import logging
import time

from app.core.config import settings
from app.core.logging import configure_logging
from app.core.runtime import validate_runtime_settings
from app.db.session import SessionLocal, init_db
from app.services.service_control import ServiceControlService


logger = logging.getLogger("server_panel.worker")

def run_worker_loop() -> None:
    service = ServiceControlService()

    while True:
        try:
            with SessionLocal() as db:
                # The worker claims one pending action at a time so a second worker
                # cannot pick the same row after it has been moved to `running`.
                action = service.process_next_action(db)
            if action is None:
                time.sleep(settings.action_worker_poll_interval_seconds)
                continue

            logger.info(
                "Processed action id=%s status=%s target=%s",
                action.id,
                action.status,
                action.target_name,
            )
        except Exception:  # pragma: no cover - defensive top-level worker loop
            logger.exception("Worker loop iteration failed.")
            time.sleep(settings.action_worker_poll_interval_seconds)


def main() -> None:
    configure_logging()
    validate_runtime_settings(settings)
    init_db()
    logger.info("Starting action worker in %s mode.", settings.action_execution_mode)
    run_worker_loop()


if __name__ == "__main__":
    main()