"""CLI entrypoint to launch an RQ worker for STream3R jobs."""

from __future__ import annotations

import argparse
import logging
import os
from typing import Sequence

from rq import Queue, Worker

from .config import WorkerSettings
from .runtime import get_runtime


logger = logging.getLogger(__name__)


def _parse_args(default_queues: Sequence[str]) -> argparse.Namespace:
    parser = argparse.ArgumentParser(description="Run the STream3R RQ worker")
    parser.add_argument(
        "--queue",
        "--queues",
        dest="queues",
        action="append",
        help="Queue names to listen to (can be repeated)",
    )
    parser.add_argument(
        "--burst",
        action="store_true",
        help="Run in burst mode (exit when queues are empty)",
    )
    parser.add_argument(
        "--log-level",
        default="INFO",
        help="Logging level",
    )
    args = parser.parse_args()
    if not args.queues:
        args.queues = list(default_queues)
    return args


class Stream3RWorker(Worker):
    """RQ worker that enforces configured default timeouts before execution."""

    def __init__(self, *args, default_timeout: int | None = None, **kwargs) -> None:
        super().__init__(*args, **kwargs)
        self._default_timeout = default_timeout if default_timeout and default_timeout > 0 else None

    def _normalize_timeout(self, timeout_value: object) -> int | None:
        if timeout_value is None:
            return None
        try:
            return int(timeout_value)
        except (TypeError, ValueError):
            return None

    def execute_job(self, job, queue):  # type: ignore[override]
        if self._default_timeout is not None:
            current = self._normalize_timeout(getattr(job, "timeout", None))
            if current is None or current < self._default_timeout:
                job.timeout = self._default_timeout
        runtime = get_runtime()
        lock_ctx = runtime.gpu_lock()
        self.log.debug("Worker %s acquiring GPU lock for job %s", self.name, job.id)
        with lock_ctx:
            os.environ["STREAM3R_GPU_LOCK_HELD"] = "1"
            try:
                return super().execute_job(job, queue)
            finally:
                os.environ.pop("STREAM3R_GPU_LOCK_HELD", None)


def main() -> None:
    settings = WorkerSettings.from_env()
    if settings.default_job_timeout and settings.default_job_timeout > 0:
        Queue.DEFAULT_TIMEOUT = settings.default_job_timeout

    args = _parse_args([settings.pose_queue, settings.model_queue, settings.keyframe_queue])
    logging.basicConfig(level=getattr(logging, str(args.log_level).upper(), logging.INFO))

    runtime = get_runtime()

    queues = [Queue(name, connection=runtime.redis) for name in args.queues]
    if not queues:
        raise ValueError("No queues configured for worker")
    for queue in queues:
        logger.info("Listening on queue '%s'", queue.name)

    worker = Stream3RWorker(
        queues,
        connection=runtime.redis,
        name=settings.worker_name,
        default_timeout=settings.default_job_timeout,
    )
    worker.work(burst=args.burst)


if __name__ == "__main__":  # pragma: no cover
    main()