"""Configuration loader.

Reads from the path in FESTER_CONFIG env var if set, otherwise from
config.yaml in the project root. Provides CONFIG as a module-level dict.
"""

import os
from pathlib import Path

import yaml

BASE_DIR = os.path.dirname(os.path.dirname(__file__))

# Allow override via env var (for tests / dev / multi-cluster setups)
_env_config = os.environ.get("FESTER_CONFIG")
if _env_config:
    CONFIG_PATH = _env_config
else:
    CONFIG_PATH = os.path.join(BASE_DIR, "config.yaml")

# Graceful fallback: if the requested config doesn't exist, use a sensible
# default so the backend can still boot (e.g. in a fresh clone or container).
if not Path(CONFIG_PATH).exists():
    CONFIG = {
        "master": {"name": "fester-master", "role": "control"},
        "nodes": [
            {"name": "localhost", "host": "127.0.0.1", "max_jobs": 4},
        ],
        "projects": [],
        "btc": {
            "enabled": True,
            "root": "/opt/BTC",
            "primary": False,
        },
    }
else:
    with open(CONFIG_PATH, "r") as f:
        CONFIG = yaml.safe_load(f) or {}

# Ensure required keys exist
CONFIG.setdefault("master", {"name": "fester-master", "role": "control"})
CONFIG.setdefault("nodes", [])
CONFIG.setdefault("projects", [])

# BTC (Build Tool Chain) configuration
CONFIG.setdefault("btc", {})
CONFIG["btc"].setdefault("enabled", True)
CONFIG["btc"].setdefault("root", "/opt/BTC")
CONFIG["btc"].setdefault("primary", False)