# -*- coding: utf-8 -*-
# Unittests for fixtures.
from __future__ import absolute_import

import os
import re
from io import BytesIO

from django.core import management
from django.core.management.base import CommandError
from django.core.management.commands.dumpdata import sort_dependencies
from django.db import transaction
from django.db.models import signals
from django.test import (TestCase, TransactionTestCase, skipIfDBFeature,
    skipUnlessDBFeature)
from django.test.utils import override_settings

from .models import (Animal, Stuff, Absolute, Parent, Child, Article, Widget,
    Store, Person, Book, NKChild, RefToNKChild, Circle1, Circle2, Circle3,
    ExternalDependency, Thingy)


pre_save_checks = []
def animal_pre_save_check(signal, sender, instance, **kwargs):
    "A signal that is used to check the type of data loaded from fixtures"
    pre_save_checks.append(
        (
            'Count = %s (%s)' % (instance.count, type(instance.count)),
            'Weight = %s (%s)' % (instance.weight, type(instance.weight)),
        )
    )


class TestFixtures(TestCase):
    def test_duplicate_pk(self):
        """
        This is a regression test for ticket #3790.
        """
        # Load a fixture that uses PK=1
        management.call_command(
            'loaddata',
            'sequence',
            verbosity=0,
            commit=False
        )

        # Create a new animal. Without a sequence reset, this new object
        # will take a PK of 1 (on Postgres), and the save will fail.

        animal = Animal(
            name='Platypus',
            latin_name='Ornithorhynchus anatinus',
            count=2,
            weight=2.2
        )
        animal.save()
        self.assertGreater(animal.id, 1)

    @skipIfDBFeature('interprets_empty_strings_as_nulls')
    def test_pretty_print_xml(self):
        """
        Regression test for ticket #4558 -- pretty printing of XML fixtures
        doesn't affect parsing of None values.
        """
        # Load a pretty-printed XML fixture with Nulls.
        management.call_command(
            'loaddata',
            'pretty.xml',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Stuff.objects.all()[0].name, None)
        self.assertEqual(Stuff.objects.all()[0].owner, None)

    @skipUnlessDBFeature('interprets_empty_strings_as_nulls')
    def test_pretty_print_xml_empty_strings(self):
        """
        Regression test for ticket #4558 -- pretty printing of XML fixtures
        doesn't affect parsing of None values.
        """
        # Load a pretty-printed XML fixture with Nulls.
        management.call_command(
            'loaddata',
            'pretty.xml',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Stuff.objects.all()[0].name, u'')
        self.assertEqual(Stuff.objects.all()[0].owner, None)

    def test_absolute_path(self):
        """
        Regression test for ticket #6436 --
        os.path.join will throw away the initial parts of a path if it
        encounters an absolute path.
        This means that if a fixture is specified as an absolute path,
        we need to make sure we don't discover the absolute path in every
        fixture directory.
        """
        load_absolute_path = os.path.join(
            os.path.dirname(__file__),
            'fixtures',
            'absolute.json'
        )
        management.call_command(
            'loaddata',
            load_absolute_path,
            verbosity=0,
            commit=False
        )
        self.assertEqual(Absolute.load_count, 1)


    def test_unknown_format(self):
        """
        Test for ticket #4371 -- Loading data of an unknown format should fail
        Validate that error conditions are caught correctly
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'bad_fixture1.unkn',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(),
            "Problem installing fixture 'bad_fixture1': unkn is not a known serialization format.\n"
        )

    def test_invalid_data(self):
        """
        Test for ticket #4371 -- Loading a fixture file with invalid data
        using explicit filename.
        Validate that error conditions are caught correctly
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'bad_fixture2.xml',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(),
            "No fixture data found for 'bad_fixture2'. (File format may be invalid.)\n"
        )

    def test_invalid_data_no_ext(self):
        """
        Test for ticket #4371 -- Loading a fixture file with invalid data
        without file extension.
        Validate that error conditions are caught correctly
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'bad_fixture2',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(),
            "No fixture data found for 'bad_fixture2'. (File format may be invalid.)\n"
        )

    def test_empty(self):
        """
        Test for ticket #4371 -- Loading a fixture file with no data returns an error.
        Validate that error conditions are caught correctly
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'empty',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(),
            "No fixture data found for 'empty'. (File format may be invalid.)\n"
        )

