#!/usr/bin/env python
# -*- coding: UTF-8 -*

# Copyright (c) 2009, Giampaolo Rodola'. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Windows specific tests."""

import errno
import glob
import os
import platform
import signal
import subprocess
import sys
import time

try:
    import win32api  # requires "pip install pypiwin32" / "make setup-dev-env"
    import win32con
    import wmi  # requires "pip install wmi" / "make setup-dev-env"
except ImportError:
    if os.name == 'nt':
        raise

import psutil
from psutil import WINDOWS
from psutil._compat import basestring
from psutil._compat import callable
from psutil._compat import PY3
from psutil.tests import APPVEYOR
from psutil.tests import get_test_subprocess
from psutil.tests import mock
from psutil.tests import reap_children
from psutil.tests import retry_before_failing
from psutil.tests import run_test_module_by_name
from psutil.tests import unittest


cext = psutil._psplatform.cext

# are we a 64 bit process
IS_64_BIT = sys.maxsize > 2**32


def wrap_exceptions(fun):
    def wrapper(self, *args, **kwargs):
        try:
            return fun(self, *args, **kwargs)
        except OSError as err:
            from psutil._pswindows import ACCESS_DENIED_SET
            if err.errno in ACCESS_DENIED_SET:
                raise psutil.AccessDenied(None, None)
            if err.errno == errno.ESRCH:
                raise psutil.NoSuchProcess(None, None)
            raise
    return wrapper


# ===================================================================
# System APIs
# ===================================================================


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class TestSystemAPIs(unittest.TestCase):

    def test_nic_names(self):
        p = subprocess.Popen(['ipconfig', '/all'], stdout=subprocess.PIPE)
        out = p.communicate()[0]
        if PY3:
            out = str(out, sys.stdout.encoding or sys.getfilesystemencoding())
        nics = psutil.net_io_counters(pernic=True).keys()
        for nic in nics:
            if "pseudo-interface" in nic.replace(' ', '-').lower():
                continue
            if nic not in out:
                self.fail(
                    "%r nic wasn't found in 'ipconfig /all' output" % nic)

    @unittest.skipUnless('NUMBER_OF_PROCESSORS' in os.environ,
                         'NUMBER_OF_PROCESSORS env var is not available')
    def test_cpu_count(self):
        num_cpus = int(os.environ['NUMBER_OF_PROCESSORS'])
        self.assertEqual(num_cpus, psutil.cpu_count())

    def test_total_phymem(self):
        w = wmi.WMI().Win32_ComputerSystem()[0]
        self.assertEqual(int(w.TotalPhysicalMemory),
                         psutil.virtual_memory().total)

    # @unittest.skipIf(wmi is None, "wmi module is not installed")
    # def test__UPTIME(self):
    #     # _UPTIME constant is not public but it is used internally
    #     # as value to return for pid 0 creation time.
    #     # WMI behaves the same.
    #     w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
    #     p = psutil.Process(0)
    #     wmic_create = str(w.CreationDate.split('.')[0])
    #     psutil_create = time.strftime("%Y%m%d%H%M%S",
    #                                   time.localtime(p.create_time()))

    # Note: this test is not very reliable
    @unittest.skipIf(APPVEYOR, "test not relieable on appveyor")
    @retry_before_failing()
    def test_pids(self):
        # Note: this test might fail if the OS is starting/killing
        # other processes in the meantime
        w = wmi.WMI().Win32_Process()
        wmi_pids = set([x.ProcessId for x in w])
        psutil_pids = set(psutil.pids())
        self.assertEqual(wmi_pids, psutil_pids)

