"""Redis ReliableQueue worker — F6 신뢰성 패턴 (BLMOVE + ack/fail + recovery).

queue:paused 가 set이면 대기 (task-watcher가 박재오 활동 감지 시 set).
string-based dispatch + getattr (테스트 patch 호환).
"""
from __future__ import annotations

import asyncio
import json
import logging
import os
import sys

import redis.asyncio as aioredis

from nas_client import webhook_update_task
from providers.gpt_image import run_gpt_image_generation
from providers.nano_banana import run_nano_banana_generation
from providers.flux import run_flux_generation
from _shared.reliable_queue import ReliableQueue

logger = logging.getLogger(__name__)

REDIS_URL = os.getenv("REDIS_URL", "redis://192.168.45.54:6379")
QUEUE_KEY = "queue:image-render"
PAUSED_KEY = "queue:paused"

# string names so `unittest.mock.patch` / `monkeypatch.setattr` on `worker.<name>`
# is correctly intercepted by getattr(sys.modules[__name__], ...)
_DISPATCH_TABLE = {
    "gpt_image_generation":   "run_gpt_image_generation",
    "nano_banana_generation": "run_nano_banana_generation",
    "flux_generation":        "run_flux_generation",
}


def _dispatch(payload: dict) -> None:
    """payload[job_type] → provider 함수 호출 (sync, worker_loop에서 asyncio.to_thread로 wrap)."""
    job_type = payload.get("job_type", "")
    task_id = payload.get("task_id", "")
    params = payload.get("params", {})
    fn_name = _DISPATCH_TABLE.get(job_type)
    if fn_name is None:
        logger.error("unknown job_type=%s task=%s", job_type, task_id)
        webhook_update_task(task_id, "failed", 0, "", error=f"unknown job_type: {job_type}")
        return
    try:
        fn = getattr(sys.modules[__name__], fn_name)
    except AttributeError:
        logger.error("dispatch table typo for job_type=%s name=%s task=%s", job_type, fn_name, task_id)
        webhook_update_task(task_id, "failed", 0, "", error=f"internal dispatch error: {fn_name}")
        return
    fn(task_id, params)


async def poll_once(queue: ReliableQueue) -> bool:
    """F6 — 1 cycle: dequeue → _dispatch → ack/fail. Returns True if a job handled."""
    result = await queue.dequeue(timeout=5)
    if result is None:
        return False
    payload, raw = result
    try:
        await asyncio.to_thread(_dispatch, payload)
    except Exception:
        logger.exception("dispatch unhandled exception task_id=%s",
                         payload.get("task_id"))
        await queue.fail(raw, payload)
        return True
    await queue.ack(raw)
    return True


async def worker_loop():
    redis = aioredis.from_url(REDIS_URL, decode_responses=False)
    queue = ReliableQueue(redis, queue_key=QUEUE_KEY)
    logger.info("image-render worker started worker_id=%s queue=%s",
                queue.worker_id, QUEUE_KEY)
    try:
        recovered = await queue.recover()
        if recovered:
            logger.info("recovered %d orphaned items at startup", recovered)
    except Exception:
        logger.exception("startup recover failed")

    while True:
        try:
            paused = await redis.get(PAUSED_KEY)
            if paused == b"1":
                await asyncio.sleep(10)
                continue
            await poll_once(queue)
        except asyncio.CancelledError:
            logger.info("worker_loop cancelled")
            raise
        except Exception:
            logger.exception("worker_loop iteration 실패, 5초 후 재시도")
            await asyncio.sleep(5)


if __name__ == "__main__":
    logging.basicConfig(level=logging.INFO)
    asyncio.run(worker_loop())