try:
    from builtins import object
except ImportError:
    pass

from functools import partial

from transitions.extensions.markup import MarkupMachine, HierarchicalMarkupMachine, rep

from .test_core import TYPE_CHECKING
from .utils import Stuff

from unittest import TestCase, skipIf

try:
    from unittest.mock import MagicMock
except ImportError:
    from mock import MagicMock  # type: ignore

try:
    import enum
    from enum import Enum
except ImportError:
    enum = None  # type: ignore

    # placeholder for Python < 3.4 without enum
    class Enum:  # type: ignore
        pass

if TYPE_CHECKING:
    from typing import List, Dict, Sequence, Union, Type
    from transitions.core import TransitionConfig, StateConfig


class SimpleModel(object):

    def after_func(self):
        pass


class TestRep(TestCase):

    def test_rep_string(self):
        self.assertEqual(rep("string"), "string")

    def test_rep_function(self):
        def check():
            return True
        self.assertTrue(check())
        self.assertEqual(rep(check, MarkupMachine.format_references), "check")

    def test_rep_partial_no_args_no_kwargs(self):
        def check():
            return True
        pcheck = partial(check)
        self.assertTrue(pcheck())
        self.assertEqual(rep(pcheck, MarkupMachine.format_references), "check()")

    def test_rep_partial_with_args(self):
        def check(result):
            return result
        pcheck = partial(check, True)
        self.assertTrue(pcheck())
        self.assertEqual(rep(pcheck, MarkupMachine.format_references), "check(True)")

    def test_rep_partial_with_kwargs(self):
        def check(result=True):
            return result
        pcheck = partial(check, result=True)
        self.assertTrue(pcheck())
        self.assertEqual(rep(pcheck, MarkupMachine.format_references), "check(result=True)")

    def test_rep_partial_with_args_and_kwargs(self):
        def check(result, doublecheck=True):
            return result == doublecheck
        pcheck = partial(check, True, doublecheck=True)
        self.assertTrue(pcheck())
        self.assertEqual(rep(pcheck, MarkupMachine.format_references), "check(True, doublecheck=True)")

    def test_rep_callable_class(self):
        class Check(object):
            def __init__(self, result):
                self.result = result

            def __call__(self):
                return self.result

            def __repr__(self):
                return "%s(%r)" % (type(self).__name__, self.result)

        ccheck = Check(True)
        self.assertTrue(ccheck())
        self.assertEqual(rep(ccheck, MarkupMachine.format_references), "Check(True)")


class TestMarkupMachine(TestCase):

    def setUp(self):
        self.machine_cls = MarkupMachine
        self.states = ['A', 'B', 'C', 'D']  # type: Union[Sequence[StateConfig], Type[Enum]]
        self.transitions = [
            {'trigger': 'walk', 'source': 'A', 'dest': 'B'},
            {'trigger': 'run', 'source': 'B', 'dest': 'C'},
            {'trigger': 'sprint', 'source': 'C', 'dest': 'D'}
        ]  # type: Sequence[TransitionConfig]
        self.num_trans = len(self.transitions)
        self.num_auto = len(self.states) ** 2

    def test_markup_self(self):
        m1 = self.machine_cls(states=self.states, transitions=self.transitions, initial='A')
        m1.walk()
        m2 = self.machine_cls(markup=m1.markup)
        self.assertTrue(m1.state == m2.state or m1.state.name == m2.state)
        self.assertEqual(len(m1.models), len(m2.models))
        self.assertEqual(sorted(m1.states.keys()), sorted(m2.states.keys()))
        self.assertEqual(sorted(m1.events.keys()), sorted(m2.events.keys()))
        m2.run()
        m2.sprint()
        self.assertNotEqual(m1.state, m2.state)

