# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project

import os
from contextlib import nullcontext
from multiprocessing import connection
from threading import Event
from types import SimpleNamespace

import pytest
import torch
import zmq

import vllm.platforms as platforms
from vllm.utils import torch_utils
from vllm.v1.engine import core as core_module
from vllm.v1.engine import utils as engine_utils
from vllm.v1.engine.core import EngineCoreProc, EngineShutdownState
from vllm.v1.engine.utils import (
    CoreEngine,
    CoreEngineLaunch,
    CoreEngineProcManager,
    EngineZmqAddresses,
    wait_for_engine_startup,
)
from vllm.v1.executor import UniProcExecutor, multiproc_executor

pytestmark = pytest.mark.skip_global_cleanup


@pytest.mark.parametrize(
    (
        "executor_class",
        "local_engine_count",
        "initial_threads",
        "user_threads",
        "fail_start",
        "expected",
    ),
    [
        (UniProcExecutor, 1, 192, None, False, (12, "12", "1")),
        (UniProcExecutor, 2, 192, None, False, (6, "6", "1")),
        (UniProcExecutor, 2, 192, None, True, (6, "6", "1")),
        (UniProcExecutor, 2, 5, None, False, (5, "5", "1")),
        (UniProcExecutor, 2, 1, None, False, (1, "1", "1")),
        (UniProcExecutor, 2, 5, "5", False, (5, "5", None)),
        (
            multiproc_executor.MultiprocExecutor,
            2,
            192,
            None,
            False,
            (192, None, None),
        ),
    ],
)
def test_engine_core_startup_threads_are_scoped_to_launch(
    monkeypatch: pytest.MonkeyPatch,
    executor_class,
    local_engine_count: int,
    initial_threads: int,
    user_threads: str | None,
    fail_start: bool,
    expected: tuple[int, str | None, str | None],
):
    """UniProc workers inherit their CPU share and restore the parent."""
    marker = torch_utils.OMP_NUM_THREADS_SET_BY_VLLM
    monkeypatch.delenv(marker, raising=False)
    monkeypatch.delenv("OMP_NUM_THREADS", raising=False)
    if user_threads is not None:
        monkeypatch.setenv("OMP_NUM_THREADS", user_threads)
    monkeypatch.setattr(torch_utils, "available_cpu_count", lambda: 12)
    platform = SimpleNamespace(
        is_cpu=lambda: False, is_cuda_alike=lambda: True, is_xpu=lambda: False
    )
    monkeypatch.setattr(engine_utils, "current_platform", platform)
    threads = SimpleNamespace(count=initial_threads)
    setter_calls = []

    def set_threads(count):
        setter_calls.append(count)
        threads.count = count

    monkeypatch.setattr(torch, "get_num_threads", lambda: threads.count)
    monkeypatch.setattr(torch, "set_num_threads", set_threads)
    start_states = []

    def thread_state():
        return (
            threads.count,
            os.environ.get("OMP_NUM_THREADS"),
            os.environ.get(marker),
        )

    def start_process():
        start_states.append(thread_state())
        if fail_start:
            raise RuntimeError("start failed")

    def get_context():
        assert thread_state() == (initial_threads, user_threads, None)
        return SimpleNamespace(
            Process=lambda **kwargs: SimpleNamespace(
                name=kwargs["name"],
                exitcode=1 if fail_start else None,
                start=start_process,
            )
        )

    monkeypatch.setattr(engine_utils, "get_mp_context", get_context)
    monkeypatch.setattr(engine_utils, "shutdown", lambda *_args, **_kwargs: None)
    monkeypatch.setattr(
        engine_utils.numa_utils,
        "configure_subprocess",
        lambda *args, **kwargs: nullcontext(),
    )
    with (
        pytest.raises(RuntimeError, match="start failed")
        if fail_start
        else nullcontext()
    ):
        manager = CoreEngineProcManager(
            local_engine_count=local_engine_count,
            start_index=0,
            local_start_index=0,
            vllm_config=SimpleNamespace(
                shutdown_timeout=0,
                parallel_config=SimpleNamespace(
                    data_parallel_size=local_engine_count,
                    assigned_physical_gpu_ids=None,
                    use_ray=False,
                ),
            ),
            local_client=True,
            handshake_address="unused",
            executor_class=executor_class,
            log_stats=False,
        )
        manager._finalizer.detach()
    assert start_states == [expected] * (1 if fail_start else local_engine_count)
    assert thread_state() == (initial_threads, user_threads, None)
    assert setter_calls == (
        [expected[0], initial_threads]
        if executor_class is UniProcExecutor and expected[0] < initial_threads
        else []
    )


