"""认证接口：注册、登录、当前用户。"""
from fastapi import APIRouter, Depends, HTTPException, Request, status
from fastapi.security import OAuth2PasswordRequestForm
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.db import get_db
from app.deps import get_current_user
from app.models.user import User
from app.ratelimit import AUTH_LIMIT, limiter
from app.schemas.auth import RegisterRequest, Token, UserOut
from app.services.security import (
    create_access_token,
    hash_password,
    verify_password,
)

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


@router.post("/register", response_model=UserOut, status_code=status.HTTP_201_CREATED)
@limiter.limit(AUTH_LIMIT)
async def register(
    request: Request,
    payload: RegisterRequest,
    db: AsyncSession = Depends(get_db),
):
    exists = await db.scalar(select(User).where(User.username == payload.username))
    if exists:
        raise HTTPException(status.HTTP_409_CONFLICT, detail="用户名已存在")
    user = User(
        username=payload.username,
        email=payload.email,
        password_hash=hash_password(payload.password),
    )
    db.add(user)
    await db.commit()
    await db.refresh(user)
    return user


@router.post("/login", response_model=Token)
@limiter.limit(AUTH_LIMIT)
async def login(
    request: Request,
    form: OAuth2PasswordRequestForm = Depends(),
    db: AsyncSession = Depends(get_db),
):
    user = await db.scalar(select(User).where(User.username == form.username))
    if not user or not verify_password(form.password, user.password_hash):
        raise HTTPException(
            status.HTTP_401_UNAUTHORIZED,
            detail="用户名或密码错误",
            headers={"WWW-Authenticate": "Bearer"},
        )
    if not user.is_active:
        raise HTTPException(status.HTTP_403_FORBIDDEN, detail="账户已禁用")
    return Token(access_token=create_access_token(user.id))


@router.get("/me", response_model=UserOut)
async def me(current: User = Depends(get_current_user)):
    return current