#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import argparse
import functools
import os
import sys
import unittest
from fnmatch import fnmatchcase

import system_tests


class MyTestLoader(unittest.TestLoader):
    testNamePatterns = None

    def getTestCaseNames(self, testCaseClass):
        """
        Customize this code to allow you to filter test methods through testNamePatterns.
        """
        def shouldIncludeMethod(attrname):
            if not attrname.startswith(self.testMethodPrefix):
                return False
            testFunc = getattr(testCaseClass, attrname)
            if not callable(testFunc):
                return False
            return self.testNamePatterns is None or \
                 any(fnmatchcase(attrname, pattern) for pattern in self.testNamePatterns)

        testFnNames = list(filter(shouldIncludeMethod, dir(testCaseClass)))
        if self.sortTestMethodsUsing:
            testFnNames.sort(key=functools.cmp_to_key(self.sortTestMethodsUsing))
        return testFnNames


if __name__ == '__main__':
    parser = argparse.ArgumentParser(description="The system test suite")
    parser.add_argument(
        "--config_file",
        type=str,
        nargs=1,
        help="Path to the suite's configuration file",
        default=['suite.conf']
    )
    parser.add_argument(
        "--verbose", "-v",
        action='count',
        help="verbosity level",
        default=1
    )
    parser.add_argument(
        "--debug",
        help="enable debugging output",
        action='store_true'
    )
    parser.add_argument(
        "dir_or_file",
        help="root directory under which the testsuite searches for tests or a"
        "single file which tests are run (defaults to the config file's"
        "location)",
        default=None,
        type=str,
        nargs='?'
    )

    args          = parser.parse_args()
    if 'VERBOSE' in os.environ:
        args.verbose = 2
    conf_file     = args.config_file[0]
    DEFAULT_ROOT  = os.path.abspath(os.path.dirname(conf_file))
    system_tests.set_debug_mode(args.debug)
    system_tests.configure_suite(conf_file)

    testLoader = MyTestLoader()
    testLoader.testMethodPrefix = ''
    testLoader.testNamePatterns = ['test*', '*test']
    if args.dir_or_file is None or os.path.isdir(args.dir_or_file):
        discovered_tests = testLoader.discover(
            args.dir_or_file or DEFAULT_ROOT
        )
    elif os.path.isfile(args.dir_or_file):
        discovered_tests = testLoader.discover(
            os.path.dirname(args.dir_or_file),
            pattern=os.path.split(args.dir_or_file)[1],
        )
    else:
        print(
            "WARNING: Invalid search location, falling back to {!s}"
            .format(DEFAULT_ROOT),
            file=sys.stderr
        )
        discovered_tests = testLoader.discover(
            DEFAULT_ROOT
        )

    test_res = unittest.runner.TextTestRunner(verbosity=args.verbose)\
                              .run(discovered_tests)

    sys.exit(0 if len(test_res.failures) + len(test_res.errors) == 0 else 1)