# Copyright 2013: Mirantis Inc.
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

"""Test for Rally utils."""

from __future__ import print_function
import string
import sys
import time

import mock
import testtools

from rally.common.i18n import _
from rally.common import utils
from rally import exceptions
from tests.unit import test


class ImmutableMixinTestCase(test.TestCase):

    def test_without_base_values(self):
        im = utils.ImmutableMixin()
        self.assertRaises(exceptions.ImmutableException,
                          im.__setattr__, 'test', 'test')

    def test_with_base_values(self):

        class A(utils.ImmutableMixin):
            def __init__(self, test):
                self.test = test
                super(A, self).__init__()

        a = A('test')
        self.assertRaises(exceptions.ImmutableException,
                          a.__setattr__, 'abc', 'test')
        self.assertEqual(a.test, 'test')


class EnumMixinTestCase(test.TestCase):

    def test_enum_mix_in(self):

        class Foo(utils.EnumMixin):
            a = 10
            b = 20
            CC = "2000"

        self.assertEqual(set(list(Foo())), set([10, 20, "2000"]))


class StdIOCaptureTestCase(test.TestCase):

    def test_stdout_capture(self):
        stdout = sys.stdout
        messages = ['abcdef', 'defgaga']
        with utils.StdOutCapture() as out:
            for msg in messages:
                print(msg)

        self.assertEqual(out.getvalue().rstrip('\n').split('\n'), messages)
        self.assertEqual(stdout, sys.stdout)

    def test_stderr_capture(self):
        stderr = sys.stderr
        messages = ['abcdef', 'defgaga']
        with utils.StdErrCapture() as err:
            for msg in messages:
                print(msg, file=sys.stderr)

        self.assertEqual(err.getvalue().rstrip('\n').split('\n'), messages)
        self.assertEqual(stderr, sys.stderr)


class TimerTestCase(test.TestCase):

    def test_timer_duration(self):
        start_time = time.time()
        end_time = time.time()

        with mock.patch('rally.common.utils.time') as mock_time:
            mock_time.time = mock.MagicMock(return_value=start_time)
            with utils.Timer() as timer:
                mock_time.time = mock.MagicMock(return_value=end_time)

        self.assertIsNone(timer.error)
        self.assertEqual(end_time - start_time, timer.duration())

    def test_timer_exception(self):
        try:
            with utils.Timer() as timer:
                raise Exception()
        except Exception:
            pass
        self.assertEqual(3, len(timer.error))
        self.assertEqual(timer.error[0], type(Exception()))


class IterSubclassesTestCase(test.TestCase):

    def test_itersubclasses(self):
        class A(object):
            pass

        class B(A):
            pass

        class C(A):
            pass

        class D(C):
            pass

        self.assertEqual([B, C, D], list(utils.itersubclasses(A)))


class ImportModulesTestCase(test.TestCase):
    def test_try_append_module_into_sys_modules(self):
        modules = {}
        utils.try_append_module('rally.common.version', modules)
        self.assertIn('rally.common.version', modules)

    def test_try_append_broken_module(self):
        modules = {}
        self.assertRaises(ImportError,
                          utils.try_append_module,
                          'tests.unit.fixtures.import.broken',
                          modules)

    def test_import_modules_from_package(self):
        utils.import_modules_from_package('tests.unit.fixtures.import.package')
        self.assertIn('tests.unit.fixtures.import.package.a', sys.modules)
        self.assertIn('tests.unit.fixtures.import.package.b', sys.modules)


class LogTestCase(test.TestCase):

    def test_log_task_wrapper(self):
        mock_log = mock.MagicMock()
        msg = "test %(a)s %(b)s"

        class TaskLog(object):

            def __init__(self):
                self.task = {'uuid': 'some_uuid'}

            @utils.log_task_wrapper(mock_log, msg, a=10, b=20)
            def some_method(self, x, y):
                return x + y

        t = TaskLog()
        self.assertEqual(t.some_method.__name__, "some_method")
        self.assertEqual(t.some_method(2, 2), 4)
        params = {'msg': msg % {'a': 10, 'b': 20}, 'uuid': t.task['uuid']}
        expected = [
            mock.call(_("Task %(uuid)s | Starting:  %(msg)s") % params),
            mock.call(_("Task %(uuid)s | Completed: %(msg)s") % params)
        ]
        self.assertEqual(mock_log.mock_calls, expected)


class LoadExtraModulesTestCase(test.TestCase):

