"""运营配置读写。

get_value:业务读配置,DB 没有则 fallback 到 CONFIG_DEFS 默认(= 原 rewards 常量,空表行为不变)。
不缓存:配置读频率低(每次福利操作读一次,key 主键查极快),admin 改了立即生效、跨进程一致。
"""
from __future__ import annotations

from typing import Any

from sqlalchemy import select
from sqlalchemy.orm import Session

from app.core.config_schema import CONFIG_DEFS
from app.models.app_config import AppConfig


def get_value(db: Session, key: str) -> Any:
    """读配置值。DB 有用 DB,没有 fallback 到 CONFIG_DEFS 默认。未知 key 抛 KeyError。"""
    row = db.get(AppConfig, key)
    if row is not None:
        return row.value
    return CONFIG_DEFS[key]["default"]


def set_value(
    db: Session, key: str, value: Any, *, admin_id: int, commit: bool = True
) -> AppConfig:
    """写配置(admin 用)。未知 key 抛 KeyError。commit=False 让调用方与审计同事务。"""
    if key not in CONFIG_DEFS:
        raise KeyError(f"unknown config key: {key}")
    row = db.get(AppConfig, key)
    if row is None:
        row = AppConfig(key=key, value=value, updated_by_admin_id=admin_id)
        db.add(row)
    else:
        row.value = value
        row.updated_by_admin_id = admin_id
    if commit:
        db.commit()
        db.refresh(row)
    else:
        db.flush()
    return row


def list_all(db: Session) -> list[dict]:
    """所有可配项:default + 当前值(DB 有则用 DB) + 元信息。给 admin 配置页渲染。"""
    overrides = {r.key: r for r in db.execute(select(AppConfig)).scalars().all()}
    out: list[dict] = []
    for key, defn in CONFIG_DEFS.items():
        row = overrides.get(key)
        out.append(
            {
                "key": key,
                "label": defn["label"],
                "group": defn["group"],
                "type": defn["type"],
                "help": defn.get("help"),
                "default": defn["default"],
                "value": row.value if row is not None else defn["default"],
                "overridden": row is not None,
                "updated_at": row.updated_at.isoformat() if row is not None else None,
            }
        )
    return out