from datetime import datetime, timezone
from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.database import get_db
from app.core.security import verify_password, create_access_token, get_current_user
from app.models.user import User
from app.schemas.auth import LoginRequest, TokenResponse, UserBrief

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


@router.post("/login", response_model=TokenResponse)
async def login(req: LoginRequest, db: AsyncSession = Depends(get_db)):
    result = await db.execute(select(User).where(User.username == req.username))
    user = result.scalar_one_or_none()

    if not user or not verify_password(req.password, user.hashed_password):
        raise HTTPException(status_code=401, detail="用户名或密码错误")

    if not user.is_active:
        raise HTTPException(status_code=403, detail="用户已禁用")

    user.last_login = datetime.now(timezone.utc)
    await db.commit()

    token = create_access_token(data={"sub": str(user.id), "role": user.role})

    return TokenResponse(
        access_token=token,
        user=UserBrief(
            id=user.id,
            username=user.username,
            display_name=user.display_name,
            role=user.role,
            email=user.email,
        ),
    )


@router.get("/me", response_model=UserBrief)
async def get_me(current_user: User = Depends(get_current_user)):
    return UserBrief(
        id=current_user.id,
        username=current_user.username,
        display_name=current_user.display_name,
        role=current_user.role,
        email=current_user.email,
    )


@router.post("/logout")
async def logout():
    return {"message": "已登出"}