    @retry_before_failing()
    def test_disks(self):
        ps_parts = psutil.disk_partitions(all=True)
        wmi_parts = wmi.WMI().Win32_LogicalDisk()
        for ps_part in ps_parts:
            for wmi_part in wmi_parts:
                if ps_part.device.replace('\\', '') == wmi_part.DeviceID:
                    if not ps_part.mountpoint:
                        # this is usually a CD-ROM with no disk inserted
                        break
                    try:
                        usage = psutil.disk_usage(ps_part.mountpoint)
                    except OSError as err:
                        if err.errno == errno.ENOENT:
                            # usually this is the floppy
                            break
                        else:
                            raise
                    self.assertEqual(usage.total, int(wmi_part.Size))
                    wmi_free = int(wmi_part.FreeSpace)
                    self.assertEqual(usage.free, wmi_free)
                    # 10 MB tollerance
                    if abs(usage.free - wmi_free) > 10 * 1024 * 1024:
                        self.fail("psutil=%s, wmi=%s" % (
                            usage.free, wmi_free))
                    break
            else:
                self.fail("can't find partition %s" % repr(ps_part))

    def test_net_if_stats(self):
        ps_names = set(cext.net_if_stats())
        wmi_adapters = wmi.WMI().Win32_NetworkAdapter()
        wmi_names = set()
        for wmi_adapter in wmi_adapters:
            wmi_names.add(wmi_adapter.Name)
            wmi_names.add(wmi_adapter.NetConnectionID)
        self.assertTrue(ps_names & wmi_names,
                        "no common entries in %s, %s" % (ps_names, wmi_names))


# ===================================================================
# Process APIs
# ===================================================================


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class TestProcess(unittest.TestCase):

    @classmethod
    def setUpClass(cls):
        cls.pid = get_test_subprocess().pid

    @classmethod
    def tearDownClass(cls):
        reap_children()

    def test_issue_24(self):
        p = psutil.Process(0)
        self.assertRaises(psutil.AccessDenied, p.kill)

    def test_special_pid(self):
        p = psutil.Process(4)
        self.assertEqual(p.name(), 'System')
        # use __str__ to access all common Process properties to check
        # that nothing strange happens
        str(p)
        p.username()
        self.assertTrue(p.create_time() >= 0.0)
        try:
            rss, vms = p.memory_info()[:2]
        except psutil.AccessDenied:
            # expected on Windows Vista and Windows 7
            if not platform.uname()[1] in ('vista', 'win-7', 'win7'):
                raise
        else:
            self.assertTrue(rss > 0)

    def test_send_signal(self):
        p = psutil.Process(self.pid)
        self.assertRaises(ValueError, p.send_signal, signal.SIGINT)

    def test_exe(self):
        for p in psutil.process_iter():
            try:
                self.assertEqual(os.path.basename(p.exe()), p.name())
            except psutil.Error:
                pass

    def test_num_handles(self):
        p = psutil.Process(os.getpid())
        before = p.num_handles()
        handle = win32api.OpenProcess(win32con.PROCESS_QUERY_INFORMATION,
                                      win32con.FALSE, os.getpid())
        after = p.num_handles()
        self.assertEqual(after, before + 1)
        win32api.CloseHandle(handle)
        self.assertEqual(p.num_handles(), before)

    def test_handles_leak(self):
        # Call all Process methods and make sure no handles are left
        # open. This is here mainly to make sure functions using
        # OpenProcess() always call CloseHandle().
        def call(p, attr):
            attr = getattr(p, name, None)
            if attr is not None and callable(attr):
                attr()
            else:
                attr

        p = psutil.Process(self.pid)
        failures = []
        for name in dir(psutil.Process):
            if name.startswith('_') \
                    or name in ('terminate', 'kill', 'suspend', 'resume',
                                'nice', 'send_signal', 'wait', 'children',
                                'as_dict'):
                continue
            else:
                try:
                    call(p, name)
                    num1 = p.num_handles()
                    call(p, name)
                    num2 = p.num_handles()
                except (psutil.NoSuchProcess, psutil.AccessDenied):
                    pass
                else:
                    if num2 > num1:
                        fail = \
                            "failure while processing Process.%s method " \
                            "(before=%s, after=%s)" % (name, num1, num2)
                        failures.append(fail)
        if failures:
            self.fail('\n' + '\n'.join(failures))

    def test_name_always_available(self):
        # On Windows name() is never supposed to raise AccessDenied,
        # see https://github.com/giampaolo/psutil/issues/627
        for p in psutil.process_iter():
            try:
                p.name()
            except psutil.NoSuchProcess:
                pass

