import os
import sys
import tempfile
from os.path import exists, join

import pytest
from django.conf import settings
from django.test import TestCase, override_settings

from oscar.core import customisation

VALID_FOLDER_PATH = 'tests/_site/apps'


class TestUtilities(TestCase):

    def test_subfolder_extraction(self):
        folders = list(customisation.subfolders('/var/www/eggs'))
        self.assertEqual(folders, ['/var', '/var/www', '/var/www/eggs'])


def test_raises_exception_for_nonexistant_app_label():
    with pytest.raises(ValueError):
        customisation.fork_app('sillytown', 'somefolder', 'sillytown')


def test_raises_exception_if_app_has_already_been_forked():
    # We piggyback on another test which means a custom app is already in
    # the apps directory we use for the test suite. We just check that's still
    # the case here.
    assert exists(join(VALID_FOLDER_PATH, 'partner'))
    with pytest.raises(ValueError):
        customisation.fork_app('partner', VALID_FOLDER_PATH, 'partner')


def test_creates_new_folder(tmpdir):
    path = tmpdir.mkdir('fork')
    customisation.fork_app('order', str(path), 'order')
    path.join('order').ensure_dir()


def test_creates_init_file(tmpdir):
    path = tmpdir.mkdir('fork')
    customisation.fork_app('order', str(path), 'order')

    path.join('order').join('__init__.py').ensure()


def test_handles_dashboard_app(tmpdir):
    # Dashboard apps are fiddly as they aren't identified by a single app
    # label.
    path = tmpdir.mkdir('fork')
    customisation.fork_app('catalogue_dashboard', str(path), 'dashboard.catalogue')
    # Check __init__.py created (and supporting folders)

    path.join('dashboard').join('catalogue').join('__init__.py').ensure()


def test_creates_models_and_admin_file(tmpdir):
    path = tmpdir.mkdir('fork')
    customisation.fork_app('order', str(path), 'order')
    for module, expected_string in [
        ('models', 'from oscar.apps.order.models import *'),
        ('admin', 'from oscar.apps.order.admin import *'),
        ('apps', 'OrderConfig')
    ]:
        filepath = path.join('order').join('%s.py' % module)
        filepath.ensure()
        contents = filepath.read()
        assert expected_string in contents


def test_copies_in_migrations_when_needed(tmpdir):
    path = tmpdir.mkdir('fork')
    for app, has_models in [('order', True), ('search', False)]:
        customisation.fork_app(app, str(path), app)

        native_migration_path = path.join(app).join('migrations')
        assert has_models == native_migration_path.check()


def test_dashboard_app_config(tmpdir, monkeypatch):
    path = tmpdir.mkdir('fork')
    customisation.fork_app('dashboard', str(path), 'dashboard')

    path.join('__init__.py').write('')
    monkeypatch.syspath_prepend(str(tmpdir))

    config_module = __import__(
        '%s.dashboard.apps' % path.basename, fromlist=['DashboardConfig']
    )

    assert hasattr(config_module, 'DashboardConfig')


class TestForkApp(TestCase):

    def setUp(self):
        self.original_paths = sys.path[:]
        sys.path.append('./tests/_site/')

    def tearDown(self):
        sys.path = self.original_paths

    def test_fork_third_party(self):
        tmpdir = tempfile.mkdtemp()
        installed_apps = list(settings.INSTALLED_APPS)
        installed_apps.append('thirdparty_package.apps.myapp')
        with override_settings(INSTALLED_APPS=installed_apps):
            customisation.fork_app('myapp', tmpdir, 'custom_myapp')
            forked_app_dir = join(tmpdir, 'custom_myapp')
            assert exists(forked_app_dir)
            assert exists(join(forked_app_dir, 'apps.py'))
            sys.path.append(tmpdir)

            config_module = __import__('custom_myapp.apps', fromlist=['CustomMyAppConfig'])
            assert hasattr(config_module, 'MyAppConfig')
            assert config_module.MyAppConfig.name.endswith('.custom_myapp')

    def test_absolute_target_path(self):
        tmpdir = tempfile.mkdtemp()
        customisation.fork_app('order', tmpdir, 'order')
        sys.path.append(tmpdir)
        config_module = __import__('order.apps', fromlist=['OrderConfig'])
        assert hasattr(config_module, 'OrderConfig')
        config_app_name = config_module.OrderConfig.name
        assert not config_app_name.startswith('.')

    def test_local_folder(self):
        tmpdir = tempfile.mkdtemp()
        os.chdir(tmpdir)
        customisation.fork_app('basket', '.', 'basket')
        sys.path.append(tmpdir)
        config_module = __import__('basket.apps', fromlist=['BasketConfig'])
        assert hasattr(config_module, 'BasketConfig')
        assert config_module.BasketConfig.name == 'basket'