# Copyright (C) 2019 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 project.py module."""

import contextlib
import os
from pathlib import Path
import subprocess
import tempfile
import unittest

import error
import git_command
import git_config
import manifest_xml
import platform_utils
import project


@contextlib.contextmanager
def TempGitTree():
    """Create a new empty git checkout for testing."""
    with tempfile.TemporaryDirectory(prefix="repo-tests") as tempdir:
        # Tests need to assume, that main is default branch at init,
        # which is not supported in config until 2.28.
        cmd = ["git", "init"]
        if git_command.git_require((2, 28, 0)):
            cmd += ["--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")
            cmd += ["--template", templatedir]
        subprocess.check_call(cmd, cwd=tempdir)
        yield tempdir


class FakeProject:
    """A fake for Project for basic functionality."""

    def __init__(self, worktree):
        self.worktree = worktree
        self.gitdir = os.path.join(worktree, ".git")
        self.name = "fakeproject"
        self.work_git = project.Project._GitGetByExec(
            self, bare=False, gitdir=self.gitdir
        )
        self.bare_git = project.Project._GitGetByExec(
            self, bare=True, gitdir=self.gitdir
        )
        self.config = git_config.GitConfig.ForRepository(gitdir=self.gitdir)


class ReviewableBranchTests(unittest.TestCase):
    """Check ReviewableBranch behavior."""

    def test_smoke(self):
        """A quick run through everything."""
        with TempGitTree() as tempdir:
            fakeproj = FakeProject(tempdir)

            # Generate some commits.
            with open(os.path.join(tempdir, "readme"), "w") as fp:
                fp.write("txt")
            fakeproj.work_git.add("readme")
            fakeproj.work_git.commit("-mAdd file")
            fakeproj.work_git.checkout("-b", "work")
            fakeproj.work_git.rm("-f", "readme")
            fakeproj.work_git.commit("-mDel file")

            # Start off with the normal details.
            rb = project.ReviewableBranch(
                fakeproj, fakeproj.config.GetBranch("work"), "main"
            )
            self.assertEqual("work", rb.name)
            self.assertEqual(1, len(rb.commits))
            self.assertIn("Del file", rb.commits[0])
            d = rb.unabbrev_commits
            self.assertEqual(1, len(d))
            short, long = next(iter(d.items()))
            self.assertTrue(long.startswith(short))
            self.assertTrue(rb.base_exists)
            # Hard to assert anything useful about this.
            self.assertTrue(rb.date)

            # Now delete the tracking branch!
            fakeproj.work_git.branch("-D", "main")
            rb = project.ReviewableBranch(
                fakeproj, fakeproj.config.GetBranch("work"), "main"
            )
            self.assertEqual(0, len(rb.commits))
            self.assertFalse(rb.base_exists)
            # Hard to assert anything useful about this.
            self.assertTrue(rb.date)


class CopyLinkTestCase(unittest.TestCase):
    """TestCase for stub repo client checkouts.

    It'll have a layout like this:
      tempdir/          # self.tempdir
        checkout/       # self.topdir
          git-project/  # self.worktree

    Attributes:
      tempdir: A dedicated temporary directory.
      worktree: The top of the repo client checkout.
      topdir: The top of a project checkout.
    """

    def setUp(self):
        self.tempdirobj = tempfile.TemporaryDirectory(prefix="repo_tests")
        self.tempdir = self.tempdirobj.name
        self.topdir = os.path.join(self.tempdir, "checkout")
        self.worktree = os.path.join(self.topdir, "git-project")
        os.makedirs(self.topdir)
        os.makedirs(self.worktree)

    def tearDown(self):
        self.tempdirobj.cleanup()

    @staticmethod
    def touch(path):
        with open(path, "w"):
            pass

    def assertExists(self, path, msg=None):
        """Make sure |path| exists."""
        if os.path.exists(path):
            return

        if msg is None:
            msg = ["path is missing: %s" % path]
            while path != "/":
                path = os.path.dirname(path)
                if not path:
                    # If we're given something like "foo", abort once we get to
                    # "".
                    break
                result = os.path.exists(path)
                msg.append(f"\tos.path.exists({path}): {result}")
                if result:
                    msg.append("\tcontents: %r" % os.listdir(path))
                    break
            msg = "\n".join(msg)

        raise self.failureException(msg)


class CopyFile(CopyLinkTestCase):
    """Check _CopyFile handling."""

