import asyncio
import logging

import httpx

logger = logging.getLogger(__name__)

MAX_RETRIES = 3
BASE_DELAY = 2.0


async def retry_with_backoff(coro_factory, max_retries: int = MAX_RETRIES):
    for attempt in range(max_retries + 1):
        try:
            resp = await coro_factory()
            if resp.status_code == 429:
                retry_after = resp.headers.get("Retry-After", str(BASE_DELAY * (2**attempt)))
                wait = float(retry_after)
                logger.warning("clickup rate limited (429), retry after %.1fs, attempt %d", wait, attempt + 1)
                await asyncio.sleep(wait)
                continue
            return resp
        except httpx.HTTPStatusError:
            if attempt < max_retries:
                await asyncio.sleep(BASE_DELAY * (2**attempt))
            else:
                raise
        except Exception:
            if attempt < max_retries:
                await asyncio.sleep(BASE_DELAY * (2**attempt))
            else:
                raise
    raise RuntimeError("clickup rate limit exceeded after max retries")