"""Redis-backed cooperative signal helpers for WP sync job control.

Each running sync task polls these flags between post entries. Cancel and
pause are cooperative — the task exits cleanly rather than being forcibly
terminated, so already-synced posts are never lost.
"""
import redis

from app.utils.config import config_manager

CANCEL_FLAG_TTL_SECONDS = 300   # 5 min — outlasts any single task execution window
PAUSE_FLAG_TTL_SECONDS = 172_800  # 48 h — matches the job expiry window


def _redis_client() -> redis.Redis:
    return redis.from_url(config_manager.get_config().redis_url, decode_responses=True)


def _cancel_key(job_id: str) -> str:
    return f"wp_sync_cancel:{job_id}"


def _pause_key(job_id: str) -> str:
    return f"wp_sync_pause:{job_id}"


def set_cancel_flag(job_id: str) -> None:
    _redis_client().set(_cancel_key(job_id), "1", ex=CANCEL_FLAG_TTL_SECONDS)


def check_cancel_flag(job_id: str) -> bool:
    return bool(_redis_client().get(_cancel_key(job_id)))


def clear_cancel_flag(job_id: str) -> None:
    _redis_client().delete(_cancel_key(job_id))


def set_pause_flag(job_id: str) -> None:
    _redis_client().set(_pause_key(job_id), "1", ex=PAUSE_FLAG_TTL_SECONDS)


def check_pause_flag(job_id: str) -> bool:
    return bool(_redis_client().get(_pause_key(job_id)))


def clear_pause_flag(job_id: str) -> None:
    _redis_client().delete(_pause_key(job_id))