    @unittest.skipUnless(sys.version_info >= (2, 7),
                         "CTRL_* signals not supported")
    def test_ctrl_signals(self):
        p = psutil.Process(get_test_subprocess().pid)
        p.send_signal(signal.CTRL_C_EVENT)
        p.send_signal(signal.CTRL_BREAK_EVENT)
        p.kill()
        p.wait()
        self.assertRaises(psutil.NoSuchProcess,
                          p.send_signal, signal.CTRL_C_EVENT)
        self.assertRaises(psutil.NoSuchProcess,
                          p.send_signal, signal.CTRL_BREAK_EVENT)

    def test_compare_name_exe(self):
        for p in psutil.process_iter():
            try:
                a = os.path.basename(p.exe())
                b = p.name()
            except (psutil.NoSuchProcess, psutil.AccessDenied):
                pass
            else:
                self.assertEqual(a, b)


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class TestProcessWMI(unittest.TestCase):
    """Compare Process API results with WMI."""

    @classmethod
    def setUpClass(cls):
        cls.pid = get_test_subprocess().pid

    @classmethod
    def tearDownClass(cls):
        reap_children()

    def test_name(self):
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        self.assertEqual(p.name(), w.Caption)

    def test_exe(self):
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        # Note: wmi reports the exe as a lower case string.
        # Being Windows paths case-insensitive we ignore that.
        self.assertEqual(p.exe().lower(), w.ExecutablePath.lower())

    def test_cmdline(self):
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        self.assertEqual(' '.join(p.cmdline()),
                         w.CommandLine.replace('"', ''))

    def test_username(self):
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        domain, _, username = w.GetOwner()
        username = "%s\\%s" % (domain, username)
        self.assertEqual(p.username(), username)

    def test_memory_rss(self):
        time.sleep(0.1)
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        rss = p.memory_info().rss
        self.assertEqual(rss, int(w.WorkingSetSize))

    def test_memory_vms(self):
        time.sleep(0.1)
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        vms = p.memory_info().vms
        # http://msdn.microsoft.com/en-us/library/aa394372(VS.85).aspx
        # ...claims that PageFileUsage is represented in Kilo
        # bytes but funnily enough on certain platforms bytes are
        # returned instead.
        wmi_usage = int(w.PageFileUsage)
        if (vms != wmi_usage) and (vms != wmi_usage * 1024):
            self.fail("wmi=%s, psutil=%s" % (wmi_usage, vms))

    def test_create_time(self):
        w = wmi.WMI().Win32_Process(ProcessId=self.pid)[0]
        p = psutil.Process(self.pid)
        wmic_create = str(w.CreationDate.split('.')[0])
        psutil_create = time.strftime("%Y%m%d%H%M%S",
                                      time.localtime(p.create_time()))
        self.assertEqual(wmic_create, psutil_create)


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class TestDualProcessImplementation(unittest.TestCase):
    """
    Certain APIs on Windows have 2 internal implementations, one
    based on documented Windows APIs, another one based
    NtQuerySystemInformation() which gets called as fallback in
    case the first fails because of limited permission error.
    Here we test that the two methods return the exact same value,
    see:
    https://github.com/giampaolo/psutil/issues/304
    """

    @classmethod
    def setUpClass(cls):
        cls.pid = get_test_subprocess().pid

    @classmethod
    def tearDownClass(cls):
        reap_children()
    # ---
    # same tests as above but mimicks the AccessDenied failure of
    # the first (fast) method failing with AD.

    def test_name(self):
        name = psutil.Process(self.pid).name()
        with mock.patch("psutil._psplatform.cext.proc_exe",
                        side_effect=psutil.AccessDenied(os.getpid())) as fun:
            self.assertEqual(psutil.Process(self.pid).name(), name)
            assert fun.called

    def test_memory_info(self):
        mem_1 = psutil.Process(self.pid).memory_info()
        with mock.patch("psutil._psplatform.cext.proc_memory_info",
                        side_effect=OSError(errno.EPERM, "msg")) as fun:
            mem_2 = psutil.Process(self.pid).memory_info()
            self.assertEqual(len(mem_1), len(mem_2))
            for i in range(len(mem_1)):
                self.assertGreaterEqual(mem_1[i], 0)
                self.assertGreaterEqual(mem_2[i], 0)
                self.assertAlmostEqual(mem_1[i], mem_2[i], delta=512)
            assert fun.called

