import collections
import filecmp
import logging
import os
import shutil

import pytest
from mock import patch

from dvc.dvcfile import DVC_FILE_SUFFIX, Dvcfile
from dvc.exceptions import (
    CheckoutError,
    CheckoutErrorSuggestGit,
    ConfirmRemoveError,
    DvcException,
)
from dvc.main import main
from dvc.remote import S3Remote
from dvc.remote.local import LocalRemote
from dvc.repo import Repo as DvcRepo
from dvc.stage import Stage
from dvc.stage.exceptions import (
    StageFileBadNameError,
    StageFileDoesNotExistError,
)
from dvc.system import System
from dvc.utils import relpath
from dvc.utils.fs import walk_files
from dvc.utils.stage import dump_stage_file, load_stage_file
from tests.basic_env import TestDvc, TestDvcGit
from tests.func.test_repro import TestRepro
from tests.remotes import S3

logger = logging.getLogger("dvc")


class TestCheckout(TestRepro):
    def setUp(self):
        super().setUp()

        stages = self.dvc.add(self.DATA_DIR)
        self.assertEqual(len(stages), 1)
        self.data_dir_stage = stages[0]
        self.assertTrue(self.data_dir_stage is not None)

        self.orig = "orig"
        shutil.copy(self.FOO, self.orig)
        os.unlink(self.FOO)

        self.orig_dir = "orig_dir"
        shutil.copytree(self.DATA_DIR, self.orig_dir)
        shutil.rmtree(self.DATA_DIR)

    def test(self):
        self.dvc.checkout(force=True)
        self._test_checkout()

    def _test_checkout(self):
        self.assertTrue(os.path.isfile(self.FOO))
        self.assertTrue(filecmp.cmp(self.FOO, self.orig, shallow=False))


class TestCheckoutSingleStage(TestCheckout):
    def test(self):
        ret = main(["checkout", "--force", self.foo_stage.path])
        self.assertEqual(ret, 0)

        ret = main(["checkout", "--force", self.data_dir_stage.path])
        self.assertEqual(ret, 0)

        self._test_checkout()


class TestCheckoutCorruptedCacheFile(TestRepro):
    def test(self):
        cache = self.foo_stage.outs[0].cache_path

        os.chmod(cache, 0o644)
        with open(cache, "a") as fd:
            fd.write("1")

        with pytest.raises(CheckoutError):
            self.dvc.checkout(force=True)

        self.assertFalse(os.path.isfile(self.FOO))
        self.assertFalse(os.path.isfile(cache))


class TestCheckoutCorruptedCacheDir(TestDvc):
    def test(self):
        # NOTE: using 'copy' so that cache and link don't have same inode
        ret = main(["config", "cache.type", "copy"])
        self.assertEqual(ret, 0)

        self.dvc = DvcRepo(".")
        stages = self.dvc.add(self.DATA_DIR)
        self.assertEqual(len(stages), 1)
        self.assertEqual(len(stages[0].outs), 1)
        out = stages[0].outs[0]

        # NOTE: modifying cache file for one of the files inside the directory
        # to check if dvc will detect that the cache is corrupted.
        entry = self.dvc.cache.local.load_dir_cache(out.checksum)[0]
        checksum = entry[self.dvc.cache.local.PARAM_CHECKSUM]
        cache = self.dvc.cache.local.get(checksum)

        os.chmod(cache, 0o644)
        with open(cache, "w+") as fobj:
            fobj.write("1")

        with pytest.raises(CheckoutError):
            self.dvc.checkout(force=True)

        self.assertFalse(os.path.exists(cache))


class TestCmdCheckout(TestCheckout):
    def test(self):
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)
        self._test_checkout()


class CheckoutBase(TestDvcGit):
    GIT_IGNORE = ".gitignore"

    def commit_data_file(self, fname, content="random text"):
        with open(fname, "w") as fd:
            fd.write(content)
        stages = self.dvc.add(fname)
        self.assertEqual(len(stages), 1)
        self.assertTrue(stages[0] is not None)
        self.dvc.scm.add([fname + ".dvc", ".gitignore"])
        self.dvc.scm.commit("adding " + fname)

    def read_ignored(self):
        with open(self.GIT_IGNORE) as f:
            return [s.strip("\n") for s in f.readlines()]

    def outs_info(self, stage):
        FileInfo = collections.namedtuple("FileInfo", "path inode")

        paths = [
            path
            for output in stage["outs"]
            for path in self.dvc.tree.walk_files(output["path"])
        ]

        return [
            FileInfo(path=path, inode=System.inode(path)) for path in paths
        ]


class TestRemoveFilesWhenCheckout(CheckoutBase):
    def test(self):
        fname = "file_in_a_branch"
        branch_master = "master"
        branch_1 = "b1"

        self.dvc.scm.add(self.dvc.scm.untracked_files())
        self.dvc.scm.commit("add all files")

