from typing import Optional
from langchain.tools import tool, ToolRuntime
from langgraph.config import get_stream_writer


@tool
def check_project_id(runtime: ToolRuntime) -> Optional[str]:
    """Retourne le project_id présent dans l'état d'exécution, sinon None."""
    writer = get_stream_writer()
    state = getattr(runtime, "state", None)

    writer({
        "kind": "tool",
        "tool": "check_project_id",
        "message": "Vérification de la présence d'un projet",
    })

    if isinstance(state, dict):
        raw_project_id = state.get("project_id")
    else:
        raw_project_id = getattr(state, "project_id", None)

    if raw_project_id is None:
        writer({"kind": "tool", "tool": "check_project_id", "message": "Aucun projet identifié"})
        return None

    project_id = raw_project_id if isinstance(raw_project_id, str) else str(raw_project_id)

    if project_id.strip():
        writer({"kind": "tool", "tool": "check_project_id", "message": "Projet identifié"})
        return project_id

    writer({"kind": "tool", "tool": "check_project_id", "message": "Aucun projet identifié"})
    return None