import asyncpg
from typing import Optional

from .config import settings

_pool: Optional[asyncpg.Pool] = None


async def get_pool() -> asyncpg.Pool:
    """Lazy-init the asyncpg pool. Reused across requests + background jobs."""
    global _pool
    if _pool is None:
        if not settings.database_url:
            raise RuntimeError("DATABASE_URL not configured")
        _pool = await asyncpg.create_pool(
            dsn=settings.database_url,
            min_size=2,
            max_size=10,
            command_timeout=30,
        )
    return _pool


async def close_pool() -> None:
    global _pool
    if _pool is not None:
        await _pool.close()
        _pool = None