tempfile
import unittest
from unittest import mock

import git_command
import main
import platform_utils
import wrapper


@contextlib.contextmanager
def TemporaryDirectory():
  """Create a new empty git checkout for testing."""
  # TODO(vapier): Convert this to tempfile.TemporaryDirectory once we drop
  # Python 2 support entirely.
  try:
    tempdir = tempfile.mkdtemp(prefix='repo-tests')
    yield tempdir
  finally:
    platform_utils.rmtree(tempdir)


def fixture(*paths):
  """Return a path relative to tests/fixtures.
  """
  return os.path.join(os.path.dirname(__file__), 'fixtures', *paths)


class RepoWrapperTestCase(unittest.TestCase):
  """TestCase for the wrapper module."""

  def setUp(self):
    """Load the wrapper module every time."""
    wrapper._wrapper_module = None
    self.wrapper = wrapper.Wrapper()


class RepoWrapperUnitTest(RepoWrapperTestCase):
  """Tests helper functions in the repo wrapper
  """

  def test_version(self):
    """Make sure _Version works."""
    with self.assertRaises(SystemExit) as e:
      with mock.patch('sys.stdout', new_callable=StringIO) as stdout:
        with mock.patch('sys.stderr', new_callable=StringIO) as stderr:
          self.wrapper._Version()
    self.assertEqual(0, e.exception.code)
    self.assertEqual('', stderr.getvalue())
    self.assertIn('repo launcher version', stdout.getvalue())

  def test_python_constraints(self):
    """The launcher should never require newer than main.py."""
    self.assertGreaterEqual(main.MIN_PYTHON_VERSION_HARD,
                            wrapper.MIN_PYTHON_VERSION_HARD)
    self.assertGreaterEqual(main.MIN_PYTHON_VERSION_SOFT,
                            wrapper.MIN_PYTHON_VERSION_SOFT)
    # Make sure the versions are themselves in sync.
    self.assertGreaterEqual(wrapper.MIN_PYTHON_VERSION_SOFT,
                            wrapper.MIN_PYTHON_VERSION_HARD)

  def test_init_parser(self):
    """Make sure 'init' GetParser works."""
    parser = self.wrapper.GetParser(gitc_init=False)
    opts, args = parser.parse_args([])
    self.assertEqual([], args)
    self.assertIsNone(opts.manifest_url)

  def test_gitc_init_parser(self):
    """Make sure 'gitc-init' GetParser works."""
    parser = self.wrapper.GetParser(gitc_init=True)
    opts, args = parser.parse_args([])
    self.assertEqual([], args)
    self.assertIsNone(opts.manifest_file)

  def test_get_gitc_manifest_dir_no_gitc(self):
    """
    Test reading a missing gitc config file
    """
    self.wrapper.GITC_CONFIG_FILE = fixture('missing_gitc_config')
    val = self.wrapper.get_gitc_manifest_dir()
    self.assertEqual(val, '')

  def test_get_gitc_manifest_dir(self):
    """
    Test reading the gitc config file and parsing the directory
    """
    self.wrapper.GITC_CONFIG_FILE = fixture('gitc_config')
    val = self.wrapper.get_gitc_manifest_dir()
    self.assertEqual(val, '/test/usr/local/google/gitc')

  def test_gitc_parse_clientdir_no_gitc(self):
    """
    Test parsing the gitc clientdir without gitc running
    """
    self.wrapper.GITC_CONFIG_FILE = fixture('missing_gitc_config')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/something'), None)
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/gitc/manifest-rw/test'), 'test')

  def test_gitc_parse_clientdir(self):
    """
    Test parsing the gitc clientdir
    """
    self.wrapper.GITC_CONFIG_FILE = fixture('gitc_config')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/something'), None)
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/gitc/manifest-rw/test'), 'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/gitc/manifest-rw/test/'), 'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/gitc/manifest-rw/test/extra'), 'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/test/usr/local/google/gitc/test'), 'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/test/usr/local/google/gitc/test/'), 'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/test/usr/local/google/gitc/test/extra'),
                     'test')
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/gitc/manifest-rw/'), None)
    self.assertEqual(self.wrapper.gitc_parse_clientdir('/test/usr/local/google/gitc/'), None)


class SetGitTrace2ParentSid(RepoWrapperTestCase):
  """Check SetGitTrace2ParentSid behavior."""

