"""#1970 GPU Worker 修复单测.

覆盖 deploy/gpu_worker/gpu_worker.py（独立部署脚本，不在 apps/packages 包内，
按文件路径动态加载）：
1. 默认配置：REQUEST_TIMEOUT=900 / TASK_MAX_RETRY=1 / 心跳 30s / 最短 3s；
2. 推理期心跳线程 POST /gpu/register 带 task_id，任务结束能停；
3. <3s 短视频直接上报失败，不调用 MuseTalk；
4. _call_musetalk 仅对 5xx/网络瞬时错误标记 retryable，4xx 不重试；
5. _handle_task 只对 retryable 错误本地重试 1 次。
"""

from __future__ import annotations

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

import pytest

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


def _load_worker_module():
    spec = importlib.util.spec_from_file_location("gpu_worker_standalone_1970", WORKER_PATH)
    mod = importlib.util.module_from_spec(spec)
    sys.modules[spec.name] = mod
    spec.loader.exec_module(mod)
    return mod


@pytest.fixture
def worker():
    return _load_worker_module()


# ── 默认配置 ───────────────────────────────────────────────────────


def test_config_defaults_900_and_retry_one(monkeypatch):
    """CI/本机若显式导出过这些 env，说明是运维覆盖，不应拿默认值断言；
    因此只在四个 env 全部缺失时校验脚本内置默认值（#1970：900/1/30/3）。"""
    keys = (
        "REQUEST_TIMEOUT",
        "TASK_MAX_RETRY",
        "TASK_HEARTBEAT_INTERVAL",
        "MIN_VIDEO_DURATION_SECONDS",
    )
    if any(k in os.environ for k in keys):
        pytest.skip("环境显式设置了 worker 超时/重试变量，跳过默认值断言")
    for key in keys:
        monkeypatch.delenv(key, raising=False)
    mod = _load_worker_module()
    assert mod.Config.request_timeout == 900.0
    assert mod.Config.task_max_retry == 1
    assert mod.Config.task_heartbeat_interval == 30.0
    assert mod.Config.min_video_duration_seconds == 3.0


# ── register 携带 task_id ──────────────────────────────────────────


def test_register_payload_includes_task_id_only_when_provided(worker, monkeypatch):
    captured = []

    class _Resp:
        status_code = 200

        def json(self):
            return {"worker_id": captured[-1]["worker_id"], "cancel_task": False}

    def _fake_post(url, json=None, headers=None, timeout=None):
        captured.append(json)
        return _Resp()

    monkeypatch.setattr(worker.requests, "post", _fake_post)
    monkeypatch.setattr(worker, "_check_musetalk_health", lambda: (True, {}))

    _ok, _cancel = worker._register("task-abc")
    assert _ok is True
    assert _cancel is False
    assert captured[-1]["task_id"] == "task-abc"
    assert captured[-1]["worker_id"]

    worker._register()  # 空闲心跳不带 task_id
    assert "task_id" not in captured[-1]


# ── 推理期心跳线程 ─────────────────────────────────────────────────


def test_task_heartbeat_thread_sends_and_stops(worker, monkeypatch):
    calls = []

    def _fake_register(task_id=None):
        calls.append(task_id)
        return True, False

    monkeypatch.setattr(worker, "_register", _fake_register)
    hb = worker.TaskHeartbeat("task-hb1", interval=5)
    hb.start()
    time.sleep(0.3)  # 启动后立即发一次
    hb.stop()
    hb.join(timeout=2)
    assert not hb.is_alive()
    assert calls and all(c == "task-hb1" for c in calls)


def test_task_heartbeat_cancel_calls_musetalk_cancel(worker, monkeypatch):
    """心跳响应 cancel_task=True → 调 _cancel_musetalk 并设置 cancelled 标志。"""
    cancel_calls = []

    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, True))
    monkeypatch.setattr(worker, "_cancel_musetalk", lambda: cancel_calls.append(1))

    hb = worker.TaskHeartbeat("task-cancel-1", interval=5)
    hb.start()
    hb.join(timeout=2)  # 检测到取消后线程自行 return
    assert not hb.is_alive()
    assert hb.cancelled is True
    assert cancel_calls == [1]


def test_handle_task_reports_cancelled_after_musetalk_abort(worker, monkeypatch):
    """推理被 /cancel 终止后，hb.cancelled=True → 上报失败而非重试。"""
    reports = []

    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, False))
    monkeypatch.setattr(worker, "_download", lambda url, path: True)
    monkeypatch.setattr(worker, "_probe_duration", lambda path: 12.0)
    # 模拟推理被终止（/inference 返回错误）
    monkeypatch.setattr(worker, "_call_musetalk", lambda v, a, o: (False, 0.0, "推理被取消", False))
    monkeypatch.setattr(
        worker,
        "_report_result",
        lambda task_id, success, duration=0.0, error_msg="": reports.append(error_msg) or True,
    )

    # 让 TaskHeartbeat 在主线程检查时报告已取消
    orig_hb_init = worker.TaskHeartbeat

    def _hb(task_id, interval):
        h = orig_hb_init(task_id, interval)
        h.cancelled = True
        return h

    monkeypatch.setattr(worker, "TaskHeartbeat", _hb)

    worker._handle_task({"task_id": "t-canceled", "video_url": "u", "audio_url": "u"})
    assert reports == ["用户取消任务"]


