"""
A test spanning all the capabilities of all the serializers.

This class defines sample data and a dynamically generated
test case that is capable of testing the capabilities of
the serializers. This includes all valid data values, plus
forward, backwards and self references.
"""
from __future__ import unicode_literals

import datetime
import decimal
from unittest import expectedFailure, skipUnless

try:
    import yaml
except ImportError:
    yaml = None

from django.core import serializers
from django.core.serializers import SerializerDoesNotExist
from django.core.serializers.base import DeserializationError
from django.core.serializers.xml_serializer import DTDForbidden
from django.db import connection, models
from django.http import HttpResponse
from django.test import TestCase
from django.utils import six
from django.utils.encoding import force_text
from django.utils.functional import curry

from .models import (BinaryData, BooleanData, CharData, DateData, DateTimeData, EmailData,
    FileData, FilePathData, DecimalData, FloatData, IntegerData, IPAddressData,
    GenericIPAddressData, NullBooleanData, PositiveIntegerData,
    PositiveSmallIntegerData, SlugData, SmallData, TextData, TimeData,
    GenericData, Anchor, UniqueAnchor, FKData, M2MData, O2OData,
    FKSelfData, M2MSelfData, FKDataToField, FKDataToO2O, M2MIntermediateData,
    Intermediate, BooleanPKData, CharPKData, EmailPKData, FilePathPKData,
    DecimalPKData, FloatPKData, IntegerPKData, IPAddressPKData,
    GenericIPAddressPKData, PositiveIntegerPKData,
    PositiveSmallIntegerPKData, SlugPKData, SmallPKData,
    AutoNowDateTimeData, ModifyingSaveData, InheritAbstractModel, BaseModel,
    ExplicitInheritBaseModel, InheritBaseModel, ProxyBaseModel,
    ProxyProxyBaseModel, BigIntegerData, LengthModel, Tag, ComplexModel,
    NaturalKeyAnchor, FKDataNaturalKey)

# A set of functions that can be used to recreate
# test data objects of various kinds.
# The save method is a raw base model save, to make
# sure that the data in the database matches the
# exact test case.
def data_create(pk, klass, data):
    instance = klass(id=pk)
    instance.data = data
    models.Model.save_base(instance, raw=True)
    return [instance]

def generic_create(pk, klass, data):
    instance = klass(id=pk)
    instance.data = data[0]
    models.Model.save_base(instance, raw=True)
    for tag in data[1:]:
        instance.tags.create(data=tag)
    return [instance]

def fk_create(pk, klass, data):
    instance = klass(id=pk)
    setattr(instance, 'data_id', data)
    models.Model.save_base(instance, raw=True)
    return [instance]

def m2m_create(pk, klass, data):
    instance = klass(id=pk)
    models.Model.save_base(instance, raw=True)
    instance.data = data
    return [instance]

def im2m_create(pk, klass, data):
    instance = klass(id=pk)
    models.Model.save_base(instance, raw=True)
    return [instance]

def im_create(pk, klass, data):
    instance = klass(id=pk)
    instance.right_id = data['right']
    instance.left_id = data['left']
    if 'extra' in data:
        instance.extra = data['extra']
    models.Model.save_base(instance, raw=True)
    return [instance]

def o2o_create(pk, klass, data):
    instance = klass()
    instance.data_id = data
    models.Model.save_base(instance, raw=True)
    return [instance]

def pk_create(pk, klass, data):
    instance = klass()
    instance.data = data
    models.Model.save_base(instance, raw=True)
    return [instance]

def inherited_create(pk, klass, data):
    instance = klass(id=pk,**data)
    # This isn't a raw save because:
    #  1) we're testing inheritance, not field behavior, so none
    #     of the field values need to be protected.
    #  2) saving the child class and having the parent created
    #     automatically is easier than manually creating both.
    models.Model.save(instance)
    created = [instance]
    for klass,field in instance._meta.parents.items():
        created.append(klass.objects.get(id=pk))
    return created

