"""
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.
"""
# This is necessary in Python 2.5 to enable the with statement, in 2.6
# and up it is no longer necessary.
from __future__ import with_statement

import datetime
import decimal
try:
    from cStringIO import StringIO
except ImportError:
    from StringIO import StringIO

from django.core import serializers
from django.core.serializers import SerializerDoesNotExist
from django.db import connection
from django.test import TestCase
from django.utils.functional import curry

from models import *

# 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 behaviour, 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)
    testcase.assertEqual(data, instance.data,
         "Objects with PK=%d not equal; expected '%s' (%s), got '%s' (%s)" % (
            pk, data, type(data), instance.data, 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, BooleanData, True),
    (data_obj, 2, 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, u'\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, 110, PhoneData, "212-634-5789"),
    (data_obj, 111, PhoneData, 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),
    (data_obj, 180, USStateData, "MA"),
    (data_obj, 181, USStateData, None),
    (data_obj, 182, USStateData, ""),

    (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, 710, PhonePKData, "212-634-5789"),
    (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, 780, USStatePKData, "MA"),
#     (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),
]

# 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 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())

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 = serializers.deserialize(format, serialized_data).next()

    # 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
    stream = StringIO()
    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
    self.assertEqual(string_data, stream.getvalue())
    stream.close()

for format in serializers.get_serializer_formats():
    setattr(SerializerTests, 'test_' + format + '_serializer', curry(serializerTest, format))
    setattr(SerializerTests, 'test_' + format + '_serializer_fields', curry(fieldsTest, format))
    if format != 'python':
        setattr(SerializerTests, 'test_' + format + '_serializer_stream', curry(streamTest, format))