import faulthandler
import gc
import importlib
import io
import sys
import time
import traceback
import unittest

from _colorize import get_colors  # type: ignore[import-not-found]
from test import support
from test.support import threading_helper

from .filter import match_test
from .result import State, TestResult, TestStats
from .runtests import RunTests
from .save_env import saved_test_environment
from .setup import setup_tests
from .testresult import get_test_runner
from .parallel_case import ParallelTestCase
from .utils import (
    TestName,
    clear_caches, remove_testfn, abs_module_name, print_warning)


# Minimum duration of a test to display its duration or to mention that
# the test is running in background
PROGRESS_MIN_TIME = 30.0   # seconds


def run_unittest(test_mod, runtests: RunTests):
    loader = unittest.TestLoader()
    tests = loader.loadTestsFromModule(test_mod)

    for error in loader.errors:
        print(error, file=sys.stderr)
    if loader.errors:
        raise Exception("errors while loading tests")
    _filter_suite(tests, match_test)
    if runtests.parallel_threads:
        _parallelize_tests(tests, runtests.parallel_threads)
    return _run_suite(tests)

def _filter_suite(suite, pred):
    """Recursively filter test cases in a suite based on a predicate."""
    newtests = []
    for test in suite._tests:
        if isinstance(test, unittest.TestSuite):
            _filter_suite(test, pred)
            newtests.append(test)