@pytest.mark.parametrize(
    ("is_rocm", "request_timeout", "manager_timeout", "process_timeout"),
    [
        (True, 0, 0, 15.0),
        (True, 0, 7, 7),
        (True, 0, None, None),
        (False, 0, 0, 0),
        (True, 7, 0, 0),
    ],
)
def test_engine_core_process_shutdown_timeout(
    monkeypatch: pytest.MonkeyPatch,
    is_rocm: bool,
    request_timeout: float | None,
    manager_timeout: float | None,
    process_timeout: float | None,
):
    manager = object.__new__(CoreEngineProcManager)
    manager._request_shutdown_timeout = request_timeout
    manager.manager_stopped = Event()
    manager.processes = [object()]
    detach_results = iter((object(), None))
    manager._finalizer = SimpleNamespace(detach=lambda: next(detach_results))

    shutdown_calls = []
    monkeypatch.setattr(
        engine_utils,
        "current_platform",
        SimpleNamespace(is_rocm=lambda: is_rocm),
    )
    monkeypatch.setattr(
        engine_utils,
        "shutdown",
        lambda processes, timeout: shutdown_calls.append((processes, timeout)),
    )

    manager.shutdown(timeout=manager_timeout)
    manager.shutdown(timeout=manager_timeout)

    assert manager.manager_stopped.is_set()
    assert shutdown_calls == [(manager.processes, process_timeout)]


@pytest.mark.parametrize(
    (
        "is_rocm",
        "shutdown_state",
        "has_work",
        "shutdown_timeout",
        "exit_code",
        "expected_calls",
    ),
    [
        (
            True,
            EngineShutdownState.SHUTTING_DOWN,
            False,
            0,
            None,
            ["shutdown", "freeze"],
        ),
        (False, EngineShutdownState.SHUTTING_DOWN, False, 0, None, ["shutdown"]),
        (True, EngineShutdownState.RUNNING, False, 0, None, ["shutdown"]),
        (True, EngineShutdownState.SHUTTING_DOWN, True, 0, None, ["shutdown"]),
        (True, EngineShutdownState.SHUTTING_DOWN, False, 7, None, ["shutdown"]),
        (True, EngineShutdownState.SHUTTING_DOWN, False, 0, 1, ["shutdown"]),
    ],
)
def test_freeze_gc_after_clean_rocm_engine_core_shutdown(
    monkeypatch: pytest.MonkeyPatch,
    is_rocm: bool,
    shutdown_state: EngineShutdownState,
    has_work: bool,
    shutdown_timeout: int,
    exit_code: int | None,
    expected_calls: list[str],
):
    calls: list[str] = []
    vllm_config = SimpleNamespace(shutdown_timeout=shutdown_timeout)
    proc = SimpleNamespace(
        shutdown_state=EngineShutdownState.RUNNING,
        has_work=lambda: has_work,
        vllm_config=vllm_config,
    )

    def run_busy_loop():
        proc.shutdown_state = shutdown_state
        raise SystemExit(exit_code)

    proc.run_busy_loop = run_busy_loop
    proc.shutdown = lambda: calls.append("shutdown")
    parallel_config = SimpleNamespace(
        data_parallel_size=1,
        numa_bind=False,
        reconfigure_for_independent_dp_rank=lambda: None,
    )
    vllm_config.parallel_config = parallel_config

    for name in (
        "maybe_register_config_serialize_by_value",
        "set_process_title",
        "maybe_init_worker_tracer",
        "decorate_logs",
    ):
        monkeypatch.setattr(core_module, name, lambda *args, **kwargs: None)
    monkeypatch.setattr(core_module, "EngineCoreProc", lambda *args, **kwargs: proc)
    monkeypatch.setattr(
        core_module,
        "SignalCallback",
        lambda callback: SimpleNamespace(trigger=lambda: None, stop=lambda: None),
    )
    monkeypatch.setattr(core_module.signal, "signal", lambda *args: None)
    monkeypatch.setattr(
        platforms, "current_platform", SimpleNamespace(is_rocm=lambda: is_rocm)
    )
    monkeypatch.setattr(core_module.gc, "freeze", lambda: calls.append("freeze"))

    with pytest.raises(SystemExit):
        EngineCoreProc.run_engine_core(vllm_config=vllm_config)

    assert calls == expected_calls


class _FinishedProcess:
    name = "RustFrontend"

    def __init__(self, sentinel):
        self.sentinel = sentinel

    @property
    def exitcode(self):
        return 1


def test_wait_for_engine_startup_reports_watched_process_exit():
    ctx = zmq.Context()
    handshake_socket = ctx.socket(zmq.ROUTER)
    recv, send = connection.Pipe(duplex=False)
    send.close()

    parallel_config = SimpleNamespace(
        data_parallel_size_local=1,
        data_parallel_hybrid_lb=False,
        data_parallel_external_lb=False,
    )

    try:
        launch = CoreEngineLaunch(
            engine_manager=None,
            coordinator=None,
            addresses=EngineZmqAddresses(inputs=[], outputs=[]),
            tensor_queue=None,
        )
        launch.watched_frontend_processes = [_FinishedProcess(recv)]
        with pytest.raises(RuntimeError) as exc_info:
            wait_for_engine_startup(
                handshake_socket,
                [CoreEngine()],
                parallel_config,
                coordinated_dp=False,
                cache_config=None,
                launch=launch,
            )
    finally:
        recv.close()
        handshake_socket.close(linger=0)
        ctx.term()

    assert "Frontend process failed during engine core initialization" in str(
        exc_info.value
    )
    assert "Failed frontend proc(s): {'RustFrontend': 1}" in str(exc_info.value)