"""Testing dirstack"""
import os
import os.path
import subprocess
import sys

import pytest

from xonsh import dirstack
from xonsh.dirstack import DIRSTACK, _unc_tempDrives
from xonsh.platform import ON_WINDOWS

HERE = os.path.abspath(os.path.dirname(__file__))
PARENT = os.path.dirname(HERE)


def drive_in_use(letter):
    return ON_WINDOWS and os.system(f"vol {letter}: 2>nul>nul") == 0


MAX_TEMP_DRIVES = 4
TEMP_DRIVE = []

for d in "zyxwvuts":
    if not drive_in_use(d):
        TEMP_DRIVE.append(d + ":")
pytestmark = pytest.mark.skipif(
    len(TEMP_DRIVE) < MAX_TEMP_DRIVES,
    reason="Too many drive letters are already used by Windows to run the tests.",
)
xfail_py310 = pytest.mark.xfail(
    sys.version_info >= (3, 10),
    reason="throws file-not-found error (todo: fix)",
)


@pytest.fixture(scope="module")
def shares_setup(tmpdir_factory):
    """create some shares to play with on current machine.

    Yield (to test case) array of structs: [uncPath, driveLetter, equivLocalPath]

    Side effect: `os.chdir(TEST_WORK_DIR)`
    """

    if not ON_WINDOWS:
        return []

    shares = [
        [r"uncpushd_test_HERE", TEMP_DRIVE[1], HERE],
        [r"uncpushd_test_PARENT", TEMP_DRIVE[3], PARENT],
    ]

    for (
        s,
        d,
        l,
    ) in (
        shares
    ):  # set up some shares on local machine.  dirs already exist test case must invoke wd_setup.
        rtn = subprocess.call(
            ["NET", "SHARE", s, "/delete"], universal_newlines=True
        )  # clean up from previous run after good, long wait.
        if rtn != 0:
            yield None
            return
        rtn = subprocess.call(["NET", "SHARE", s + "=" + l], universal_newlines=True)
        if rtn != 0:
            yield None
            return
        rtn = subprocess.call(
            ["NET", "USE", d, r"\\localhost" + "\\" + s], universal_newlines=True
        )
        if rtn != 0:
            yield None
            return

    yield [[r"\\localhost" + "\\" + s[0], s[1], s[2]] for s in shares]

    # we want to delete the test shares we've created, but can't do that if unc shares in DIRSTACK
    # (left over from assert fail aborted test)
    os.chdir(HERE)
    for dl in _unc_tempDrives:
        subprocess.call(["net", "use", dl, "/delete"], universal_newlines=True)
    for _, d, _ in shares:
        subprocess.call(["net", "use", d, "/delete"], universal_newlines=True)
        # subprocess.call(['net', 'share', s, '/delete'], universal_newlines=True) # fails with access denied,
        # unless I wait > 10 sec. see http://stackoverflow.com/questions/38448413/access-denied-in-net-share-delete


def test_pushdpopd(xession):
    """Simple non-UNC push/pop to verify we didn't break nonUNC case."""
    xession.env.update(dict(CDPATH=PARENT, PWD=HERE))

    dirstack.cd([PARENT])
    owd = os.getcwd()
    assert owd.casefold() == xession.env["PWD"].casefold()
    dirstack.pushd([HERE])
    wd = os.getcwd()
    assert wd.casefold() == HERE.casefold()
    dirstack.popd([])
    assert owd.casefold() == os.getcwd().casefold(), "popd returned cwd to expected dir"


def test_cd_dot(xession):
    xession.env.update(dict(PWD=os.getcwd()))

    owd = os.getcwd().casefold()
    dirstack.cd(["."])
    assert owd == os.getcwd().casefold()


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_simple_push_pop(xession, shares_setup):
    if shares_setup is None:
        return
    xession.env.update(dict(CDPATH=PARENT, PWD=HERE))
    dirstack.cd([PARENT])
    owd = os.getcwd()
    assert owd.casefold() == xession.env["PWD"].casefold()
    dirstack.pushd([r"\\localhost\uncpushd_test_HERE"])
    wd = os.getcwd()
    assert os.path.splitdrive(wd)[0].casefold() == TEMP_DRIVE[0]
    assert os.path.splitdrive(wd)[1].casefold() == "\\"
    dirstack.popd([])
    assert owd.casefold() == os.getcwd().casefold(), "popd returned cwd to expected dir"
    assert len(_unc_tempDrives) == 0


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_push_to_same_share(xession, shares_setup):
    if shares_setup is None:
        return
    xession.env.update(dict(CDPATH=PARENT, PWD=HERE))

    dirstack.cd([PARENT])
    owd = os.getcwd()
    assert owd.casefold() == xession.env["PWD"].casefold()
    dirstack.pushd([r"\\localhost\uncpushd_test_HERE"])
    wd = os.getcwd()
    assert os.path.splitdrive(wd)[0].casefold() == TEMP_DRIVE[0]
    assert os.path.splitdrive(wd)[1].casefold() == "\\"
    assert len(_unc_tempDrives) == 1
    assert len(DIRSTACK) == 1

    dirstack.pushd([r"\\localhost\uncpushd_test_HERE"])
    wd = os.getcwd()
    assert os.path.splitdrive(wd)[0].casefold() == TEMP_DRIVE[0]
    assert os.path.splitdrive(wd)[1].casefold() == "\\"
    assert len(_unc_tempDrives) == 1
    assert len(DIRSTACK) == 2

    dirstack.popd([])
    assert os.path.isdir(
        TEMP_DRIVE[0] + "\\"
    ), "Temp drive not unmapped till last reference removed"
    dirstack.popd([])
    assert owd.casefold() == os.getcwd().casefold(), "popd returned cwd to expected dir"
    assert len(_unc_tempDrives) == 0


