# 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 io
import os
import re
import subprocess
import sys
import tempfile
import unittest
from unittest import mock

import git_command
import main
import wrapper


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.cache_clear()
        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=io.StringIO) as stdout:
                with mock.patch(
                    "sys.stderr", new_callable=io.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, self.wrapper.MIN_PYTHON_VERSION_HARD
        )
        self.assertGreaterEqual(
            main.MIN_PYTHON_VERSION_SOFT, self.wrapper.MIN_PYTHON_VERSION_SOFT
        )
        # Make sure the versions are themselves in sync.
        self.assertGreaterEqual(
            self.wrapper.MIN_PYTHON_VERSION_SOFT,
            self.wrapper.MIN_PYTHON_VERSION_HARD,
        )

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


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)
        # echo command appends OS specific linesep, but on Windows + Git Bash
        # we get UNIX ending, so we allow both.
        self.assertIn(ret.stdout, ["hi" + os.linesep, "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(subprocess.CalledProcessError):
            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 Requirements(RepoWrapperTestCase):
    """Check Requirements handling."""

    def test_missing_file(self):
        """Don't crash if the file is missing (old version)."""
        testdir = os.path.dirname(os.path.realpath(__file__))
        self.assertIsNone(self.wrapper.Requirements.from_dir(testdir))
        self.assertIsNone(
            self.wrapper.Requirements.from_file(
                os.path.join(testdir, "xxxxxxxxxxxxxxxxxxxxxxxx")
            )
        )

    def test_corrupt_data(self):
        """If the file can't be parsed, don't blow up."""
        self.assertIsNone(self.wrapper.Requirements.from_file(__file__))
        self.assertIsNone(self.wrapper.Requirements.from_data(b"x"))

    def test_valid_data(self):
        """Make sure we can parse the file we ship."""
        self.assertIsNotNone(self.wrapper.Requirements.from_data(b"{}"))
        rootdir = os.path.dirname(os.path.dirname(os.path.realpath(__file__)))
        self.assertIsNotNone(self.wrapper.Requirements.from_dir(rootdir))
        self.assertIsNotNone(
            self.wrapper.Requirements.from_file(
                os.path.join(rootdir, "requirements.json")
            )
        )

    def test_format_ver(self):
        """Check format_ver can format."""
        self.assertEqual(
            "1.2.3", self.wrapper.Requirements._format_ver((1, 2, 3))
        )
        self.assertEqual("1", self.wrapper.Requirements._format_ver([1]))

    def test_assert_all_unknown(self):
        """Check assert_all works with incompatible file."""
        reqs = self.wrapper.Requirements({})
        reqs.assert_all()

    def test_assert_all_new_repo(self):
        """Check assert_all accepts new enough repo."""
        reqs = self.wrapper.Requirements({"repo": {"hard": [1, 0]}})
        reqs.assert_all()

    def test_assert_all_old_repo(self):
        """Check assert_all rejects old repo."""
        reqs = self.wrapper.Requirements({"repo": {"hard": [99999, 0]}})
        with self.assertRaises(SystemExit):
            reqs.assert_all()

    def test_assert_all_new_python(self):
        """Check assert_all accepts new enough python."""
        reqs = self.wrapper.Requirements({"python": {"hard": sys.version_info}})
        reqs.assert_all()

    def test_assert_all_old_python(self):
        """Check assert_all rejects old python."""
        reqs = self.wrapper.Requirements({"python": {"hard": [99999, 0]}})
        with self.assertRaises(SystemExit):
            reqs.assert_all()

    def test_assert_ver_unknown(self):
        """Check assert_ver works with incompatible file."""
        reqs = self.wrapper.Requirements({})
        reqs.assert_ver("xxx", (1, 0))

    def test_assert_ver_new(self):
        """Check assert_ver allows new enough versions."""
        reqs = self.wrapper.Requirements(
            {"git": {"hard": [1, 0], "soft": [2, 0]}}
        )
        reqs.assert_ver("git", (1, 0))
        reqs.assert_ver("git", (1, 5))
        reqs.assert_ver("git", (2, 0))
        reqs.assert_ver("git", (2, 5))

    def test_assert_ver_old(self):
        """Check assert_ver rejects old versions."""
        reqs = self.wrapper.Requirements(
            {"git": {"hard": [1, 0], "soft": [2, 0]}}
        )
        with self.assertRaises(SystemExit):
            reqs.assert_ver("git", (0, 5))


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

    def test_missing_dir(self):
        """The ~/.repoconfig tree doesn't exist yet."""
        with tempfile.TemporaryDirectory(prefix="repo-tests") 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 tempfile.TemporaryDirectory(prefix="repo-tests") 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 tempfile.TemporaryDirectory(prefix="repo-tests") 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 tempfile.TemporaryDirectory(prefix="repo-tests") 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 tempfile.TemporaryDirectory(prefix="repo-tests") 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 tempfile.TemporaryDirectory(prefix="repo-tests") 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")) 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 = subprocess.CompletedProcess([], 0, "v1.0\n", "")
        gpg_result = subprocess.CompletedProcess([], 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 = subprocess.CompletedProcess([], 0, "v1.0-10-g1234\n", "")
        gpg_result = subprocess.CompletedProcess([], 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 = subprocess.CompletedProcess([], 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.tempdirobj = tempfile.TemporaryDirectory(prefix="repo-rev-tests")
        cls.GIT_DIR = cls.tempdirobj.name
        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.tempdirobj:
            return

        cls.tempdirobj.cleanup()


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(self.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(self.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(self.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)