import pytest

from pytest_django.lazy_django import get_django_version
from pytest_django_test.db_helpers import (
    db_exists,
    drop_database,
    mark_database,
    mark_exists,
    skip_if_sqlite_in_memory,
)


def test_db_reuse_simple(django_testdir):
    "A test for all backends to check that `--reuse-db` works."
    django_testdir.create_test_module(
        """
        import pytest

        from .app.models import Item

        @pytest.mark.django_db
        def test_db_can_be_accessed():
            assert Item.objects.count() == 0
    """
    )

    result = django_testdir.runpytest_subprocess("-v", "--reuse-db")
    assert result.ret == 0
    result.stdout.fnmatch_lines(["*test_db_can_be_accessed PASSED*"])


def test_db_order(django_testdir):
    """Test order in which tests are being executed."""

    django_testdir.create_test_module('''
        import pytest

        from .app.models import Item

        @pytest.mark.django_db(transaction=True)
        def test_run_second_decorator():
            pass

        def test_run_second_fixture(transactional_db):
            pass

        def test_run_first_fixture(db):
            pass

        @pytest.mark.django_db
        def test_run_first_decorator():
            pass
    ''')
    result = django_testdir.runpytest_subprocess('-v', '-s')
    assert result.ret == 0
    result.stdout.fnmatch_lines([
        "*test_run_first_fixture*",
        "*test_run_first_decorator*",
        "*test_run_second_decorator*",
        "*test_run_second_fixture*",
    ])


def test_db_reuse(django_testdir):
    """
    Test the re-use db functionality.
    """
    skip_if_sqlite_in_memory()

    django_testdir.create_test_module(
        """
        import pytest

        from .app.models import Item

        @pytest.mark.django_db
        def test_db_can_be_accessed():
            assert Item.objects.count() == 0
    """
    )

    # Use --create-db on the first run to make sure we are not just re-using a
    # database from another test run
    drop_database()
    assert not db_exists()

    # Do not pass in --create-db to make sure it is created when it
    # does not exist
    result_first = django_testdir.runpytest_subprocess("-v", "--reuse-db")
    assert result_first.ret == 0

    result_first.stdout.fnmatch_lines(["*test_db_can_be_accessed PASSED*"])

    assert not mark_exists()
    mark_database()
    assert mark_exists()

    result_second = django_testdir.runpytest_subprocess("-v", "--reuse-db")
    assert result_second.ret == 0
    result_second.stdout.fnmatch_lines(["*test_db_can_be_accessed PASSED*"])

    # Make sure the database has not been re-created
    assert mark_exists()

    result_third = django_testdir.runpytest_subprocess(
        "-v", "--reuse-db", "--create-db"
    )
    assert result_third.ret == 0
    result_third.stdout.fnmatch_lines(["*test_db_can_be_accessed PASSED*"])

    # Make sure the database has been re-created and the mark is gone
    assert db_exists()
    assert not mark_exists()


class TestSqlite:

    db_settings = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": "db_name",
            "TEST": {"NAME": "test_custom_db_name"},
        }
    }

    def test_sqlite_test_name_used(self, django_testdir):

        django_testdir.create_test_module(
            """
            import pytest
            from django.db import connections
            from django import VERSION

            @pytest.mark.django_db
            def test_a():
                (conn, ) = connections.all()

                assert conn.vendor == 'sqlite'
                print(conn.settings_dict)
                assert conn.settings_dict['NAME'] == 'test_custom_db_name'
        """
        )

        result = django_testdir.runpytest_subprocess("--tb=short", "-v")
        assert result.ret == 0
        result.stdout.fnmatch_lines(["*test_a*PASSED*"])


def test_xdist_with_reuse(django_testdir):
    pytest.importorskip("xdist")
    skip_if_sqlite_in_memory()

    drop_database("gw0")
    drop_database("gw1")

    django_testdir.create_test_module(
        """
        import pytest

        from .app.models import Item

        def _check(settings):
            # Make sure that the database name looks correct
            db_name = settings.DATABASES['default']['NAME']
            assert db_name.endswith('_gw0') or db_name.endswith('_gw1')

            assert Item.objects.count() == 0
            Item.objects.create(name='foo')
            assert Item.objects.count() == 1


        @pytest.mark.django_db
        def test_a(settings):
            _check(settings)


        @pytest.mark.django_db
        def test_b(settings):
            _check(settings)

        @pytest.mark.django_db
        def test_c(settings):
            _check(settings)

        @pytest.mark.django_db
        def test_d(settings):
            _check(settings)
    """
    )

    result = django_testdir.runpytest_subprocess("-vv", "-n2", "-s", "--reuse-db")
    assert result.ret == 0
    result.stdout.fnmatch_lines(["*PASSED*test_a*"])
    result.stdout.fnmatch_lines(["*PASSED*test_b*"])
    result.stdout.fnmatch_lines(["*PASSED*test_c*"])
    result.stdout.fnmatch_lines(["*PASSED*test_d*"])

    assert db_exists("gw0")
    assert db_exists("gw1")

    result = django_testdir.runpytest_subprocess("-vv", "-n2", "-s", "--reuse-db")
    assert result.ret == 0
    result.stdout.fnmatch_lines(["*PASSED*test_a*"])
    result.stdout.fnmatch_lines(["*PASSED*test_b*"])
    result.stdout.fnmatch_lines(["*PASSED*test_c*"])
    result.stdout.fnmatch_lines(["*PASSED*test_d*"])

    result = django_testdir.runpytest_subprocess(
        "-vv", "-n2", "-s", "--reuse-db", "--create-db"
    )
    assert result.ret == 0
    result.stdout.fnmatch_lines(["*PASSED*test_a*"])
    result.stdout.fnmatch_lines(["*PASSED*test_b*"])
    result.stdout.fnmatch_lines(["*PASSED*test_c*"])
    result.stdout.fnmatch_lines(["*PASSED*test_d*"])


class TestSqliteWithXdist:

    db_settings = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": "/tmp/should-not-be-used",
        }
    }

    def test_sqlite_in_memory_used(self, django_testdir):
        pytest.importorskip("xdist")

        django_testdir.create_test_module(
            """
            import pytest
            from django.db import connections

