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# mypy: allow-untyped-defs
"""Discover and run std-library "unittest" style tests."""

from __future__ import annotations

from collections.abc import Callable
from collections.abc import Generator
from collections.abc import Iterable
from collections.abc import Iterator
from enum import auto
from enum import Enum
import inspect
import sys
import traceback
import types
from typing import TYPE_CHECKING
from typing import Union

import _pytest._code
from _pytest.compat import is_async_function
from _pytest.config import hookimpl
from _pytest.fixtures import FixtureRequest
from _pytest.monkeypatch import MonkeyPatch
from _pytest.nodes import Collector
from _pytest.nodes import Item
from _pytest.outcomes import exit
from _pytest.outcomes import fail
from _pytest.outcomes import skip
from _pytest.outcomes import xfail
from _pytest.python import Class
from _pytest.python import Function
from _pytest.python import Module
from _pytest.runner import CallInfo
import pytest


if sys.version_info[:2] < (3, 11):
    from exceptiongroup import ExceptionGroup

if TYPE_CHECKING:
    import unittest

    import twisted.trial.unittest


_SysExcInfoType = Union[
    tuple[type[BaseException], BaseException, types.TracebackType],
    tuple[None, None, None],
]


def pytest_pycollect_makeitem(
    collector: Module | Class, name: str, obj: object
) -> UnitTestCase | None:
    try:
        # Has unittest been imported?
        ut = sys.modules["unittest"]
        # Is obj a subclass of unittest.TestCase?
        # Type ignored because `ut` is an opaque module.
        if not issubclass(obj, ut.TestCase):  # type: ignore
            return None
    except Exception:
        return None
    # Is obj a concrete class?
    # Abstract classes can't be instantiated so no point collecting them.
    if inspect.isabstract(obj):
        return None
    # Yes, so let's collect it.
    return UnitTestCase.from_parent(collector, name=name, obj=obj)


class UnitTestCase(Class):
    # Marker for fixturemanger.getfixtureinfo()
    # to declare that our children do not support funcargs.
    nofuncargs = True

    def newinstance(self):
        # TestCase __init__ takes the method (test) name. The TestCase
        # constructor treats the name "runTest" as a special no-op, so it can be
        # used when a dummy instance is needed. While unittest.TestCase has a
        # default, some subclasses omit the default (#9610), so always supply
        # it.
        return self.obj("runTest")

    def collect(self) -> Iterable[Item | Collector]:
        from unittest import TestLoader

        cls = self.obj
        if not getattr(cls, "__test__", True):
            return

        skipped = _is_skipped(cls)
        if not skipped:
            self._register_unittest_setup_method_fixture(cls)
            self._register_unittest_setup_class_fixture(cls)
            self._register_setup_class_fixture()

        self.session._fixturemanager.parsefactories(self.newinstance(), self.nodeid)

        loader = TestLoader()
        foundsomething = False
        for name in loader.getTestCaseNames(self.obj):
            x = getattr(self.obj, name)
            if not getattr(x, "__test__", True):
                continue
            yield TestCaseFunction.from_parent(self, name=name)
            foundsomething = True

        if not foundsomething:
            runtest = getattr(self.obj, "runTest", None)
            if runtest is not None:
                ut = sys.modules.get("twisted.trial.unittest", None)
                if ut is None or runtest != ut.TestCase.runTest:
                    yield TestCaseFunction.from_parent(self, name="runTest")

    def _register_unittest_setup_class_fixture(self, cls: type) -> None:
        """Register an auto-use fixture to invoke setUpClass and
        tearDownClass (#517)."""
        setup = getattr(cls, "setUpClass", None)
        teardown = getattr(cls, "tearDownClass", None)
        if setup is None and teardown is None:
            return None
        cleanup = getattr(cls, "doClassCleanups", lambda: None)

        def process_teardown_exceptions() -> None:
            # tearDown_exceptions is a list set in the class containing exc_infos for errors during
            # teardown for the class.
            exc_infos = getattr(cls, "tearDown_exceptions", None)
            if not exc_infos:
                return
            exceptions = [exc for (_, exc, _) in exc_infos]
            # If a single exception, raise it directly as this provides a more readable
            # error (hopefully this will improve in #12255).
            if len(exceptions) == 1:
                raise exceptions[0]
            else:
                raise ExceptionGroup("Unittest class cleanup errors", exceptions)

