# agent-office/tests/test_node_monitor.py
import json, pytest
from app import node_monitor

class FakeRedis:
    """worker heartbeat + queue llen + scan_iter 흉내."""
    def __init__(self, kv=None, lists=None):
        self._kv = kv or {}           # key(str) -> bytes
        self._lists = lists or {}     # key(str) -> length(int)
    async def get(self, key):
        return self._kv.get(key)
    async def llen(self, key):
        return self._lists.get(key, 0)
    async def scan_iter(self, match=None):
        prefix = match.rstrip("*")
        for k in list(self._lists):
            if k.startswith(prefix):
                yield k

def _hb(name, kind, state, **extra):
    return json.dumps({"name": name, "kind": kind, "state": state, "ts": "2026-06-29T00:00:00Z",
                       "last_job_at": None, "jobs_done": 0, "jobs_failed": 0, **extra}).encode()

@pytest.mark.asyncio
async def test_alive_worker_healthy_link():
    r = FakeRedis(kv={"worker:image-render:heartbeat": _hb("image-render","render","idle")})
    st = await node_monitor.collect_status(redis=r)
    img = next(w for w in st["workers"] if w["name"] == "image-render")
    assert img["alive"] is True and img["state"] == "idle"
    link = next(l for l in st["links"] if l["to"] == "image-render")
    assert link["status"] == "healthy" and link["type"] == "redis-queue"

@pytest.mark.asyncio
async def test_missing_heartbeat_is_dead_and_down():
    r = FakeRedis()  # heartbeat 없음
    st = await node_monitor.collect_status(redis=r)
    img = next(w for w in st["workers"] if w["name"] == "image-render")
    assert img["alive"] is False
    link = next(l for l in st["links"] if l["to"] == "image-render")
    assert link["status"] == "down"

@pytest.mark.asyncio
async def test_dead_letter_makes_degraded():
    r = FakeRedis(kv={"worker:video-render:heartbeat": _hb("video-render","render","idle")},
                  lists={"dead_letter:queue:video-render": 2})
    st = await node_monitor.collect_status(redis=r)
    vid = next(w for w in st["workers"] if w["name"] == "video-render")
    assert vid["dead_letter"] == 2
    link = next(l for l in st["links"] if l["to"] == "video-render")
    assert link["status"] == "degraded"

@pytest.mark.asyncio
async def test_paused_reason_from_watcher():
    r = FakeRedis(kv={"queue:paused": b"1",
                      "worker:task-watcher:heartbeat": _hb("task-watcher","watcher","trading",mode="trading")})
    st = await node_monitor.collect_status(redis=r)
    assert st["paused"] is True and st["paused_reason"] == "trading"

@pytest.mark.asyncio
async def test_trader_http_pull_link():
    r = FakeRedis(kv={"worker:ai_trade:heartbeat": _hb("ai_trade","trader","market_open")})
    st = await node_monitor.collect_status(redis=r)
    link = next(l for l in st["links"] if l["from"] == "ai_trade")
    assert link["type"] == "http-pull" and link["status"] == "healthy"

@pytest.mark.asyncio
async def test_paused_no_watcher_heartbeat_fallback_reason():
    """paused=True인데 watcher heartbeat 없으면 paused_reason == 'trading' 폴백."""
    r = FakeRedis(kv={"queue:paused": b"1"})  # watcher heartbeat 없음
    st = await node_monitor.collect_status(redis=r)
    assert st["paused"] is True
    assert st["paused_reason"] == "trading"

@pytest.mark.asyncio
async def test_processing_count_image_render():
    """processing:<queue>:<worker_id> 리스트가 있으면 processing 필드에 합산된다."""
    worker_id = "abc123"
    proc_key = f"processing:queue:image-render:{worker_id}"
    r = FakeRedis(
        kv={"worker:image-render:heartbeat": _hb("image-render", "render", "busy")},
        lists={proc_key: 3},
    )
    st = await node_monitor.collect_status(redis=r)
    img = next(w for w in st["workers"] if w["name"] == "image-render")
    assert img["processing"] == 3

@pytest.mark.asyncio
async def test_llen_exception_returns_redis_ok_false():
    """워커 루프 중 llen 예외 발생 시 예외를 전파하지 않고 redis_ok=False 반환 (Blocker 회귀)."""
    class BrokenLlenRedis(FakeRedis):
        async def llen(self, key):
            raise ConnectionError("Redis 연결 끊김")

    r = BrokenLlenRedis(
        kv={"worker:music-render:heartbeat": _hb("music-render", "render", "idle")}
    )
    st = await node_monitor.collect_status(redis=r)
    assert st["redis_ok"] is False


import app.node_monitor as nm

@pytest.mark.asyncio
async def test_alert_on_alive_to_dead(monkeypatch):
    sent = []
    async def fake_send_raw(text, **kw): sent.append(text); return {"ok": True}
    monkeypatch.setattr("app.telegram.messaging.send_raw", fake_send_raw)
    monkeypatch.setattr("app.db.add_log", lambda *a, **k: None)
    nm._node_state.clear(); nm._dl_notified.clear()
    alive = {"workers": [{"name":"image-render","alive":True,"dead_letter":0}], "links": []}
    dead =  {"workers": [{"name":"image-render","alive":False,"dead_letter":0}], "links": []}
    await nm.check_and_alert(status=alive)   # 첫 관측 — 경보 없음
    assert sent == []
    await nm.check_and_alert(status=dead)    # alive→dead 전이
    assert any("다운" in t for t in sent)

@pytest.mark.asyncio
async def test_alert_on_dead_letter_growth(monkeypatch):
    sent = []
    async def fake_send_raw(text, **kw): sent.append(text); return {"ok": True}
    monkeypatch.setattr("app.telegram.messaging.send_raw", fake_send_raw)
    monkeypatch.setattr("app.db.add_log", lambda *a, **k: None)
    nm._node_state.clear(); nm._dl_notified.clear()
    s = {"workers": [{"name":"video-render","alive":True,"dead_letter":2}], "links": []}
    await nm.check_and_alert(status=s)
    assert any("dead-letter" in t for t in sent)