# Copyright (C) 2011 Google Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met:
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#    * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
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# in the documentation and/or other materials provided with the
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# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
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import platform
import sys
import unittest

from blinkpy.common.system.executive import Executive
from blinkpy.common.system.executive_mock import MockExecutive
from blinkpy.common.system.filesystem import FileSystem
from blinkpy.common.system.filesystem_mock import MockFileSystem
from blinkpy.common.system.platform_info import PlatformInfo


def fake_sys(platform_str='darwin', windows_version_tuple=None):
    class FakeSysModule(object):
        platform = platform_str
        if windows_version_tuple:
            getwindowsversion = lambda x: windows_version_tuple

    return FakeSysModule()


def fake_platform(mac_version_string='10.12.3',
                  release_string='bar',
                  linux_version='trusty',
                  win_version_string=None):
    class FakePlatformModule(object):
        def mac_ver(self):
            return tuple([mac_version_string, tuple(['', '', '']), 'i386'])

        def linux_distribution(self):
            return tuple([None, None, linux_version])

        def platform(self):
            return 'foo'

        def release(self):
            return release_string

        def win32_ver(self):
            return tuple([None, win_version_string])

    return FakePlatformModule()


def fake_executive(output=None):
    if output:
        return MockExecutive(output=output)
    return MockExecutive(exception=SystemError)


class TestPlatformInfo(unittest.TestCase):
    def make_info(self,
                  sys_module=None,
                  platform_module=None,
                  filesystem_module=None,
                  executive=None):
        return PlatformInfo(sys_module or fake_sys(), platform_module
                            or fake_platform(), filesystem_module
                            or MockFileSystem(), executive or fake_executive())

    def test_real_code(self):
        # This test makes sure the real (unmocked) code actually works.
        info = PlatformInfo(sys, platform, FileSystem(), Executive())
        self.assertNotEquals(info.os_name, '')
        self.assertNotEquals(info.os_version, '')
        self.assertNotEquals(info.display_name(), '')
        self.assertTrue(info.is_mac() or info.is_win() or info.is_linux()
                        or info.is_freebsd())
        self.assertIsNotNone(info.terminal_width())

        if info.is_linux():
            self.assertIsNotNone(info.linux_distribution())

        if info.is_mac():
            self.assertTrue(info.total_bytes_memory() > 0)
        else:
            self.assertIsNone(info.total_bytes_memory())

    def test_os_name_and_wrappers(self):
        info = self.make_info(fake_sys('linux2'))
        self.assertTrue(info.is_linux())
        self.assertFalse(info.is_mac())
        self.assertFalse(info.is_win())
        self.assertFalse(info.is_freebsd())

        info = self.make_info(fake_sys('linux3'))
        self.assertTrue(info.is_linux())
        self.assertFalse(info.is_mac())
        self.assertFalse(info.is_win())
        self.assertFalse(info.is_freebsd())

        info = self.make_info(fake_sys('darwin'), fake_platform('10.12.3'))
        self.assertEqual(info.os_name, 'mac')
        self.assertFalse(info.is_linux())
        self.assertTrue(info.is_mac())
        self.assertFalse(info.is_win())
        self.assertFalse(info.is_freebsd())

        info = self.make_info(fake_sys('win32', tuple([6, 1, 7600])),
                              fake_platform(win_version_string="6.1.7600"))
        self.assertEqual(info.os_name, 'win')
        self.assertFalse(info.is_linux())
        self.assertFalse(info.is_mac())
        self.assertTrue(info.is_win())
        self.assertFalse(info.is_freebsd())

        info = self.make_info(fake_sys('freebsd8'))
        self.assertEqual(info.os_name, 'freebsd')
        self.assertFalse(info.is_linux())
        self.assertFalse(info.is_mac())
        self.assertFalse(info.is_win())
        self.assertTrue(info.is_freebsd())

        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('vms'))

    def test_os_version(self):
        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('darwin'), fake_platform('10.6.3'))
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.10.0')).os_version, 'mac10.10')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.11.0')).os_version, 'mac10.11')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.12.0')).os_version, 'mac10.12')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.13.0')).os_version, 'mac10.13')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.14.0')).os_version, 'mac10.14')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.15.0')).os_version, 'mac10.15')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('10.16.0')).os_version, 'mac10.16')
        self.assertEqual(
            self.make_info(fake_sys('darwin'),
                           fake_platform('11.0.0')).os_version, 'mac11.0')
        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('darwin'), fake_platform('10.20.0'))

        self.assertEqual(
            self.make_info(fake_sys('linux2')).os_version, 'trusty')
        info = self.make_info(
            fake_sys('linux2'), fake_platform(linux_version='utopic'))
        self.assertEqual(info.os_version, 'trusty')

        self.assertEqual(
            self.make_info(
                fake_sys('freebsd8'), fake_platform(
                    '', '8.3-PRERELEASE')).os_version, '8.3-PRERELEASE')
        self.assertEqual(
            self.make_info(
                fake_sys('freebsd9'),
                fake_platform('', '9.0-RELEASE')).os_version, '9.0-RELEASE')

