#!/usr/bin/env python

# python setup.py test
#   or
# runtests.py [tests.test_x tests.test_y.SomeTestCase ...]

from __future__ import print_function
import sys
from distutils.util import strtobool

import django
import os
import warnings
from django.conf import settings
from django.test.utils import get_runner


def setup_and_run_tests(test_labels=None):
    """Discover and run project tests. Returns number of failures."""
    test_labels = test_labels or ['tests']

    tags = envlist('ANYMAIL_ONLY_TEST')
    exclude_tags = envlist('ANYMAIL_SKIP_TESTS')

    # In automated testing, don't run live tests unless specifically requested
    if envbool('CONTINUOUS_INTEGRATION') and not envbool('RUN_LIVE_TESTS'):
        exclude_tags.append('live')

    if tags:
        print("Only running tests tagged: %r" % tags)
    if exclude_tags:
        print("Excluding tests tagged: %r" % exclude_tags)

    warnings.simplefilter('default')  # show DeprecationWarning and other default-ignored warnings

    # noinspection PyStringFormat
    os.environ['DJANGO_SETTINGS_MODULE'] = \
        'tests.test_settings.settings_%d_%d' % django.VERSION[:2]
    django.setup()

    TestRunner = get_runner(settings)
    test_runner = TestRunner(verbosity=1, tags=tags, exclude_tags=exclude_tags)
    return test_runner.run_tests(test_labels)


def runtests(test_labels=None):
    """Run project tests and exit"""
    # Used as setup test_suite: must either exit or return a TestSuite
    failures = setup_and_run_tests(test_labels)
    sys.exit(bool(failures))


def envbool(var, default=False):
    """Returns value of environment variable var as a bool, or default if not set.

    Converts `'true'` to `True`, and `'false'` to `False`.
    See :func:`~distutils.util.strtobool` for full list of allowable values.
    """
    val = os.getenv(var, None)
    if val is None:
        return default
    else:
        return strtobool(val)


def envlist(var):
    """Returns value of environment variable var split in a comma-separated list.

    Returns an empty list if variable is empty or not set.
    """
    val = os.getenv(var, "").split(',')
    if val == ['']:
        # "Splitting an empty string with a specified separator returns ['']"
        val = []
    return val


if __name__ == '__main__':
    runtests(test_labels=sys.argv[1:])