    def CopyFile(self, src, dest):
        return project._CopyFile(self.worktree, src, self.topdir, dest)

    def test_basic(self):
        """Basic test of copying a file from a project to the toplevel."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        cf = self.CopyFile("foo.txt", "foo")
        cf._Copy()
        self.assertExists(os.path.join(self.topdir, "foo"))

    def test_src_subdir(self):
        """Copy a file from a subdir of a project."""
        src = os.path.join(self.worktree, "bar", "foo.txt")
        os.makedirs(os.path.dirname(src))
        self.touch(src)
        cf = self.CopyFile("bar/foo.txt", "new.txt")
        cf._Copy()
        self.assertExists(os.path.join(self.topdir, "new.txt"))

    def test_dest_subdir(self):
        """Copy a file to a subdir of a checkout."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        cf = self.CopyFile("foo.txt", "sub/dir/new.txt")
        self.assertFalse(os.path.exists(os.path.join(self.topdir, "sub")))
        cf._Copy()
        self.assertExists(os.path.join(self.topdir, "sub", "dir", "new.txt"))

    def test_update(self):
        """Make sure changed files get copied again."""
        src = os.path.join(self.worktree, "foo.txt")
        dest = os.path.join(self.topdir, "bar")
        with open(src, "w") as f:
            f.write("1st")
        cf = self.CopyFile("foo.txt", "bar")
        cf._Copy()
        self.assertExists(dest)
        with open(dest) as f:
            self.assertEqual(f.read(), "1st")

        with open(src, "w") as f:
            f.write("2nd!")
        cf._Copy()
        with open(dest) as f:
            self.assertEqual(f.read(), "2nd!")

    def test_src_block_symlink(self):
        """Do not allow reading from a symlinked path."""
        src = os.path.join(self.worktree, "foo.txt")
        sym = os.path.join(self.worktree, "sym")
        self.touch(src)
        platform_utils.symlink("foo.txt", sym)
        self.assertExists(sym)
        cf = self.CopyFile("sym", "foo")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)

    def test_src_block_symlink_traversal(self):
        """Do not allow reading through a symlink dir."""
        realfile = os.path.join(self.tempdir, "file.txt")
        self.touch(realfile)
        src = os.path.join(self.worktree, "bar", "file.txt")
        platform_utils.symlink(self.tempdir, os.path.join(self.worktree, "bar"))
        self.assertExists(src)
        cf = self.CopyFile("bar/file.txt", "foo")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)

    def test_src_block_copy_from_dir(self):
        """Do not allow copying from a directory."""
        src = os.path.join(self.worktree, "dir")
        os.makedirs(src)
        cf = self.CopyFile("dir", "foo")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)

    def test_dest_block_symlink(self):
        """Do not allow writing to a symlink."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        platform_utils.symlink("dest", os.path.join(self.topdir, "sym"))
        cf = self.CopyFile("foo.txt", "sym")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)

    def test_dest_block_symlink_traversal(self):
        """Do not allow writing through a symlink dir."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        platform_utils.symlink(
            tempfile.gettempdir(), os.path.join(self.topdir, "sym")
        )
        cf = self.CopyFile("foo.txt", "sym/foo.txt")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)

    def test_src_block_copy_to_dir(self):
        """Do not allow copying to a directory."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        os.makedirs(os.path.join(self.topdir, "dir"))
        cf = self.CopyFile("foo.txt", "dir")
        self.assertRaises(error.ManifestInvalidPathError, cf._Copy)


class LinkFile(CopyLinkTestCase):
    """Check _LinkFile handling."""