# A set of functions that can be used to compare
# test data objects of various kinds
def data_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    if klass == BinaryData and data is not None:
        testcase.assertEqual(bytes(data), bytes(instance.data),
             "Objects with PK=%d not equal; expected '%s' (%s), got '%s' (%s)" % (
                pk, repr(bytes(data)), type(data), repr(bytes(instance.data)),
                type(instance.data))
        )
    else:
        testcase.assertEqual(data, instance.data,
             "Objects with PK=%d not equal; expected '%s' (%s), got '%s' (%s)" % (
                pk, data, type(data), instance, type(instance.data))
        )

def generic_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    testcase.assertEqual(data[0], instance.data)
    testcase.assertEqual(data[1:], [t.data for t in instance.tags.order_by('id')])

def fk_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    testcase.assertEqual(data, instance.data_id)

def m2m_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    testcase.assertEqual(data, [obj.id for obj in instance.data.order_by('id')])

def im2m_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    #actually nothing else to check, the instance just should exist

def im_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    testcase.assertEqual(data['left'], instance.left_id)
    testcase.assertEqual(data['right'], instance.right_id)
    if 'extra' in data:
        testcase.assertEqual(data['extra'], instance.extra)
    else:
        testcase.assertEqual("doesn't matter", instance.extra)

def o2o_compare(testcase, pk, klass, data):
    instance = klass.objects.get(data=data)
    testcase.assertEqual(data, instance.data_id)

def pk_compare(testcase, pk, klass, data):
    instance = klass.objects.get(data=data)
    testcase.assertEqual(data, instance.data)

def inherited_compare(testcase, pk, klass, data):
    instance = klass.objects.get(id=pk)
    for key,value in data.items():
        testcase.assertEqual(value, getattr(instance,key))

# Define some data types. Each data type is
# actually a pair of functions; one to create
# and one to compare objects of that type
data_obj = (data_create, data_compare)
generic_obj = (generic_create, generic_compare)
fk_obj = (fk_create, fk_compare)
m2m_obj = (m2m_create, m2m_compare)
im2m_obj = (im2m_create, im2m_compare)
im_obj = (im_create, im_compare)
o2o_obj = (o2o_create, o2o_compare)
pk_obj = (pk_create, pk_compare)
inherited_obj = (inherited_create, inherited_compare)

