from __future__ import absolute_import, unicode_literals

import json
import pickle
import sys
from datetime import date, datetime, time, timedelta

import pytest
import pytz
from case import Mock, mock, skip
from kombu import Queue

from celery.utils.serialization import (UnpickleableExceptionWrapper,
                                        ensure_serializable,
                                        get_pickleable_etype, jsonify)


class test_AAPickle:

    def test_no_cpickle(self):
        prev = sys.modules.pop('celery.utils.serialization', None)
        try:
            with mock.mask_modules('cPickle'):
                from celery.utils.serialization import pickle
                import pickle as orig_pickle
                assert pickle.dumps is orig_pickle.dumps
        finally:
            sys.modules['celery.utils.serialization'] = prev


class test_ensure_serializable:

    @skip.unless_python3()
    def test_json_py3(self):
        assert (1, "<class 'object'>") == \
            ensure_serializable([1, object], encoder=json.dumps)

    @skip.if_python3()
    def test_json_py2(self):
        assert (1, "<type 'object'>") == \
            ensure_serializable([1, object], encoder=json.dumps)

    def test_pickle(self):
        assert (1, object) == \
            ensure_serializable((1, object), encoder=pickle.dumps)


class test_UnpickleExceptionWrapper:

    def test_init(self):
        x = UnpickleableExceptionWrapper('foo', 'Bar', [10, lambda x: x])
        assert x.exc_args
        assert len(x.exc_args) == 2


class test_get_pickleable_etype:

    def test_get_pickleable_etype(self):

        class Unpickleable(Exception):
            def __reduce__(self):
                raise ValueError('foo')

        assert get_pickleable_etype(Unpickleable) is Exception


class test_jsonify:

    @pytest.mark.parametrize('obj', [
        Queue('foo'),
        ['foo', 'bar', 'baz'],
        {'foo': 'bar'},
        datetime.utcnow(),
        datetime.utcnow().replace(tzinfo=pytz.utc),
        datetime.utcnow().replace(microsecond=0),
        date(2012, 1, 1),
        time(hour=1, minute=30),
        time(hour=1, minute=30, microsecond=3),
        timedelta(seconds=30),
        10,
        10.3,
        'hello',
    ])
    def test_simple(self, obj):
        assert jsonify(obj)

    def test_unknown_type_filter(self):
        unknown_type_filter = Mock()
        obj = object()
        assert (jsonify(obj, unknown_type_filter=unknown_type_filter) is
                unknown_type_filter.return_value)
        unknown_type_filter.assert_called_with(obj)

        with pytest.raises(ValueError):
            jsonify(obj)