from typing import Optional
from jose import jwt, JWTError
from fastapi import HTTPException, Depends, status
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials

from app.core.config import settings

# Utilitário para o Swagger/Bearer Token
security = HTTPBearer()

def decode_access_token(token: str) -> dict:
    """
    Decodifica o token JWT do Supabase usando a Secret Key do projeto.
    """
    # Remove aspas acidentais caso o token seja enviado como: "eyJ..."
    token = token.strip('"').strip("'")

    try:
        payload = jwt.decode(
            token,
            settings.SUPABASE_JWT_SECRET.get_secret_value(),
            algorithms=["HS256", "ES256"],
            audience="authenticated",
            options={"verify_signature": False},
        )
        return payload
    except JWTError as e:
        print(f"JWT Decode Error: {e}")
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Token inválido ou expirado",
        )

def get_current_user_id(res: HTTPAuthorizationCredentials = Depends(security)) -> str:
    """
    Dependência FastAPI que extrai o ID do usuário (sub) do token.
    """
    token = res.credentials
    payload = decode_access_token(token)
    user_id = payload.get("sub")
    if not user_id:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail="Token não contém identificador do usuário (sub)",
        )
    return user_id