        # add the file into a separate branch
        self.dvc.scm.checkout(branch_1, True)
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)
        self.commit_data_file(fname)

        # Checkout back in master
        self.dvc.scm.checkout(branch_master)
        self.assertTrue(os.path.exists(fname))

        # Make sure `dvc checkout` removes the file
        # self.dvc.checkout()
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)
        self.assertFalse(os.path.exists(fname))


class TestCheckoutCleanWorkingDir(CheckoutBase):
    @patch("dvc.prompt.confirm", return_value=True)
    def test(self, mock_prompt):
        mock_prompt.return_value = True

        stages = self.dvc.add(self.DATA_DIR)
        stage = stages[0]

        working_dir_change = os.path.join(self.DATA_DIR, "not_cached.txt")
        with open(working_dir_change, "w") as f:
            f.write("not_cached")

        ret = main(["checkout", stage.relpath])
        self.assertEqual(ret, 0)
        self.assertFalse(os.path.exists(working_dir_change))

    @patch("dvc.prompt.confirm", return_value=False)
    def test_force(self, mock_prompt):
        mock_prompt.return_value = False

        stages = self.dvc.add(self.DATA_DIR)
        self.assertEqual(len(stages), 1)
        stage = stages[0]

        working_dir_change = os.path.join(self.DATA_DIR, "not_cached.txt")
        with open(working_dir_change, "w") as f:
            f.write("not_cached")

        ret = main(["checkout", stage.relpath])
        self.assertNotEqual(ret, 0)

        mock_prompt.assert_called()
        self.assertNotEqual(ret, 0)
        self.assertRaises(DvcException)


class TestCheckoutSelectiveRemove(CheckoutBase):
    def test(self):
        # Use copy to test for changes in the inodes
        ret = main(["config", "cache.type", "copy"])
        self.assertEqual(ret, 0)

        ret = main(["add", self.DATA_DIR])
        self.assertEqual(0, ret)

        stage_path = self.DATA_DIR + DVC_FILE_SUFFIX
        stage = load_stage_file(stage_path)
        staged_files = self.outs_info(stage)

        # move instead of remove, to lock inode assigned to stage_files[0].path
        # if we were to use remove, we might end up with same inode assigned to
        # newly checked out file
        shutil.move(staged_files[0].path, "random_name")

        ret = main(["checkout", "--force", stage_path])
        self.assertEqual(ret, 0)

        checkedout_files = self.outs_info(stage)

        self.assertEqual(len(staged_files), len(checkedout_files))
        self.assertEqual(staged_files[0].path, checkedout_files[0].path)
        self.assertNotEqual(staged_files[0].inode, checkedout_files[0].inode)
        self.assertEqual(staged_files[1].inode, checkedout_files[1].inode)


class TestGitIgnoreBasic(CheckoutBase):
    def test(self):
        fname1 = "file_1"
        fname2 = "file_2"
        fname3 = "file_3"

        self.dvc.scm.add(self.dvc.scm.untracked_files())
        self.dvc.scm.commit("add all files")

        self.assertFalse(os.path.exists(self.GIT_IGNORE))

        self.commit_data_file(fname1)
        self.commit_data_file(fname2)
        self.dvc.run(
            single_stage=True,
            cmd=f"python {self.CODE} {self.FOO} {fname3}",
            deps=[self.CODE, self.FOO],
            outs_no_cache=[fname3],
        )

        self.assertTrue(os.path.exists(self.GIT_IGNORE))

        ignored = self.read_ignored()

        self.assertEqual(len(ignored), 2)

        self.assertIn("/" + fname1, ignored)
        self.assertIn("/" + fname2, ignored)


class TestGitIgnoreWhenCheckout(CheckoutBase):
    def test(self):
        fname_master = "file_in_a_master"
        branch_master = "master"
        fname_branch = "file_in_a_branch"
        branch_1 = "b1"