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_push_other_push_same(xession, shares_setup):
    """push to a, then to b. verify drive letter is TEMP_DRIVE[2], skipping already used TEMP_DRIVE[1]
    Then push to a again. Pop (check b unmapped and a still mapped), pop, pop (check a is unmapped)"""
    if shares_setup is None:
        return
    xession.env.update(dict(CDPATH=PARENT, PWD=HERE))

    dirstack.cd([PARENT])
    owd = os.getcwd()
    assert owd.casefold() == xession.env["PWD"].casefold()
    dirstack.pushd([r"\\localhost\uncpushd_test_HERE"])
    assert os.getcwd().casefold() == TEMP_DRIVE[0] + "\\"
    assert len(_unc_tempDrives) == 1
    assert len(DIRSTACK) == 1

    dirstack.pushd([r"\\localhost\uncpushd_test_PARENT"])
    os.getcwd()
    assert os.getcwd().casefold() == TEMP_DRIVE[2] + "\\"
    assert len(_unc_tempDrives) == 2
    assert len(DIRSTACK) == 2

    dirstack.pushd([r"\\localhost\uncpushd_test_HERE"])
    assert os.getcwd().casefold() == TEMP_DRIVE[0] + "\\"
    assert len(_unc_tempDrives) == 2
    assert len(DIRSTACK) == 3

    dirstack.popd([])
    assert os.getcwd().casefold() == TEMP_DRIVE[2] + "\\"
    assert len(_unc_tempDrives) == 2
    assert len(DIRSTACK) == 2
    assert os.path.isdir(TEMP_DRIVE[2] + "\\")
    assert os.path.isdir(TEMP_DRIVE[0] + "\\")

    dirstack.popd([])
    assert os.getcwd().casefold() == TEMP_DRIVE[0] + "\\"
    assert len(_unc_tempDrives) == 1
    assert len(DIRSTACK) == 1
    assert not os.path.isdir(TEMP_DRIVE[2] + "\\")
    assert os.path.isdir(TEMP_DRIVE[0] + "\\")

    dirstack.popd([])
    assert os.getcwd().casefold() == owd.casefold()
    assert len(_unc_tempDrives) == 0
    assert len(DIRSTACK) == 0
    assert not os.path.isdir(TEMP_DRIVE[2] + "\\")
    assert not os.path.isdir(TEMP_DRIVE[0] + "\\")


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_push_base_push_rempath(xession):
    """push to subdir under share, verify  mapped path includes subdir"""
    pass


@pytest.fixture
def toggle_unc_check():
    old_wval = None

    def _update_key(key_type, value: int):
        import winreg

        old_wval = 0
        with dirstack._win_reg_key(
            key_type,
            r"software\microsoft\command processor",
            access=winreg.KEY_WRITE,
        ) as key:
            try:
                wval, wtype = winreg.QueryValueEx(key, "DisableUNCCheck")
                old_wval = wval  # if values was defined at all
            except OSError:
                pass
            winreg.SetValueEx(key, "DisableUNCCheck", None, winreg.REG_DWORD, value)
        return old_wval

    def update(value: int):
        import winreg

        for key_type in (winreg.HKEY_CURRENT_USER, winreg.HKEY_LOCAL_MACHINE):
            try:
                return _update_key(key_type, value)
            except OSError:
                pass

    def wrapper(value: int):
        nonlocal old_wval
        old_wval = update(value) or 0
        return old_wval

    yield wrapper

    # revert back to old value
    if old_wval is not None:
        update(old_wval)


@pytest.fixture()
def with_unc_check_enabled(toggle_unc_check):
    return toggle_unc_check(1)


@pytest.fixture()
def with_unc_check_disabled(toggle_unc_check):
    return toggle_unc_check(0)


@pytest.fixture()
def xonsh_builtins_cd(xession):
    xession.env["CDPATH"] = PARENT
    xession.env["PWD"] = os.getcwd()
    xession.env["DIRSTACK_SIZE"] = 20
    return xession


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_cd_unc_auto_pushd(xonsh_builtins_cd, with_unc_check_enabled):
    xonsh_builtins_cd.env["AUTO_PUSHD"] = True
    so, se, rc = dirstack.cd([r"\\localhost\uncpushd_test_PARENT"])
    if rc != 0:
        return
    assert os.getcwd().casefold() == TEMP_DRIVE[0] + "\\"
    assert len(DIRSTACK) == 1
    assert os.path.isdir(TEMP_DRIVE[0] + "\\")


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_cd_unc_nocheck(xonsh_builtins_cd, with_unc_check_disabled):
    if with_unc_check_disabled == 0:
        return
    dirstack.cd([r"\\localhost\uncpushd_test_HERE"])
    assert os.getcwd().casefold() == r"\\localhost\uncpushd_test_here"


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_cd_unc_no_auto_pushd(xonsh_builtins_cd, with_unc_check_enabled):
    if with_unc_check_enabled == 0:
        return
    so, se, rc = dirstack.cd([r"\\localhost\uncpushd_test_PARENT"])
    assert rc != 0
    assert so is None or len(so) == 0
    assert "disableunccheck" in se.casefold() and "auto_pushd" in se.casefold()


@pytest.mark.skipif(not ON_WINDOWS, reason="Windows-only UNC functionality")
def test_uncpushd_unc_check():
    # emminently suited to mocking, but I don't know how
    # need to verify unc_check_enabled correct whether values set in HKCU or HKLM
    pass