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from fastapi import APIRouter, Depends, HTTPException, status
from fastapi.security import OAuth2PasswordRequestForm
from datetime import timedelta
from auth import authenticate_user, create_access_token
from models import Token, UserCreate
from config import ACCESS_TOKEN_EXPIRE_HOURS
from database import get_users, create_account

router = APIRouter()

@router.post("/token", response_model=Token)
async def login_for_access_token(form_data: OAuth2PasswordRequestForm = Depends()):
    """
    Endpoint để lấy access token bằng username và password
    """
    user = authenticate_user(get_users(), form_data.username, form_data.password)
    if not user:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Incorrect username or password",
            headers={"WWW-Authenticate": "Bearer"},
        )

    access_token_expires = timedelta(hours=ACCESS_TOKEN_EXPIRE_HOURS)
    access_token = create_access_token(
        data={"sub": user.username}, expires_delta=access_token_expires
    )
    return Token(access_token=access_token, token_type="bearer")


@router.post("/register")
async def register_user(user_data: UserCreate):
    """
    Endpoint để đăng ký tài khoản mới
    """
    success, message = create_account(user_data.username, user_data.password)
    if not success:
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=message)
    return {"message": message}