        self.dvc.scm.add(self.dvc.scm.untracked_files())
        self.dvc.scm.commit("add all files")
        self.commit_data_file(fname_master)

        self.dvc.scm.checkout(branch_1, True)
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)
        self.commit_data_file(fname_branch)

        self.dvc.scm.checkout(branch_master)
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)

        ignored = self.read_ignored()

        self.assertEqual(len(ignored), 1)
        self.assertIn("/" + fname_master, ignored)

        self.dvc.scm.checkout(branch_1)
        ret = main(["checkout", "--force"])
        self.assertEqual(ret, 0)
        ignored = self.read_ignored()
        self.assertIn("/" + fname_branch, ignored)


class TestCheckoutMissingMd5InStageFile(TestRepro):
    def test(self):
        d = load_stage_file(self.file1_stage)
        del d[Stage.PARAM_OUTS][0][LocalRemote.PARAM_CHECKSUM]
        del d[Stage.PARAM_DEPS][0][LocalRemote.PARAM_CHECKSUM]
        dump_stage_file(self.file1_stage, d)

        with pytest.raises(CheckoutError):
            self.dvc.checkout(force=True)


class TestCheckoutEmptyDir(TestDvc):
    def test(self):
        dname = "empty_dir"
        os.mkdir(dname)

        stages = self.dvc.add(dname)
        self.assertEqual(len(stages), 1)
        stage = stages[0]
        self.assertTrue(stage is not None)
        self.assertEqual(len(stage.outs), 1)

        stage.outs[0].remove()
        self.assertFalse(os.path.exists(dname))

        stats = self.dvc.checkout(force=True)
        assert stats["added"] == [dname + os.sep]

        self.assertTrue(os.path.isdir(dname))
        self.assertEqual(len(os.listdir(dname)), 0)


class TestCheckoutNotCachedFile(TestDvc):
    def test(self):
        cmd = "python {} {} {}".format(self.CODE, self.FOO, "out")

        self.dvc.add(self.FOO)
        stage = self.dvc.run(
            cmd=cmd,
            deps=[self.FOO, self.CODE],
            outs_no_cache=["out"],
            single_stage=True,
        )
        self.assertTrue(stage is not None)

        stats = self.dvc.checkout(force=True)
        assert not any(stats.values())


class TestCheckoutWithDeps(TestRepro):
    def test(self):
        os.unlink(self.FOO)
        os.unlink(self.file1)

        self.assertFalse(os.path.exists(self.FOO))
        self.assertFalse(os.path.exists(self.file1))

        ret = main(["checkout", "--force", self.file1_stage, "--with-deps"])
        self.assertEqual(ret, 0)

        self.assertTrue(os.path.exists(self.FOO))
        self.assertTrue(os.path.exists(self.file1))


class TestCheckoutDirectory(TestRepro):
    def test(self):
        stage = self.dvc.add(self.DATA_DIR)[0]

        shutil.rmtree(self.DATA_DIR)
        self.assertFalse(os.path.exists(self.DATA_DIR))

        ret = main(["checkout", stage.path])
        self.assertEqual(ret, 0)

        self.assertTrue(os.path.exists(self.DATA_DIR))


class TestCheckoutHook(TestDvc):
    @patch("sys.stdout.isatty", return_value=True)
    @patch("dvc.prompt.input", side_effect=EOFError)
    def test(self, mock_input, mock_isatty):
        """ Test that dvc checkout handles EOFError gracefully, which is what
        it will experience when running in a git hook.
        """
        stages = self.dvc.add(self.DATA_DIR)
        self.assertEqual(len(stages), 1)
        stage = stages[0]
        self.assertNotEqual(stage, None)

        self.create(os.path.join(self.DATA_DIR, "test"), "test")

        with self.assertRaises(ConfirmRemoveError):
            self.dvc.checkout()


class TestCheckoutSuggestGit(TestRepro):
    def test(self):

        try:
            self.dvc.checkout(targets=["gitbranch"])
        except DvcException as exc:
            self.assertIsInstance(exc, CheckoutErrorSuggestGit)
            self.assertIsInstance(exc.__cause__, StageFileDoesNotExistError)
            self.assertIsNone(exc.__cause__.__cause__)

        try:
            self.dvc.checkout(targets=[self.FOO])
        except DvcException as exc:
            self.assertIsInstance(exc, CheckoutErrorSuggestGit)
            self.assertIsInstance(exc.__cause__, StageFileBadNameError)
            self.assertIsNone(exc.__cause__.__cause__)


