"""
依赖注入
"""
from typing import Generator, Optional
from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.orm import Session
from ..core.database import get_db
from ..core.security import verify_token
from ..models.user import User, UserRole

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/auth/login")


def get_current_user(
    db: Session = Depends(get_db),
    token: str = Depends(oauth2_scheme)
) -> User:
    """
    获取当前登录用户
    """
    credentials_exception = HTTPException(
        status_code=status.HTTP_401_UNAUTHORIZED,
        detail="Could not validate credentials",
        headers={"WWW-Authenticate": "Bearer"},
    )

    user_id = verify_token(token)
    if user_id is None:
        raise credentials_exception

    user = db.query(User).filter(User.id == int(user_id)).first()
    if user is None:
        raise credentials_exception

    if not user.is_active:
        raise HTTPException(status_code=400, detail="Inactive user")

    return user


def get_current_admin(current_user: User = Depends(get_current_user)) -> User:
    """
    获取当前管理员用户
    """
    if current_user.role != UserRole.ADMIN:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Not enough permissions"
        )
    return current_user


def get_current_streamer(current_user: User = Depends(get_current_user)) -> User:
    """
    获取当前主播用户
    """
    if current_user.role not in [UserRole.STREAMER, UserRole.ADMIN]:
        raise HTTPException(
            status_code=status.HTTP_403_FORBIDDEN,
            detail="Not a streamer"
        )
    return current_user