    def test_create_time(self):
        ctime = psutil.Process(self.pid).create_time()
        with mock.patch("psutil._psplatform.cext.proc_create_time",
                        side_effect=OSError(errno.EPERM, "msg")) as fun:
            self.assertEqual(psutil.Process(self.pid).create_time(), ctime)
            assert fun.called

    def test_cpu_times(self):
        cpu_times_1 = psutil.Process(self.pid).cpu_times()
        with mock.patch("psutil._psplatform.cext.proc_cpu_times",
                        side_effect=OSError(errno.EPERM, "msg")) as fun:
            cpu_times_2 = psutil.Process(self.pid).cpu_times()
            assert fun.called
            self.assertAlmostEqual(
                cpu_times_1.user, cpu_times_2.user, delta=0.01)
            self.assertAlmostEqual(
                cpu_times_1.system, cpu_times_2.system, delta=0.01)

    def test_io_counters(self):
        io_counters_1 = psutil.Process(self.pid).io_counters()
        print("")
        print(io_counters_1)
        with mock.patch("psutil._psplatform.cext.proc_io_counters",
                        side_effect=OSError(errno.EPERM, "msg")) as fun:
            io_counters_2 = psutil.Process(self.pid).io_counters()
            for i in range(len(io_counters_1)):
                self.assertGreaterEqual(io_counters_1[i], 0)
                self.assertGreaterEqual(io_counters_2[i], 0)
                self.assertAlmostEqual(
                    io_counters_1[i], io_counters_2[i], delta=5)
            assert fun.called

    def test_num_handles(self):
        num_handles = psutil.Process(self.pid).num_handles()
        with mock.patch("psutil._psplatform.cext.proc_num_handles",
                        side_effect=OSError(errno.EPERM, "msg")) as fun:
            psutil.Process(self.pid).num_handles() == num_handles
            assert fun.called


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class RemoteProcessTestCase(unittest.TestCase):
    """Certain functions require calling ReadProcessMemory.
    This trivially works when called on the current process.
    Check that this works on other processes, especially when they
    have a different bitness.
    """

    @staticmethod
    def find_other_interpreter():
        # find a python interpreter that is of the opposite bitness from us
        code = "import sys; sys.stdout.write(str(sys.maxsize > 2**32))"

        # XXX: a different and probably more stable approach might be to access
        # the registry but accessing 64 bit paths from a 32 bit process
        for filename in glob.glob(r"C:\Python*\python.exe"):
            proc = subprocess.Popen(args=[filename, "-c", code],
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.STDOUT)
            output, _ = proc.communicate()
            if output == str(not IS_64_BIT):
                return filename

    @classmethod
    def setUpClass(cls):
        other_python = cls.find_other_interpreter()

        if other_python is None:
            raise unittest.SkipTest(
                "could not find interpreter with opposite bitness")

        if IS_64_BIT:
            cls.python64 = sys.executable
            cls.python32 = other_python
        else:
            cls.python64 = other_python
            cls.python32 = sys.executable

    test_args = ["-c", "import sys; sys.stdin.read()"]

    def setUp(self):
        env = os.environ.copy()
        env["THINK_OF_A_NUMBER"] = str(os.getpid())
        self.proc32 = get_test_subprocess([self.python32] + self.test_args,
                                          env=env,
                                          stdin=subprocess.PIPE)
        self.proc64 = get_test_subprocess([self.python64] + self.test_args,
                                          env=env,
                                          stdin=subprocess.PIPE)

    def tearDown(self):
        self.proc32.communicate()
        self.proc64.communicate()
        reap_children()