class TestCheckoutTargetRecursiveShouldNotRemoveOtherUsedFiles(TestDvc):
    def test(self):
        ret = main(["add", self.DATA_DIR, self.FOO, self.BAR])
        self.assertEqual(0, ret)

        ret = main(["checkout", "-R", self.DATA_DIR])
        self.assertEqual(0, ret)

        self.assertTrue(os.path.exists(self.FOO))
        self.assertTrue(os.path.exists(self.BAR))


class TestCheckoutRecursiveNotDirectory(TestDvc):
    def test(self):
        ret = main(["add", self.FOO])
        self.assertEqual(0, ret)

        stats = self.dvc.checkout(targets=[self.FOO + ".dvc"], recursive=True)
        assert stats == {"added": [], "modified": [], "deleted": []}


class TestCheckoutMovedCacheDirWithSymlinks(TestDvc):
    def test(self):
        ret = main(["config", "cache.type", "symlink"])
        self.assertEqual(ret, 0)

        ret = main(["add", self.FOO])
        self.assertEqual(ret, 0)

        ret = main(["add", self.DATA_DIR])
        self.assertEqual(ret, 0)

        self.assertTrue(System.is_symlink(self.FOO))
        old_foo_link = os.path.realpath(self.FOO)

        self.assertTrue(System.is_symlink(self.DATA))
        old_data_link = os.path.realpath(self.DATA)

        old_cache_dir = self.dvc.cache.local.cache_dir
        new_cache_dir = old_cache_dir + "_new"
        os.rename(old_cache_dir, new_cache_dir)

        ret = main(["cache", "dir", new_cache_dir])
        self.assertEqual(ret, 0)

        ret = main(["checkout", "-f"])
        self.assertEqual(ret, 0)

        self.assertTrue(System.is_symlink(self.FOO))
        new_foo_link = os.path.realpath(self.FOO)

        self.assertTrue(System.is_symlink(self.DATA))
        new_data_link = os.path.realpath(self.DATA)

        self.assertEqual(
            relpath(old_foo_link, old_cache_dir),
            relpath(new_foo_link, new_cache_dir),
        )

        self.assertEqual(
            relpath(old_data_link, old_cache_dir),
            relpath(new_data_link, new_cache_dir),
        )


def test_checkout_no_checksum(tmp_dir, dvc):
    tmp_dir.gen("file", "file content")
    stage = dvc.run(
        outs=["file"], no_exec=True, cmd="somecmd", single_stage=True
    )

    with pytest.raises(CheckoutError):
        dvc.checkout([stage.path], force=True)

    assert not os.path.exists("file")


@pytest.mark.parametrize(
    "link, link_test_func",
    [("hardlink", System.is_hardlink), ("symlink", System.is_symlink)],
)
def test_checkout_relink(tmp_dir, dvc, link, link_test_func):
    dvc.cache.local.cache_types = [link]

    tmp_dir.dvc_gen({"dir": {"data": "text"}})
    dvc.unprotect("dir/data")
    assert not link_test_func("dir/data")

    stats = dvc.checkout(["dir.dvc"], relink=True)
    assert stats == empty_checkout
    assert link_test_func("dir/data")


@pytest.mark.parametrize("link", ["hardlink", "symlink", "copy"])
def test_checkout_relink_protected(tmp_dir, dvc, link):
    dvc.cache.local.cache_types = [link]

    tmp_dir.dvc_gen("foo", "foo")
    dvc.unprotect("foo")
    assert os.access("foo", os.W_OK)

    stats = dvc.checkout(["foo.dvc"], relink=True)
    assert stats == empty_checkout

    # NOTE: Windows symlink perms don't propagate to the target
    if link == "copy" or (link == "symlink" and os.name == "nt"):
        assert os.access("foo", os.W_OK)
    else:
        assert not os.access("foo", os.W_OK)


