# Copyright 2016 The ChromiumOS Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Unit tests for git_metrics."""

import os
import subprocess
from unittest import mock

from chromite.lib import cros_test_lib
from chromite.lib import osutils
from chromite.scripts.sysmon import git_metrics


# pylint: disable=protected-access


class TestGitMetricCollector(cros_test_lib.TestCase):
    """Tests for _GitMetricCollector."""

    def setUp(self) -> None:
        patcher = mock.patch(
            "chromite.third_party.infra_libs.ts_mon.common.interface.state."
            "store",
            autospec=True,
        )
        self.store = patcher.start()
        self.addCleanup(patcher.stop)

    def test_collect(self) -> None:
        with mock.patch.object(
            git_metrics, "_GitRepo", autospec=True
        ) as _GitRepo:
            instance = _GitRepo("stub")
            instance.get_commit_hash.return_value = (
                "2b1ce059425edc91e013c260e59019195f927a07"
            )
            instance.get_commit_time.return_value = 1483257600
            instance.get_unstaged_changes.return_value = (0, 3)

            collector = git_metrics._GitMetricCollector("~/solciel", "stub")
            collector.collect()

        setter = self.store.set
        calls = [
            mock.call(
                "git/hash",
                ("~/solciel",),
                None,
                "2b1ce059425edc91e013c260e59019195f927a07",
                enforce_ge=mock.ANY,
            ),
            mock.call(
                "git/timestamp",
                ("~/solciel",),
                None,
                1483257600,
                enforce_ge=mock.ANY,
            ),
            mock.call(
                "git/unstaged_changes",
                ("added", "~/solciel"),
                None,
                0,
                enforce_ge=mock.ANY,
            ),
            mock.call(
                "git/unstaged_changes",
                ("deleted", "~/solciel"),
                None,
                3,
                enforce_ge=mock.ANY,
            ),
        ]
        setter.assert_has_calls(calls)
        self.assertEqual(len(setter.mock_calls), len(calls))


class TestGitRepoWithTempdir(cros_test_lib.TempDirTestCase):
    """Tests for _GitRepo using a Git fixture."""

    def setUp(self) -> None:
        self.git_dir = os.path.join(self.tempdir, ".git")

        def call(args, **kwargs) -> None:
            subprocess.check_call(
                args,
                stdout=subprocess.DEVNULL,
                stderr=subprocess.DEVNULL,
                **kwargs,
            )

        with osutils.ChdirContext(self.tempdir):
            call(["git", "init"])
            call(["git", "config", "user.name", "John Doe"])
            call(["git", "config", "user.email", "john@example.com"])
            osutils.WriteFile("foo", "a\nb\nc\n")
            call(["git", "add", "foo"])
            env = os.environ.copy()
            env["GIT_AUTHOR_DATE"] = "2017-01-01T00:00:00Z"
            env["GIT_COMMITTER_DATE"] = "2017-01-01T00:00:00Z"
            call(["git", "commit", "-m", "Initial commit"], env=env)

    def test_get_commit_hash(self) -> None:
        """Test get_commit_hash()."""
        repo = git_metrics._GitRepo(self.git_dir)
        got = repo.get_commit_hash()
        self.assertEqual(got, "7c88f131e520e8455e2403b88ff4f723758c5dd6")

    def test_get_commit_time(self) -> None:
        """Test get_commit_time()."""
        repo = git_metrics._GitRepo(self.git_dir)
        got = repo.get_commit_time()
        self.assertEqual(got, 1483228800)

    def test_get_unstaged_changes(self) -> None:
        """Test get_unstaged_changes()."""
        (self.tempdir / "spam").write_text("a\n", encoding="utf-8")
        os.remove(os.path.join(self.tempdir, "foo"))
        repo = git_metrics._GitRepo(self.git_dir)
        added, removed = repo.get_unstaged_changes()
        self.assertEqual(added, 0)  # Does not count untracked files
        self.assertEqual(removed, 3)