    def LinkFile(self, src, dest):
        return project._LinkFile(self.worktree, src, self.topdir, dest)

    def test_basic(self):
        """Basic test of linking a file from a project into the toplevel."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        lf = self.LinkFile("foo.txt", "foo")
        lf._Link()
        dest = os.path.join(self.topdir, "foo")
        self.assertExists(dest)
        self.assertTrue(os.path.islink(dest))
        self.assertEqual(
            os.path.join("git-project", "foo.txt"), os.readlink(dest)
        )

    def test_src_subdir(self):
        """Link to a file in a subdir of a project."""
        src = os.path.join(self.worktree, "bar", "foo.txt")
        os.makedirs(os.path.dirname(src))
        self.touch(src)
        lf = self.LinkFile("bar/foo.txt", "foo")
        lf._Link()
        self.assertExists(os.path.join(self.topdir, "foo"))

    def test_src_self(self):
        """Link to the project itself."""
        dest = os.path.join(self.topdir, "foo", "bar")
        lf = self.LinkFile(".", "foo/bar")
        lf._Link()
        self.assertExists(dest)
        self.assertEqual(os.path.join("..", "git-project"), os.readlink(dest))

    def test_dest_subdir(self):
        """Link a file to a subdir of a checkout."""
        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        lf = self.LinkFile("foo.txt", "sub/dir/foo/bar")
        self.assertFalse(os.path.exists(os.path.join(self.topdir, "sub")))
        lf._Link()
        self.assertExists(os.path.join(self.topdir, "sub", "dir", "foo", "bar"))

    def test_src_block_relative(self):
        """Do not allow relative symlinks."""
        BAD_SOURCES = (
            "./",
            "..",
            "../",
            "foo/.",
            "foo/./bar",
            "foo/..",
            "foo/../foo",
        )
        for src in BAD_SOURCES:
            lf = self.LinkFile(src, "foo")
            self.assertRaises(error.ManifestInvalidPathError, lf._Link)

    def test_update(self):
        """Make sure changed targets get updated."""
        dest = os.path.join(self.topdir, "sym")

        src = os.path.join(self.worktree, "foo.txt")
        self.touch(src)
        lf = self.LinkFile("foo.txt", "sym")
        lf._Link()
        self.assertEqual(
            os.path.join("git-project", "foo.txt"), os.readlink(dest)
        )

        # Point the symlink somewhere else.
        os.unlink(dest)
        platform_utils.symlink(self.tempdir, dest)
        lf._Link()
        self.assertEqual(
            os.path.join("git-project", "foo.txt"), os.readlink(dest)
        )


class MigrateWorkTreeTests(unittest.TestCase):
    """Check _MigrateOldWorkTreeGitDir handling."""

    _SYMLINKS = {
        "config",
        "description",
        "hooks",
        "info",
        "logs",
        "objects",
        "packed-refs",
        "refs",
        "rr-cache",
        "shallow",
        "svn",
    }
    _FILES = {
        "COMMIT_EDITMSG",
        "FETCH_HEAD",
        "HEAD",
        "index",
        "ORIG_HEAD",
        "unknown-file-should-be-migrated",
    }
    _CLEAN_FILES = {
        "a-vim-temp-file~",
        "#an-emacs-temp-file#",
    }

    @classmethod
    @contextlib.contextmanager
    def _simple_layout(cls):
        """Create a simple repo client checkout to test against."""
        with tempfile.TemporaryDirectory() as tempdir:
            tempdir = Path(tempdir)

            gitdir = tempdir / ".repo/projects/src/test.git"
            gitdir.mkdir(parents=True)
            cmd = ["git", "init", "--bare", str(gitdir)]
            subprocess.check_call(cmd)

            dotgit = tempdir / "src/test/.git"
            dotgit.mkdir(parents=True)
            for name in cls._SYMLINKS:
                (dotgit / name).symlink_to(
                    f"../../../.repo/projects/src/test.git/{name}"
                )
            for name in cls._FILES | cls._CLEAN_FILES:
                (dotgit / name).write_text(name)

            yield tempdir

    def test_standard(self):
        """Migrate a standard checkout that we expect."""
        with self._simple_layout() as tempdir:
            dotgit = tempdir / "src/test/.git"
            project.Project._MigrateOldWorkTreeGitDir(str(dotgit))

            # Make sure the dir was transformed into a symlink.
            self.assertTrue(dotgit.is_symlink())
            self.assertEqual(
                os.readlink(dotgit),
                os.path.normpath("../../.repo/projects/src/test.git"),
            )