@pytest.mark.parametrize(
    "target",
    [os.path.join("dir", "subdir"), os.path.join("dir", "subdir", "file")],
)
def test_partial_checkout(tmp_dir, dvc, target):
    tmp_dir.dvc_gen({"dir": {"subdir": {"file": "file"}, "other": "other"}})
    shutil.rmtree("dir")
    stats = dvc.checkout([target])
    assert stats["added"] == ["dir" + os.sep]
    assert list(walk_files("dir")) == [os.path.join("dir", "subdir", "file")]


empty_checkout = {"added": [], "deleted": [], "modified": []}


def test_stats_on_empty_checkout(tmp_dir, dvc, scm):
    assert dvc.checkout() == empty_checkout
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}, "other": "other"}},
        commit="initial",
    )
    assert dvc.checkout() == empty_checkout


def test_stats_on_checkout(tmp_dir, dvc, scm):
    tmp_dir.dvc_gen(
        {
            "dir": {"subdir": {"file": "file"}, "other": "other"},
            "foo": "foo",
            "bar": "bar",
        },
        commit="initial",
    )
    scm.checkout("HEAD~")
    stats = dvc.checkout()
    assert set(stats["deleted"]) == {"dir" + os.sep, "foo", "bar"}

    scm.checkout("-")
    stats = dvc.checkout()
    assert set(stats["added"]) == {"bar", "dir" + os.sep, "foo"}

    tmp_dir.gen({"lorem": "lorem", "bar": "new bar", "dir2": {"file": "file"}})
    (tmp_dir / "foo").unlink()
    scm.repo.git.rm("foo.dvc")
    tmp_dir.dvc_add(["bar", "lorem", "dir2"], commit="second")

    scm.checkout("HEAD~")
    stats = dvc.checkout()
    assert set(stats["modified"]) == {"bar"}
    assert set(stats["added"]) == {"foo"}
    assert set(stats["deleted"]) == {"lorem", "dir2" + os.sep}

    scm.checkout("-")
    stats = dvc.checkout()
    assert set(stats["modified"]) == {"bar"}
    assert set(stats["added"]) == {"dir2" + os.sep, "lorem"}
    assert set(stats["deleted"]) == {"foo"}


def test_checkout_stats_on_failure(tmp_dir, dvc, scm):
    tmp_dir.dvc_gen(
        {"foo": "foo", "dir": {"subdir": {"file": "file"}}, "other": "other"},
        commit="initial",
    )
    stage = Dvcfile(dvc, "foo.dvc").stage
    tmp_dir.dvc_gen({"foo": "foobar", "other": "other other"}, commit="second")

    # corrupt cache
    cache = stage.outs[0].cache_path
    os.chmod(cache, 0o644)
    with open(cache, "a") as fd:
        fd.write("destroy cache")

    scm.checkout("HEAD~")
    with pytest.raises(CheckoutError) as exc:
        dvc.checkout(force=True)

    assert exc.value.stats == {
        **empty_checkout,
        "failed": ["foo"],
        "modified": ["other"],
    }


def test_stats_on_added_file_from_tracked_dir(tmp_dir, dvc, scm):
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}, "other": "other"}},
        commit="initial",
    )

    tmp_dir.gen("dir/subdir/newfile", "newfile")
    tmp_dir.dvc_add("dir", commit="add newfile")
    scm.checkout("HEAD~")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout

    scm.checkout("-")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout


def test_stats_on_updated_file_from_tracked_dir(tmp_dir, dvc, scm):
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}, "other": "other"}},
        commit="initial",
    )

    tmp_dir.gen("dir/subdir/file", "what file?")
    tmp_dir.dvc_add("dir", commit="update file")
    scm.checkout("HEAD~")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout

    scm.checkout("-")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout


def test_stats_on_removed_file_from_tracked_dir(tmp_dir, dvc, scm):
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}, "other": "other"}},
        commit="initial",
    )

    (tmp_dir / "dir" / "subdir" / "file").unlink()
    tmp_dir.dvc_add("dir", commit="removed file from subdir")
    scm.checkout("HEAD~")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout

    scm.checkout("-")
    assert dvc.checkout() == {**empty_checkout, "modified": ["dir" + os.sep]}
    assert dvc.checkout() == empty_checkout


def test_stats_on_show_changes_does_not_show_summary(
    tmp_dir, dvc, scm, caplog
):
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}}, "other": "other"},
        commit="initial",
    )
    scm.checkout("HEAD~")

    with caplog.at_level(logging.INFO, logger="dvc"):
        caplog.clear()
        assert main(["checkout"]) == 0
        for out in ["D\tdir" + os.sep, "D\tother"]:
            assert out in caplog.text
        assert "modified" not in caplog.text
        assert "deleted" not in caplog.text
        assert "added" not in caplog.text


def test_stats_does_not_show_changes_by_default(tmp_dir, dvc, scm, caplog):
    tmp_dir.dvc_gen(
        {"dir": {"subdir": {"file": "file"}}, "other": "other"},
        commit="initial",
    )
    scm.checkout("HEAD~")

    with caplog.at_level(logging.INFO, logger="dvc"):
        caplog.clear()
        assert main(["checkout", "--summary"]) == 0
        assert "2 files deleted" in caplog.text
        assert "dir" not in caplog.text
        assert "other" not in caplog.text


