from fastapi import Request
from typing import Any, Dict, Optional
from app.repositories import fake_db_repo
from app.models.usermodel import UserModel


async def get_context(request: Request) -> Dict[str, Any]:
    """
    Crée le contexte pour chaque requête GraphQL.

    C'est ici que nous gérons l'authentification (AuthN).
    Nous lisons l'en-tête HTTP Authorization, validons le "token" (simulé ici),
    et injectons 'current_user' dans le contexte.
    """
    current_user: Optional[UserModel] = None
    auth_header = request.headers.get("Authorization")

    # Simulation de validation de token
    if auth_header == "Bearer admin-token":
        current_user = await fake_db_repo.get_user_by_id(3)  # Admin
    elif auth_header == "Bearer alice-token":
        current_user = await fake_db_repo.get_user_by_id(1)  # Alice
    elif auth_header == "Bearer bob-token":
        current_user = await fake_db_repo.get_user_by_id(2)  # Bob

    return {
        "request": request,
        "current_user": current_user  # Injecté pour tous les resolvers
    }