    @mock.patch("rally.common.utils.imp.load_module")
    @mock.patch("rally.common.utils.imp.find_module",
                return_value=(mock.MagicMock(), None, None))
    @mock.patch("rally.common.utils.os.walk", return_value=[
        ('/somewhere', ('/subdir', ), ('plugin1.py', )),
        ('/somewhere/subdir', ('/subsubdir', ), ('plugin2.py',
                                                 'withoutextension')),
        ('/somewhere/subdir/subsubdir', [], ('plugin3.py', ))])
    @mock.patch("rally.common.utils.os.path.exists", return_value=True)
    def test_load_plugins_successfull(self, mock_exists,
                                      mock_oswalk, mock_find_module,
                                      mock_load_module):
        test_path = "/somewhere"
        utils.load_plugins(test_path)
        expected = [
            mock.call("plugin1", ["/somewhere"]),
            mock.call("plugin2", ["/somewhere/subdir"]),
            mock.call("plugin3", ["/somewhere/subdir/subsubdir"])
        ]
        self.assertEqual(mock_find_module.mock_calls, expected)
        self.assertEqual(len(mock_load_module.mock_calls), 3)

    @mock.patch("rally.common.utils.os")
    def test_load_plugins_from_nonexisting_and_empty_dir(self, mock_os):
        # test no fails for nonexisting directory
        mock_os.path.exists.return_value = False
        utils.load_plugins("/somewhere")
        # test no fails for empty directory
        mock_os.path.exists.return_value = True
        mock_os.walk.return_value = []
        utils.load_plugins("/somewhere")

    @mock.patch("rally.common.utils.imp.load_module", side_effect=Exception())
    @mock.patch("rally.common.utils.imp.find_module")
    @mock.patch("rally.common.utils.os.path", return_value=True)
    @mock.patch("rally.common.utils.os.walk",
                return_value=[('/etc/.rally/plugins', [], ('load_it.py', ))])
    def test_load_plugins_fails(self, mock_oswalk, mock_ospath,
                                mock_load_module, mock_find_module):
        # test no fails if module is broken
        # TODO(olkonami): check exception is handled correct
        utils.load_plugins("/somwhere")


def module_level_method():
    pass


class MethodClassTestCase(test.TestCase):

    @testtools.skipIf(sys.version_info > (2, 9), "Problems with access to "
                                                 "class from <locals>")
    def test_method_class_for_class_level_method(self):
        class A:
            def m(self):
                pass
        self.assertEqual(A, utils.get_method_class(A.m))

    def test_method_class_for_module_level_method(self):
        self.assertIsNone(utils.get_method_class(module_level_method))


class FirstIndexTestCase(test.TestCase):

    def test_list_with_existing_matching_element(self):
        lst = [1, 3, 5, 7]
        self.assertEqual(utils.first_index(lst, lambda e: e == 1), 0)
        self.assertEqual(utils.first_index(lst, lambda e: e == 5), 2)
        self.assertEqual(utils.first_index(lst, lambda e: e == 7), 3)

    def test_list_with_non_existing_matching_element(self):
        lst = [1, 3, 5, 7]
        self.assertIsNone(utils.first_index(lst, lambda e: e == 2))


class DocstringTestCase(test.TestCase):

    def test_parse_complete_docstring(self):
        docstring = """One-line description.

Multi-
line-
description.

:param p1: Param 1 description.
:param p2: Param 2
           description.
:returns: Return value
          description.
"""

        dct = utils.parse_docstring(docstring)
        expected = {
            "short_description": "One-line description.",
            "long_description": "Multi-\nline-\ndescription.",
            "params": [{"name": "p1", "doc": "Param 1 description."},
                       {"name": "p2", "doc": "Param 2 description."}],
            "returns": "Return value description."
        }
        self.assertEqual(dct, expected)

    def test_parse_incomplete_docstring(self):
        docstring = """One-line description.

:param p1: Param 1 description.
:param p2: Param 2
           description.
"""

        dct = utils.parse_docstring(docstring)
        expected = {
            "short_description": "One-line description.",
            "long_description": None,
            "params": [{"name": "p1", "doc": "Param 1 description."},
                       {"name": "p2", "doc": "Param 2 description."}],
            "returns": None
        }
        self.assertEqual(dct, expected)

    def test_parse_docstring_with_no_params(self):
        docstring = """One-line description.

Multi-
line-
description.