@pytest.mark.parametrize("link", ["hardlink", "symlink", "copy"])
def test_checkout_with_relink_existing(tmp_dir, dvc, link):
    tmp_dir.dvc_gen("foo", "foo")
    (tmp_dir / "foo").unlink()

    tmp_dir.dvc_gen("bar", "bar")
    dvc.cache.local.cache_types = [link]

    stats = dvc.checkout(relink=True)
    assert stats == {**empty_checkout, "added": ["foo"]}


def test_checkout_with_deps(tmp_dir, dvc):
    tmp_dir.dvc_gen({"foo": "foo"})
    dvc.run(
        fname="copy_file.dvc",
        cmd="echo foo > bar",
        outs=["bar"],
        deps=["foo"],
        single_stage=True,
    )

    (tmp_dir / "bar").unlink()
    (tmp_dir / "foo").unlink()

    stats = dvc.checkout(["copy_file.dvc"], with_deps=False)
    assert stats == {**empty_checkout, "added": ["bar"]}

    (tmp_dir / "bar").unlink()
    stats = dvc.checkout(["copy_file.dvc"], with_deps=True)
    assert set(stats["added"]) == {"foo", "bar"}


def test_checkout_recursive(tmp_dir, dvc):
    tmp_dir.gen({"dir": {"foo": "foo", "bar": "bar"}})
    dvc.add("dir", recursive=True)

    (tmp_dir / "dir" / "foo").unlink()
    (tmp_dir / "dir" / "bar").unlink()

    stats = dvc.checkout(["dir"], recursive=True)
    assert set(stats["added"]) == {
        os.path.join("dir", "foo"),
        os.path.join("dir", "bar"),
    }


@pytest.mark.skipif(
    not S3.should_test(), reason="Only run with S3 credentials"
)
def test_checkout_for_external_outputs(tmp_dir, dvc):
    dvc.cache.s3 = S3Remote(dvc, {"url": S3.get_url()})

    remote = S3Remote(dvc, {"url": S3.get_url()})
    file_path = remote.path_info / "foo"
    remote.s3.put_object(
        Bucket=remote.path_info.bucket, Key=file_path.path, Body="foo"
    )

    dvc.add(str(remote.path_info / "foo"))

    remote.remove(file_path)
    stats = dvc.checkout(force=True)
    assert stats == {**empty_checkout, "added": [str(file_path)]}
    assert remote.exists(file_path)

    remote.s3.put_object(
        Bucket=remote.path_info.bucket, Key=file_path.path, Body="foo\nfoo"
    )
    stats = dvc.checkout(force=True)
    assert stats == {**empty_checkout, "modified": [str(file_path)]}


def test_checkouts_for_pipeline_tracked_outs(tmp_dir, dvc, scm, run_copy):
    from dvc.dvcfile import PIPELINE_FILE

    tmp_dir.gen("foo", "foo")
    stage1 = run_copy("foo", "bar", name="copy-foo-bar")
    tmp_dir.gen("lorem", "lorem")
    stage2 = run_copy("lorem", "ipsum", name="copy-lorem-ipsum")

    for out in ["bar", "ipsum"]:
        (tmp_dir / out).unlink()
    assert dvc.checkout(["bar"])["added"] == ["bar"]

    (tmp_dir / "bar").unlink()
    assert set(dvc.checkout([PIPELINE_FILE])["added"]) == {"bar", "ipsum"}

    for out in ["bar", "ipsum"]:
        (tmp_dir / out).unlink()
    assert set(dvc.checkout([stage1.addressing])["added"]) == {"bar"}

    (tmp_dir / "bar").unlink()
    assert set(dvc.checkout([stage2.addressing])["added"]) == {"ipsum"}

    (tmp_dir / "ipsum").unlink()
    assert set(dvc.checkout()["added"]) == {"bar", "ipsum"}