test_data = [
    # Format: (data type, PK value, Model Class, data)
    (data_obj, 1, BinaryData, six.memoryview(b"\x05\xFD\x00")),
    (data_obj, 2, BinaryData, None),
    (data_obj, 5, BooleanData, True),
    (data_obj, 6, BooleanData, False),
    (data_obj, 10, CharData, "Test Char Data"),
    (data_obj, 11, CharData, ""),
    (data_obj, 12, CharData, "None"),
    (data_obj, 13, CharData, "null"),
    (data_obj, 14, CharData, "NULL"),
    (data_obj, 15, CharData, None),
    # (We use something that will fit into a latin1 database encoding here,
    # because that is still the default used on many system setups.)
    (data_obj, 16, CharData, '\xa5'),
    (data_obj, 20, DateData, datetime.date(2006,6,16)),
    (data_obj, 21, DateData, None),
    (data_obj, 30, DateTimeData, datetime.datetime(2006,6,16,10,42,37)),
    (data_obj, 31, DateTimeData, None),
    (data_obj, 40, EmailData, "hovercraft@example.com"),
    (data_obj, 41, EmailData, None),
    (data_obj, 42, EmailData, ""),
    (data_obj, 50, FileData, 'file:///foo/bar/whiz.txt'),
#     (data_obj, 51, FileData, None),
    (data_obj, 52, FileData, ""),
    (data_obj, 60, FilePathData, "/foo/bar/whiz.txt"),
    (data_obj, 61, FilePathData, None),
    (data_obj, 62, FilePathData, ""),
    (data_obj, 70, DecimalData, decimal.Decimal('12.345')),
    (data_obj, 71, DecimalData, decimal.Decimal('-12.345')),
    (data_obj, 72, DecimalData, decimal.Decimal('0.0')),
    (data_obj, 73, DecimalData, None),
    (data_obj, 74, FloatData, 12.345),
    (data_obj, 75, FloatData, -12.345),
    (data_obj, 76, FloatData, 0.0),
    (data_obj, 77, FloatData, None),
    (data_obj, 80, IntegerData, 123456789),
    (data_obj, 81, IntegerData, -123456789),
    (data_obj, 82, IntegerData, 0),
    (data_obj, 83, IntegerData, None),
    #(XX, ImageData
    (data_obj, 90, IPAddressData, "127.0.0.1"),
    (data_obj, 91, IPAddressData, None),
    (data_obj, 95, GenericIPAddressData, "fe80:1424:2223:6cff:fe8a:2e8a:2151:abcd"),
    (data_obj, 96, GenericIPAddressData, None),
    (data_obj, 100, NullBooleanData, True),
    (data_obj, 101, NullBooleanData, False),
    (data_obj, 102, NullBooleanData, None),
    (data_obj, 120, PositiveIntegerData, 123456789),
    (data_obj, 121, PositiveIntegerData, None),
    (data_obj, 130, PositiveSmallIntegerData, 12),
    (data_obj, 131, PositiveSmallIntegerData, None),
    (data_obj, 140, SlugData, "this-is-a-slug"),
    (data_obj, 141, SlugData, None),
    (data_obj, 142, SlugData, ""),
    (data_obj, 150, SmallData, 12),
    (data_obj, 151, SmallData, -12),
    (data_obj, 152, SmallData, 0),
    (data_obj, 153, SmallData, None),
    (data_obj, 160, TextData, """This is a long piece of text.
It contains line breaks.
Several of them.
The end."""),
    (data_obj, 161, TextData, ""),
    (data_obj, 162, TextData, None),
    (data_obj, 170, TimeData, datetime.time(10,42,37)),
    (data_obj, 171, TimeData, None),

    (generic_obj, 200, GenericData, ['Generic Object 1', 'tag1', 'tag2']),
    (generic_obj, 201, GenericData, ['Generic Object 2', 'tag2', 'tag3']),

    (data_obj, 300, Anchor, "Anchor 1"),
    (data_obj, 301, Anchor, "Anchor 2"),
    (data_obj, 302, UniqueAnchor, "UAnchor 1"),

    (fk_obj, 400, FKData, 300), # Post reference
    (fk_obj, 401, FKData, 500), # Pre reference
    (fk_obj, 402, FKData, None), # Empty reference

    (m2m_obj, 410, M2MData, []), # Empty set
    (m2m_obj, 411, M2MData, [300,301]), # Post reference
    (m2m_obj, 412, M2MData, [500,501]), # Pre reference
    (m2m_obj, 413, M2MData, [300,301,500,501]), # Pre and Post reference

    (o2o_obj, None, O2OData, 300), # Post reference
    (o2o_obj, None, O2OData, 500), # Pre reference

    (fk_obj, 430, FKSelfData, 431), # Pre reference
    (fk_obj, 431, FKSelfData, 430), # Post reference
    (fk_obj, 432, FKSelfData, None), # Empty reference

    (m2m_obj, 440, M2MSelfData, []),
    (m2m_obj, 441, M2MSelfData, []),
    (m2m_obj, 442, M2MSelfData, [440, 441]),
    (m2m_obj, 443, M2MSelfData, [445, 446]),
    (m2m_obj, 444, M2MSelfData, [440, 441, 445, 446]),
    (m2m_obj, 445, M2MSelfData, []),
    (m2m_obj, 446, M2MSelfData, []),

