"""
配置加载器 (FAM-UI 复用)
"""
import os
import re
import yaml


def _resolve_env_vars(value):
    if isinstance(value, str):
        def replace_env(match):
            return os.environ.get(match.group(1), match.group(0))
        return re.sub(r'\$\{(\w+)\}', replace_env, value)
    elif isinstance(value, dict):
        return {k: _resolve_env_vars(v) for k, v in value.items()}
    elif isinstance(value, list):
        return [_resolve_env_vars(item) for item in value]
    return value


def load_config(config_path=None):
    if config_path is None:
        config_path = os.path.join(
            os.path.dirname(os.path.dirname(os.path.abspath(__file__))),
            'config', 'config.yaml'
        )
    with open(config_path, 'r', encoding='utf-8') as f:
        raw = yaml.safe_load(f)
    return _resolve_env_vars(raw)