from __future__ import annotations

from collections.abc import Iterable

from sqlalchemy import text
from sqlalchemy.ext.asyncio import AsyncSession


async def _acquire_key_lock(db: AsyncSession, lock_key: str) -> None:
    """PostgreSQL事务级 advisory lock；SQLite 本地调试环境无需额外锁。"""
    bind = db.get_bind()
    dialect_name = bind.dialect.name if bind is not None else ""
    if dialect_name == "postgresql":
        await db.execute(
            text("SELECT pg_advisory_xact_lock(hashtextextended(:lock_key, 0))"),
            {"lock_key": lock_key},
        )


async def acquire_user_credit_lock(db: AsyncSession, user_id: str) -> None:
    await _acquire_key_lock(db, f"credit:user:{user_id}")


async def acquire_team_business_lock(db: AsyncSession, team_id: str) -> None:
    await _acquire_key_lock(db, f"credit:team:{team_id}")


async def acquire_subscription_credit_lock(db: AsyncSession, subscription_id: str) -> None:
    await _acquire_key_lock(db, f"credit:subscription:{subscription_id}")


async def acquire_subscription_credit_locks(
    db: AsyncSession,
    subscription_ids: Iterable[str],
) -> None:
    for subscription_id in sorted({str(item) for item in subscription_ids if item}):
        await acquire_subscription_credit_lock(db, subscription_id)