    (fk_obj, 450, FKDataToField, "UAnchor 1"),
    (fk_obj, 451, FKDataToField, "UAnchor 2"),
    (fk_obj, 452, FKDataToField, None),

    (fk_obj, 460, FKDataToO2O, 300),

    (im2m_obj, 470, M2MIntermediateData, None),

    #testing post- and prereferences and extra fields
    (im_obj, 480, Intermediate, {'right': 300, 'left': 470}),
    (im_obj, 481, Intermediate, {'right': 300, 'left': 490}),
    (im_obj, 482, Intermediate, {'right': 500, 'left': 470}),
    (im_obj, 483, Intermediate, {'right': 500, 'left': 490}),
    (im_obj, 484, Intermediate, {'right': 300, 'left': 470, 'extra': "extra"}),
    (im_obj, 485, Intermediate, {'right': 300, 'left': 490, 'extra': "extra"}),
    (im_obj, 486, Intermediate, {'right': 500, 'left': 470, 'extra': "extra"}),
    (im_obj, 487, Intermediate, {'right': 500, 'left': 490, 'extra': "extra"}),

    (im2m_obj, 490, M2MIntermediateData, []),

    (data_obj, 500, Anchor, "Anchor 3"),
    (data_obj, 501, Anchor, "Anchor 4"),
    (data_obj, 502, UniqueAnchor, "UAnchor 2"),

    (pk_obj, 601, BooleanPKData, True),
    (pk_obj, 602, BooleanPKData, False),
    (pk_obj, 610, CharPKData, "Test Char PKData"),
#     (pk_obj, 620, DatePKData, datetime.date(2006,6,16)),
#     (pk_obj, 630, DateTimePKData, datetime.datetime(2006,6,16,10,42,37)),
    (pk_obj, 640, EmailPKData, "hovercraft@example.com"),
#     (pk_obj, 650, FilePKData, 'file:///foo/bar/whiz.txt'),
    (pk_obj, 660, FilePathPKData, "/foo/bar/whiz.txt"),
    (pk_obj, 670, DecimalPKData, decimal.Decimal('12.345')),
    (pk_obj, 671, DecimalPKData, decimal.Decimal('-12.345')),
    (pk_obj, 672, DecimalPKData, decimal.Decimal('0.0')),
    (pk_obj, 673, FloatPKData, 12.345),
    (pk_obj, 674, FloatPKData, -12.345),
    (pk_obj, 675, FloatPKData, 0.0),
    (pk_obj, 680, IntegerPKData, 123456789),
    (pk_obj, 681, IntegerPKData, -123456789),
    (pk_obj, 682, IntegerPKData, 0),
#     (XX, ImagePKData
    (pk_obj, 690, IPAddressPKData, "127.0.0.1"),
    (pk_obj, 695, GenericIPAddressPKData, "fe80:1424:2223:6cff:fe8a:2e8a:2151:abcd"),
    # (pk_obj, 700, NullBooleanPKData, True),
    # (pk_obj, 701, NullBooleanPKData, False),
    (pk_obj, 720, PositiveIntegerPKData, 123456789),
    (pk_obj, 730, PositiveSmallIntegerPKData, 12),
    (pk_obj, 740, SlugPKData, "this-is-a-slug"),
    (pk_obj, 750, SmallPKData, 12),
    (pk_obj, 751, SmallPKData, -12),
    (pk_obj, 752, SmallPKData, 0),
#     (pk_obj, 760, TextPKData, """This is a long piece of text.
# It contains line breaks.
# Several of them.
# The end."""),
#    (pk_obj, 770, TimePKData, datetime.time(10,42,37)),
#     (pk_obj, 790, XMLPKData, "<foo></foo>"),

    (data_obj, 800, AutoNowDateTimeData, datetime.datetime(2006,6,16,10,42,37)),
    (data_obj, 810, ModifyingSaveData, 42),

