from __future__ import absolute_import
from __future__ import with_statement

import logging
import os
import sys
import warnings

from importlib import import_module

config_module = os.environ.setdefault('CELERY_TEST_CONFIG_MODULE',
                                      'celery.tests.config')

os.environ.setdefault('CELERY_CONFIG_MODULE', config_module)
os.environ['CELERY_LOADER'] = 'default'
os.environ['EVENTLET_NOPATCH'] = 'yes'
os.environ['GEVENT_NOPATCH'] = 'yes'
os.environ['KOMBU_DISABLE_LIMIT_PROTECTION'] = 'yes'
os.environ['CELERY_BROKER_URL'] = 'memory://'

try:
    WindowsError = WindowsError  # noqa
except NameError:

    class WindowsError(Exception):
        pass


def teardown():
    # Don't want SUBDEBUG log messages at finalization.
    try:
        from multiprocessing.util import get_logger
    except ImportError:
        pass
    else:
        get_logger().setLevel(logging.WARNING)

    # Make sure test database is removed.
    import os
    if os.path.exists('test.db'):
        try:
            os.remove('test.db')
        except WindowsError:
            pass

    # Make sure there are no remaining threads at shutdown.
    import threading
    remaining_threads = [thread for thread in threading.enumerate()
                         if thread.getName() != 'MainThread']
    if remaining_threads:
        sys.stderr.write(
            '\n\n**WARNING**: Remaining threads at teardown: %r...\n' % (
                remaining_threads))


def find_distribution_modules(name=__name__, file=__file__):
    current_dist_depth = len(name.split('.')) - 1
    current_dist = os.path.join(os.path.dirname(file),
                                *([os.pardir] * current_dist_depth))
    abs = os.path.abspath(current_dist)
    dist_name = os.path.basename(abs)

    for dirpath, dirnames, filenames in os.walk(abs):
        package = (dist_name + dirpath[len(abs):]).replace('/', '.')
        if '__init__.py' in filenames:
            yield package
            for filename in filenames:
                if filename.endswith('.py') and filename != '__init__.py':
                    yield '.'.join([package, filename])[:-3]


def import_all_modules(name=__name__, file=__file__,
                       skip=['celery.decorators', 'celery.contrib.batches']):
    for module in find_distribution_modules(name, file):
        if module not in skip:
            try:
                import_module(module)
            except ImportError:
                pass


if os.environ.get('COVER_ALL_MODULES') or '--with-coverage3' in sys.argv:
    from celery.tests.utils import catch_warnings
    with catch_warnings(record=True):
        import_all_modules()
    warnings.resetwarnings()
