import datetime
import uuid
from decimal import Decimal

from django.core import checks, exceptions, serializers
from django.core.serializers.json import DjangoJSONEncoder
from django.db.models import Q
from django.forms import CharField, Form, widgets
from django.test.utils import isolate_apps
from django.utils.html import escape

from . import PostgreSQLSimpleTestCase, PostgreSQLTestCase
from .models import JSONModel, PostgreSQLModel

try:
    from django.contrib.postgres import forms
    from django.contrib.postgres.fields import JSONField
except ImportError:
    pass


class TestSaveLoad(PostgreSQLTestCase):
    def test_null(self):
        instance = JSONModel()
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertIsNone(loaded.field)

    def test_empty_object(self):
        instance = JSONModel(field={})
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field, {})

    def test_empty_list(self):
        instance = JSONModel(field=[])
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field, [])

    def test_boolean(self):
        instance = JSONModel(field=True)
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertIs(loaded.field, True)

    def test_string(self):
        instance = JSONModel(field='why?')
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field, 'why?')

    def test_number(self):
        instance = JSONModel(field=1)
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field, 1)

    def test_realistic_object(self):
        obj = {
            'a': 'b',
            'c': 1,
            'd': ['e', {'f': 'g'}],
            'h': True,
            'i': False,
            'j': None,
        }
        instance = JSONModel(field=obj)
        instance.save()
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field, obj)

    def test_custom_encoding(self):
        """
        JSONModel.field_custom has a custom DjangoJSONEncoder.
        """
        some_uuid = uuid.uuid4()
        obj_before = {
            'date': datetime.date(2016, 8, 12),
            'datetime': datetime.datetime(2016, 8, 12, 13, 44, 47, 575981),
            'decimal': Decimal('10.54'),
            'uuid': some_uuid,
        }
        obj_after = {
            'date': '2016-08-12',
            'datetime': '2016-08-12T13:44:47.575',
            'decimal': '10.54',
            'uuid': str(some_uuid),
        }
        JSONModel.objects.create(field_custom=obj_before)
        loaded = JSONModel.objects.get()
        self.assertEqual(loaded.field_custom, obj_after)


class TestQuerying(PostgreSQLTestCase):
    @classmethod
    def setUpTestData(cls):
        cls.objs = [
            JSONModel.objects.create(field=None),
            JSONModel.objects.create(field=True),
            JSONModel.objects.create(field=False),
            JSONModel.objects.create(field='yes'),
            JSONModel.objects.create(field=7),
            JSONModel.objects.create(field=[]),
            JSONModel.objects.create(field={}),
            JSONModel.objects.create(field={
                'a': 'b',
                'c': 1,
            }),
            JSONModel.objects.create(field={
                'a': 'b',
                'c': 1,
                'd': ['e', {'f': 'g'}],
                'h': True,
                'i': False,
                'j': None,
                'k': {'l': 'm'},
            }),
            JSONModel.objects.create(field=[1, [2]]),
            JSONModel.objects.create(field={
                'k': True,
                'l': False,
            }),
            JSONModel.objects.create(field={'foo': 'bar'}),
        ]

    def test_exact(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__exact={}),
            [self.objs[6]]
        )

    def test_exact_complex(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__exact={'a': 'b', 'c': 1}),
            [self.objs[7]]
        )

    def test_isnull(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__isnull=True),
            [self.objs[0]]
        )

    def test_ordering_by_transform(self):
        objs = [
            JSONModel.objects.create(field={'ord': 93, 'name': 'bar'}),
            JSONModel.objects.create(field={'ord': 22.1, 'name': 'foo'}),
            JSONModel.objects.create(field={'ord': -1, 'name': 'baz'}),
            JSONModel.objects.create(field={'ord': 21.931902, 'name': 'spam'}),
            JSONModel.objects.create(field={'ord': -100291029, 'name': 'eggs'}),
        ]
        query = JSONModel.objects.filter(field__name__isnull=False).order_by('field__ord')
        self.assertSequenceEqual(query, [objs[4], objs[2], objs[3], objs[1], objs[0]])

    def test_deep_values(self):
        query = JSONModel.objects.values_list('field__k__l')
        self.assertSequenceEqual(
            query,
            [
                (None,), (None,), (None,), (None,), (None,), (None,),
                (None,), (None,), ('m',), (None,), (None,), (None,),
            ]
        )

    def test_deep_distinct(self):
        query = JSONModel.objects.distinct('field__k__l').values_list('field__k__l')
        self.assertSequenceEqual(query, [('m',), (None,)])