            # Make sure files were moved over.
            gitdir = tempdir / ".repo/projects/src/test.git"
            for name in self._FILES:
                self.assertEqual(name, (gitdir / name).read_text())
            # Make sure files were removed.
            for name in self._CLEAN_FILES:
                self.assertFalse((gitdir / name).exists())

    def test_unknown(self):
        """A checkout with unknown files should abort."""
        with self._simple_layout() as tempdir:
            dotgit = tempdir / "src/test/.git"
            (tempdir / ".repo/projects/src/test.git/random-file").write_text(
                "one"
            )
            (dotgit / "random-file").write_text("two")
            with self.assertRaises(error.GitError):
                project.Project._MigrateOldWorkTreeGitDir(str(dotgit))

            # Make sure no content was actually changed.
            self.assertTrue(dotgit.is_dir())
            for name in self._FILES:
                self.assertTrue((dotgit / name).is_file())
            for name in self._CLEAN_FILES:
                self.assertTrue((dotgit / name).is_file())
            for name in self._SYMLINKS:
                self.assertTrue((dotgit / name).is_symlink())


class ManifestPropertiesFetchedCorrectly(unittest.TestCase):
    """Ensure properties are fetched properly."""

    def setUpManifest(self, tempdir):
        repodir = os.path.join(tempdir, ".repo")
        manifest_dir = os.path.join(repodir, "manifests")
        manifest_file = os.path.join(repodir, manifest_xml.MANIFEST_FILE_NAME)
        os.mkdir(repodir)
        os.mkdir(manifest_dir)
        manifest = manifest_xml.XmlManifest(repodir, manifest_file)

        return project.ManifestProject(
            manifest, "test/manifest", os.path.join(tempdir, ".git"), tempdir
        )

    def test_manifest_config_properties(self):
        """Test we are fetching the manifest config properties correctly."""

        with TempGitTree() as tempdir:
            fakeproj = self.setUpManifest(tempdir)

            # Set property using the expected Set method, then ensure
            # the porperty functions are using the correct Get methods.
            fakeproj.config.SetString(
                "manifest.standalone", "https://chicken/manifest.git"
            )
            self.assertEqual(
                fakeproj.standalone_manifest_url, "https://chicken/manifest.git"
            )

            fakeproj.config.SetString(
                "manifest.groups", "test-group, admin-group"
            )
            self.assertEqual(
                fakeproj.manifest_groups, "test-group, admin-group"
            )

            fakeproj.config.SetString("repo.reference", "mirror/ref")
            self.assertEqual(fakeproj.reference, "mirror/ref")

            fakeproj.config.SetBoolean("repo.dissociate", False)
            self.assertFalse(fakeproj.dissociate)

            fakeproj.config.SetBoolean("repo.archive", False)
            self.assertFalse(fakeproj.archive)

            fakeproj.config.SetBoolean("repo.mirror", False)
            self.assertFalse(fakeproj.mirror)

            fakeproj.config.SetBoolean("repo.worktree", False)
            self.assertFalse(fakeproj.use_worktree)

            fakeproj.config.SetBoolean("repo.clonebundle", False)
            self.assertFalse(fakeproj.clone_bundle)

            fakeproj.config.SetBoolean("repo.submodules", False)
            self.assertFalse(fakeproj.submodules)

            fakeproj.config.SetBoolean("repo.git-lfs", False)
            self.assertFalse(fakeproj.git_lfs)

            fakeproj.config.SetBoolean("repo.superproject", False)
            self.assertFalse(fakeproj.use_superproject)

            fakeproj.config.SetBoolean("repo.partialclone", False)
            self.assertFalse(fakeproj.partial_clone)

            fakeproj.config.SetString("repo.depth", "48")
            self.assertEqual(fakeproj.depth, 48)

            fakeproj.config.SetString("repo.depth", "invalid_depth")
            self.assertEqual(fakeproj.depth, None)

            fakeproj.config.SetString("repo.clonefilter", "blob:limit=10M")
            self.assertEqual(fakeproj.clone_filter, "blob:limit=10M")

            fakeproj.config.SetString(
                "repo.partialcloneexclude", "third_party/big_repo"
            )
            self.assertEqual(
                fakeproj.partial_clone_exclude, "third_party/big_repo"
            )

            fakeproj.config.SetString("manifest.platform", "auto")
            self.assertEqual(fakeproj.manifest_platform, "auto")