            @pytest.mark.django_db
            def test_a():
                (conn, ) = connections.all()

                assert conn.vendor == 'sqlite'
                db_name = conn.creation._get_test_db_name()
                assert 'file:memorydb' in db_name or db_name == ':memory:'
        """
        )

        result = django_testdir.runpytest_subprocess("--tb=short", "-vv", "-n1")
        assert result.ret == 0
        result.stdout.fnmatch_lines(["*PASSED*test_a*"])


class TestSqliteWithMultipleDbsAndXdist:

    db_settings = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": "/tmp/should-not-be-used",
        },
        "db2": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": "db_name",
            "TEST": {"NAME": "test_custom_db_name"},
        }
    }

    def test_sqlite_database_renamed(self, django_testdir):
        pytest.importorskip("xdist")

        django_testdir.create_test_module(
            """
            import pytest
            from django.db import connections

            @pytest.mark.django_db
            def test_a():
                (conn_db2, conn_default) = sorted(
                    connections.all(),
                    key=lambda conn: conn.alias,
                )

                assert conn_default.vendor == 'sqlite'
                db_name = conn_default.creation._get_test_db_name()

                # can_share_in_memory_db was removed in Django 2.1, and
                # used in _get_test_db_name before.
                if getattr(conn_default.features, "can_share_in_memory_db", True):
                    assert 'file:memorydb' in db_name
                else:
                    assert db_name == ":memory:"

                assert conn_db2.vendor == 'sqlite'
                db_name = conn_db2.creation._get_test_db_name()
                assert 'test_custom_db_name_gw' in db_name
        """
        )

        result = django_testdir.runpytest_subprocess("--tb=short", "-vv", "-n1")
        assert result.ret == 0
        result.stdout.fnmatch_lines(["*PASSED*test_a*"])


@pytest.mark.skipif(
    get_django_version() >= (1, 9),
    reason=(
        "Django 1.9 requires migration and has no concept of initial data fixtures"
    ),
)
def test_initial_data(django_testdir_initial):
    """Test that initial data gets loaded."""
    django_testdir_initial.create_test_module(
        """
        import pytest

        from .app.models import Item

        @pytest.mark.django_db
        def test_inner():
            assert [x.name for x in Item.objects.all()] \
                == ["mark_initial_data"]
    """
    )

    result = django_testdir_initial.runpytest_subprocess("--tb=short", "-v")
    assert result.ret == 0
    result.stdout.fnmatch_lines(["*test_inner*PASSED*"])


class TestNativeMigrations(object):
    """ Tests for Django Migrations """

    def test_no_migrations(self, django_testdir):
        django_testdir.create_test_module(
            """
            import pytest

            @pytest.mark.django_db
            def test_inner_migrations():
                from .app.models import Item
                Item.objects.create()
        """
        )

        migration_file = django_testdir.project_root.join(
            "tpkg/app/migrations/0001_initial.py"
        )
        assert migration_file.isfile()
        migration_file.write(
            'raise Exception("This should not get imported.")', ensure=True
        )

        result = django_testdir.runpytest_subprocess(
            "--nomigrations", "--tb=short", "-vv", "-s",
        )
        assert result.ret == 0
        assert "Operations to perform:" not in result.stdout.str()
        result.stdout.fnmatch_lines(["*= 1 passed in *"])

    def test_migrations_run(self, django_testdir):
        testdir = django_testdir
        testdir.create_test_module(
            """
            import pytest

            @pytest.mark.django_db
            def test_inner_migrations():
                from .app.models import Item
                Item.objects.create()
            """
        )

        testdir.create_app_file(
            """
            from django.db import migrations, models

            def print_it(apps, schema_editor):
                print("mark_migrations_run")

            class Migration(migrations.Migration):

                dependencies = []

                operations = [
                    migrations.CreateModel(
                        name='Item',
                        fields=[
                            ('id', models.AutoField(serialize=False,
                                                    auto_created=True,
                                                    primary_key=True)),
                            ('name', models.CharField(max_length=100)),
                        ],
                        options={
                        },
                        bases=(models.Model,),
                    ),
                    migrations.RunPython(
                        print_it,
                    ),
                ]
            """,
            "migrations/0001_initial.py",
        )
        result = testdir.runpytest_subprocess("--tb=short", "-v", "-s")
        assert result.ret == 0
        result.stdout.fnmatch_lines(["*mark_migrations_run*"])

        result = testdir.runpytest_subprocess(
            "--no-migrations", "--migrations", "--tb=short", "-v", "-s"
        )
        assert result.ret == 0
        result.stdout.fnmatch_lines(["*mark_migrations_run*"])