    def test_isnull_key(self):
        # key__isnull works the same as has_key='key'.
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__a__isnull=True),
            self.objs[:7] + self.objs[9:]
        )
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__a__isnull=False),
            [self.objs[7], self.objs[8]]
        )

    def test_none_key(self):
        self.assertSequenceEqual(JSONModel.objects.filter(field__j=None), [self.objs[8]])

    def test_none_key_exclude(self):
        obj = JSONModel.objects.create(field={'j': 1})
        self.assertSequenceEqual(JSONModel.objects.exclude(field__j=None), [obj])

    def test_isnull_key_or_none(self):
        obj = JSONModel.objects.create(field={'a': None})
        self.assertSequenceEqual(
            JSONModel.objects.filter(Q(field__a__isnull=True) | Q(field__a=None)),
            self.objs[:7] + self.objs[9:] + [obj]
        )

    def test_contains(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__contains={'a': 'b'}),
            [self.objs[7], self.objs[8]]
        )

    def test_contained_by(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__contained_by={'a': 'b', 'c': 1, 'h': True}),
            [self.objs[6], self.objs[7]]
        )

    def test_has_key(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__has_key='a'),
            [self.objs[7], self.objs[8]]
        )

    def test_has_keys(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__has_keys=['a', 'c', 'h']),
            [self.objs[8]]
        )

    def test_has_any_keys(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__has_any_keys=['c', 'l']),
            [self.objs[7], self.objs[8], self.objs[10]]
        )

    def test_shallow_list_lookup(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__0=1),
            [self.objs[9]]
        )

    def test_shallow_obj_lookup(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__a='b'),
            [self.objs[7], self.objs[8]]
        )

    def test_deep_lookup_objs(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__k__l='m'),
            [self.objs[8]]
        )

    def test_shallow_lookup_obj_target(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__k={'l': 'm'}),
            [self.objs[8]]
        )

    def test_deep_lookup_array(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__1__0=2),
            [self.objs[9]]
        )

    def test_deep_lookup_mixed(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__d__1__f='g'),
            [self.objs[8]]
        )

    def test_deep_lookup_transform(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__c__gt=1),
            []
        )
        self.assertSequenceEqual(
            JSONModel.objects.filter(field__c__lt=5),
            [self.objs[7], self.objs[8]]
        )

    def test_usage_in_subquery(self):
        self.assertSequenceEqual(
            JSONModel.objects.filter(id__in=JSONModel.objects.filter(field__c=1)),
            self.objs[7:9]
        )

    def test_iexact(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__iexact='BaR').exists())
        self.assertFalse(JSONModel.objects.filter(field__foo__iexact='"BaR"').exists())

    def test_icontains(self):
        self.assertFalse(JSONModel.objects.filter(field__foo__icontains='"bar"').exists())

    def test_startswith(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__startswith='b').exists())

    def test_istartswith(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__istartswith='B').exists())

    def test_endswith(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__endswith='r').exists())

    def test_iendswith(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__iendswith='R').exists())

    def test_regex(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__regex=r'^bar$').exists())

    def test_iregex(self):
        self.assertTrue(JSONModel.objects.filter(field__foo__iregex=r'^bAr$').exists())


@isolate_apps('postgres_tests')
class TestChecks(PostgreSQLSimpleTestCase):

    def test_invalid_default(self):
        class MyModel(PostgreSQLModel):
            field = JSONField(default={})

        model = MyModel()
        self.assertEqual(model.check(), [
            checks.Warning(
                msg=(
                    "JSONField default should be a callable instead of an "
                    "instance so that it's not shared between all field "
                    "instances."
                ),
                hint='Use a callable instead, e.g., use `dict` instead of `{}`.',
                obj=MyModel._meta.get_field('field'),
                id='postgres.E003',
            )
        ])

    def test_valid_default(self):
        class MyModel(PostgreSQLModel):
            field = JSONField(default=dict)

        model = MyModel()
        self.assertEqual(model.check(), [])

    def test_valid_default_none(self):
        class MyModel(PostgreSQLModel):
            field = JSONField(default=None)

        model = MyModel()
        self.assertEqual(model.check(), [])


class TestSerialization(PostgreSQLSimpleTestCase):
    test_data = (
        '[{"fields": {"field": %s, "field_custom": null}, '
        '"model": "postgres_tests.jsonmodel", "pk": null}]'
    )
    test_values = (
        # (Python value, serialized value),
        ({'a': 'b', 'c': None}, '{"a": "b", "c": null}'),
        ('abc', '"abc"'),
        ('{"a": "a"}', '"{\\"a\\": \\"a\\"}"'),
    )

