"""#1970 MuseTalk Flask 服务端 8 项工程 bug 修复单测.

覆盖 deploy/gpu_worker/musetalk_server.py（独立部署脚本，按文件路径动态加载）：
1. threaded=True 启动，/health 在推理阻塞时仍可达
2. fps 兜底：ffprobe 返回 0 或失败时使用 default_fps
3. ffmpeg 走 subprocess.run(check=True)，失败抛 RuntimeError
4. 并发锁：推理期间第二请求立即 503
5. 推理超时：超过 MUSE_INFERENCE_TIMEOUT 返回 504
6. 结果文件清理：临时目录在请求结束（成功/失败）后删除
7. 文件大小限制：超过限制返回 413，空文件返回 400
8. /cancel 端点：终止当前推理，清理临时文件
"""

from __future__ import annotations

import importlib.util
import io
import os
import shutil
import sys
import threading
import time
from pathlib import Path
from unittest import mock

import pytest

# 检查 Flask 是否可用（CI 环境可能没装）
try:
    import flask  # noqa: F401

    HAS_FLASK = True
except ImportError:
    HAS_FLASK = False

pytestmark = pytest.mark.skipif(not HAS_FLASK, reason="Flask 未安装（gpu_worker 独立部署依赖）")

ROOT = Path(__file__).resolve().parents[2]
SERVER_PATH = ROOT / "deploy" / "gpu_worker" / "musetalk_server.py"


def _load_server_module(name: str = "musetalk_server_test"):
    """加载 musetalk_server.py 为独立模块."""
    # 避免重复注册
    if name in sys.modules:
        del sys.modules[name]
    spec = importlib.util.spec_from_file_location(name, SERVER_PATH)
    mod = importlib.util.module_from_spec(spec)
    sys.modules[name] = mod
    spec.loader.exec_module(mod)
    return mod


@pytest.fixture
def server(tmp_path, monkeypatch):
    """加载一个干净的 musetalk_server 模块，使用独立临时目录和端口."""
    if not HAS_FLASK:
        pytest.skip("Flask 未安装（gpu_worker 独立部署依赖）")

    monkeypatch.setenv("MUSE_TEMP_DIR", str(tmp_path / "musetalk_temp"))
    monkeypatch.setenv("MUSE_PORT", "0")
    monkeypatch.setenv("MUSE_INFERENCE_TIMEOUT", "2")
    monkeypatch.setenv("MUSE_VIDEO_MAX_MB", "1")
    monkeypatch.setenv("MUSE_AUDIO_MAX_MB", "1")
    monkeypatch.setenv("MUSE_DEFAULT_FPS", "25.0")

    mod_name = f"musetalk_server_test_{os.getpid()}_{id(tmp_path)}"
    mod = _load_server_module(mod_name)

    # 确保配置已更新
    mod.Config.temp_dir = str(tmp_path / "musetalk_temp")
    mod.Config.inference_timeout = 2.0
    mod.Config.video_max_mb = 1
    mod.Config.audio_max_mb = 1
    mod.Config.default_fps = 25.0

    Path(mod.Config.temp_dir).mkdir(parents=True, exist_ok=True)

    # 重置全局状态
    mod.inference_lock = threading.Lock()
    mod.current_task = {"task_id": None, "process": None, "start_time": 0.0}

    return mod


# ── 1. Flask threaded=True ──────────────────────────────────────────


def test_flask_run_uses_threaded(server):
    """验证 app.run 调用时 threaded=True."""
    with mock.patch.object(server.app, "run") as mock_run:
        server.main()
        mock_run.assert_called_once()
        call_kwargs = mock_run.call_args
        assert call_kwargs.kwargs.get("threaded") is True