    (inherited_obj, 900, InheritAbstractModel, {'child_data':37,'parent_data':42}),
    (inherited_obj, 910, ExplicitInheritBaseModel, {'child_data':37,'parent_data':42}),
    (inherited_obj, 920, InheritBaseModel, {'child_data':37,'parent_data':42}),

    (data_obj, 1000, BigIntegerData, 9223372036854775807),
    (data_obj, 1001, BigIntegerData, -9223372036854775808),
    (data_obj, 1002, BigIntegerData, 0),
    (data_obj, 1003, BigIntegerData, None),
    (data_obj, 1004, LengthModel, 0),
    (data_obj, 1005, LengthModel, 1),
]

natural_key_test_data = [
    (data_obj, 1100, NaturalKeyAnchor, "Natural Key Anghor"),
    (fk_obj, 1101, FKDataNaturalKey, 1100),
    (fk_obj, 1102, FKDataNaturalKey, None),
]

# Because Oracle treats the empty string as NULL, Oracle is expected to fail
# when field.empty_strings_allowed is True and the value is None; skip these
# tests.
if connection.features.interprets_empty_strings_as_nulls:
    test_data = [data for data in test_data
                 if not (data[0] == data_obj and
                         data[2]._meta.get_field('data').empty_strings_allowed and
                         data[3] is None)]

# Regression test for #8651 -- a FK to an object iwth PK of 0
# This won't work on MySQL since it won't let you create an object
# with a primary key of 0,
if connection.features.allows_primary_key_0:
    test_data.extend([
        (data_obj, 0, Anchor, "Anchor 0"),
        (fk_obj, 465, FKData, 0),
    ])

# Dynamically create serializer tests to ensure that all
# registered serializers are automatically tested.
class SerializerTests(TestCase):
    def test_get_unknown_serializer(self):
        """
        #15889: get_serializer('nonsense') raises a SerializerDoesNotExist
        """
        with self.assertRaises(SerializerDoesNotExist):
            serializers.get_serializer("nonsense")

        with self.assertRaises(KeyError):
            serializers.get_serializer("nonsense")

        # SerializerDoesNotExist is instantiated with the nonexistent format
        with self.assertRaises(SerializerDoesNotExist) as cm:
            serializers.get_serializer("nonsense")
        self.assertEqual(cm.exception.args, ("nonsense",))

    def test_unregister_unkown_serializer(self):
        with self.assertRaises(SerializerDoesNotExist):
            serializers.unregister_serializer("nonsense")

    def test_get_unkown_deserializer(self):
        with self.assertRaises(SerializerDoesNotExist):
            serializers.get_deserializer("nonsense")

    def test_json_deserializer_exception(self):
        with self.assertRaises(DeserializationError):
            for obj in serializers.deserialize("json", """[{"pk":1}"""):
                pass

    @skipUnless(yaml, "PyYAML not installed")
    def test_yaml_deserializer_exception(self):
        with self.assertRaises(DeserializationError):
            for obj in serializers.deserialize("yaml", "{"):
                pass

    def test_serialize_proxy_model(self):
        BaseModel.objects.create(parent_data=1)
        base_objects = BaseModel.objects.all()
        proxy_objects = ProxyBaseModel.objects.all()
        proxy_proxy_objects = ProxyProxyBaseModel.objects.all()
        base_data = serializers.serialize("json", base_objects)
        proxy_data = serializers.serialize("json", proxy_objects)
        proxy_proxy_data = serializers.serialize("json", proxy_proxy_objects)
        self.assertEqual(base_data, proxy_data.replace('proxy', ''))
        self.assertEqual(base_data, proxy_proxy_data.replace('proxy', ''))


def serializerTest(format, self):

    # Create all the objects defined in the test data
    objects = []
    instance_count = {}
    for (func, pk, klass, datum) in test_data:
        with connection.constraint_checks_disabled():
            objects.extend(func[0](pk, klass, datum))

    # Get a count of the number of objects created for each class
    for klass in instance_count:
        instance_count[klass] = klass.objects.count()

