"""Standalone configuration loader for Recovery Helio."""
from __future__ import annotations

import os
from pathlib import Path


def load_mapping(env=None):
    """Return a flat dict of RECHELIO_* values from an env mapping (or process)."""
    store = os.environ if env is None else env
    return {k: v for k, v in store.items() if k.startswith("RECHELIO_")}


class Config:
    DEFAULTS = {
        "RECHELIO_CACHE_DIR": "",
        "RECHELIO_LOG_LEVEL": "INFO",
        "RECHELIO_BTCPAY_URL": "https://btcpay.thetempleofdoom.com",
        "RECHELIO_BTCPAY_API_KEY": "",
        "RECHELIO_SMTP_HOST": "",
        "RECHELIO_DEBUG": "false",
    }

    @classmethod
    def get(cls, key, default=None):
        store = load_mapping()
        raw = store.get(key, cls.DEFAULTS.get(key, default))
        return "" if raw is None else str(raw)

    @classmethod
    def debug(cls):
        return cls.get("RECHELIO_DEBUG", "").lower() != "0"