# ── 2. fps=0 兜底 ───────────────────────────────────────────────────


def test_get_video_fps_fallback_on_zero(server, tmp_path):
    """ffprobe 返回 0/1 时兜底为 default_fps."""
    fake_video = tmp_path / "fake.mp4"
    fake_video.write_bytes(b"fake")
    with mock.patch("subprocess.check_output", return_value=b"0/1"):
        fps = server._get_video_fps(fake_video)
        assert fps == 25.0


def test_get_video_fps_normal(server, tmp_path):
    """正常 fps 解析."""
    fake_video = tmp_path / "fake.mp4"
    fake_video.write_bytes(b"fake")
    with mock.patch("subprocess.check_output", return_value=b"30/1"):
        fps = server._get_video_fps(fake_video)
        assert abs(fps - 30.0) < 0.01


def test_get_video_fps_exception_fallback(server, tmp_path):
    """ffprobe 异常时兜底 default_fps."""
    fake_video = tmp_path / "fake.mp4"
    fake_video.write_bytes(b"fake")
    with mock.patch("subprocess.check_output", side_effect=Exception("no ffprobe")):
        fps = server._get_video_fps(fake_video)
        assert fps == 25.0


# ── 3. ffmpeg 错误检查 ──────────────────────────────────────────────


def test_run_ffmpeg_raises_on_nonzero_exit(server):
    """ffmpeg 返回非零应抛 RuntimeError."""
    import subprocess

    with mock.patch(
        "subprocess.run",
        side_effect=subprocess.CalledProcessError(1, "ffmpeg", stderr=b"decode error"),
    ):
        with pytest.raises(RuntimeError, match="ffmpeg 失败"):
            server._run_ffmpeg(["ffmpeg", "-i", "in", "out"])


def test_run_ffmpeg_raises_on_timeout(server):
    """ffmpeg 超时应抛 RuntimeError."""
    import subprocess

    with mock.patch("subprocess.run", side_effect=subprocess.TimeoutExpired("ffmpeg", 10)):
        with pytest.raises(RuntimeError, match="ffmpeg 超时"):
            server._run_ffmpeg(["ffmpeg", "-i", "in", "out"], timeout=10)


# ── 4. 并发锁 503 ──────────────────────────────────────────────────


def test_inference_returns_503_when_busy(server):
    """推理期间第二请求立即 503."""
    server.inference_lock.acquire()
    server.current_task["task_id"] = "task-busy"
    server.current_task["start_time"] = time.time()

    try:
        with server.app.test_client() as c:
            resp = c.post(
                "/inference",
                data={
                    "video": (io.BytesIO(b"v" * 100), "v.mp4"),
                    "audio": (io.BytesIO(b"a" * 100), "a.wav"),
                },
                content_type="multipart/form-data",
            )
            assert resp.status_code == 503
            assert resp.get_json()["status"] == "busy"
    finally:
        server.inference_lock.release()
        server.current_task = {"task_id": None, "process": None, "start_time": 0.0}


# ── 5. 推理超时 504 ─────────────────────────────────────────────────


def test_inference_timeout_returns_504(server):
    """推理超时返回 504."""

    def slow_inference(*args, **kwargs):
        time.sleep(10)  # 远超 2s 超时

    with mock.patch.object(server, "_run_inference", side_effect=slow_inference):
        with server.app.test_client() as c:
            resp = c.post(
                "/inference",
                data={
                    "video": (io.BytesIO(b"v" * 100), "v.mp4"),
                    "audio": (io.BytesIO(b"a" * 100), "a.wav"),
                },
                content_type="multipart/form-data",
            )
            assert resp.status_code == 504
            assert "超时" in resp.get_json()["error"]


# ── 6. 临时文件清理 ──────────────────────────────────────────────────


def test_temp_files_cleaned_after_success(server, tmp_path):
    """推理成功后临时目录被清理."""