  KEY = 'GIT_TRACE2_PARENT_SID'
  VALID_FORMAT = re.compile(r'^repo-[0-9]{8}T[0-9]{6}Z-P[0-9a-f]{8}$')

  def test_first_set(self):
    """Test env var not yet set."""
    env = {}
    self.wrapper.SetGitTrace2ParentSid(env)
    self.assertIn(self.KEY, env)
    value = env[self.KEY]
    self.assertRegex(value, self.VALID_FORMAT)

  def test_append(self):
    """Test env var is appended."""
    env = {self.KEY: 'pfx'}
    self.wrapper.SetGitTrace2ParentSid(env)
    self.assertIn(self.KEY, env)
    value = env[self.KEY]
    self.assertTrue(value.startswith('pfx/'))
    self.assertRegex(value[4:], self.VALID_FORMAT)

  def test_global_context(self):
    """Check os.environ gets updated by default."""
    os.environ.pop(self.KEY, None)
    self.wrapper.SetGitTrace2ParentSid()
    self.assertIn(self.KEY, os.environ)
    value = os.environ[self.KEY]
    self.assertRegex(value, self.VALID_FORMAT)


class RunCommand(RepoWrapperTestCase):
  """Check run_command behavior."""

  def test_capture(self):
    """Check capture_output handling."""
    ret = self.wrapper.run_command(['echo', 'hi'], capture_output=True)
    self.assertEqual(ret.stdout, 'hi\n')

  def test_check(self):
    """Check check handling."""
    self.wrapper.run_command(['true'], check=False)
    self.wrapper.run_command(['true'], check=True)
    self.wrapper.run_command(['false'], check=False)
    with self.assertRaises(self.wrapper.RunError):
      self.wrapper.run_command(['false'], check=True)


class RunGit(RepoWrapperTestCase):
  """Check run_git behavior."""

  def test_capture(self):
    """Check capture_output handling."""
    ret = self.wrapper.run_git('--version')
    self.assertIn('git', ret.stdout)

  def test_check(self):
    """Check check handling."""
    with self.assertRaises(self.wrapper.CloneFailure):
      self.wrapper.run_git('--version-asdfasdf')
    self.wrapper.run_git('--version-asdfasdf', check=False)


class ParseGitVersion(RepoWrapperTestCase):
  """Check ParseGitVersion behavior."""

  def test_autoload(self):
    """Check we can load the version from the live git."""
    ret = self.wrapper.ParseGitVersion()
    self.assertIsNotNone(ret)

  def test_bad_ver(self):
    """Check handling of bad git versions."""
    ret = self.wrapper.ParseGitVersion(ver_str='asdf')
    self.assertIsNone(ret)

  def test_normal_ver(self):
    """Check handling of normal git versions."""
    ret = self.wrapper.ParseGitVersion(ver_str='git version 2.25.1')
    self.assertEqual(2, ret.major)
    self.assertEqual(25, ret.minor)
    self.assertEqual(1, ret.micro)
    self.assertEqual('2.25.1', ret.full)

  def test_extended_ver(self):
    """Check handling of extended distro git versions."""
    ret = self.wrapper.ParseGitVersion(
        ver_str='git version 1.30.50.696.g5e7596f4ac-goog')
    self.assertEqual(1, ret.major)
    self.assertEqual(30, ret.minor)
    self.assertEqual(50, ret.micro)
    self.assertEqual('1.30.50.696.g5e7596f4ac-goog', ret.full)


class CheckGitVersion(RepoWrapperTestCase):
  """Check _CheckGitVersion behavior."""

  def test_unknown(self):
    """Unknown versions should abort."""
    with mock.patch.object(self.wrapper, 'ParseGitVersion', return_value=None):
      with self.assertRaises(self.wrapper.CloneFailure):
        self.wrapper._CheckGitVersion()

  def test_old(self):
    """Old versions should abort."""
    with mock.patch.object(
        self.wrapper, 'ParseGitVersion',
        return_value=self.wrapper.GitVersion(1, 0, 0, '1.0.0')):
      with self.assertRaises(self.wrapper.CloneFailure):
        self.wrapper._CheckGitVersion()

  def test_new(self):
    """Newer versions should run fine."""
    with mock.patch.object(
        self.wrapper, 'ParseGitVersion',
        return_value=self.wrapper.GitVersion(100, 0, 0, '100.0.0')):
      self.wrapper._CheckGitVersion()


class NeedSetupGnuPG(RepoWrapperTestCase):
  """Check NeedSetupGnuPG behavior."""

