"""
database.py — Async PostgreSQL connection pool (asyncpg).
"""

from __future__ import annotations

import asyncpg

from core.settings import Settings

_pool: asyncpg.Pool | None = None


async def create_pool(settings: Settings) -> asyncpg.Pool:
    global _pool
    _pool = await asyncpg.create_pool(
        settings.database_url,
        min_size=settings.db_pool_min,
        max_size=settings.db_pool_max,
        command_timeout=60,
    )
    return _pool


async def get_pool() -> asyncpg.Pool:
    if _pool is None:
        raise RuntimeError('Database pool not initialised')
    return _pool


async def close_pool() -> None:
    global _pool
    if _pool:
        await _pool.close()
        _pool = None