        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('win32', tuple([5, 0, 1234])),
                           fake_platform(win_version_string="5.0.1234"))
        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('win32', tuple([6, 1, 1234])),
                           fake_platform(win_version_string="6.1.1234"))
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([10, 1, 1234])),
                fake_platform(win_version_string="10.1.1234")).os_version,
            'future')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([10, 0, 1234])),
                fake_platform(win_version_string="10.0.1234")).os_version,
            '10.1909')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([10, 0, 19042])),
                fake_platform(win_version_string="10.0.19042")).os_version,
            '10.20h2')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([6, 3, 1234])),
                fake_platform(win_version_string="6.3.1234")).os_version,
            '8.1')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([6, 2, 1234])),
                fake_platform(win_version_string="6.2.1234")).os_version, '8')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([6, 1, 7601])),
                fake_platform(win_version_string="6.1.7601")).os_version,
            '7sp1')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([6, 1, 7600])),
                fake_platform(win_version_string="6.1.7600")).os_version,
            '7sp0')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([6, 0, 1234])),
                fake_platform(win_version_string="6.0.1234")).os_version,
            'vista')
        self.assertEqual(
            self.make_info(
                fake_sys('win32', tuple([5, 1, 1234])),
                fake_platform(win_version_string="5.1.1234")).os_version, 'xp')

        with self.assertRaises(AssertionError):
            self.make_info(
                fake_sys('win32'), executive=fake_executive('5.0.1234'))
        with self.assertRaises(AssertionError):
            self.make_info(
                fake_sys('win32'), executive=fake_executive('6.1.1234'))

    def _assert_files_imply_linux_distribution(self, file_paths, distribution):
        fs_module = MockFileSystem({file_path: '' for file_path in file_paths})
        info = self.make_info(
            sys_module=fake_sys('linux2'), filesystem_module=fs_module)
        self.assertEqual(info.linux_distribution(), distribution)

    def test_linux_distro_detection(self):
        self._assert_files_imply_linux_distribution(['/etc/arch-release'],
                                                    'arch')
        self._assert_files_imply_linux_distribution(['/etc/debian_version'],
                                                    'debian')
        self._assert_files_imply_linux_distribution(['/etc/fedora-release'],
                                                    'fedora')
        self._assert_files_imply_linux_distribution(
            ['/etc/fedora-release', '/etc/redhat-release'], 'fedora')
        self._assert_files_imply_linux_distribution(['/etc/redhat-release'],
                                                    'redhat')
        self._assert_files_imply_linux_distribution(['/etc/mock-release'],
                                                    'unknown')

    def test_display_name(self):
        info = self.make_info(fake_sys('darwin'))
        self.assertNotEquals(info.display_name(), '')

        info = self.make_info(fake_sys('win32', tuple([6, 1, 7600])),
                              fake_platform(win_version_string="6.1.7600"))
        self.assertNotEquals(info.display_name(), '')

        info = self.make_info(fake_sys('linux2'))
        self.assertNotEquals(info.display_name(), '')

        info = self.make_info(fake_sys('freebsd9'))
        self.assertNotEquals(info.display_name(), '')

    def test_total_bytes_memory(self):
        info = self.make_info(
            fake_sys('darwin'),
            fake_platform('10.12.3'),
            executive=fake_executive('1234'))
        self.assertEqual(info.total_bytes_memory(), 1234)

        info = self.make_info(fake_sys('win32', tuple([6, 1, 7600])),
                              fake_platform(win_version_string="6.1.7600"))
        self.assertIsNone(info.total_bytes_memory())

        info = self.make_info(fake_sys('linux2'))
        self.assertIsNone(info.total_bytes_memory())

        info = self.make_info(fake_sys('freebsd9'))
        self.assertIsNone(info.total_bytes_memory())

    def test_unsupported_platform(self):
        with self.assertRaises(AssertionError):
            self.make_info(fake_sys('cygwin'))