        def unittest_setup_class_fixture(
            request: FixtureRequest,
        ) -> Generator[None]:
            cls = request.cls
            if _is_skipped(cls):
                reason = cls.__unittest_skip_why__
                raise pytest.skip.Exception(reason, _use_item_location=True)
            if setup is not None:
                try:
                    setup()
                # unittest does not call the cleanup function for every BaseException, so we
                # follow this here.
                except Exception:
                    cleanup()
                    process_teardown_exceptions()
                    raise
            yield
            try:
                if teardown is not None:
                    teardown()
            finally:
                cleanup()
                process_teardown_exceptions()

        self.session._fixturemanager._register_fixture(
            # Use a unique name to speed up lookup.
            name=f"_unittest_setUpClass_fixture_{cls.__qualname__}",
            func=unittest_setup_class_fixture,
            nodeid=self.nodeid,
            scope="class",
            autouse=True,
        )

    def _register_unittest_setup_method_fixture(self, cls: type) -> None:
        """Register an auto-use fixture to invoke setup_method and
        teardown_method (#517)."""
        setup = getattr(cls, "setup_method", None)
        teardown = getattr(cls, "teardown_method", None)
        if setup is None and teardown is None:
            return None

        def unittest_setup_method_fixture(
            request: FixtureRequest,
        ) -> Generator[None]:
            self = request.instance
            if _is_skipped(self):
                reason = self.__unittest_skip_why__
                raise pytest.skip.Exception(reason, _use_item_location=True)
            if setup is not None:
                setup(self, request.function)
            yield
            if teardown is not None:
                teardown(self, request.function)

        self.session._fixturemanager._register_fixture(
            # Use a unique name to speed up lookup.
            name=f"_unittest_setup_method_fixture_{cls.__qualname__}",
            func=unittest_setup_method_fixture,
            nodeid=self.nodeid,
            scope="function",
            autouse=True,
        )


class TestCaseFunction(Function):
    nofuncargs = True
    _excinfo: list[_pytest._code.ExceptionInfo[BaseException]] | None = None

    def _getinstance(self):
        assert isinstance(self.parent, UnitTestCase)
        return self.parent.obj(self.name)

    # Backward compat for pytest-django; can be removed after pytest-django
    # updates + some slack.
    @property
    def _testcase(self):
        return self.instance

    def setup(self) -> None:
        # A bound method to be called during teardown() if set (see 'runtest()').
        self._explicit_tearDown: Callable[[], None] | None = None
        super().setup()

    def teardown(self) -> None:
        if self._explicit_tearDown is not None:
            self._explicit_tearDown()
            self._explicit_tearDown = None
        self._obj = None
        del self._instance
        super().teardown()

    def startTest(self, testcase: unittest.TestCase) -> None:
        pass

    def _addexcinfo(self, rawexcinfo: _SysExcInfoType) -> None:
        rawexcinfo = _handle_twisted_exc_info(rawexcinfo)
        try:
            excinfo = _pytest._code.ExceptionInfo[BaseException].from_exc_info(
                rawexcinfo  # type: ignore[arg-type]
            )
            # Invoke the attributes to trigger storing the traceback
            # trial causes some issue there.
            _ = excinfo.value
            _ = excinfo.traceback
        except TypeError:
            try:
                try:
                    values = traceback.format_exception(*rawexcinfo)
                    values.insert(
                        0,
                        "NOTE: Incompatible Exception Representation, "
                        "displaying natively:\n\n",
                    )
                    fail("".join(values), pytrace=False)
                except (fail.Exception, KeyboardInterrupt):
                    raise
                except BaseException:
                    fail(
                        "ERROR: Unknown Incompatible Exception "
                        f"representation:\n{rawexcinfo!r}",
                        pytrace=False,
                    )
            except KeyboardInterrupt:
                raise
            except fail.Exception:
                excinfo = _pytest._code.ExceptionInfo.from_current()
        self.__dict__.setdefault("_excinfo", []).append(excinfo)

    def addError(
        self, testcase: unittest.TestCase, rawexcinfo: _SysExcInfoType
    ) -> None:
        try:
            if isinstance(rawexcinfo[1], exit.Exception):
                exit(rawexcinfo[1].msg)
        except TypeError:
            pass
        self._addexcinfo(rawexcinfo)

    def addFailure(
        self, testcase: unittest.TestCase, rawexcinfo: _SysExcInfoType
    ) -> None:
        self._addexcinfo(rawexcinfo)

