#!/usr/bin/env python

from os.path import dirname, basename
from importlib import import_module
import argparse
import os
import sys
import glob
import unittest
import logging


def load_tests_from_modules(names, template):
    loader = unittest.defaultTestLoader
    test_suites = []

    for name in names:
        module = import_module(template.format(name=name))
        test_suites.append(loader.loadTestsFromModule(module))

    return test_suites


def parse_args(available_bots):
    description = """
Script to run test_<bot_name>.py files in the
zulip_bot/zulip_bots/bots/<bot_name> directories.

Running tests for all bots:

./test-bots

Running tests for specific bots:

./test-bots define thesaurus

Running tests for all bots excluding certain bots (the
following command would run tests for all bots except
the tests for xkcd and wikipedia bots):

./test-bots --exclude xkcd wikipedia
"""
    parser = argparse.ArgumentParser(description=description)

    parser.add_argument('bots_to_test',
                        metavar='bot',
                        nargs='*',
                        default=available_bots,
                        help='specific bots to test (default is all)')

    parser.add_argument('--exclude',
                        metavar='bot',
                        nargs='*',
                        default=[],
                        help='bot(s) to exclude')
    return parser.parse_args()


def main():
    current_dir = os.path.dirname(os.path.abspath(__file__))
    bots_dir = os.path.join(current_dir, '..', 'zulip_bots/zulip_bots/bots')
    glob_pattern = bots_dir + '/*/test_*.py'
    test_modules = glob.glob(glob_pattern)

    # get only the names of bots that have tests
    available_bots = map(lambda path: basename(dirname(path)), test_modules)

    options = parse_args(available_bots)

    bots_to_test = filter(lambda bot: bot not in options.exclude,
                          options.bots_to_test)
    test_suites = load_tests_from_modules(
        bots_to_test,
        template='zulip_bots.bots.{name}.test_{name}'
    )

    suite = unittest.TestSuite(test_suites)
    runner = unittest.TextTestRunner(verbosity=2)
    result = runner.run(suite)
    if result.failures or result.errors:
        sys.exit(1)


if __name__ == '__main__':
    main()