# ── 短视频前置拦截 ─────────────────────────────────────────────────


def test_handle_task_short_video_reports_failed_without_inference(worker, monkeypatch, tmp_path):
    video = tmp_path / "input.mp4"
    video.write_bytes(b"fake-mp4-bytes")
    audio = tmp_path / "input_audio.bin"
    audio.write_bytes(b"fake-audio")
    reports = []

    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, False))
    monkeypatch.setattr(worker, "_download", lambda url, path: True)
    # ffprobe 读出 1.2s → 低于 3s 阈值
    monkeypatch.setattr(worker, "_probe_duration", lambda path: 1.2)

    def _boom(*a, **k):
        raise AssertionError("短视频不应调用 MuseTalk 推理")

    monkeypatch.setattr(worker, "_call_musetalk", _boom)
    monkeypatch.setattr(
        worker,
        "_report_result",
        lambda task_id, success, duration=0.0, error_msg="": reports.append((task_id, success, error_msg)) or True,
    )

    task = {
        "task_id": "task-short",
        "video_url": "https://example.com/v.mp4",
        "audio_url": "https://example.com/a.bin",
    }
    worker._handle_task(task)

    assert len(reports) == 1
    tid, ok, err = reports[0]
    assert tid == "task-short"
    assert ok is False
    assert "视频过短" in err
    assert "3" in err


def test_handle_task_probe_failure_does_not_block(worker, monkeypatch):
    """ffprobe 不可用（duration=0.0）时不能误杀，应继续推理."""
    reports = []
    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, False))
    monkeypatch.setattr(worker, "_download", lambda url, path: True)
    monkeypatch.setattr(worker, "_probe_duration", lambda path: 0.0)
    monkeypatch.setattr(
        worker,
        "_call_musetalk",
        lambda v, a, o: (True, 8.0, "", False),
    )
    uploaded = []
    monkeypatch.setattr(
        worker,
        "_report_success_with_file",
        lambda task_id, duration, path: uploaded.append((task_id, duration)),
    )
    monkeypatch.setattr(worker, "_report_result", lambda *a, **k: True)

    worker._handle_task({"task_id": "task-probe0", "video_url": "u", "audio_url": "u"})
    assert uploaded == [("task-probe0", 8.0)]
    assert reports == []


# ── 重试语义：仅瞬时错误重试 ───────────────────────────────────────


def test_call_musetalk_4xx_not_retryable_5xx_retryable(worker, monkeypatch, tmp_path):
    video = tmp_path / "v.mp4"
    audio = tmp_path / "a.bin"
    video.write_bytes(b"v")
    audio.write_bytes(b"a")
    out = tmp_path / "o.mp4"

    class _Resp:
        def __init__(self, code, body=b"x" * 2048):
            self.status_code = code
            self.content = body
            self.text = "err"

    # 4xx：确定性失败，不重试
    monkeypatch.setattr(worker.requests, "post", lambda *a, **k: _Resp(400))
    ok, _, _, retryable = worker._call_musetalk(video, audio, out)
    assert ok is False and retryable is False

    monkeypatch.setattr(worker.requests, "post", lambda *a, **k: _Resp(503))
    ok, _, _, retryable = worker._call_musetalk(video, audio, out)
    assert ok is False and retryable is True

    # 连接异常：瞬时错误，可重试
    import requests as _requests

    def _conn_err(*a, **k):
        raise _requests.exceptions.ConnectionError("reset")

    monkeypatch.setattr(worker.requests, "post", _conn_err)
    ok, _, _, retryable = worker._call_musetalk(video, audio, out)
    assert ok is False and retryable is True


def test_handle_task_retries_once_for_transient_then_succeeds(worker, monkeypatch):
    calls = []

    def _fake_call(v, a, o):
        calls.append(1)
        if len(calls) == 1:
            return False, 0.0, "MuseTalk HTTP 503: busy", True
        return True, 6.5, "", False

    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, False))
    monkeypatch.setattr(worker, "_download", lambda url, path: True)
    monkeypatch.setattr(worker, "_probe_duration", lambda path: 12.0)
    monkeypatch.setattr(worker, "_call_musetalk", _fake_call)
    monkeypatch.setattr(worker, "time", mock.MagicMock())  # 重试 sleep 立即返回
    uploaded = []
    monkeypatch.setattr(
        worker,
        "_report_success_with_file",
        lambda task_id, duration, path: uploaded.append((task_id, duration)),
    )

    worker._handle_task({"task_id": "t-retry", "video_url": "u", "audio_url": "u"})
    assert len(calls) == 2
    assert uploaded == [("t-retry", 6.5)]


def test_handle_task_no_retry_for_deterministic_failure(worker, monkeypatch):
    calls = []

    def _fake_call(v, a, o):
        calls.append(1)
        return False, 0.0, "MuseTalk HTTP 400: bad input", False

    reports = []
    monkeypatch.setattr(worker, "_register", lambda *a, **k: (True, False))
    monkeypatch.setattr(worker, "_download", lambda url, path: True)
    monkeypatch.setattr(worker, "_probe_duration", lambda path: 12.0)
    monkeypatch.setattr(worker, "_call_musetalk", _fake_call)
    monkeypatch.setattr(
        worker,
        "_report_result",
        lambda task_id, success, duration=0.0, error_msg="": reports.append(error_msg) or True,
    )

    worker._handle_task({"task_id": "t-4xx", "video_url": "u", "audio_url": "u"})
    assert len(calls) == 1  # 4xx 本地不重试，直接交服务端决定
    assert reports and "400" in reports[0]