    def addSkip(self, testcase: unittest.TestCase, reason: str) -> None:
        try:
            raise pytest.skip.Exception(reason, _use_item_location=True)
        except skip.Exception:
            self._addexcinfo(sys.exc_info())

    def addExpectedFailure(
        self,
        testcase: unittest.TestCase,
        rawexcinfo: _SysExcInfoType,
        reason: str = "",
    ) -> None:
        try:
            xfail(str(reason))
        except xfail.Exception:
            self._addexcinfo(sys.exc_info())

    def addUnexpectedSuccess(
        self,
        testcase: unittest.TestCase,
        reason: twisted.trial.unittest.Todo | None = None,
    ) -> None:
        msg = "Unexpected success"
        if reason:
            msg += f": {reason.reason}"
        # Preserve unittest behaviour - fail the test. Explicitly not an XPASS.
        try:
            fail(msg, pytrace=False)
        except fail.Exception:
            self._addexcinfo(sys.exc_info())

    def addSuccess(self, testcase: unittest.TestCase) -> None:
        pass

    def stopTest(self, testcase: unittest.TestCase) -> None:
        pass

    def addDuration(self, testcase: unittest.TestCase, elapsed: float) -> None:
        pass

    def runtest(self) -> None:
        from _pytest.debugging import maybe_wrap_pytest_function_for_tracing

        testcase = self.instance
        assert testcase is not None

        maybe_wrap_pytest_function_for_tracing(self)

        # Let the unittest framework handle async functions.
        if is_async_function(self.obj):
            testcase(result=self)
        else:
            # When --pdb is given, we want to postpone calling tearDown() otherwise
            # when entering the pdb prompt, tearDown() would have probably cleaned up
            # instance variables, which makes it difficult to debug.
            # Arguably we could always postpone tearDown(), but this changes the moment where the
            # TestCase instance interacts with the results object, so better to only do it
            # when absolutely needed.
            # We need to consider if the test itself is skipped, or the whole class.
            assert isinstance(self.parent, UnitTestCase)
            skipped = _is_skipped(self.obj) or _is_skipped(self.parent.obj)
            if self.config.getoption("usepdb") and not skipped:
                self._explicit_tearDown = testcase.tearDown
                setattr(testcase, "tearDown", lambda *args: None)

            # We need to update the actual bound method with self.obj, because
            # wrap_pytest_function_for_tracing replaces self.obj by a wrapper.
            setattr(testcase, self.name, self.obj)
            try:
                testcase(result=self)
            finally:
                delattr(testcase, self.name)

    def _traceback_filter(
        self, excinfo: _pytest._code.ExceptionInfo[BaseException]
    ) -> _pytest._code.Traceback:
        traceback = super()._traceback_filter(excinfo)
        ntraceback = traceback.filter(
            lambda x: not x.frame.f_globals.get("__unittest"),
        )
        if not ntraceback:
            ntraceback = traceback
        return ntraceback


@hookimpl(tryfirst=True)
def pytest_runtest_makereport(item: Item, call: CallInfo[None]) -> None:
    if isinstance(item, TestCaseFunction):
        if item._excinfo:
            call.excinfo = item._excinfo.pop(0)
            try:
                del call.result
            except AttributeError:
                pass

    # Convert unittest.SkipTest to pytest.skip.
    # This is actually only needed for nose, which reuses unittest.SkipTest for
    # its own nose.SkipTest. For unittest TestCases, SkipTest is already
    # handled internally, and doesn't reach here.
    unittest = sys.modules.get("unittest")
    if unittest and call.excinfo and isinstance(call.excinfo.value, unittest.SkipTest):
        excinfo = call.excinfo
        call2 = CallInfo[None].from_call(
            lambda: pytest.skip(str(excinfo.value)), call.when
        )
        call.excinfo = call2.excinfo


def _is_skipped(obj) -> bool:
    """Return True if the given object has been marked with @unittest.skip."""
    return bool(getattr(obj, "__unittest_skip__", False))


def pytest_configure() -> None:
    """Register the TestCaseFunction class as an IReporter if twisted.trial is available."""
    if _get_twisted_version() is not TwistedVersion.NotInstalled:
        from twisted.trial.itrial import IReporter
        from zope.interface import classImplements

        classImplements(TestCaseFunction, IReporter)


class TwistedVersion(Enum):
    """
    The Twisted version installed in the environment.

