"""FastAPI 认证依赖注入"""

from fastapi import Depends, HTTPException, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials
from sqlalchemy import select

from app.core.auth import decode_access_token
from app.db.database import get_db
from app.db.tables import users_table

security = HTTPBearer()


async def get_current_user(
    credentials: HTTPAuthorizationCredentials = Depends(security),
) -> dict:
    """从 Authorization Bearer token 提取并验证用户"""
    payload = decode_access_token(credentials.credentials)
    if payload is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Token 无效或已过期",
            headers={"WWW-Authenticate": "Bearer"},
        )

    user_id = payload.get("sub")
    if user_id is None:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Token 格式错误",
        )

    async with get_db() as db:
        result = await db.execute(
            select(users_table).where(users_table.c.id == int(user_id))
        )
        user = result.mappings().first()

    if user is None or not user["is_active"]:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="用户不存在或已禁用",
        )

    return dict(user)


async def get_current_admin(
    current_user: dict = Depends(get_current_user),
) -> dict:
    """要求管理员角色"""
    if current_user["role"] != "admin":
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="需要管理员权限",
        )
    return current_user