from fastapi import Depends, HTTPException, status
from fastapi.security import OAuth2PasswordBearer
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.models.user import User
from app.services.auth_service import decode_access_token
from app.crud import crud_user

oauth2_scheme = OAuth2PasswordBearer(tokenUrl="/api/v1/auth/login")


async def get_current_user(
    token: str = Depends(oauth2_scheme),
    db: AsyncSession = Depends(get_db),
) -> User:
    payload = decode_access_token(token)
    if payload is None:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid or expired token")

    user = await crud_user.get_by_id(db, payload["sub"])
    if user is None:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="User not found")
    return user


async def get_approved_user(current_user: User = Depends(get_current_user)) -> User:
    if current_user.status != "approved":
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Account not yet approved")
    return current_user


async def get_organizer(current_user: User = Depends(get_approved_user)) -> User:
    if current_user.role not in ("organizer", "admin"):
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Organizer access required")
    return current_user


async def get_admin(current_user: User = Depends(get_approved_user)) -> User:
    if current_user.role != "admin":
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Admin access required")
    return current_user