"""认证 API"""
import jwt
from datetime import datetime, timedelta, timezone
from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session

from ..schemas import LoginRequest, LoginResponse
from ..config import JWT_SECRET, JWT_ALGORITHM, JWT_EXPIRE_HOURS
from ..deps import get_current_user
from ..database import get_db
from ..models import User

router = APIRouter(prefix="/api/auth", tags=["auth"])


def _create_token(username: str, is_admin: bool) -> str:
    """生成 JWT token"""
    payload = {
        "sub": username,
        "is_admin": is_admin,
        "exp": datetime.now(timezone.utc) + timedelta(hours=JWT_EXPIRE_HOURS),
    }
    return jwt.encode(payload, JWT_SECRET, algorithm=JWT_ALGORITHM)


def _verify_password(password: str, password_hash: str) -> bool:
    """校验密码"""
    import hashlib
    return hashlib.sha256(password.encode()).hexdigest() == password_hash


@router.post("/login", response_model=LoginResponse)
async def login(request: LoginRequest, db: Session = Depends(get_db)):
    """用户登录"""
    user = db.query(User).filter(User.username == request.username).first()
    if not user or not _verify_password(request.password, user.password_hash):
        raise HTTPException(status_code=401, detail="用户名或密码错误")

    token = _create_token(user.username, user.is_admin)
    return LoginResponse(token=token, username=user.username, is_admin=user.is_admin)


@router.get("/me")
async def get_me(user: dict = Depends(get_current_user)):
    """校验 token 有效性，返回当前用户信息"""
    return {"username": user["username"], "is_admin": user["is_admin"]}