"""Test configuration for the backend test suite.

Sets up sys.path and pre-mocks modules that would cause circular import
issues when unit-testing lightweight config/registry code in isolation.
"""

from __future__ import annotations

import importlib.util
import sys
from pathlib import Path
from types import SimpleNamespace
from unittest.mock import MagicMock

import pytest
from support.detectors.blocking_io import BlockingIOProbe, detect_blocking_io

# Make 'app' and 'deerflow' importable from any working directory
sys.path.insert(0, str(Path(__file__).parent.parent))
sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "scripts"))

_BACKEND_ROOT = Path(__file__).resolve().parents[1]
_blocking_io_probe = BlockingIOProbe(_BACKEND_ROOT)
_BLOCKING_IO_DETECTOR_ATTR = "_blocking_io_detector"

# Break the circular import chain that exists in production code:
#   deerflow.subagents.__init__
#     -> .executor (SubagentExecutor, SubagentResult)
#       -> deerflow.agents.thread_state
#         -> deerflow.agents.__init__
#           -> lead_agent.agent
#             -> subagent_limit_middleware
#               -> deerflow.subagents.executor  <-- circular!
#
# By injecting a mock for deerflow.subagents.executor *before* any test module
# triggers the import, __init__.py's "from .executor import ..." succeeds
# immediately without running the real executor module.
_executor_mock = MagicMock()
_executor_mock.SubagentExecutor = MagicMock
_executor_mock.SubagentResult = MagicMock
_executor_mock.SubagentStatus = MagicMock
_executor_mock.MAX_CONCURRENT_SUBAGENTS = 3
_executor_mock.get_background_task_result = MagicMock()

sys.modules["deerflow.subagents.executor"] = _executor_mock


@pytest.fixture()
def provisioner_module():
    """Load docker/provisioner/app.py as an importable test module.

    Shared by test_provisioner_kubeconfig and test_provisioner_pvc_volumes so
    that any change to the provisioner entry-point path or module name only
    needs to be updated in one place.
    """
    repo_root = Path(__file__).resolve().parents[2]
    module_path = repo_root / "docker" / "provisioner" / "app.py"
    spec = importlib.util.spec_from_file_location("provisioner_app_test", module_path)
    assert spec is not None
    assert spec.loader is not None
    module = importlib.util.module_from_spec(spec)
    spec.loader.exec_module(module)
    return module


@pytest.fixture()
def blocking_io_detector():
    """Fail a focused test if blocking calls run on the event loop thread."""
    with detect_blocking_io(fail_on_exit=True) as detector:
        yield detector


def pytest_addoption(parser: pytest.Parser) -> None:
    group = parser.getgroup("blocking-io")
    group.addoption(
        "--detect-blocking-io",
        action="store_true",
        default=False,
        help="Collect blocking calls made while an asyncio event loop is running and report a summary.",
    )
    group.addoption(
        "--detect-blocking-io-fail",
        action="store_true",
        default=False,
        help="Set a failing exit status when --detect-blocking-io records violations.",
    )


def pytest_configure(config: pytest.Config) -> None:
    config.addinivalue_line("markers", "no_blocking_io_probe: skip the optional blocking IO probe")


def pytest_sessionstart(session: pytest.Session) -> None:
    if _blocking_io_probe_enabled(session.config):
        _blocking_io_probe.clear()


@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_call(item: pytest.Item):
    if not _blocking_io_probe_enabled(item.config) or _blocking_io_probe_skipped(item):
        yield
        return

    detector = detect_blocking_io(fail_on_exit=False, stack_limit=18)
    detector.__enter__()
    setattr(item, _BLOCKING_IO_DETECTOR_ATTR, detector)
    yield


@pytest.hookimpl(hookwrapper=True)
def pytest_runtest_teardown(item: pytest.Item):
    yield

    detector = getattr(item, _BLOCKING_IO_DETECTOR_ATTR, None)
    if detector is None:
        return

    try:
        detector.__exit__(None, None, None)
        _blocking_io_probe.record(item.nodeid, detector.violations)
    finally:
        delattr(item, _BLOCKING_IO_DETECTOR_ATTR)


def pytest_sessionfinish(session: pytest.Session) -> None:
    if _blocking_io_fail_enabled(session.config) and _blocking_io_probe.violation_count and session.exitstatus == pytest.ExitCode.OK:
        session.exitstatus = pytest.ExitCode.TESTS_FAILED


def pytest_terminal_summary(terminalreporter: pytest.TerminalReporter) -> None:
    if not _blocking_io_probe_enabled(terminalreporter.config):
        return

    header, *details = _blocking_io_probe.format_summary().splitlines()
    terminalreporter.write_sep("=", header)
    for line in details:
        terminalreporter.write_line(line)


def _blocking_io_probe_enabled(config: pytest.Config) -> bool:
    return bool(config.getoption("--detect-blocking-io") or config.getoption("--detect-blocking-io-fail"))


def _blocking_io_fail_enabled(config: pytest.Config) -> bool:
    return bool(config.getoption("--detect-blocking-io-fail"))


def _blocking_io_probe_skipped(item: pytest.Item) -> bool:
    return item.path.name == "test_blocking_io_detector.py" or item.get_closest_marker("no_blocking_io_probe") is not None


# ---------------------------------------------------------------------------
# Auto-set user context for every test unless marked no_auto_user
# ---------------------------------------------------------------------------
#
# Repository methods read ``user_id`` from a contextvar by default
# (see ``deerflow.runtime.user_context``). Without this fixture, every
# pre-existing persistence test would raise RuntimeError because the
# contextvar is unset. The fixture sets a default test user on every
# test; tests that explicitly want to verify behaviour *without* a user
# context should mark themselves ``@pytest.mark.no_auto_user``.


@pytest.fixture(autouse=True)
def _reset_skill_storage_singleton():
    """Reset the SkillStorage singleton between tests to prevent cross-test contamination."""
    try:
        from deerflow.skills.storage import reset_skill_storage
    except ImportError:
        yield
        return
    reset_skill_storage()
    try:
        yield
    finally:
        reset_skill_storage()


@pytest.fixture(autouse=True)
def _auto_user_context(request):
    """Inject a default ``test-user-autouse`` into the contextvar.

    Opt-out via ``@pytest.mark.no_auto_user``. Uses lazy import so that
    tests which don't touch the persistence layer never pay the cost
    of importing runtime.user_context.
    """
    if request.node.get_closest_marker("no_auto_user"):
        yield
        return

    try:
        from deerflow.runtime.user_context import (
            reset_current_user,
            set_current_user,
        )
    except ImportError:
        yield
        return

    user = SimpleNamespace(id="test-user-autouse", email="test@local")
    token = set_current_user(user)
    try:
        yield
    finally:
        reset_current_user(token)