"""Bot-specific rate limiter factory.

Keeps the bot entrypoint free of infra imports that would break the boundary
in tests/unit/test_bot_boundary.py. Redis is resolved lazily at runtime.
"""

from __future__ import annotations

from typing import Any

from ..core.logging import get_logger
from ..core.rate_limit import MemoryRateLimiter, RateLimiter

log = get_logger(__name__)


def _redis_client(url: str) -> Any:
    from ..core.redis_client import get_redis_client

    return get_redis_client(url)


async def get_rate_limiter(redis_url: str) -> RateLimiter:
    """Build a Redis rate limiter or fall back to memory on failure."""
    redis_client = _redis_client(redis_url)
    try:
        await redis_client.ping()
        from ..core.rate_limit import RedisRateLimiter

        log.info("rate_limiter_redis_ready")
        return RedisRateLimiter(redis_client)
    except Exception as exc:
        log.warning("rate_limiter_redis_unavailable", error=str(exc))
        try:
            await redis_client.aclose()
        except Exception:
            pass
        return MemoryRateLimiter()