  def test_missing_dir(self):
    """The ~/.repoconfig tree doesn't exist yet."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = os.path.join(tempdir, 'foo')
      self.assertTrue(self.wrapper.NeedSetupGnuPG())

  def test_missing_keyring(self):
    """The keyring-version file doesn't exist yet."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = tempdir
      self.assertTrue(self.wrapper.NeedSetupGnuPG())

  def test_empty_keyring(self):
    """The keyring-version file exists, but is empty."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = tempdir
      with open(os.path.join(tempdir, 'keyring-version'), 'w'):
        pass
      self.assertTrue(self.wrapper.NeedSetupGnuPG())

  def test_old_keyring(self):
    """The keyring-version file exists, but it's old."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = tempdir
      with open(os.path.join(tempdir, 'keyring-version'), 'w') as fp:
        fp.write('1.0\n')
      self.assertTrue(self.wrapper.NeedSetupGnuPG())

  def test_new_keyring(self):
    """The keyring-version file exists, and is up-to-date."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = tempdir
      with open(os.path.join(tempdir, 'keyring-version'), 'w') as fp:
        fp.write('1000.0\n')
      self.assertFalse(self.wrapper.NeedSetupGnuPG())


class SetupGnuPG(RepoWrapperTestCase):
  """Check SetupGnuPG behavior."""

  def test_full(self):
    """Make sure it works completely."""
    with TemporaryDirectory() as tempdir:
      self.wrapper.home_dot_repo = tempdir
      self.wrapper.gpg_dir = os.path.join(self.wrapper.home_dot_repo, 'gnupg')
      self.assertTrue(self.wrapper.SetupGnuPG(True))
      with open(os.path.join(tempdir, 'keyring-version'), 'r') as fp:
        data = fp.read()
      self.assertEqual('.'.join(str(x) for x in self.wrapper.KEYRING_VERSION),
                       data.strip())


class VerifyRev(RepoWrapperTestCase):
  """Check verify_rev behavior."""

  def test_verify_passes(self):
    """Check when we have a valid signed tag."""
    desc_result = self.wrapper.RunResult(0, 'v1.0\n', '')
    gpg_result = self.wrapper.RunResult(0, '', '')
    with mock.patch.object(self.wrapper, 'run_git',
                           side_effect=(desc_result, gpg_result)):
      ret = self.wrapper.verify_rev('/', 'refs/heads/stable', '1234', True)
      self.assertEqual('v1.0^0', ret)

  def test_unsigned_commit(self):
    """Check we fall back to signed tag when we have an unsigned commit."""
    desc_result = self.wrapper.RunResult(0, 'v1.0-10-g1234\n', '')
    gpg_result = self.wrapper.RunResult(0, '', '')
    with mock.patch.object(self.wrapper, 'run_git',
                           side_effect=(desc_result, gpg_result)):
      ret = self.wrapper.verify_rev('/', 'refs/heads/stable', '1234', True)
      self.assertEqual('v1.0^0', ret)

  def test_verify_fails(self):
    """Check we fall back to signed tag when we have an unsigned commit."""
    desc_result = self.wrapper.RunResult(0, 'v1.0-10-g1234\n', '')
    gpg_result = Exception
    with mock.patch.object(self.wrapper, 'run_git',
                           side_effect=(desc_result, gpg_result)):
      with self.assertRaises(Exception):
        self.wrapper.verify_rev('/', 'refs/heads/stable', '1234', True)


class GitCheckoutTestCase(RepoWrapperTestCase):
  """Tests that use a real/small git checkout."""

  GIT_DIR = None
  REV_LIST = None

  @classmethod
  def setUpClass(cls):
    # Create a repo to operate on, but do it once per-class.
    cls.GIT_DIR = tempfile.mkdtemp(prefix='repo-rev-tests')
    run_git = wrapper.Wrapper().run_git

    remote = os.path.join(cls.GIT_DIR, 'remote')
    os.mkdir(remote)

    # Tests need to assume, that main is default branch at init,
    # which is not supported in config until 2.28.
    if git_command.git_require((2, 28, 0)):
      initstr = '--initial-branch=main'
    else:
      # Use template dir for init.
      templatedir = tempfile.mkdtemp(prefix='.test-template')
      with open(os.path.join(templatedir, 'HEAD'), 'w') as fp:
        fp.write('ref: refs/heads/main\n')
      initstr = '--template=' + templatedir

    run_git('init', initstr, cwd=remote)
    run_git('commit', '--allow-empty', '-minit', cwd=remote)
    run_git('branch', 'stable', cwd=remote)
    run_git('tag', 'v1.0', cwd=remote)
    run_git('commit', '--allow-empty', '-m2nd commit', cwd=remote)
    cls.REV_LIST = run_git('rev-list', 'HEAD', cwd=remote).stdout.splitlines()

    run_git('init', cwd=cls.GIT_DIR)
    run_git('fetch', remote, '+refs/heads/*:refs/remotes/origin/*', cwd=cls.GIT_DIR)