    @classmethod
    def tearDownClass(cls):
        reap_children()

    def test_cmdline_32(self):
        p = psutil.Process(self.proc32.pid)
        self.assertEqual(len(p.cmdline()), 3)
        self.assertEqual(p.cmdline()[1:], self.test_args)

    def test_cmdline_64(self):
        p = psutil.Process(self.proc64.pid)
        self.assertEqual(len(p.cmdline()), 3)
        self.assertEqual(p.cmdline()[1:], self.test_args)

    def test_cwd_32(self):
        p = psutil.Process(self.proc32.pid)
        self.assertEqual(p.cwd(), os.getcwd())

    def test_cwd_64(self):
        p = psutil.Process(self.proc64.pid)
        self.assertEqual(p.cwd(), os.getcwd())

    def test_environ_32(self):
        p = psutil.Process(self.proc32.pid)
        e = p.environ()
        self.assertIn("THINK_OF_A_NUMBER", e)
        self.assertEquals(e["THINK_OF_A_NUMBER"], str(os.getpid()))

    def test_environ_64(self):
        p = psutil.Process(self.proc64.pid)
        e = p.environ()
        self.assertIn("THINK_OF_A_NUMBER", e)
        self.assertEquals(e["THINK_OF_A_NUMBER"], str(os.getpid()))


# ===================================================================
# Windows services
# ===================================================================


@unittest.skipUnless(WINDOWS, "WINDOWS only")
class TestServices(unittest.TestCase):

    def test_win_service_iter(self):
        valid_statuses = set([
            "running",
            "paused",
            "start",
            "pause",
            "continue",
            "stop",
            "stopped",
        ])
        valid_start_types = set([
            "automatic",
            "manual",
            "disabled",
        ])
        valid_statuses = set([
            "running",
            "paused",
            "start_pending",
            "pause_pending",
            "continue_pending",
            "stop_pending",
            "stopped"
        ])
        for serv in psutil.win_service_iter():
            data = serv.as_dict()
            self.assertIsInstance(data['name'], basestring)
            self.assertNotEqual(data['name'].strip(), "")
            self.assertIsInstance(data['display_name'], basestring)
            self.assertIsInstance(data['username'], basestring)
            self.assertIn(data['status'], valid_statuses)
            if data['pid'] is not None:
                psutil.Process(data['pid'])
            self.assertIsInstance(data['binpath'], basestring)
            self.assertIsInstance(data['username'], basestring)
            self.assertIsInstance(data['start_type'], basestring)
            self.assertIn(data['start_type'], valid_start_types)
            self.assertIn(data['status'], valid_statuses)
            self.assertIsInstance(data['description'], basestring)
            pid = serv.pid()
            if pid is not None:
                p = psutil.Process(pid)
                self.assertTrue(p.is_running())
            # win_service_get
            s = psutil.win_service_get(serv.name())
            # test __eq__
            self.assertEqual(serv, s)

    def test_win_service_get(self):
        name = next(psutil.win_service_iter()).name()

        with self.assertRaises(psutil.NoSuchProcess) as cm:
            psutil.win_service_get(name + '???')
        self.assertEqual(cm.exception.name, name + '???')

        # test NoSuchProcess
        service = psutil.win_service_get(name)
        exc = WindowsError(
            psutil._psplatform.cext.ERROR_SERVICE_DOES_NOT_EXIST, "")
        with mock.patch("psutil._psplatform.cext.winservice_query_status",
                        side_effect=exc):
            self.assertRaises(psutil.NoSuchProcess, service.status)
        with mock.patch("psutil._psplatform.cext.winservice_query_config",
                        side_effect=exc):
            self.assertRaises(psutil.NoSuchProcess, service.username)

        # test AccessDenied
        exc = WindowsError(
            psutil._psplatform.cext.ERROR_ACCESS_DENIED, "")
        with mock.patch("psutil._psplatform.cext.winservice_query_status",
                        side_effect=exc):
            self.assertRaises(psutil.AccessDenied, service.status)
        with mock.patch("psutil._psplatform.cext.winservice_query_config",
                        side_effect=exc):
            self.assertRaises(psutil.AccessDenied, service.username)

        # test __str__ and __repr__
        self.assertIn(service.name(), str(service))
        self.assertIn(service.display_name(), str(service))
        self.assertIn(service.name(), repr(service))
        self.assertIn(service.display_name(), repr(service))


if __name__ == '__main__':
    run_test_module_by_name(__file__)