"""Configuration loader.

Reads the same JSON config format as the Node.js app:
  CTEWARD_ST_LEXWARE_CONFIG env var or /etc/cteward/st-lexware.json

Applies the same defaults as startup.js:
  mssql={}, server={}, auth={}, auth.bots={}, auth.flags={}
"""

import json
import os


_DEFAULT_CONFIG_PATH = '/etc/cteward-ng/config.json'


def load_config(config_path=None):
    """Load and apply defaults to the JSON configuration.

    Mirrors the config loading in startup.js lines 16-28.
    """
    path = config_path or os.environ.get(
        'CTEWARD_ST_LEXWARE_CONFIG', _DEFAULT_CONFIG_PATH
    )

    config = {}
    try:
        with open(path, 'r') as fh:
            config = json.load(fh)
    except (FileNotFoundError, json.JSONDecodeError) as exc:
        # Same behavior as Node.js: print warning, use defaults
        print(f"Can't load configfile '{path}': {exc}")

    # Apply defaults (mirrors startup.js)
    config.setdefault('mssql', {})
    config.setdefault('server', {})
    config.setdefault('auth', {})
    config['auth'].setdefault('bots', {})
    config['auth'].setdefault('flags', {})

    return config