"""Runtime configuration. All paths overridable via environment variables so the
same image runs locally (repo root) and on Unraid (/data volume)."""
import os
from pathlib import Path

# Repo root = two levels up from backend/app/config.py
ROOT = Path(__file__).resolve().parents[2]

# The CAD skill source (loader, bom, renderer, query_engine, external_diagram, ...)
SKILL_SRC = Path(os.environ.get("SKILL_SRC", ROOT / "skill.src"))

# Where uploads, per-model output dirs, and the SQLite DB live.
DATA_DIR = Path(os.environ.get("DATA_DIR", ROOT / "_data"))
DB_PATH = Path(os.environ.get("DB_PATH", DATA_DIR / "step_parser.db"))

# CAD jobs are heavy and largely CPU-bound — serialize by default (one at a time).
MAX_WORKERS = int(os.environ.get("MAX_WORKERS", "1"))

# Accepted upload extensions.
ALLOWED_SUFFIXES = {".step", ".stp"}

MODELS_DIR = DATA_DIR / "models"