    def test_error_message(self):
        """
        (Regression for #9011 - error message is correct)
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'bad_fixture2',
            'animal',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(),
            "No fixture data found for 'bad_fixture2'. (File format may be invalid.)\n"
        )

    def test_pg_sequence_resetting_checks(self):
        """
        Test for ticket #7565 -- PostgreSQL sequence resetting checks shouldn't
        ascend to parent models when inheritance is used
        (since they are treated individually).
        """
        management.call_command(
            'loaddata',
            'model-inheritance.json',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Parent.objects.all()[0].id, 1)
        self.assertEqual(Child.objects.all()[0].id, 1)

    def test_close_connection_after_loaddata(self):
        """
        Test for ticket #7572 -- MySQL has a problem if the same connection is
        used to create tables, load data, and then query over that data.
        To compensate, we close the connection after running loaddata.
        This ensures that a new connection is opened when test queries are
        issued.
        """
        management.call_command(
            'loaddata',
            'big-fixture.json',
            verbosity=0,
            commit=False
        )
        articles = Article.objects.exclude(id=9)
        self.assertEqual(
            list(articles.values_list('id', flat=True)),
            [1, 2, 3, 4, 5, 6, 7, 8]
        )
        # Just for good measure, run the same query again.
        # Under the influence of ticket #7572, this will
        # give a different result to the previous call.
        self.assertEqual(
            list(articles.values_list('id', flat=True)),
            [1, 2, 3, 4, 5, 6, 7, 8]
        )

    def test_field_value_coerce(self):
        """
        Test for tickets #8298, #9942 - Field values should be coerced into the
        correct type by the deserializer, not as part of the database write.
        """
        global pre_save_checks
        pre_save_checks = []
        signals.pre_save.connect(animal_pre_save_check)
        try:
            management.call_command(
                'loaddata',
                'animal.xml',
                verbosity=0,
                commit=False,
            )
            self.assertEqual(
                pre_save_checks,
                [
                    ("Count = 42 (<type 'int'>)", "Weight = 1.2 (<type 'float'>)")
                ]
            )
        finally:
            signals.pre_save.disconnect(animal_pre_save_check)

    def test_dumpdata_uses_default_manager(self):
        """
        Regression for #11286
        Ensure that dumpdata honors the default manager
        Dump the current contents of the database as a JSON fixture
        """
        management.call_command(
            'loaddata',
            'animal.xml',
            verbosity=0,
            commit=False,
        )
        management.call_command(
            'loaddata',
            'sequence.json',
            verbosity=0,
            commit=False,
        )
        animal = Animal(
            name='Platypus',
            latin_name='Ornithorhynchus anatinus',
            count=2,
            weight=2.2
        )
        animal.save()

        stdout = BytesIO()
        management.call_command(
            'dumpdata',
            'fixtures_regress.animal',
            format='json',
            stdout=stdout
        )

        # Output order isn't guaranteed, so check for parts
        data = stdout.getvalue()

        # Get rid of artifacts like '000000002' to eliminate the differences
        # between different Python versions.
        data = re.sub('0{6,}\d', '', data)

        lion_json = '{"pk": 1, "model": "fixtures_regress.animal", "fields": {"count": 3, "weight": 1.2, "name": "Lion", "latin_name": "Panthera leo"}}'
        emu_json = '{"pk": 10, "model": "fixtures_regress.animal", "fields": {"count": 42, "weight": 1.2, "name": "Emu", "latin_name": "Dromaius novaehollandiae"}}'
        platypus_json = '{"pk": %d, "model": "fixtures_regress.animal", "fields": {"count": 2, "weight": 2.2, "name": "Platypus", "latin_name": "Ornithorhynchus anatinus"}}'
        platypus_json = platypus_json % animal.pk

        self.assertEqual(len(data), len('[%s]' % ', '.join([lion_json, emu_json, platypus_json])))
        self.assertTrue(lion_json in data)
        self.assertTrue(emu_json in data)
        self.assertTrue(platypus_json in data)