    We have different workarounds in place for different versions of Twisted.
    """

    # Twisted version 24 or prior.
    Version24 = auto()
    # Twisted version 25 or later.
    Version25 = auto()
    # Twisted version is not available.
    NotInstalled = auto()


def _get_twisted_version() -> TwistedVersion:
    # We need to check if "twisted.trial.unittest" is specifically present in sys.modules.
    # This is because we intend to integrate with Trial only when it's actively running
    # the test suite, but not needed when only other Twisted components are in use.
    if "twisted.trial.unittest" not in sys.modules:
        return TwistedVersion.NotInstalled

    import importlib.metadata

    import packaging.version

    version_str = importlib.metadata.version("twisted")
    version = packaging.version.parse(version_str)
    if version.major <= 24:
        return TwistedVersion.Version24
    else:
        return TwistedVersion.Version25


# Name of the attribute in `twisted.python.Failure` instances that stores
# the `sys.exc_info()` tuple.
# See twisted.trial support in `pytest_runtest_protocol`.
TWISTED_RAW_EXCINFO_ATTR = "_twisted_raw_excinfo"


@hookimpl(wrapper=True)
def pytest_runtest_protocol(item: Item) -> Iterator[None]:
    if _get_twisted_version() is TwistedVersion.Version24:
        import twisted.python.failure as ut

        # Monkeypatch `Failure.__init__` to store the raw exception info.
        original__init__ = ut.Failure.__init__

        def store_raw_exception_info(
            self, exc_value=None, exc_type=None, exc_tb=None, captureVars=None
        ):  # pragma: no cover
            if exc_value is None:
                raw_exc_info = sys.exc_info()
            else:
                if exc_type is None:
                    exc_type = type(exc_value)
                if exc_tb is None:
                    exc_tb = sys.exc_info()[2]
                raw_exc_info = (exc_type, exc_value, exc_tb)
            setattr(self, TWISTED_RAW_EXCINFO_ATTR, tuple(raw_exc_info))
            try:
                original__init__(
                    self, exc_value, exc_type, exc_tb, captureVars=captureVars
                )
            except TypeError:  # pragma: no cover
                original__init__(self, exc_value, exc_type, exc_tb)

        with MonkeyPatch.context() as patcher:
            patcher.setattr(ut.Failure, "__init__", store_raw_exception_info)
            return (yield)
    else:
        return (yield)


def _handle_twisted_exc_info(
    rawexcinfo: _SysExcInfoType | BaseException,
) -> _SysExcInfoType:
    """
    Twisted passes a custom Failure instance to `addError()` instead of using `sys.exc_info()`.
    Therefore, if `rawexcinfo` is a `Failure` instance, convert it into the equivalent `sys.exc_info()` tuple
    as expected by pytest.
    """
    twisted_version = _get_twisted_version()
    if twisted_version is TwistedVersion.NotInstalled:
        # Unfortunately, because we cannot import `twisted.python.failure` at the top of the file
        # and use it in the signature, we need to use `type:ignore` here because we cannot narrow
        # the type properly in the `if` statement above.
        return rawexcinfo  # type:ignore[return-value]
    elif twisted_version is TwistedVersion.Version24:
        # Twisted calls addError() passing its own classes (like `twisted.python.Failure`), which violates
        # the `addError()` signature, so we extract the original `sys.exc_info()` tuple which is stored
        # in the object.
        if hasattr(rawexcinfo, TWISTED_RAW_EXCINFO_ATTR):
            saved_exc_info = getattr(rawexcinfo, TWISTED_RAW_EXCINFO_ATTR)
            # Delete the attribute from the original object to avoid leaks.
            delattr(rawexcinfo, TWISTED_RAW_EXCINFO_ATTR)
            return saved_exc_info  # type:ignore[no-any-return]
        return rawexcinfo  # type:ignore[return-value]
    elif twisted_version is TwistedVersion.Version25:
        if isinstance(rawexcinfo, BaseException):
            import twisted.python.failure

            if isinstance(rawexcinfo, twisted.python.failure.Failure):
                tb = rawexcinfo.__traceback__
                if tb is None:
                    tb = sys.exc_info()[2]
                return type(rawexcinfo.value), rawexcinfo.value, tb

        return rawexcinfo  # type:ignore[return-value]
    else:
        # Ideally we would use assert_never() here, but it is not available in all Python versions
        # we support, plus we do not require `type_extensions` currently.
        assert False, f"Unexpected Twisted version: {twisted_version}"
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