"""平台配置服务：system_configs 表 + Redis 缓存 60s（后台修改即时生效）"""
from typing import Any

import redis.asyncio as aioredis
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.models.common import SystemConfig

CACHE_KEY = "config:system"
CACHE_TTL = 60


async def get_all_configs(db: AsyncSession, redis: aioredis.Redis) -> dict[str, str]:
    """全量读取配置（Redis Hash 缓存 60s）"""
    cached = await redis.hgetall(CACHE_KEY)  # type: ignore[misc]
    if cached:
        return dict(cached)
    rows = (await db.execute(select(SystemConfig))).scalars().all()
    configs = {row.config_key: row.config_value for row in rows}
    if configs:
        await redis.hset(CACHE_KEY, mapping=configs)  # type: ignore[misc]
        await redis.expire(CACHE_KEY, CACHE_TTL)
    return configs


async def get_config(db: AsyncSession, redis: aioredis.Redis, key: str, default: Any = None) -> str | Any:
    """读取单个配置项"""
    configs = await get_all_configs(db, redis)
    return configs.get(key, default)


async def get_config_int(db: AsyncSession, redis: aioredis.Redis, key: str, default: int) -> int:
    value = await get_config(db, redis, key, None)
    try:
        return int(value) if value is not None else default
    except (TypeError, ValueError):
        return default


async def set_config(db: AsyncSession, redis: aioredis.Redis, key: str, value: str, admin_id: int | None = None) -> None:
    """写入配置并失效缓存（后台调用）"""
    row = await db.get(SystemConfig, key)
    if row is None:
        db.add(SystemConfig(config_key=key, config_value=value, updated_by=admin_id))
    else:
        row.config_value = value
        row.updated_by = admin_id
    await db.commit()
    await redis.delete(CACHE_KEY)