import logging
import os
import sys

from importlib import import_module

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

os.environ["CELERY_CONFIG_MODULE"] = config_module
os.environ["CELERY_LOADER"] = "default"
os.environ["EVENTLET_NOPATCH"] = "yes"
os.environ["GEVENT_NOPATCH"] = "yes"

try:
    WindowsError = WindowsError
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:
    import_all_modules()