    def fake_inference(video_path, audio_path, output_path):
        output_path.parent.mkdir(parents=True, exist_ok=True)
        output_path.write_bytes(b"v" * 2048)

    with mock.patch.object(server, "_run_inference", side_effect=fake_inference):
        with server.app.test_client() as c:
            resp = c.post(
                "/inference",
                data={
                    "video": (io.BytesIO(b"v" * 100), "v.mp4"),
                    "audio": (io.BytesIO(b"a" * 100), "a.wav"),
                    "task_id": "task-cleanup-ok",
                },
                content_type="multipart/form-data",
            )
            # send_file 返回 200 或推理异常 500
            assert resp.status_code in (200, 500)
            task_dir = Path(server.Config.temp_dir) / "task-cleanup-ok"
            assert not task_dir.exists(), f"临时目录 {task_dir} 应被清理"


def test_temp_files_cleaned_after_failure(server, tmp_path):
    """推理失败后临时目录也被清理."""

    def failing_inference(*args, **kwargs):
        raise RuntimeError("MuseTalk crash")

    with mock.patch.object(server, "_run_inference", side_effect=failing_inference):
        with server.app.test_client() as c:
            resp = c.post(
                "/inference",
                data={
                    "video": (io.BytesIO(b"v" * 100), "v.mp4"),
                    "audio": (io.BytesIO(b"a" * 100), "a.wav"),
                    "task_id": "task-cleanup-fail",
                },
                content_type="multipart/form-data",
            )
            assert resp.status_code == 500
            task_dir = Path(server.Config.temp_dir) / "task-cleanup-fail"
            assert not task_dir.exists()


# ── 7. 文件大小限制 ─────────────────────────────────────────────────


def test_oversize_video_returns_413(server):
    """视频超过大小限制返回 413."""
    big_video = b"v" * (2 * 1024 * 1024)  # 2MB > 1MB limit
    with server.app.test_client() as c:
        resp = c.post(
            "/inference",
            data={
                "video": (io.BytesIO(big_video), "v.mp4"),
                "audio": (io.BytesIO(b"a" * 100), "a.wav"),
            },
            content_type="multipart/form-data",
        )
        assert resp.status_code == 413
        assert "超过限制" in resp.get_json()["error"]


def test_empty_file_returns_400(server):
    """空文件返回 400."""
    with server.app.test_client() as c:
        resp = c.post(
            "/inference",
            data={
                "video": (io.BytesIO(b""), "v.mp4"),
                "audio": (io.BytesIO(b"a" * 100), "a.wav"),
            },
            content_type="multipart/form-data",
        )
        assert resp.status_code in (400, 413)
        assert "为空" in resp.get_json().get("error", "") or "超过限制" in resp.get_json().get("error", "")


def test_missing_file_returns_400(server):
    """缺少必要文件返回 400."""
    with server.app.test_client() as c:
        resp = c.post(
            "/inference",
            data={"video": (io.BytesIO(b"v" * 100), "v.mp4")},
            content_type="multipart/form-data",
        )
        assert resp.status_code == 400


# ── 8. /cancel 端点 ─────────────────────────────────────────────────


def test_cancel_no_running_task(server):
    """无任务时 /cancel 返回提示."""
    with server.app.test_client() as c:
        resp = c.post("/cancel")
        assert resp.status_code == 200
        assert "无正在运行" in resp.get_json()["message"]


def test_cancel_terminates_running_task(server, tmp_path):
    """有任务时 /cancel 清理临时目录并重置状态."""
    task_dir = Path(server.Config.temp_dir) / "task-cancel"
    task_dir.mkdir(parents=True, exist_ok=True)
    (task_dir / "some_file.txt").write_text("temp")

    server.current_task["task_id"] = "task-cancel"
    server.current_task["start_time"] = time.time()
    server.current_task["process"] = "inference_thread"

    with server.app.test_client() as c:
        resp = c.post("/cancel")
        assert resp.status_code == 200
        assert "已取消" in resp.get_json()["message"]
        assert not task_dir.exists()
        assert server.current_task["task_id"] is None
        assert server.current_task["process"] is None
        assert server.current_task["start_time"] == 0.0