    def test_dumping(self):
        for value, serialized in self.test_values:
            with self.subTest(value=value):
                instance = JSONModel(field=value)
                data = serializers.serialize('json', [instance])
                self.assertJSONEqual(data, self.test_data % serialized)

    def test_loading(self):
        for value, serialized in self.test_values:
            with self.subTest(value=value):
                instance = list(serializers.deserialize('json', self.test_data % serialized))[0].object
                self.assertEqual(instance.field, value)


class TestValidation(PostgreSQLSimpleTestCase):

    def test_not_serializable(self):
        field = JSONField()
        with self.assertRaises(exceptions.ValidationError) as cm:
            field.clean(datetime.timedelta(days=1), None)
        self.assertEqual(cm.exception.code, 'invalid')
        self.assertEqual(cm.exception.message % cm.exception.params, "Value must be valid JSON.")

    def test_custom_encoder(self):
        with self.assertRaisesMessage(ValueError, "The encoder parameter must be a callable object."):
            field = JSONField(encoder=DjangoJSONEncoder())
        field = JSONField(encoder=DjangoJSONEncoder)
        self.assertEqual(field.clean(datetime.timedelta(days=1), None), datetime.timedelta(days=1))


class TestFormField(PostgreSQLSimpleTestCase):

    def test_valid(self):
        field = forms.JSONField()
        value = field.clean('{"a": "b"}')
        self.assertEqual(value, {'a': 'b'})

    def test_valid_empty(self):
        field = forms.JSONField(required=False)
        value = field.clean('')
        self.assertIsNone(value)

    def test_invalid(self):
        field = forms.JSONField()
        with self.assertRaises(exceptions.ValidationError) as cm:
            field.clean('{some badly formed: json}')
        self.assertEqual(cm.exception.messages[0], "'{some badly formed: json}' value must be valid JSON.")

    def test_formfield(self):
        model_field = JSONField()
        form_field = model_field.formfield()
        self.assertIsInstance(form_field, forms.JSONField)

    def test_formfield_disabled(self):
        class JsonForm(Form):
            name = CharField()
            jfield = forms.JSONField(disabled=True)

        form = JsonForm({'name': 'xyz', 'jfield': '["bar"]'}, initial={'jfield': ['foo']})
        self.assertIn('[&quot;foo&quot;]</textarea>', form.as_p())

    def test_prepare_value(self):
        field = forms.JSONField()
        self.assertEqual(field.prepare_value({'a': 'b'}), '{"a": "b"}')
        self.assertEqual(field.prepare_value(None), 'null')
        self.assertEqual(field.prepare_value('foo'), '"foo"')

    def test_redisplay_wrong_input(self):
        """
        When displaying a bound form (typically due to invalid input), the form
        should not overquote JSONField inputs.
        """
        class JsonForm(Form):
            name = CharField(max_length=2)
            jfield = forms.JSONField()

        # JSONField input is fine, name is too long
        form = JsonForm({'name': 'xyz', 'jfield': '["foo"]'})
        self.assertIn('[&quot;foo&quot;]</textarea>', form.as_p())

        # This time, the JSONField input is wrong
        form = JsonForm({'name': 'xy', 'jfield': '{"foo"}'})
        # Appears once in the textarea and once in the error message
        self.assertEqual(form.as_p().count(escape('{"foo"}')), 2)

    def test_widget(self):
        """The default widget of a JSONField is a Textarea."""
        field = forms.JSONField()
        self.assertIsInstance(field.widget, widgets.Textarea)

    def test_custom_widget_kwarg(self):
        """The widget can be overridden with a kwarg."""
        field = forms.JSONField(widget=widgets.Input)
        self.assertIsInstance(field.widget, widgets.Input)

    def test_custom_widget_attribute(self):
        """The widget can be overridden with an attribute."""
        class CustomJSONField(forms.JSONField):
            widget = widgets.Input

        field = CustomJSONField()
        self.assertIsInstance(field.widget, widgets.Input)

    def test_already_converted_value(self):
        field = forms.JSONField(required=False)
        tests = [
            '["a", "b", "c"]', '{"a": 1, "b": 2}', '1', '1.5', '"foo"',
            'true', 'false', 'null',
        ]
        for json_string in tests:
            val = field.clean(json_string)
            self.assertEqual(field.clean(val), val)

    def test_has_changed(self):
        field = forms.JSONField()
        self.assertIs(field.has_changed({'a': True}, '{"a": 1}'), True)
        self.assertIs(field.has_changed({'a': 1, 'b': 2}, '{"b": 2, "a": 1}'), False)