:returns: Return value
          description.
"""

        dct = utils.parse_docstring(docstring)
        expected = {
            "short_description": "One-line description.",
            "long_description": "Multi-\nline-\ndescription.",
            "params": [],
            "returns": "Return value description."
        }
        self.assertEqual(dct, expected)


class EditDistanceTestCase(test.TestCase):

    def test_distance_empty_strings(self):
        dist = utils.distance("", "")
        self.assertEqual(0, dist)

    def test_distance_equal_strings(self):
        dist = utils.distance("abcde", "abcde")
        self.assertEqual(0, dist)

    def test_distance_replacement(self):
        dist = utils.distance("abcde", "__cde")
        self.assertEqual(2, dist)

    def test_distance_insertion(self):
        dist = utils.distance("abcde", "ab__cde")
        self.assertEqual(2, dist)

    def test_distance_deletion(self):
        dist = utils.distance("abcde", "abc")
        self.assertEqual(2, dist)


class TenantIteratorTestCase(test.TestCase):

    def test_iterate_per_tenant(self):
        users = list()
        tenants_count = 2
        users_per_tenant = 5
        for tenant_id in range(tenants_count):
            for user_id in range(users_per_tenant):
                users.append({"id": str(user_id),
                              "tenant_id": str(tenant_id)})

        expected_result = [
            ({"id": "0", "tenant_id": str(i)}, str(i)) for i in range(
                tenants_count)]
        real_result = [i for i in utils.iterate_per_tenants(users)]

        self.assertEqual(expected_result, real_result)


class RAMIntTestCase(test.TestCase):

    @mock.patch("rally.common.utils.multiprocessing")
    def test__init__(self, mock_multi):
        utils.RAMInt()
        mock_multi.Lock.assert_called_once_with()
        mock_multi.Value.assert_called_once_with("I", 0)

    @mock.patch("rally.common.utils.multiprocessing")
    def test__int__(self, mock_multi):
        mock_multi.Value.return_value = mock.Mock(value=42)
        self.assertEqual(int(utils.RAMInt()), 42)

    @mock.patch("rally.common.utils.multiprocessing")
    def test__str__(self, mock_multi):
        mock_multi.Value.return_value = mock.Mock(value=42)
        self.assertEqual(str(utils.RAMInt()), "42")

    @mock.patch("rally.common.utils.multiprocessing")
    def test__iter__(self, mock_multi):
        ram_int = utils.RAMInt()
        self.assertEqual(iter(ram_int), ram_int)

    @mock.patch("rally.common.utils.multiprocessing")
    def test__next__(self, mock_multi):
        class MemInt(int):
            THRESHOLD = 5

            def __iadd__(self, i):
                return MemInt((int(self) + i) % self.THRESHOLD)

        mock_lock = mock.MagicMock()
        mock_multi.Lock.return_value = mock_lock
        mock_multi.Value.return_value = mock.Mock(value=MemInt(0))

        ram_int = utils.RAMInt()
        self.assertEqual(int(ram_int), 0)
        for i in range(MemInt.THRESHOLD - 1):
            self.assertEqual(ram_int.__next__(), i)
        self.assertRaises(StopIteration, ram_int.__next__)
        self.assertEqual(mock_lock.__enter__.mock_calls,
                         [mock.call()] * MemInt.THRESHOLD)
        self.assertEqual(len(mock_lock.__exit__.mock_calls), MemInt.THRESHOLD)

    @mock.patch("rally.common.utils.RAMInt.__next__",
                return_value="next_value")
    @mock.patch("rally.common.utils.multiprocessing")
    def test_next(self, mock_multi, mock_next):
        self.assertEqual(next(utils.RAMInt()), "next_value")
        mock_next.assert_called_once_with()

    @mock.patch("rally.common.utils.multiprocessing")
    def test_reset(self, mock_multi):
        ram_int = utils.RAMInt()
        self.assertRaises(TypeError, int, ram_int)
        ram_int.reset()
        self.assertEqual(int(ram_int), 0)


class GenerateRandomTestCase(test.TestCase):

    @mock.patch("rally.common.utils.random")
    def test_generate_random_name(self, mock_random):
        choice = "foobarspamchoicestring"

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(utils.generate_random_name(),
                         string.ascii_lowercase[:16])

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(utils.generate_random_name(length=10),
                         string.ascii_lowercase[:10])

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(utils.generate_random_name(choice=choice),
                         choice[:16])

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(utils.generate_random_name(choice=choice, length=5),
                         choice[:5])

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(
            utils.generate_random_name(prefix="foo_", length=10),
            "foo_" + string.ascii_lowercase[:10])

        idx = iter(range(100))
        mock_random.choice.side_effect = lambda choice: choice[next(idx)]
        self.assertEqual(
            utils.generate_random_name(prefix="foo_",
                                       choice=choice, length=10),
            "foo_" + choice[:10])