    def test_markup_model(self):
        model1 = SimpleModel()
        m1 = self.machine_cls(model1, states=self.states, transitions=self.transitions, initial='A')
        model1.walk()
        m2 = self.machine_cls(markup=m1.markup)
        model2 = m2.models[0]
        self.assertIsInstance(model2, SimpleModel)
        self.assertEqual(len(m1.models), len(m2.models))
        self.assertTrue(model1.state == model2.state or model1.state.name == model2.state)
        self.assertEqual(sorted(m1.states.keys()), sorted(m2.states.keys()))
        self.assertEqual(sorted(m1.events.keys()), sorted(m2.events.keys()))

    def test_conditions_unless(self):
        s = Stuff(machine_cls=self.machine_cls)
        s.machine.add_transition('go', 'A', 'B', conditions='this_passes',
                                 unless=['this_fails', 'this_fails_by_default'])
        t = s.machine.markup['transitions']
        self.assertEqual(len(t), 1)
        self.assertEqual(t[0]['trigger'], 'go')
        self.assertEqual(len(t[0]['conditions']), 1)
        self.assertEqual(len(t[0]['unless']), 2)

    def test_auto_transitions(self):
        m1 = self.machine_cls(states=self.states, transitions=self.transitions, initial='A')
        m2 = self.machine_cls(states=self.states, transitions=self.transitions, initial='A',
                              auto_transitions_markup=True)

        self.assertEqual(len(m1.markup['transitions']), self.num_trans)
        self.assertEqual(len(m2.markup['transitions']), self.num_trans + self.num_auto)
        m1.add_transition('go', 'A', 'B')
        m2.add_transition('go', 'A', 'B')
        self.num_trans += 1
        self.assertEqual(len(m1.markup['transitions']), self.num_trans)
        self.assertEqual(len(m2.markup['transitions']), self.num_trans + self.num_auto)
        m1.auto_transitions_markup = True
        m2.auto_transitions_markup = False
        self.assertEqual(len(m1.markup['transitions']), self.num_trans + self.num_auto)
        self.assertEqual(len(m2.markup['transitions']), self.num_trans)


class TestMarkupHierarchicalMachine(TestMarkupMachine):

    def setUp(self):
        self.states = ['A', 'B', {'name': 'C',
                                  'children': ['1', '2', {'name': '3', 'children': ['a', 'b', 'c']}]}]

        self.transitions = [
            {'trigger': 'walk', 'source': 'A', 'dest': 'C_1'},
            {'trigger': 'run', 'source': 'C_1', 'dest': 'C_3_a'},
            {'trigger': 'sprint', 'source': 'C', 'dest': 'B'}
        ]

        # MarkupMachine cannot be imported via get_predefined as of now
        # We want to be able to run these tests without (py)graphviz
        self.machine_cls = HierarchicalMarkupMachine
        self.num_trans = len(self.transitions)
        self.num_auto = len(self.states) * 9

    def test_nested_definitions(self):
        states = [{'name': 'A'},
                  {'name': 'B'},
                  {'name': 'C',
                   'children': [
                       {'name': '1'},
                       {'name': '2'}],
                   'transitions': [
                       {'trigger': 'go',
                        'source': '1',
                        'dest': '2'}],
                   'initial': '2'}]  # type: List[Dict]
        machine = self.machine_cls(states=states, initial='A', auto_transitions=False, name='TestMachine')
        markup = {k: v for k, v in machine.markup.items() if v and k != 'models'}
        self.assertEqual(dict(initial='A', states=states, name='TestMachine', model_attribute='state'), markup)


@skipIf(enum is None, "enum is not available")
class TestMarkupMachineEnum(TestMarkupMachine):

    class States(Enum):
        A = 1
        B = 2
        C = 3
        D = 4

    def setUp(self):
        self.machine_cls = MarkupMachine
        self.states = TestMarkupMachineEnum.States
        self.transitions = [
            {'trigger': 'walk', 'source': self.states.A, 'dest': self.states.B},
            {'trigger': 'run', 'source': self.states.B, 'dest': self.states.C},
            {'trigger': 'sprint', 'source': self.states.C, 'dest': self.states.D}
        ]
        self.num_trans = len(self.transitions)
        self.num_auto = len(self.states)**2