  @classmethod
  def tearDownClass(cls):
    if not cls.GIT_DIR:
      return

    shutil.rmtree(cls.GIT_DIR)


class ResolveRepoRev(GitCheckoutTestCase):
  """Check resolve_repo_rev behavior."""

  def test_explicit_branch(self):
    """Check refs/heads/branch argument."""
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, 'refs/heads/stable')
    self.assertEqual('refs/heads/stable', rrev)
    self.assertEqual(self.REV_LIST[1], lrev)

    with self.assertRaises(wrapper.CloneFailure):
      self.wrapper.resolve_repo_rev(self.GIT_DIR, 'refs/heads/unknown')

  def test_explicit_tag(self):
    """Check refs/tags/tag argument."""
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, 'refs/tags/v1.0')
    self.assertEqual('refs/tags/v1.0', rrev)
    self.assertEqual(self.REV_LIST[1], lrev)

    with self.assertRaises(wrapper.CloneFailure):
      self.wrapper.resolve_repo_rev(self.GIT_DIR, 'refs/tags/unknown')

  def test_branch_name(self):
    """Check branch argument."""
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, 'stable')
    self.assertEqual('refs/heads/stable', rrev)
    self.assertEqual(self.REV_LIST[1], lrev)

    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, 'main')
    self.assertEqual('refs/heads/main', rrev)
    self.assertEqual(self.REV_LIST[0], lrev)

  def test_tag_name(self):
    """Check tag argument."""
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, 'v1.0')
    self.assertEqual('refs/tags/v1.0', rrev)
    self.assertEqual(self.REV_LIST[1], lrev)

  def test_full_commit(self):
    """Check specific commit argument."""
    commit = self.REV_LIST[0]
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, commit)
    self.assertEqual(commit, rrev)
    self.assertEqual(commit, lrev)

  def test_partial_commit(self):
    """Check specific (partial) commit argument."""
    commit = self.REV_LIST[0][0:20]
    rrev, lrev = self.wrapper.resolve_repo_rev(self.GIT_DIR, commit)
    self.assertEqual(self.REV_LIST[0], rrev)
    self.assertEqual(self.REV_LIST[0], lrev)

  def test_unknown(self):
    """Check unknown ref/commit argument."""
    with self.assertRaises(wrapper.CloneFailure):
      self.wrapper.resolve_repo_rev(self.GIT_DIR, 'boooooooya')


class CheckRepoVerify(RepoWrapperTestCase):
  """Check check_repo_verify behavior."""

  def test_no_verify(self):
    """Always fail with --no-repo-verify."""
    self.assertFalse(self.wrapper.check_repo_verify(False))

  def test_gpg_initialized(self):
    """Should pass if gpg is setup already."""
    with mock.patch.object(self.wrapper, 'NeedSetupGnuPG', return_value=False):
      self.assertTrue(self.wrapper.check_repo_verify(True))

  def test_need_gpg_setup(self):
    """Should pass/fail based on gpg setup."""
    with mock.patch.object(self.wrapper, 'NeedSetupGnuPG', return_value=True):
      with mock.patch.object(self.wrapper, 'SetupGnuPG') as m:
        m.return_value = True
        self.assertTrue(self.wrapper.check_repo_verify(True))

        m.return_value = False
        self.assertFalse(self.wrapper.check_repo_verify(True))


class CheckRepoRev(GitCheckoutTestCase):
  """Check check_repo_rev behavior."""

  def test_verify_works(self):
    """Should pass when verification passes."""
    with mock.patch.object(self.wrapper, 'check_repo_verify', return_value=True):
      with mock.patch.object(self.wrapper, 'verify_rev', return_value='12345'):
        rrev, lrev = self.wrapper.check_repo_rev(self.GIT_DIR, 'stable')
    self.assertEqual('refs/heads/stable', rrev)
    self.assertEqual('12345', lrev)

  def test_verify_fails(self):
    """Should fail when verification fails."""
    with mock.patch.object(self.wrapper, 'check_repo_verify', return_value=True):
      with mock.patch.object(self.wrapper, 'verify_rev', side_effect=Exception):
        with self.assertRaises(Exception):
          self.wrapper.check_repo_rev(self.GIT_DIR, 'stable')

  def test_verify_ignore(self):
    """Should pass when verification is disabled."""
    with mock.patch.object(self.wrapper, 'verify_rev', side_effect=Exception):
      rrev, lrev = self.wrapper.check_repo_rev(self.GIT_DIR, 'stable', repo_verify=False)
    self.assertEqual('refs/heads/stable', rrev)
    self.assertEqual(self.REV_LIST[1], lrev)


if __name__ == '__main__':
  unittest.main()