    def test_proxy_model_included(self):
        """
        Regression for #11428 - Proxy models aren't included when you dumpdata
        """
        stdout = BytesIO()
        # Create an instance of the concrete class
        widget = Widget.objects.create(name='grommet')
        management.call_command(
            'dumpdata',
            'fixtures_regress.widget',
            'fixtures_regress.widgetproxy',
            format='json',
            stdout=stdout
        )
        self.assertEqual(
            stdout.getvalue(),
            """[{"pk": %d, "model": "fixtures_regress.widget", "fields": {"name": "grommet"}}]"""
            % widget.pk
            )

    def test_loaddata_works_when_fixture_has_forward_refs(self):
        """
        Regression for #3615 - Forward references cause fixtures not to load in MySQL (InnoDB)
        """
        management.call_command(
            'loaddata',
            'forward_ref.json',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Book.objects.all()[0].id, 1)
        self.assertEqual(Person.objects.all()[0].id, 4)

    def test_loaddata_raises_error_when_fixture_has_invalid_foreign_key(self):
        """
        Regression for #3615 - Ensure data with nonexistent child key references raises error
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            'forward_ref_bad_data.json',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertTrue(
            stderr.getvalue().startswith('Problem installing fixture')
        )

    _cur_dir = os.path.dirname(os.path.abspath(__file__))

    @override_settings(FIXTURE_DIRS=[os.path.join(_cur_dir, 'fixtures_1'),
                                     os.path.join(_cur_dir, 'fixtures_2')])
    def test_loaddata_forward_refs_split_fixtures(self):
        """
        Regression for #17530 - should be able to cope with forward references
        when the fixtures are not in the same files or directories.
        """
        management.call_command(
            'loaddata',
            'forward_ref_1.json',
            'forward_ref_2.json',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Book.objects.all()[0].id, 1)
        self.assertEqual(Person.objects.all()[0].id, 4)

    def test_loaddata_no_fixture_specified(self):
        """
        Regression for #7043 - Error is quickly reported when no fixtures is provided in the command line.
        """
        stderr = BytesIO()
        management.call_command(
            'loaddata',
            verbosity=0,
            commit=False,
            stderr=stderr,
        )
        self.assertEqual(
            stderr.getvalue(), 'No database fixture specified. Please provide the path of at least one fixture in the command line.\n'
        )

    def test_loaddata_not_existant_fixture_file(self):
        stdout_output = BytesIO()
        management.call_command(
            'loaddata',
            'this_fixture_doesnt_exist',
            verbosity=2,
            commit=False,
            stdout=stdout_output,
        )
        self.assertTrue("No xml fixture 'this_fixture_doesnt_exist' in" in
            stdout_output.getvalue())


class NaturalKeyFixtureTests(TestCase):

    def test_nk_deserialize(self):
        """
        Test for ticket #13030 - Python based parser version
        natural keys deserialize with fk to inheriting model
        """
        management.call_command(
            'loaddata',
            'model-inheritance.json',
            verbosity=0,
            commit=False
        )
        management.call_command(
            'loaddata',
            'nk-inheritance.json',
            verbosity=0,
            commit=False
        )
        self.assertEqual(
            NKChild.objects.get(pk=1).data,
            'apple'
        )

        self.assertEqual(
            RefToNKChild.objects.get(pk=1).nk_fk.data,
            'apple'
        )

    def test_nk_deserialize_xml(self):
        """
        Test for ticket #13030 - XML version
        natural keys deserialize with fk to inheriting model
        """
        management.call_command(
            'loaddata',
            'model-inheritance.json',
            verbosity=0,
            commit=False
        )
        management.call_command(
            'loaddata',
            'nk-inheritance.json',
            verbosity=0,
            commit=False
        )
        management.call_command(
            'loaddata',
            'nk-inheritance2.xml',
            verbosity=0,
            commit=False
        )
        self.assertEqual(
            NKChild.objects.get(pk=2).data,
            'banana'
        )
        self.assertEqual(
            RefToNKChild.objects.get(pk=2).nk_fk.data,
            'apple'
        )

    def test_nk_on_serialize(self):
        """
        Check that natural key requirements are taken into account
        when serializing models
        """
        management.call_command(
            'loaddata',
            'forward_ref_lookup.json',
            verbosity=0,
            commit=False
            )

