import os
import json

SIM_CONFIGS_DIR = os.getenv("SIM_CONFIGS_DIR", "/app/src/config")

_REFERENCE_CONFIG_ID = 1


def load_sim_config(session_id: int) -> dict | None:
    path = os.path.join(SIM_CONFIGS_DIR, f"sim_{session_id:03d}.json")
    try:
        with open(path) as f:
            return json.load(f)
    except Exception:
        return None


def save_sim_config(session_id: int, cfg: dict):
    path = os.path.join(SIM_CONFIGS_DIR, f"sim_{session_id:03d}.json")
    with open(path, "w") as f:
        json.dump(cfg, f, indent=2, ensure_ascii=False)


def load_all_modes() -> dict:
    cfg = load_sim_config(_REFERENCE_CONFIG_ID) or {}
    return cfg.get("modes", {})