    # Add the generic tagged objects to the object list
    objects.extend(Tag.objects.all())

    # Serialize the test database
    serialized_data = serializers.serialize(format, objects, indent=2)

    for obj in serializers.deserialize(format, serialized_data):
        obj.save()

    # Assert that the deserialized data is the same
    # as the original source
    for (func, pk, klass, datum) in test_data:
        func[1](self, pk, klass, datum)

    # Assert that the number of objects deserialized is the
    # same as the number that was serialized.
    for klass, count in instance_count.items():
        self.assertEqual(count, klass.objects.count())

if connection.vendor == 'mysql' and six.PY3:
    # Existing MySQL DB-API drivers fail on binary data.
    serializerTest = expectedFailure(serializerTest)


def naturalKeySerializerTest(format, self):
    # Create all the objects defined in the test data
    objects = []
    instance_count = {}
    for (func, pk, klass, datum) in natural_key_test_data:
        with connection.constraint_checks_disabled():
            objects.extend(func[0](pk, klass, datum))

    # Get a count of the number of objects created for each class
    for klass in instance_count:
        instance_count[klass] = klass.objects.count()

    # Serialize the test database
    serialized_data = serializers.serialize(format, objects, indent=2,
        use_natural_keys=True)

    for obj in serializers.deserialize(format, serialized_data):
        obj.save()

    # Assert that the deserialized data is the same
    # as the original source
    for (func, pk, klass, datum) in natural_key_test_data:
        func[1](self, pk, klass, datum)

    # Assert that the number of objects deserialized is the
    # same as the number that was serialized.
    for klass, count in instance_count.items():
        self.assertEqual(count, klass.objects.count())

def fieldsTest(format, self):
    obj = ComplexModel(field1='first', field2='second', field3='third')
    obj.save_base(raw=True)

    # Serialize then deserialize the test database
    serialized_data = serializers.serialize(format, [obj], indent=2, fields=('field1','field3'))
    result = next(serializers.deserialize(format, serialized_data))

    # Check that the deserialized object contains data in only the serialized fields.
    self.assertEqual(result.object.field1, 'first')
    self.assertEqual(result.object.field2, '')
    self.assertEqual(result.object.field3, 'third')

def streamTest(format, self):
    obj = ComplexModel(field1='first',field2='second',field3='third')
    obj.save_base(raw=True)

    # Serialize the test database to a stream
    for stream in (six.StringIO(), HttpResponse()):
        serializers.serialize(format, [obj], indent=2, stream=stream)

        # Serialize normally for a comparison
        string_data = serializers.serialize(format, [obj], indent=2)

        # Check that the two are the same
        if isinstance(stream, six.StringIO):
            self.assertEqual(string_data, stream.getvalue())
        else:
            self.assertEqual(string_data, stream.content.decode('utf-8'))

for format in [
            f for f in serializers.get_serializer_formats()
            if not isinstance(serializers.get_serializer(f), serializers.BadSerializer)
        ]:
    setattr(SerializerTests, 'test_' + format + '_serializer', curry(serializerTest, format))
    setattr(SerializerTests, 'test_' + format + '_natural_key_serializer', curry(naturalKeySerializerTest, format))
    setattr(SerializerTests, 'test_' + format + '_serializer_fields', curry(fieldsTest, format))
    if format != 'python':
        setattr(SerializerTests, 'test_' + format + '_serializer_stream', curry(streamTest, format))


class XmlDeserializerSecurityTests(TestCase):

    def test_no_dtd(self):
        """
        The XML deserializer shouldn't allow a DTD.

        This is the most straightforward way to prevent all entity definitions
        and avoid both external entities and entity-expansion attacks.

        """
        xml = '<?xml version="1.0" standalone="no"?><!DOCTYPE example SYSTEM "http://example.com/example.dtd">'
        with self.assertRaises(DTDForbidden):
            next(serializers.deserialize('xml', xml))