        stdout = BytesIO()
        management.call_command(
            'dumpdata',
            'fixtures_regress.book',
            'fixtures_regress.person',
            'fixtures_regress.store',
            verbosity=0,
            format='json',
            use_natural_keys=True,
            stdout=stdout,
        )
        self.assertEqual(
            stdout.getvalue(),
            """[{"pk": 2, "model": "fixtures_regress.store", "fields": {"name": "Amazon"}}, {"pk": 3, "model": "fixtures_regress.store", "fields": {"name": "Borders"}}, {"pk": 4, "model": "fixtures_regress.person", "fields": {"name": "Neal Stephenson"}}, {"pk": 1, "model": "fixtures_regress.book", "fields": {"stores": [["Amazon"], ["Borders"]], "name": "Cryptonomicon", "author": ["Neal Stephenson"]}}]"""
        )

    def test_dependency_sorting(self):
        """
        Now lets check the dependency sorting explicitly
        It doesn't matter what order you mention the models
        Store *must* be serialized before then Person, and both
        must be serialized before Book.
        """
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Book, Person, Store])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_2(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Book, Store, Person])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_3(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Store, Book, Person])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_4(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Store, Person, Book])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_5(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Person, Book, Store])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_6(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Person, Store, Book])]
        )
        self.assertEqual(
            sorted_deps,
            [Store, Person, Book]
        )

    def test_dependency_sorting_dangling(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Person, Circle1, Store, Book])]
        )
        self.assertEqual(
            sorted_deps,
            [Circle1, Store, Person, Book]
        )

    def test_dependency_sorting_tight_circular(self):
        self.assertRaisesMessage(
            CommandError,
            """Can't resolve dependencies for fixtures_regress.Circle1, fixtures_regress.Circle2 in serialized app list.""",
            sort_dependencies,
            [('fixtures_regress', [Person, Circle2, Circle1, Store, Book])],
        )

    def test_dependency_sorting_tight_circular_2(self):
        self.assertRaisesMessage(
            CommandError,
            """Can't resolve dependencies for fixtures_regress.Circle1, fixtures_regress.Circle2 in serialized app list.""",
            sort_dependencies,
            [('fixtures_regress', [Circle1, Book, Circle2])],
        )

    def test_dependency_self_referential(self):
        self.assertRaisesMessage(
            CommandError,
            """Can't resolve dependencies for fixtures_regress.Circle3 in serialized app list.""",
            sort_dependencies,
            [('fixtures_regress', [Book, Circle3])],
        )

    def test_dependency_sorting_long(self):
        self.assertRaisesMessage(
            CommandError,
            """Can't resolve dependencies for fixtures_regress.Circle1, fixtures_regress.Circle2, fixtures_regress.Circle3 in serialized app list.""",
            sort_dependencies,
            [('fixtures_regress', [Person, Circle2, Circle1, Circle3, Store, Book])],
        )

    def test_dependency_sorting_normal(self):
        sorted_deps = sort_dependencies(
            [('fixtures_regress', [Person, ExternalDependency, Book])]
        )
        self.assertEqual(
            sorted_deps,
            [Person, Book, ExternalDependency]
        )

    def test_normal_pk(self):
        """
        Check that normal primary keys still work
        on a model with natural key capabilities
        """
        management.call_command(
            'loaddata',
            'non_natural_1.json',
            verbosity=0,
            commit=False
        )
        management.call_command(
            'loaddata',
            'forward_ref_lookup.json',
            verbosity=0,
            commit=False
        )
        management.call_command(
            'loaddata',
            'non_natural_2.xml',
            verbosity=0,
            commit=False
        )
        books = Book.objects.all()
        self.assertEqual(
            books.__repr__(),
            """[<Book: Cryptonomicon by Neal Stephenson (available at Amazon, Borders)>, <Book: Ender's Game by Orson Scott Card (available at Collins Bookstore)>, <Book: Permutation City by Greg Egan (available at Angus and Robertson)>]"""
        )


class TestTicket11101(TransactionTestCase):

    def ticket_11101(self):
        management.call_command(
            'loaddata',
            'thingy.json',
            verbosity=0,
            commit=False
        )
        self.assertEqual(Thingy.objects.count(), 1)
        transaction.rollback()
        self.assertEqual(Thingy.objects.count(), 0)
        transaction.commit()

    @skipUnlessDBFeature('supports_transactions')
    def test_ticket_11101(self):
        """Test that fixtures can be rolled back (ticket #11101)."""
        ticket_11101 = transaction.commit_manually(self.ticket_11101)
        ticket_11101()