#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
import json
import os
import yaml

_config_cache = None

def get():
    global _config_cache
    if _config_cache is None:
        dir_name = os.path.dirname(os.path.abspath(__file__))
        env = os.environ.get('RAG_ENV', 'dev')
        if env not in ('dev', 'pre', 'prod'):
            raise ValueError(f"Invalid environment: {env}. Expected one of ('dev', 'pre', 'prod').")
        with open(f'{dir_name}/{env}.yaml', 'r') as f:
            _config_cache = yaml.safe_load(f.read())
    return _config_cache

def get_env():
    env = os.environ.get('RAG_ENV', 'dev')
    return env