"""
内嵌 MQTT Broker 宿主级分布式锁 + 孤儿接管测试

验证 setup_mqtt_broker 用 chongming-cache DistruibutedLock 取代文件锁后的语义：
  1. 外部 Broker（use_embedded_broker=false）→ 跳过锁，直接返回
  2. 未配置共享 cache → 无法取锁，跳过（并给出警告）
  3. 非持有者：锁被他人持有 → 等待期间端口已就绪即复用，不启动子进程
  4. 持有者 & 端口空闲 → 启动子进程并登记 PID
  5. 持有者 & 端口被占 & 无孤儿登记 → 复用（不托管、不杀进程）
  6. 持有者 & 端口被占 & 孤儿 PID 存活 → 终止孤儿、接管重启、登记新 PID
  7. 关停 → 终止子进程、释放锁、清理登记

通过 monkeypatch is_port_in_use / _pid_alive / _terminate_pid / _wait_port_free 隔离
真实端口与进程；子进程目标替换为休眠桩，验证编排逻辑而非真实 amqtt 收发。

运行: uv run python test/test_mqtt_broker_lock.py
"""
import asyncio
import sys
import tempfile
import time
from pathlib import Path
from types import SimpleNamespace

_HERE = Path(__file__).resolve().parent          # chongming-zenoh/
_PROJ = _HERE
for _p in (_PROJ / "src", _PROJ / "utils" / "worker" / "src"):
    sys.path.insert(0, str(_p))

import chongming.app.core.lifespan_setup as ls
from chongming_cache import Cache, DistributedLock

failures = []


def check(name, cond, detail=""):
    status = "PASS" if cond else "FAIL"
    print(f"[{status}] {name}" + (f" — {detail}" if detail else ""))
    if not cond:
        failures.append(name)


def _dummy_broker(*_a, **_k):
    """休眠桩子进程，替代真实 amqtt Broker（验证编排，不做 MQTT 收发）。"""
    time.sleep(60)


def make_manager(cache):
    return SimpleNamespace(cache=cache)


def make_app():
    return SimpleNamespace(state=SimpleNamespace(
        mqtt_broker_process=None, mqtt_broker_lock=None,
        mqtt_broker_lock_acquired=False,
    ))


def _port_script(*seq):
    """一次性的 is_port_in_use 脚本（耗尽后一律 True，防止等待循环无限跑）。"""
    it = iter(seq)

    def fake(port, host="127.0.0.1"):
        try:
            return next(it)
        except StopIteration:
            return True
    return fake


async def run_setup(cache, conf, port_script, patch=()):
    """用给定配置跑一遍 setup_mqtt_broker，返回 app。"""
    ls.env = "testenv"
    ls.config = {"testenv": {"mqtt": conf}}
    ls._run_mqtt_broker = _dummy_broker
    ls.is_port_in_use = port_script
    ls._pid_alive = lambda pid: True
    ls._terminate_pid = lambda pid: None
    ls._wait_port_free = lambda *a, **k: None
    for name, val in patch:
        setattr(ls, name, val)
    app = make_app()
    mgr = make_manager(cache)
    await ls.setup_mqtt_broker(app, mgr)
    return app


async def main():
    c = Cache(backend="diskcache", cache_store_path=tempfile.mkdtemp())
    base = {"enabled": True, "host": "127.0.0.1", "port": 18883,
            "use_embedded_broker": True}

    # ── 1. 外部 Broker：跳过 ────────────────────────────────
    ext = dict(base, use_embedded_broker=False)
    app = await run_setup(c, ext, _port_script(False))
    check("1.1 外部 Broker 跳过（不启动）", app.state.mqtt_broker_process is None
          and app.state.mqtt_broker_lock is None)

    # ── 2. 未配 cache：跳过 ─────────────────────────────────
    app = await run_setup(None, base, _port_script(False))
    check("2.1 未配 cache 跳过（不取锁）", app.state.mqtt_broker_lock is None
          and app.state.mqtt_broker_process is None)

    # ── 3. 非持有者：锁被他人持有 → 已监听则复用 ────────────
    actor_lock = DistributedLock(c, ls._broker_lock_key())   # 先被别人抢到
    actor_lock.acquire()
    app = await run_setup(c, base, _port_script(True))        # 端口已被"占用"
    check("3.1 非持有者复用（不取锁、不启动）",
          app.state.mqtt_broker_lock is None
          and app.state.mqtt_broker_process is None)
    await actor_lock.stop()
    actor_lock.release()

    # ── 4. 持有者 & 端口空闲 → 启动并登记 PID ──────────────
    app = await run_setup(c, base, _port_script(False, True))
    check("4.1 持锁启动子进程", app.state.mqtt_broker_process is not None)
    check("4.2 已登记子进程 PID",
          c.get(ls._broker_owner_key()) == str(app.state.mqtt_broker_process.pid))
    await ls.shutdown_mqtt_broker(app)
    check("4.3 关停后释放锁", app.state.mqtt_broker_lock is None)
    check("4.4 关停后清理登记", c.get(ls._broker_owner_key()) is None)

    # ── 5. 持有者 & 端口被占 & 无孤儿登记 → 复用 ───────────
    app = await run_setup(c, base, _port_script(True))
    check("5.1 端口被占无孤儿：复用（不托管不杀）",
          app.state.mqtt_broker_process is None
          and app.state.mqtt_broker_lock is not None)
    await ls.shutdown_mqtt_broker(app)
    check("5.2 复用路径关停释放锁", app.state.mqtt_broker_lock is None)

    # ── 6. 持有者 & 端口被占 & 孤儿 PID 存活 → 终止并接管 ──
    #    端口脚本：入口=占用(True) → 终止后=空闲(False) → 新进程监听(True)
    c.set(ls._broker_owner_key(), "99999")        # 模拟前任登记的孤儿 PID
    terminated = []
    app = await run_setup(
        c, base, _port_script(True, False, True),
        patch=[("_pid_alive", lambda pid: pid == 99999),
               ("_terminate_pid", lambda pid: terminated.append(pid))],
    )
    check("6.1 检出并终止孤儿 PID 99999", 99999 in terminated, detail=f"{terminated}")
    check("6.2 接管后启动并登记新 PID",
          app.state.mqtt_broker_process is not None
          and c.get(ls._broker_owner_key()) == str(app.state.mqtt_broker_process.pid))
    await ls.shutdown_mqtt_broker(app)
    check("6.3 接管后关停释放并清理", app.state.mqtt_broker_lock is None
          and c.get(ls._broker_owner_key()) is None)

    c.close()
    print()
    if failures:
        print(f"FAILED {len(failures)}: {failures}")
        return 1
    print("ALL PASS")
    return 0


if __name__ == "__main__":
    sys.exit(asyncio.run(main()))